CN106338706B

CN106338706B - A kind of methods, devices and systems of electric energy metering device global error detection

Info

Publication number: CN106338706B
Application number: CN201510406622.9A
Authority: CN
Inventors: 侯飞
Original assignee: Individual
Current assignee: Individual
Priority date: 2015-07-10
Filing date: 2015-07-10
Publication date: 2019-09-24
Anticipated expiration: 2035-07-10
Also published as: CN106338706A

Abstract

The present invention is suitable for electrical energy measurement field, provides a kind of methods, devices and systems of electric energy metering device error self checking, which comprises the error criterion device of at least one known universe error amount is accessed in the examining system；The error criterion device includes electric energy computation chip and its circuit, voltage sensor and current sensor；Each electric energy metering device and the error criterion device measure and record respective energy data according to predetermined manner, and are reported to data processor；Global error that the energy data of the Error Calculator based on the received, by data processing calculates each electric energy metering device, being considered according to load current segmentation.The embodiment of the present invention realizes the self checking of electric energy metering device global error, overcoming cannot be detected with solving global error in the prior art in the prior art, must have a power failure could on-site test metering device current transformer and voltage transformer error, and with metering device quantity too greatly can not in accordance with the law according to rule detect the problem of.

Description

Method, device and system for detecting integral error of electric energy metering device

Technical Field

The invention belongs to the field of electric energy metering, and particularly relates to a method, a device and a system for detecting the integral error of an electric energy metering device.

Background

It is difficult for the electric energy metering device in use to determine whether the metering error is out of tolerance. Mainly because: firstly, an electric energy metering device is generally formed by three components, namely a current transformer, a voltage transformer and an electric energy meter. The error of the device is a comprehensive error calculated by the measuring accuracy of the three components. The comprehensive error has the use defects that: it is not, but not directly measurable. More seriously, the real overall error of the electric energy metering device is likely to be larger than the comprehensive error of the electric energy metering device and is not easy to measure. And secondly, the field calibration of errors of the current transformer and the voltage transformer must be carried out by power failure, so that inconvenience is brought to users, and power supply loss is caused. And thirdly, the error field calibration of the three components of the electric energy metering device consumes working hours, and because hundreds of millions of electric energy metering devices are installed in China, the field calibration work of the errors of all the metering devices cannot be completed according to the regulations by manpower and material resources of each power supply company.

At present, the remote automatic meter reading technology of the intelligent electric meter is mature and is popularized and opened worldwide. If the method can get rid of the dependence on the use of external standard instruments, only reads the electric energy data of the cluster electric energy meters, performs calculation and analysis, and calculates the overall error of each electric energy metering device, the real error of the electric energy metering device can be correctly judged, the operation and maintenance cost of the electric energy meters in use can be reduced, and the legal interests of both electric energy suppliers and consumers can be protected.

In the article "autonomous error algorithm of smart meter cluster" of 9 th month and 5 th month in the journal of metrology 2011, a method for extracting a relative error of each electric energy meter by analyzing and mining only a reading database of the electric energy meter cluster is mentioned. However, the method of the paper is based on the analysis conclusion made under the assumed application environment, which only discusses the problem of average error of the low-voltage electric energy meter, and cannot be applied to the overall error self-check of the real electric energy metering device. The statistical value of the electric energy meter is calculated comprehensively, only the average error value of the electric energy meter can be obtained, the average error value has no any significance in the technical and practical application values, and the method even can cause that the quality of the electric energy meter is judged by mistake. In fact, it is not practical to merely correct the measurement error of the electric energy meter, because it is not the error of the electric energy meter but the overall error of the electric energy metering device that determines whether the electric energy metering is accurate.

Disclosure of Invention

The embodiment of the invention aims to provide a method and a device for automatically checking errors of an electric energy metering device. The method and the device solve the problems that the whole error cannot be detected, the errors of the current transformer and the voltage transformer of the metering device can be detected on site only by power failure in the prior art, and the metering device cannot be used for legal and regulatory detection when the number of the metering devices is too large. And improves the usability and accuracy of the overall error detection value.

The embodiment of the invention is realized in such a way that an error standard device with a known integral error value is accessed into a system to be tested, each electric energy metering device measures electric energy data of a line where the electric energy metering device is located and reports the electric energy data to an error processor for data processing, and then the electric energy data is sent to an error calculator for calculating the integral error of each electric energy metering device according to sectional consideration of load current, and the method comprises the following steps:

the system to be tested is a non-energy-consumption system, and the sum of the electric energy flowing through the incoming electric energy metering devices in the system to be tested is equal to the sum of the electric energy flowing through the outgoing electric energy metering devices in the system to be tested; accessing an error standard device with a known overall error value in the system to be tested; the error standard device comprises an electric energy metering chip and a circuit thereof, a voltage sensor and a current sensor; the electric energy metering chip and the circuit thereof, the voltage sensor and the current sensor are shielded so as to reduce the influence of electromagnetic interference to a preset threshold value; the electric energy metering devices and the error standard device measure and record respective electric energy data according to a preset mode, and report the electric energy data to the data processor; the error calculator calculates the overall error of each electric energy metering device according to the load current sectional consideration according to the received electric energy data subjected to data processing.

Preferably, the method for accessing an error standard with a known overall error value to the system under test specifically includes:

connecting the error standard device in series or in parallel to a line where any electric energy metering device in the system to be tested is located; or, a new line is additionally arranged between the system to be tested and the electric load for the error standard device.

Preferably, the overall error is a real error of the electric energy metering device in the operating state, and specifically includes:

the method comprises the steps of calculating the error sum caused by the self-metering accuracy of an electric energy metering chip and a circuit thereof, a current transformer and a voltage transformer, and the error sum caused by other influencing factors; wherein, the sum of errors caused by other influencing factors comprises: the error caused by the influence of the electromagnetic environment of the three parts on the self and the error caused by the mutual interference of the three parts.

Preferably, the electric energy metering device measures and records respective electric energy data, and specifically includes:

determining the load current segment to which the electric energy data belongs according to the measured electric energy data and the load current value; and searching the position corresponding to the load current segment in the storage area to finish recording and storing.

Preferably, the error handler specifically includes:

the error calculator receives electric energy and related current data from the electric energy metering device and the error standard device, and determines and classifies the load current segment to which the electric energy data belongs according to the current data; storing the electric energy data which are classified and processed according to the load current; the stored power data is transmitted to a designated error calculator or a designated object.

Preferably, the error processor includes an electric energy metering device for measuring the electric energy data, another electric energy metering device in the system to be measured, an error standard device or an error calculator.

Preferably, the error calculator calculates the overall error of each electric energy metering device, which is considered in a segmented manner according to the load current, according to the received electric energy data subjected to data processing, and specifically includes:

according to the fact that electric energy data recorded by an incoming line electric energy metering device and an outgoing line electric energy metering device in the system to be tested meet an electric energy conservation principle, the electric energy data recorded by the incoming line electric energy metering device and the electric energy data recorded by the outgoing line electric energy metering device in a specified time are combined with error value variables of the incoming line electric energy metering device and the outgoing line electric energy metering device under the load current segmentation respectively to construct an energy balance equation, and N equations can be formed and form an equation set by reading the electric energy data of the system to be tested for N times, wherein N is a natural number; the energy balance equation set comprises error value variables of each electric energy metering device in each load current segment; the error calculator acquires the stored electric energy data of each electric energy metering device in the corresponding load current section; and the electric energy data is segmented according to the corresponding load current, substituted into an energy balance equation set to serve as a coefficient of a corresponding error value variable, and the energy balance equation set is solved by using the known error of an error standard device to obtain the error value of each electric energy metering device in each load current segment.

Preferably, the preset mode specifically includes:

setting each electric energy metering device in the system to be tested to segment according to the designated time and the load current, measuring and recording respective electric energy data, classifying, distinguishing, storing and reporting to an error calculator according to the load current segments; or setting each electric energy metering device in the system to be tested to measure and record respective electric energy data and current data according to the designated time, and reporting the electric energy data and the current data to the error calculator for processing.

On the other hand, an embodiment of the present invention provides a device for detecting an overall error of an electric energy metering device, where the device includes a data transceiver unit, a storage unit, and a processing module, and specifically includes:

the data transceiver unit is used for receiving electric energy data reported by each electric energy metering device and an error standard device with known integral error value in a system to be tested, and sending various electric energy and related data;

the storage unit is used for storing various electric energy and related data;

the processing module is used for analyzing the electric energy data reported by each electric energy metering device, determining the load current segment to which the electric energy data belongs, and storing the electric energy data into the storage unit according to the corresponding relation among the electric energy metering device identifier or the error standard device identifier, the load current segment and the electric energy data; the processing module is further used for calculating the overall error of each electric energy metering device according to the corresponding relation among the electric energy metering device identification or the error standard device identification, the load current subsection and the electric energy data.

Preferably, the device is specifically an electric energy metering device, and is further used for measuring and storing electric energy data and related data of a line where the device is located; and/or the device is specifically an error calculator and processes data of the device and data of a related electric energy metering device; and/or the device is specifically an error calculator and is used for calculating the integral error of the device per se according to the load current section.

On the other hand, the embodiment of the invention provides a system for self-checking the overall error of the electric energy metering devices, wherein an error standard device with a known overall error value is connected into a system to be tested, and each electric energy metering device measures the electric energy data of the line where the electric energy metering device is located and reports the electric energy data to an error processor to calculate the error of each electric energy metering device;

the system to be tested is a non-energy-consumption system, and the sum of electric energy flowing through the incoming electric energy metering devices in the system to be tested is equal to the sum of electric energy flowing through the outgoing electric energy metering devices in the system to be tested; the error standard device with known overall error is connected to the system to be tested and comprises an electric energy meter, a voltage transformer and a current transformer; wherein the electric energy meter, the voltage sensor and the current sensor are installed in a housing having a function of shielding external electromagnetic interference; the integral error is caused by the self metering accuracy of the electric energy meter, the current transformer and the voltage transformer, and also comprises an error caused by an influence factor; wherein, the error caused by the influence factor comprises: errors caused by the influence of the environment where the three are located and errors caused by mutual interference among the electric energy meter, the current transformer and the voltage transformer;

in the system to be measured, each electric energy metering device and an error standard device measure electric energy data of respective line according to a preset mode and report the electric energy data to an error processor for data processing and integral error calculation, the electric energy metering device comprises an incoming line electric energy metering device and an outgoing line electric energy metering device, the measured data comprises the electric energy data of the line where the electric energy metering device is located and corresponding load current segments, and the data processing and integral error calculation comprise the measured data of each electric energy metering device and the processed data of the error processor and the error calculation; the error processor processes the data and calculates the error, including processing the data and calculating the error, wherein the calculating the error includes an overall error for different load current segments.

In another aspect, an embodiment of the present invention further provides a data processing method for error self-checking of an electric energy metering device, where each electric energy metering device in a system to be tested stores respective load current segment distribution information, and the method includes:

the electric energy metering device B records electric energy data of a line where the electric energy metering device B is located according to a preset mode; the method comprises the steps of calling self-stored load current subsection distribution information, analyzing to obtain a load current subsection to which recorded electric energy data belongs, and storing the recorded electric energy data into a storage area identified by a corresponding load current subsection; and sending the electric energy data recorded once or for many times stored in the storage area to an error processor so that the error processor can calculate the overall error of each electric energy metering device in the system to be measured.

Optionally, the electric energy metering device B further has an ability to calculate an overall error, and the method further includes:

the electric energy metering device B receives an instruction for calculating the overall error sent by the error processor, wherein the instruction carries electric energy data acquired by the error processor and reported by each electric energy metering device in the whole system to be tested; the electric energy metering device B calculates the self integral error according to the electric energy data carried in the instruction for calculating the integral error; and the electric energy metering device B sends the calculated self integral error to the error processor.

Preferably, the electric energy metering device B calculates the total error of itself according to the electric energy data carried in the instruction for calculating the total error, and specifically includes:

the electric energy data carried in the instruction for calculating the overall error comprises electric energy data recorded by the incoming line electric energy metering device, the outgoing line electric energy metering device and the error standard device; according to the fact that the electric energy data recorded by an incoming electric energy metering device and an outgoing electric energy metering device meet the principle of electric energy conservation, the electric energy data recorded by the incoming electric energy metering device and the electric energy data recorded by the outgoing electric energy metering device in a specified time are combined with error value variables of the incoming electric energy metering device and the outgoing electric energy metering device under the load current segmentation respectively to construct an energy balance equation set, N equations can be formed by reading the electric energy data of a system to be tested for N times, and the equation set is formed, wherein N is a natural number; the energy balance equation set comprises error value variables of each electric energy metering device in each load current segment; acquiring electric energy data stored in corresponding load current segments by each electric energy metering device; and the electric energy data is segmented according to the corresponding load current, substituted into an energy balance equation set to serve as a coefficient of a corresponding error value variable, and the energy balance equation set is solved by using the known error of an error standard device to obtain the error value of each electric energy metering device in each load current segment.

The method and the device for self-checking the error of the electric energy metering device have the advantages that: the self-checking method and the self-checking device realize the self-checking of the whole error of the electric energy metering device, and overcome the problems that the whole error cannot be detected in the prior art, the errors of the current transformer and the voltage transformer of the metering device can be detected on site only by power failure, and the metering device cannot be used for legal and standard detection if the number of the metering devices is too large. In addition, in the preferred scheme, the error of the electric energy metering device has a certain relation with the load size of the electric energy metering device, electric energy data meeting conditions are extracted according to different loads of a line where the metering device is located, and the overall error value of the metering device is calculated in a segmented mode according to the load size. The reliability of the overall error detection value is improved.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the embodiments or the description of the prior art will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.

Fig. 1 is a schematic flow chart of a method for self-checking an overall error of an electric energy metering device according to an embodiment of the present invention;

FIG. 2 is a block diagram of a system under test including an electric energy metering device according to an embodiment of the present invention;

FIG. 3 is a diagram illustrating an error relationship of a prior art electric energy metering device according to an embodiment of the present invention;

FIG. 4 is an error relationship diagram of a self-made electric energy metering device according to an embodiment of the present invention;

fig. 5 is a schematic flow chart of power data preprocessing according to an embodiment of the present invention;

FIG. 6 is a schematic diagram of an electrical energy data storage relationship provided by an embodiment of the present invention;

FIG. 7 is a schematic diagram of an electrical energy data storage relationship provided by an embodiment of the present invention;

FIG. 8 is a schematic diagram of an electrical energy data storage relationship provided by an embodiment of the present invention;

fig. 9 is a schematic flow chart illustrating an overall error self-checking calculation of the electric energy metering device according to the embodiment of the present invention;

fig. 10 is a schematic flow chart of power data preprocessing according to an embodiment of the present invention;

fig. 11 is a schematic structural diagram of an apparatus for self-checking an overall error of an electric energy metering apparatus according to an embodiment of the present invention;

fig. 12 is a schematic structural diagram of an electric energy metering device according to an embodiment of the present invention;

fig. 13 is a schematic flowchart of a method for self-checking an overall error of an electric energy metering device according to an embodiment of the present invention;

fig. 14 is a schematic flow chart illustrating a method for manufacturing an electric energy metering device according to an embodiment of the present invention;

fig. 15 is a schematic flowchart of a method for self-checking an overall error of an electric energy metering device according to an embodiment of the present invention;

fig. 16 is a schematic diagram illustrating a processing flow of electric energy data of an electric energy metering device according to an embodiment of the present invention;

fig. 17 is a schematic diagram of an electric energy data processing flow of an electric energy metering device according to an embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

In order to explain the technical means of the present invention, the following description will be given by way of specific examples.

In the embodiments of the present invention, for example, the electric energy metering device a and the electric energy metering device B are presented, where the letter A, B is merely for convenience of description, and no particular limitation is imposed on the function thereof. In the embodiment of the present invention, the electric energy metering device a may be any one of the electric energy metering devices in the system under test.

Example 1:

the embodiment of the invention provides an error self-checking method for an electric energy metering device, wherein a system to be tested applicable to the error self-checking method is a non-energy-consuming system, the sum of electric energy flowing through an incoming electric energy metering device in the system to be tested is equal to the sum of electric energy flowing through an outgoing electric energy metering device in the system to be tested, and as shown in figure 1, the method comprises the following steps:

in step 201, an error standard with a known overall error value is accessed into the system under test.

The error standard device comprises an electric energy metering chip and a circuit thereof, a voltage sensor and a current sensor; the electric energy metering chip and the circuit thereof, the voltage sensor and the current sensor are shielded so as to reduce the influence of electromagnetic interference to be within a preset threshold value. The preset threshold value ensures that its electromagnetic interference has a sufficiently small influence on the metering error, for example: the threshold is one in ten thousandth. The electric energy metering chip and the circuit thereof can be an electronic circuit board for electric energy metering and can also be an electric energy meter, and similarly, the current transformer can also be realized by a current sensor, and the voltage transformer can be realized by a voltage sensor.

Wherein the overall error specifically includes: errors caused by the self metering accuracy of the electric energy metering chip and the circuit thereof, the current transformer and the voltage transformer also comprise errors caused by influence factors; wherein, the error caused by the influence factor comprises: the error caused by the influence of the environment where the three parts are located and the error caused by the mutual interference of the three parts. Theoretically, the total error of the electric energy metering device is a value which includes the real total error of the whole electric energy metering device after the influence of all known and unknown influencing factors. The whole error can only be measured actually in the prior art and cannot be calculated from errors of the electric energy meter and the sensor, and the invention provides a calculation method.

In step 202, the electric energy metering devices and the error standard measure and record respective electric energy data according to a preset mode, and report the electric energy data to the error calculator.

Each electric energy metering device comprises an incoming line electric energy metering device and an outgoing line electric energy metering device, electric energy is metered by the incoming line electric energy metering device and is transmitted to the outgoing line electric energy metering device for metering, and the total amount of the inflow electric energy metered by the incoming line electric energy metering device is equal to the total amount of the outflow electric energy metered by the outgoing line electric energy metering device. For example, M shown in FIG. 2₀I.e. the incoming electric energy metering device, and M₁,M₂,…,M_n-1Then is an outlet electric energy metering device, wherein M_XIs an error normalizer of a known overall error value accessed in step 201. The power data may include a current data value, a voltage data value, and/or a power value calculated from the current data value and the voltage data value.

In step 203, the error calculator calculates an overall error of each electric energy metering device, which is considered in a sectional manner according to the load current, based on the received data-processed electric energy data.

The error processor and the error calculator can be each electric energy metering device, one or more appointed electric energy metering devices, a centralized meter reading device, an information acquisition device, and a third-party device, equipment or a system inside and outside the system to be tested. The error processor for the data processing may or may not be the same device as the error processor for calculating the overall error.

According to the fact that the electric energy data recorded by the incoming line electric energy metering device and the outgoing line electric energy metering device in the system to be tested meet the electric energy conservation principle, the electric energy data recorded by the incoming line electric energy metering device and the electric energy data recorded by the outgoing line electric energy metering device in the specified time are combined with error value variables of the electric energy data and the electric energy data under the load current section respectively to construct an energy balance equation, and N equations can be formed by reading the electric energy data of the system to be tested for N times to form an equation set; the energy balance equation set comprises error value variables of each electric energy metering device under each load current section.

The embodiment of the invention realizes the self-checking of the error of the electric energy metering device, and overcomes the low checking efficiency caused by the special setting of the testing environment and the arrangement of a specific testing instrument in the prior art. And the problem that the average error result of the electric energy meter calculated in the prior art cannot be used in industrial error value evaluation is solved.

In connection with the present embodiment, a simple example is given to illustrate the difference between the overall error of the electric energy metering device and the error of the electric energy meter. In the prior art of the aforementioned thesis autonomous error algorithm of the smart meter cluster, the average error obtained by calculation is a metering error only for the low-voltage electric energy meter, and in industrial implementation, much more is high-voltage and high-current electric energy metering, and the electric energy metering can be performed by connecting the high-voltage transformer and the high-current transformer to the low-voltage electric energy meter through transformation and current transformation. This is because the nominal operating voltage and current of the electric energy meter cannot usually be too high. If, according to the prior art, only the error of the electric energy meter is considered, the electric energy metering work cannot be accurately completed. The method provided in the paper cannot be used in the actual industrial electric energy metering error test work.

In an embodiment of the present invention, the components of the electric energy metering device in the system under test include: electric energy meters, current transformers and voltage transformers, e.g. M in FIG. 3₀As shown. Wherein the electric energy meter and the current transformerThe voltage transformer can be installed in a housing capable of shielding external electromagnetic interference to ensure that the overall error of the voltage transformer is not changed due to the change of the place where the voltage transformer is placed (for example, the voltage transformer and the error standard have the same structure), or the electric energy meter and the current transformer and the voltage transformer are separately installed in different housings (for example, some products on the market exist, the electric energy meter does not comprise the current transformer and the voltage transformer, and the three are respectively purchased and installed together to complete the electric energy metering work, which is common in a high-voltage environment).

In this embodiment, the accessing manner of the error standard device accessing a known overall error value in the system under test specifically includes:

connecting the error standard device and any incoming line electric energy metering device or outgoing line electric energy metering device in the system to be tested in a series connection mode; alternatively, a line may be separately established for the error standard, and the line may be an incoming line or an outgoing line. That is, it is possible to have its own independent test line, and thereafter, it is possible to have its own electrical load. As shown in fig. 2, Mx can be considered to be connected in parallel, i.e., Mx has its own independent test line. The electricity utilization object behind the Mx may be an electricity utilization object simulated by the device, or may be an actually existing electricity utilization object newly added to the system to be tested for the electric energy metering device Mx.

If the former series connection mode is adopted, for example, the error standard device Mx and the electric energy metering device My in fig. 2 are connected in series, during calculation, the data of My only needs to be replaced by Mx to calculate the overall error value of each metering device in the system to be measured, wherein the overall error value of My can be calculated by comparing the electric energy metering value of Mx and the electric energy metering value of My received at the same time. Because, in the series connection mode of the error standard device Mx and the electric energy metering device My, the electric energy metering values obtained in the error standard device Mx and the electric energy metering device My are theoretically the same.

With reference to the embodiments of the present invention, the preset method specifically includes: setting each electric energy metering device in the system to be tested to record respective electric energy data according to a specified time interval, and reporting the electric energy data to an error processor; or setting each electric energy metering device in the system to be tested to record respective electric energy data according to a specified time interval, and reporting the electric energy data to the error processor after receiving the data reporting request message.

In the embodiment of the invention, the parameter with the designated time and period is involved, and the parameter value can be set by a worker. This example presents a preferred parameter scheme, specifically: the specified time is specifically 30 days; the time interval is in particular 30 minutes.

With reference to the embodiment of the present invention, before the performing, by the error processor, the obtaining of the stored electric energy data of each electric energy metering device in the system under test within the specified time, the method further includes:

receiving an error value analysis instruction; the error value analysis instruction is sent by an operator, or the error value analysis instruction is preset by the operator and triggered periodically so that the required error value calculated by the error processor can be obtained.

Example 2:

the overall error is described in example 1, and a method for solving the overall error of each electric energy metering device in the system to be tested is given by the method provided in example 1. This embodiment 2 is a clear definition around the difference between the overall error and the average error.

As shown in fig. 3, which is a schematic structural diagram of a conventional electric energy metering device, as described in embodiment 1, the electric energy metering device described in this embodiment is specifically an integral body formed by a current transformer, a voltage transformer and an electric energy meter. In the prior art, both current transformers and voltage transformers, usually of the same typeThe energy meter is produced and obtained by manufacturers as different devices, and errors can exist in all three devices in practical application. The errors of the three can be seen independently, the error epsilon of the voltage transformer_pt(ε_pt＝f_pt+jδ_pt) Error e of current transformer_ct(ε_ct＝f_ct+jδ_ct) Is a vector error, and the error of the electric energy meter is epsilon_mThe error of the three is scalar error, and an error value cannot be obtained through addition and subtraction operation. The industry can only give an estimated range, and it is desirable that the true error not exceed this range, which is known in the art as the composite error. However, this combined error is due to the error ε caused by the environmental effects of the three described in example 1_xAnd the error influence caused by mutual interference among the electric energy meter, the current transformer and the voltage transformer is variable and immeasurable.

The embodiment of the invention provides a concept of integral error. As shown in fig. 4, the embodiment of the present invention is based on providing an electric energy metering device, in which a current transformer, a voltage transformer and an electric energy meter are integrated together, and the three devices are protected by a housing having a function of shielding electromagnetic interference, so that an external error epsilon formed by environmental influence and influence caused by mutual interference among the three devices exists in the prior art_xThe error results are reduced to a sufficiently small range for the final calculation. Furthermore, in the production process, the error of the electric energy metering device provided by the invention is checked and compensated, and a function epsilon formed by error variables of the current transformer, the voltage transformer and the electric energy meter_m’＝f(ε_m,ε_x,ε_pt,ε_ct) The reduction in the function value of (c) is sufficiently small. This epsilon_mThe value of' is often the overall error value of the power metering device. In the embodiment of the invention, the reliable known error value is provided by using the error standard device of the shell with the electromagnetic interference shielding function, so that the integral error test of the electric energy metering device in the system to be tested becomes possible.

Therefore, an embodiment of the present invention provides a most preferable system under test, and specifically, all electric energy metering devices in the system under test adopt the electric energy metering device with the housing having the electromagnetic interference shielding function, where the electric energy metering device is integrated with a current transformer, a voltage transformer, and an electric energy meter.

Example 3:

in embodiment 1, a method for calculating the overall error of each electric energy metering device according to an error standard device connected to a known overall error value and further by combining electric energy data recorded and reported by each electric energy metering device in a system to be measured in a preset manner is described. To further enable those skilled in the art to understand how to calculate the overall error of each energy metering device according to the received energy data, the present embodiment provides a method of segment preprocessing according to load current, as shown in fig. 5, including:

in step 301, the error processor receives the electric energy data sent by the electric energy metering device a, performs screening according to the electric energy data, and determines a load current segment to which the electric energy data belongs.

In the first mode, the load current segment where the electric energy data is located may be calibrated by the electric energy metering device a when recording the electric energy data of itself. And when the electric energy data is sent to the error processor, the load current segmentation information of the electric energy data is carried in the sent message.

In another mode, the message sent by the electric energy metering device a does not carry load current segment information, that is, the electric energy metering device a only sends the electric energy data to the error processor, and the error processor analyzes the load current segment where the electric energy data reported by the error processor is located according to the corresponding electric energy metering device.

In step 302, the power data is stored in a storage area identified by power metering device a corresponding to the load current segment.

The corresponding power metering devices, load current segments, and corresponding power data stored in the error processor are shown in fig. 6, where the power data stored in each load current segment stores information related to the recording time (the power data is depicted as a whole block in fig. 6, and the corresponding relationship between the power data and the time is not shown). Fig. 7 shows a format manner of combining reporting time and electric energy data storage in the load current segment 1. An example of storing data in a table form is also given in the present embodiment, as shown in fig. 8. The data structure relationships shown in fig. 6, fig. 7 and fig. 8 in embodiment 2 of the present invention are only examples, and the protection scope of the embodiment of the present invention also includes other forms of storage modes related to the load current segment, the recording time and the power data.

Example 4:

in embodiment 3, how the error processor stores the electric energy data reported by the electric energy metering devices according to the relationship between the load current segments and the electric energy data is given, and next, embodiment 3 will focus on a specific implementation manner for the error processor in embodiment 1 to calculate the overall error of each electric energy metering device according to the received electric energy data. As shown in fig. 9, the method comprises the following steps:

in step 401, electric energy data recorded by an incoming electric energy metering device and an outgoing electric energy metering device in the system to be tested conforms to an electric energy conservation principle, and an energy balance equation set is constructed by combining the electric energy data recorded by the incoming electric energy metering device and the electric energy data recorded by the outgoing electric energy metering device within a specified time with respective error value variables under the load current segment; the energy balance equation set comprises error value variables of each electric energy metering device in each load current segment.

As shown in FIG. 2, assume that the power reading during the measurement period Ti flowing through the i-th power metering device is W_ij(i is 1,2, …, n-1 is serial number of electric energy metering device; j is 1,2, …, m is j-th load current segment), x_ijFor the integral error of the ith electric energy metering device in the jth current segment, the following formula holds according to the law of conservation of energy:

wherein x is_xjThe error of the error standard, which is a known error, in the j-th current segment is a known constant.

In step 402, the error processor obtains stored electric energy data W of each electric energy metering device in the corresponding load current segment_ij. When the number of batches is equal to k m, the number of equations in the equation set is equal to the number of integral errors after the electric energy metering device is segmented, and the equation set has a unique solution. The overall error data for each current segment of the respective electric energy metering device can be measured. And the error processor can refer to the mode shown in fig. 7 when storing the data, so that the electric energy data stored in the corresponding load current segment by each electric energy metering device in the specified time can be obtained, and the electric energy conforms to the energy conservation stated in the formula (1).

In step 403, the electric energy data is substituted into an energy balance equation set as a coefficient of a corresponding error value variable according to the corresponding load current segment, and the energy balance equation set is solved to obtain an error value of each electric energy metering device in each load current segment.

In connection with the present embodiment, assuming that the load current segment includes 1,2 and 3 levels in the present embodiment, i.e. m is 3, the error value x is_ijWill also showThree values are:

wherein x is_i,1Is M_iAn error value variable under the 1 st load current segment; x is the number of_i,2And x_i,3Are respectively M_iAn error value variable at the 2 nd load current segment and the 3 rd load current segment. Since the electric energy data reported by each electric energy metering device at the same time may include one or more of the 3 load current segments. This situation may occur depending on the frequency of the electric energy data recorded by each electric energy metering device and the frequency of the electric energy data reported by each electric energy metering device to the error processor, for example: each energy metering device records energy data once every 10 minutes, and the frequency of reporting the energy data is once every 30 minutes, when the error processor receives the energy data reported once by one energy metering device, the energy data comprises 3 recorded energy values, and the 3 recorded energy values are likely to correspond to more than one load current segment.

Therefore, the error processor also needs to do a round of stuffing before applying the stored power data to equations 1) and 2). The step of selecting the plug specifically comprises the steps of analyzing the recording times p contained in the stored electric energy data reported by each electric energy metering device at present; determining the number n of variables of an equation set formed by the error value variables of each electric energy metering device, and equally dividing the recording times into 3 x n groups of parameter values, wherein each group of parameter values comprises p/(3 x n) times of recording values; the p/(3 x n) times of recorded values in each group are accumulated corresponding to the load current which the recorded values belong to in a segmented manner, and the accumulated parameter values are substituted into an equation set to obtain the following equation set

Constructing k sets of parameter values from the electrical energy data selected by the plug, wherein each set of parameter values includes parameter values corresponding to three load current segments, e.g., [ (z)_{Formula (1, 1)},z_{Formula (II) 2,1},z_{Formula (II 1) 3,1}),(z_{Formula (1, 2)},z_{Formula (II 2, 2)},z_{Formula (II) 3,2}),…,(z_{Formula 1, k-1},z_{Formula 2, k-1},z_{Formula 3, k-1})]Belonging to one of the k sets of parameter values. After substituting into the 1 st order k-dimensional equation set, the following:

wherein z is_{Formula (1, 1)}、z_{Formula (II) 2,1}And z_{Formula (II 1) 3,1}Separate electric energy meter M₁In the reported electric energy data, in every p/(3 × n) times of recorded energy data, the accumulated sum of the electric energy data in the 1 st load current segment, the accumulated sum of the electric energy data in the 2 nd load current segment, and the accumulated sum of the electric energy data in the 3 rd load current segment.

Example 4:

embodiment 3 provides a method for acquiring, by an error processor, electric energy data stored in a corresponding load current segment by each electric energy metering device, and substituting the electric energy data into formulas 1) and 2) after completing accumulation to calculate an error value of each energy metering device on each load current segment. As shown in fig. 10, the present embodiment will be described in conjunction with specific electrical characteristics to how to complete the accumulation process, and in the present embodiment, it is the current value recorded by the electric energy metering device that is used for determining the load current segment.

In step 501, register M is set_i(i ═ 1,2,3) for storing the accumulated value of the electric energy amount of the 3 load current segments; a. the_i(i ═ 1,2,3) in which A is₁＝(1-10％)I_n，A₂＝(10-30％)I_n，A₃＝(30-120％)I_nIn which I_nIs a rated value for the operation of the electric energy metering device. Measuring a time period T_iDivided into a number of sampling time intervals △ t_i。

In step 502, at each time interval △ t_iAt the end, the effective value of the current I is recorded simultaneously_jiAnd electric energy meter data △ W_ji。

In step 503, the current I is determined_jiTo which a belongs_iInterval of (2), power data W_jiAnd a corresponding register M_iThe value of (A) is accumulated and stored in a corresponding register M_i。

In step 504, T_iAt the end, the accumulated data W is obtained in each register_jiThe jth electric energy metering device at T can be obtained_iPower data of the device

Correspondingly, the electric energy flowing on the jth line can be expressed as

Wherein x_jiAnd the integral error of the jth electric energy metering device under the ith load current segment is shown.

In step 505, using the formula

The electric energy metering error of the system with n electric energy metering devices can be calculated, and all that is needed is to complete the collection of 3 x n groups of data.

This embodiment is more efficient as an alternative to calculating the parameter set in embodiment 3. However, in this embodiment, the received power data needs to be accumulated in real time. Therefore, the error processor needs to clearly define the period of recording the electric energy data, the period of reporting the electric energy data and the period of calculating the overall error value by itself of each electric energy metering device, so as to effectively distinguish which electric energy data can be accumulated as one set of parameters and which data can be accumulated as another set of parameters (for example, one set described in embodiment 3 is divided into p/(3 × n) times of recording values).

Example 5:

embodiment 5 of the present invention provides an error self-checking device for an electric energy metering device, as shown in fig. 9, the device includes a data transceiver unit 10, a storage unit 11, and a processing module 12, specifically:

the data transceiver unit 10 is configured to receive power data reported by each power metering device and an error standard with a known overall error value in a system to be tested, and send various power and related data.

The storage unit 11 is used for storing various types of electric energy and related data.

The processing unit 12 is configured to analyze the electric energy data reported by each electric energy metering device, determine a load current segment to which the electric energy data belongs, and store the electric energy data in the storage unit 11 according to a correspondence relationship between an electric energy metering device identifier or an error standard device identifier, the load current segment, and the electric energy data; the processing unit 12 is further configured to calculate an overall error of each electric energy metering device according to a corresponding relationship among the electric energy metering device identifier or the error standard device identifier, the load current segment, and the electric energy data.

In order to further illustrate how the processing unit 12 calculates the overall error of each electric energy metering device according to the electric energy data in this embodiment, an implementation manner is provided in combination with this embodiment, wherein the processing unit 12 is further configured to, according to that the electric energy data recorded by the incoming electric energy metering device and the outgoing electric energy metering device satisfy an electric energy conservation principle, combine the electric energy data recorded by the incoming electric energy metering device and the electric energy data recorded by the outgoing electric energy metering device within a specified time with the error value variables of each of the electric energy metering devices under the load current segment, and construct an energy balance equation set; the energy balance equation set comprises error value variables of each electric energy metering device in each load current segment; acquiring electric energy data stored in corresponding load current segments by each electric energy metering device; and substituting the electric energy data into an energy balance equation set according to the corresponding load current subsection as a coefficient of a corresponding error value variable, substituting a known error value of an error standard device into the equation set, and solving the energy balance equation set to obtain the error value of each electric energy metering device in each load current subsection.

The embodiment of the invention realizes the self-checking of the error of the electric energy metering device, and overcomes the defect that the prior art needs to specially set a test environment and is underground with checking efficiency caused by the arrangement of a specific test instrument. And aiming at the fact that errors of the electric energy metering device have certain difference in different load current sections, electric energy data meeting calculation conditions are extracted on the basis of the load current sections, and the accuracy of calculation of the final error value is improved.

The device for error self-checking of the electric energy metering device provided by this embodiment is also used for implementing the methods described in embodiments 1 to 4, and is not repeated herein for the sake of simplifying the requirements of the specification of the application document.

Example 6:

embodiment 5 shows how the method described in embodiment 1 of the present invention is implemented by the processing unit 12, the data-transceiving unit 10, and the storage device 11. In order to further explain another device to be protected by the present invention in terms of physical products, i.e. an electric energy metering device with a known overall error, next, an embodiment of the device based on a specific product structure will be given in this embodiment 6. As shown in fig. 12, the device comprises a current sensor, a voltage sensor, a metering chip, a microcontroller, an infrared communication module, an RS485 communication module, a working power supply, a memory and a liquid crystal display.

And the current sensor and the voltage sensor are used for converting the current and the voltage which are higher than those of the electric energy metering device into the current and the voltage which can be recorded by the metering circuit board and the circuit thereof. The metering circuit board and the circuit thereof are used for receiving current and voltage signals transmitted by the current sensor and the voltage sensor and converting the current and voltage signals into current data and voltage data which can be processed by a microcontroller.

And the microcontroller is used for connecting the metering circuit board and the circuit thereof, acquiring a current value and a voltage value in the circuit which is responsible for monitoring from the metering circuit board and the circuit thereof, and calculating to obtain electric energy data. The microcontroller is also connected with an infrared communication module, a wireless transceiving module and an RS485 communication module, wherein the infrared communication module is used for completing message transceiving with the terminal equipment and transmitting a data acquisition instruction of the terminal equipment to the microcontroller or transmitting data to the terminal equipment. The wireless transceiving module is used for sending electric energy data to an error processor in a network to be tested; and the RS485 communication module is used for completing software upgrading or error detection of the electric energy metering device. The storage unit is used for storing the current value and the voltage value acquired by the metering chip, and can also store corresponding electric energy data, load current segment related information and the like. The liquid crystal display is used for presenting the current power utilization condition, the working state of the electric energy metering device and the like.

Example 7:

in the embodiment 1, how to implement the method for error self-checking of the electric energy metering device provided by the invention is mainly explained from a method perspective. Based on the foregoing embodiments, the present embodiment explains implementation of the method in combination with a specific application environment, and specifically includes, as shown in fig. 13:

in step 601, a power meter (error standard) with known overall error is prepared, and its error data is stored in the memory of the error processor for standby. And connecting the spare error standard device into an electric energy metering system to be tested (the system to be tested for short). The access method can be as described in the embodiment 1.

In step 602, one or more devices are designated as error calculators, which are also managers of error testing procedures, in a system of power metering devices and associated equipment devices.

In step 603, all the electric energy metering devices acquire the electric energy data of the line according to the specified method.

The specified method, including measurements according to specified time and load current segments, is as described in example 1.

In step 604, the data is pre-processed by the designated device (i.e., the error handler described in example 1). The specified device may be a specified power metering device, or may be an error calculator, or may be another specified object having data processing capability.

In step 605, the error calculator obtains the known error data of the error standard, and simultaneously, the electric energy data measured by each electric energy metering device is reported to the error calculator.

In step 606, an error calculator may construct a mathematical equation using the power data and known error data. All or part of the mathematical operation can be realized to be made into hardware electronic circuits or a mixture of hardware and software.

In step 607, the error calculator processes the error data and the power data to measure the overall error of all or a specified portion of the power metering devices.

If the error standard device is connected in series with a certain line, the error of the original electric energy metering device of the line can be calculated by an error calculator by using another formula.

Example 8:

this embodiment provides a method of how to fabricate an error handler (also referred to as an error handler in each embodiment 1) so that it can be provided to each of the above embodiments for calculation of the overall error of the system under test. As shown in fig. 14, the implementation steps specifically include:

in step 701, the fabrication of an electric energy metering device with known overall error is started.

In step 702, a voltage sensor, a current sensor and an electric energy meter having the same electrical class as other electric energy metering devices in the network to be tested are selected.

In step 703, the electric energy meter, the current sensor and the voltage sensor are installed in a housing for preventing electromagnetic field interference, and an error standard is manufactured.

In step 704, the overall error of the error standard is obtained through experimental measurements.

The measurement method can use the methods existing in the prior art, such as: and reading data through a high-precision instrument, and comparing the readings of the error standard and the high-precision instrument so as to obtain the overall error of the error standard.

In step 705, the error standard is switched into the designated line of the system under test.

The access method of the error standard may be any one of those disclosed in embodiment 1.

Next, a method for calculating an overall error of an electric energy metering device in a system under test in a complex environment will be described with reference to embodiment 9. The system environment involved in example 9 is more complicated than other examples, and each electric energy metering device is optionally equipped with calculation capability to calculate the respective overall error.

Example 9:

the embodiment provides a method for calculating the integral error of an electric energy metering device in a system to be tested in a complex environment. In comparison with other embodiments, each of the electric energy metering devices may be optionally equipped with a calculation capability to calculate the respective overall error. As shown in fig. 15, the implementation method specifically includes the following steps:

in step 801, an error check of the entire power metering device is started.

In step 802, the system inlet and outlet electric energy metering devices Ei and Wj are numbered, and an error calculator is assigned.

The error calculator preferably employs the error calculator manufactured in embodiment 8.

In step 803, the error handler determines the individual device power data recording method and the data exchange method.

The recording method comprises the steps of recording once every other time, recording according to what data format, preprocessing data after recording or not, and the like. The data exchange method comprises the steps of reporting to an error calculator periodically in the way of reporting described in the embodiment 1; or after receiving a reporting instruction, reporting the recorded electric energy data to the error calculator.

In step 804, the electric energy metering device in the system to be tested detects and obtains the electric energy data of the line where the electric energy metering device is located.

In step 805, the electric energy metering device performs the segmented preprocessing of the acquired electric energy data according to the load current if the electric energy metering device has the preprocessing capability according to the respective setting, and then the step 807 is performed. If the energy metering device does not have pre-processing capability, then step 806 is entered.

In step 806, the error processor collects and pre-processes the electric energy data reported by the electric energy metering devices.

The preprocessing includes storing the acquired power data in a manner that distinguishes load current segments as described in embodiment 1.

In step 807, the error handler determines whether the energy metering devices each calculate their own error, and if so proceeds to step 810, and if not, proceeds to step 808.

In step 808, the error processor swaps the stored data to each device to calculate the respective overall error.

In step 809, each energy metering device exchanges its own overall error to the error handler or the designated device, and one round of error testing is finished and the next round is ready to start.

In step 810, the error handler column equation sets calculate the overall error for each energy metering device.

In step 811, the error handler communicates the overall error for each energy metering device to the designated device.

In step 812, one round of error testing is complete and ready to begin the next round.

Example 10:

the embodiment of the present invention is a data processing method for error self-checking of an electric energy metering device extracted from the specific implementation method described in embodiment 9, wherein each electric energy metering device in a system to be tested stores respective load current segment distribution information, as shown in fig. 16, the method includes:

in step 901, the electric energy metering device B records electric energy data of the line where the electric energy metering device B is located according to a preset mode.

In step 902, load current segment distribution information stored by itself is retrieved, a load current segment to which the recorded electric energy data belongs is analyzed, and the recorded electric energy data is stored in a storage area identified by the corresponding load current segment.

In step 903, the one or more recorded electric energy data stored in the storage area are sent to an error processor, so that the error processor can calculate the overall error of each electric energy metering device in the system to be measured.

The embodiment of the invention provides a data processing method for error self-checking of an electric energy metering device, which is suitable for the electric energy metering device related in each embodiment of the invention.

In combination with the embodiment, there is also an extensible scheme, which can further utilize the computing power of each electric energy metering device in the system to be tested, and improve the computing efficiency of each electric energy metering device in the system to be tested. Specifically, if the electric energy metering device B has the capability of calculating the overall error, as shown in fig. 17, the method further includes:

in step 904, the electric energy metering device B receives an instruction for calculating an overall error sent by the error processor, where the instruction carries electric energy data reported by each electric energy metering device in the whole system to be tested, which is acquired by the error processor.

In step 905, the electric energy metering device B calculates an overall error of itself according to the electric energy data carried in the instruction for calculating the overall error.

In step 906, the electric energy metering device B transmits the calculated self overall error to the error processor.

In order to further disclose how the electric energy metering device B in this embodiment calculates the total error of itself according to the electric energy data carried in the instruction for calculating the total error, this embodiment further provides an implementation manner, which specifically includes:

the electric energy data carried in the instruction for calculating the overall error comprises electric energy data recorded by the incoming line electric energy metering device and the outgoing line electric energy metering device;

according to the fact that the electric energy data recorded by the incoming line electric energy metering device and the outgoing line electric energy metering device meet the principle of electric energy conservation, the electric energy data recorded by the incoming line electric energy metering device and the electric energy data recorded by the outgoing line electric energy metering device in the specified time are combined with error value variables under the load current segmentation respectively to construct an energy balance equation set; the energy balance equation set comprises error value variables of each electric energy metering device in each load current segment; acquiring electric energy data stored in corresponding load current segments by each electric energy metering device; and substituting the electric energy data into an energy balance equation set according to the corresponding load current subsection as a coefficient of a corresponding error value variable, substituting a known error value of an error standard device into the equation set, and solving the energy balance equation set to obtain the error value of each electric energy metering device in each load current subsection.

In the embodiments of the present invention, it is emphasized how to calculate the overall error according to the electric energy data reported by each electric energy metering device, therefore, the specific entity for performing the calculation function or storing the electric energy data is not limited to the error handler or the electric energy metering device described in the embodiments of the present invention, and those skilled in the art can also apply the calculation method disclosed in the present invention to other execution entities without creative thinking, and similar equivalent implementations all belong to the protection scope of the present invention.

It will be further understood by those skilled in the art that all or part of the steps in the method for implementing the above embodiments may be implemented by relevant hardware instructed by a program, and the program may be stored in a computer-readable storage medium, including ROM/RAM, magnetic disk, optical disk, etc.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.

Claims

1. A method for detecting the integral error of electric energy metering devices is characterized in that an error standard device with a known integral error value is connected into a system to be detected, each electric energy metering device measures the electric energy data of a line where the electric energy metering device is located, reports the electric energy data to an error processor for data processing, and then gives the electric energy data to an error calculator to calculate the integral error of each electric energy metering device according to the sectional consideration of load current, and the method comprises the following steps:

the system to be tested is a non-energy-consumption system, and the sum of the electric energy flowing through the incoming electric energy metering devices in the system to be tested is equal to the sum of the electric energy flowing through the outgoing electric energy metering devices in the system to be tested;

accessing an error standard device with a known overall error value in the system to be tested; the error standard device comprises an electric energy metering chip and a circuit thereof, a voltage sensor and a current sensor; the electric energy metering chip and the circuit thereof, the voltage sensor and the current sensor are shielded so as to reduce the influence of electromagnetic interference to a preset threshold value;

the electric energy metering devices and the error standard device measure and record respective electric energy data according to a preset mode, and report the electric energy data to the data processor;

the error calculator calculates the overall error of each electric energy metering device according to the load current sectional consideration according to the received electric energy data subjected to data processing.

2. The method of claim 1, wherein the accessing of the error standard with a known overall error value in the system under test specifically comprises:

connecting the error standard device in series or in parallel to a line where any electric energy metering device in the system to be tested is located; or,

and adding a new line between the system to be tested and the electric load for the error standard device.

3. The method according to claim 1, wherein the overall error is a true error of the operating state of the electric energy metering device, and specifically comprises:

the method comprises the steps of calculating the error sum caused by the self-metering accuracy of an electric energy metering chip and a circuit thereof, a current transformer and a voltage transformer, and the error sum caused by other influencing factors;

wherein, the sum of errors caused by other influencing factors comprises: the error caused by the influence of the electromagnetic environment of the three parts on the self and the error caused by the mutual interference of the three parts.

4. The method according to claim 1, wherein the electric energy metering device measures and records respective electric energy data, specifically comprising:

determining the load current segment to which the electric energy data belongs according to the measured electric energy data and the load current value;

and searching the position corresponding to the load current segment in the storage area to finish recording and storing.

5. The method of claim 1, wherein the error handler specifically comprises:

the error calculator receives electric energy and related current data from the electric energy metering device and the error standard device, and determines and classifies the load current segment to which the electric energy data belongs according to the current data;

storing the electric energy data which are classified and processed according to the load current;

the stored power data is transmitted to a designated error calculator or a designated object.

6. The method of claim 1, wherein the error processor embodies the body comprising,

the electric energy measuring device for measuring the electric energy data, other electric energy measuring devices in the system to be measured, an error standard device or an error calculator.

7. The method of claim 1, wherein the error calculator calculates the overall error of each energy metering device based on the load current segment consideration based on the received data-processed energy data, and specifically comprises:

according to the fact that electric energy data recorded by an incoming line electric energy metering device and an outgoing line electric energy metering device in the system to be tested meet an electric energy conservation principle, the electric energy data recorded by the incoming line electric energy metering device and the electric energy data recorded by the outgoing line electric energy metering device in a specified time are combined with error value variables of the incoming line electric energy metering device and the outgoing line electric energy metering device under the load current segmentation respectively to construct an energy balance equation, and N equations can be formed and form an equation set by reading the electric energy data of the system to be tested for N times, wherein N is a natural number; the energy balance equation set comprises error value variables of each electric energy metering device in each load current segment;

the error calculator acquires the stored electric energy data of each electric energy metering device in the corresponding load current section;

and the electric energy data is segmented according to the corresponding load current, substituted into an energy balance equation set to serve as a coefficient of a corresponding error value variable, and the energy balance equation set is solved by using the known error of an error standard device to obtain the error value of each electric energy metering device in each load current segment.

8. The method according to claim 1, wherein the presetting mode specifically comprises:

setting each electric energy metering device in the system to be tested to segment according to the designated time and the load current, measuring and recording respective electric energy data, classifying, distinguishing, storing and reporting to an error calculator according to the load current segments; or,

and setting each electric energy metering device in the system to be tested to measure and record respective electric energy data and current data according to the designated time, and reporting the electric energy data and the current data to an error calculator for processing.

9. The utility model provides a device of whole error detection of electric energy metering device which characterized in that, the device includes the structure of data transceiver unit, memory cell and processing module, specifically includes:

the storage unit is used for storing various electric energy and related data;

10. The apparatus of claim 9,

the device is specifically an electric energy metering device and is also used for measuring and storing electric energy data and related data of the line where the device is located; and/or the presence of a gas in the gas,

the device is specifically an error calculator and is used for processing data of the device and data of a related electric energy metering device; and/or the presence of a gas in the gas,

the device is specifically an error calculator and is used for calculating the integral error of the device per se according to the load current segmentation.

11. A system for self-checking the integral error of an electric energy metering device is characterized in that an error standard device with a known integral error value is connected into a system to be tested, each electric energy metering device measures the electric energy data of a line where the electric energy metering device is located and reports the electric energy data to an error processor to calculate the error of each electric energy metering device;

the system to be tested is a non-energy-consumption system, and the sum of electric energy flowing through the incoming electric energy metering devices in the system to be tested is equal to the sum of electric energy flowing through the outgoing electric energy metering devices in the system to be tested;

the error standard device with known overall error is connected to the system to be tested and comprises an electric energy meter, a voltage transformer and a current transformer; wherein the electric energy meter, the voltage sensor and the current sensor are installed in a housing having a function of shielding external electromagnetic interference; the integral error is caused by the self metering accuracy of the electric energy meter, the current transformer and the voltage transformer, and also comprises an error caused by an influence factor; wherein, the error caused by the influence factor comprises: errors caused by the influence of the environment where the three are located and errors caused by mutual interference among the electric energy meter, the current transformer and the voltage transformer;