CN109270482B - Online evaluation method for metering accuracy of voltage transformer and terminal equipment - Google Patents

Abstract

The invention is applicable to the technical field of electric energy measurement, and provides an on-line evaluation method and terminal equipment for the measurement accuracy of a voltage transformer. The method includes: acquiring the gateway data collected by the data acquisition system, acquiring the standard gateway data stored in the comprehensive test management platform, and determining the parameter change trend of the capacitance, dielectric loss and corresponding line loss of the voltage transformer according to the gateway data and the standard gateway data. , and determine the measurement accuracy of the voltage transformer according to the parameter change trend of the capacitance, dielectric loss and corresponding line loss. After the above solution is adopted, the management level and reliability of gateway metering operation and maintenance are improved, and at the same time, online status monitoring, fault diagnosis and status evaluation of the entire metering gateway equipment are expanded, which provides a powerful tool for the status detection and intelligent diagnosis and evaluation of gateway metering. support.

Description

On-line evaluation method and terminal equipment for measuring accuracy of voltage transformer

technical field

The invention belongs to the technical field of electric energy measurement, and in particular relates to an on-line evaluation method and terminal equipment for the measurement accuracy of a voltage transformer.

Background technique

At present, according to the regulations on the verification of electric energy metering devices, various types of metering devices are inspected by periodic detection. However, in the actual power generation and electricity trade settlement, the gateway metering device has problems such as metering device failure or out-of-tolerance every year. One of the important factors is that Failure and out-of-tolerance of capacitive voltage transformers.

CVT (Continuously Variable Transmission, capacitive voltage transformer) is widely used in measurement voltage transformers with voltage levels of 35kV and above. Compared with electromagnetic transformers, this type of voltage transformer has lower error stability and is prone to occur. Out-of-tolerance phenomenon, and there is no effective means to monitor the error changes of various metering devices during the inspection period. The failure or out-of-tolerance of the voltage transformer during the inspection period has become one of the most important factors affecting the measurement accuracy. During the detection period, the error power continues to expand, which affects the fairness and accuracy of power transactions, and even threatens the safe operation of the power grid in severe cases.

SUMMARY OF THE INVENTION

In view of this, the embodiments of the present invention provide an on-line evaluation method and terminal equipment for the measurement accuracy of a voltage transformer, so as to solve the problem that in the prior art, due to the physical characteristics of the CVT, the error power continuously expands during the detection period, which affects the electricity transaction. Fairness and accuracy, serious situations may even threaten the safe operation of the power grid.

A first aspect of the embodiments of the present invention provides an online evaluation method for the measurement accuracy of a voltage transformer, including:

Obtain the gateway data collected by the data acquisition system;

Obtain the standard gateway data stored in the comprehensive test management platform;

Determine the parameter change trend of the capacitance, dielectric loss and corresponding line loss of the voltage transformer according to the gateway data and standard gateway data, and determine the measurement accuracy of the voltage transformer according to the parameter change trend of the capacitance, dielectric loss and corresponding line loss .

As a further technical solution, the method also includes:

The line loss rate expression of the line loss between the metering gate of the voltage transformer and the reference point is:

r'=rf ₁ +f ₂ , where r' is the displayed line loss rate of the acquisition system, r is the actual line loss rate of the line, f ₁ is the ratio difference between the metering point and the voltage transformer, and f ₂ is the reference point and the voltage transformer Comparison.

As a further technical solution, the voltage transformer includes a capacitive voltage dividing unit and an electromagnetic unit, and the capacitive voltage dividing unit includes a parallel-connected film-paper composite medium or a parallel-connected full-film medium.

As a further technical solution, the influence of the insulation structure of the voltage transformer on the metering performance includes internal insulation performance, external insulation performance and aging performance.

As a further technical solution, the method also includes:

Judging whether the measurement accuracy of the voltage transformer is qualified according to the pre-stored accuracy judgment standard;

If it is determined that the measurement accuracy of the voltage transformer is unqualified, an alarm instruction is sent to the alarm device, and the alarm instruction is used to instruct the alarm device to alarm.

A second aspect of the embodiments of the present invention provides an on-line evaluation device for measuring accuracy of a voltage transformer, including:

The gateway data acquisition module is used to acquire the gateway data collected by the data acquisition system;

The standard gateway data acquisition module is used to obtain the standard gateway data stored in the comprehensive test management platform;

The measurement accuracy determination module is used to determine the parameter change trend of the capacitance, dielectric loss and corresponding line loss of the voltage transformer according to the gateway data and standard gateway data, and according to the capacitance, dielectric loss and corresponding line loss of the voltage transformer. The parameter change trend determines the measurement accuracy of the voltage transformer.

As a further technical solution, the device also includes:

The line loss rate determination module is used for the line loss rate expression of the line loss between the metering gate of the voltage transformer and the reference point:

r'=rf ₁ +f ₂ , where r' is the displayed line loss rate of the acquisition system, r is the actual line loss rate of the line, f ₁ is the ratio difference between the metering point and the voltage transformer, and f ₂ is the reference point and the voltage transformer Comparison.

As a further technical solution, the voltage transformer includes a capacitive voltage dividing unit and an electromagnetic unit, and the capacitive voltage dividing unit includes a parallel-connected film-paper composite medium or a parallel-connected full-film medium.

A third aspect of the embodiments of the present invention provides a terminal device for on-line evaluation of measurement accuracy of a voltage transformer, including a memory, a processor, and a computer program stored in the memory and executable on the processor, the When the processor executes the computer program, the method as described in the above-mentioned first aspect is implemented.

A fourth aspect of the embodiments of the present invention provides a computer-readable storage medium, where the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, implements the method described in the first aspect.

Compared with the prior art, the embodiment of the present invention has the beneficial effect that: after adopting the above scheme, the parameter change trend of the capacitance, dielectric loss and corresponding line loss of the voltage transformer can be determined according to the gate data and the standard gate data, and according to The change trend of the parameters of capacitance, dielectric loss and corresponding line loss determines the measurement accuracy of the voltage transformer, which improves the management level and reliability of the gateway metering operation and maintenance, and at the same time expands the realization of the entire metering gateway equipment (including electric energy meters, current and voltage On-line status monitoring, fault diagnosis and status assessment of transformers) provide strong support for status detection and intelligent diagnosis and assessment of gateway metering.

Description of drawings

In order to illustrate the technical solutions in the embodiments of the present invention more clearly, the following briefly introduces the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only for the present invention. In some embodiments, for those of ordinary skill in the art, other drawings can also be obtained according to these drawings without any creative effort.

1 is a flow chart of steps of a method for on-line evaluation of the measurement accuracy of a voltage transformer provided by an embodiment of the present invention;

2 is a flow chart of steps of a method for on-line evaluation of the measurement accuracy of a voltage transformer provided by another embodiment of the present invention;

3 is a schematic structural diagram of an on-line evaluation device for measuring accuracy of a voltage transformer provided by an embodiment of the present invention;

4 is a schematic diagram of a terminal device for on-line evaluation of the measurement accuracy of a voltage transformer provided by an embodiment of the present invention;

5 is a schematic diagram of a system configuration connection provided by an embodiment of the present invention;

6 is a schematic diagram of basic electrical connection of a voltage transformer provided by an embodiment of the present invention;

7 is a schematic diagram of the insulation electrical connection of a voltage transformer provided by an embodiment of the present invention;

FIG. 8 is a schematic diagram of insulation electrical connection of a voltage transformer provided by another embodiment of the present invention;

FIG. 9 is a schematic diagram of an insulating electrical connection of a voltage transformer provided by an embodiment of the present invention.

Detailed ways

In the following description, for the purpose of illustration rather than limitation, specific details such as specific system structures and technologies are set forth in order to provide a thorough understanding of the embodiments of the present invention. However, it will be apparent to those skilled in the art that the present invention may be practiced in other embodiments without these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present invention with unnecessary detail.

In order to illustrate the technical solutions of the present invention, the following specific embodiments are used for description.

As shown in FIG. 1, it is a flowchart of steps of a method for on-line evaluation of measurement accuracy of a voltage transformer provided by an embodiment of the present invention, including:

In step S101, the gateway data collected by the data collection system is acquired.

Step S102, obtaining standard gateway data stored in the comprehensive test management platform.

Step S103: Determine the parameter change trend of the capacitance, dielectric loss and corresponding line loss of the voltage transformer according to the gateway data and the standard gateway data, and determine the parameter change trend of the voltage transformer according to the parameter change trend of the capacitance, dielectric loss and corresponding line loss. Metering accuracy.

Specifically, this scheme is suitable for the analysis of parameters related to the measurement accuracy of the gateway metering capacitive voltage transformer, and then realizes the remote online evaluation and early warning of the operating CVT accuracy change conditions, and replaces the online real-time inspection method that is difficult to popularize with the evaluation and early warning mechanism. , establish more than 10 kinds of internal and external factor parameters and measurement characteristics change relationship models, form a rich and powerful background calculation model library, the system automatically obtains real-time data and test data, automatically analyzes the comprehensive error, and gives the actual error evaluation value under standard conditions. Comprehensive status of CVT, different levels of alarms are given for abnormality, and offline production plans are automatically generated. This evaluation system achieves the improvement of the level and reliability of gate metering operation and maintenance management, and at the same time expands the realization of online status monitoring, fault diagnosis and status evaluation of the entire metering gateway equipment, including electric energy meters and current and voltage transformers. Intelligent diagnostic evaluation provides strong support.

In addition, as shown in Figure 5, in a specific instance, the method further includes:

The line loss rate expression of the line loss between the metering gate of the voltage transformer and the reference point is:

r'=rf ₁ +f ₂ , where r' is the displayed line loss rate of the acquisition system, r is the actual line loss rate of the line, f ₁ is the ratio difference between the metering point and the voltage transformer, and f ₂ is the reference point and the voltage transformer Comparison.

Specifically, in addition, in a specific case, in terms of system configuration, according to DL/T 448-2016 "Technical Management Regulations for Electric Energy Metering Devices", in principle, the electric energy metering device used for trade settlement should be set at the property rights boundary of the power supply facility At the other end of the power generation enterprise's grid line, the connection line between the power grid enterprises and the special line power supply circuit, the electric energy metering device for assessment should be equipped. parameter decision. However, when the measurement accuracy changes, the line loss rate calculated from the background data of the collection system will change accordingly.

In addition, in a specific case, the voltage transformer includes a capacitive voltage dividing unit and an electromagnetic unit, and the capacitive voltage dividing unit includes a parallel film-paper composite medium or a parallel full-film medium. The basic electrical schematic diagram is shown in Figure 6. shown.

In addition, in a specific instance, the influence of the insulation structure of the voltage transformer on the metering performance includes the inner insulation performance, the outer insulation performance and the aging performance.

In addition, as shown in Figure 7, Figure 8 and Figure 9, in a specific case, the influence of the CVT insulation structure on its metering performance mainly needs to consider the influence of internal insulation, external insulation, aging, temperature and humidity, and introduces leakage to the equipment model. The influence of parameters such as current, stray capacitance, power frequency resistance, etc., where Zm is the excitation impedance, Zd is the damping impedance, ZL is the load impedance, and _C1 is the CVT high-voltage capacitor in the dielectric parallel connection, _C2 is the CVT low-voltage capacitor, R1, R2 represents the comprehensive insulation resistance of the equipment, and C ₁ ' and C ₂ ' are the high-voltage and low-voltage comprehensive capacitances respectively, considering the influence of factors such as stray capacitance. During the operation of the CVT, due to the influence of external pollution, temperature and humidity, and aging, the external insulation resistance may decrease, the leakage capacitance of the capacitor may increase, and the local breakdown of the capacitor may cause the capacitance to change.

其中，δ为介质损耗角，不带负荷时，输出U₀与U_S关系如下所示：For the RC parallel model medium, its dielectric loss is

Among them, δ is the dielectric loss angle. When there is no load, the relationship between the output U ₀ and U _S is as follows:

in,

The input-output relationship diagram is equivalent to a basic RC circuit, then the equivalent R and C are:

For the equipment load, ignoring the influence of its changes, ignoring the circuit impedance of the electromagnetic unit, and setting the total equivalent load as ZL', the model is further simplified,

Calculated to get:

The output voltage U decreases with the increase of the low-voltage capacitor C2 and its dielectric loss ε ₂ , and increases with the increase of its high-voltage capacitor C1 and its dielectric loss ε _1. The output voltage U varies with the equipment insulation performance parameters, namely As a result, the measurement accuracy varies with the insulation performance parameters of the equipment.

Based on the above principles, based on the cross-professional big data sharing platform, establish a remote online early warning system for the measurement accuracy of the gateway metering capacitive voltage transformer, with the evaluation and early warning module as the core, the collection system and the comprehensive test management platform data as the resources, real-time monitoring Equipment operating conditions, analyze the change trend of CVT capacitance, dielectric loss and corresponding line loss and other parameters, periodically evaluate equipment aging status, and predict the degree of change in CVT accuracy.

In addition, in a specific instance, the method further includes:

Step S201, according to the pre-stored accuracy judgment standard, judge whether the measurement accuracy of the voltage transformer is qualified.

Step S202, if it is determined that the measurement accuracy of the voltage transformer is unqualified, an alarm instruction is sent to an alarm device, and the alarm instruction is used to instruct the alarm device to alarm.

As shown in FIG. 3, it is a schematic structural diagram of a device for on-line evaluation of measurement accuracy of a voltage transformer provided by an embodiment of the present invention, including:

The gateway data acquisition module 301 is used for acquiring the gateway data collected by the data acquisition system.

The standard gateway data acquisition module 302 is used to acquire the standard gateway data stored in the comprehensive test management platform.

The measurement accuracy determination module 303 is used to determine the parameter change trend of the capacitance, dielectric loss and corresponding line loss of the voltage transformer according to the gateway data and the standard gateway data, and according to the capacitance, dielectric loss and corresponding line loss of the voltage transformer The variation trend of the parameters determines the measurement accuracy of the voltage transformer.

In addition, in a specific instance, the apparatus further includes:

The line loss rate determination module is used for the line loss rate expression of the line loss between the metering gate of the voltage transformer and the reference point:

r'=rf ₁ +f ₂ , where r' is the displayed line loss rate of the acquisition system, r is the actual line loss rate of the line, f ₁ is the ratio difference between the metering point and the voltage transformer, and f ₂ is the reference point and the voltage transformer Comparison.

In addition, in a specific instance, the voltage transformer includes a capacitive voltage dividing unit and an electromagnetic unit, and the capacitive voltage dividing unit includes a parallel-connected film-paper composite medium or a parallel-connected full-film medium.

In addition, in a specific instance, the influence of the insulation structure of the voltage transformer on the metering performance includes the inner insulation performance, the outer insulation performance and the aging performance.

In addition, in a specific instance, the apparatus further includes:

Judging whether the measurement accuracy of the voltage transformer is qualified according to the pre-stored accuracy judgment standard.

If it is determined that the measurement accuracy of the voltage transformer is unqualified, an alarm instruction is sent to the alarm device, and the alarm instruction is used to instruct the alarm device to alarm.

Specifically, the pre-stored accuracy judgment standard records the qualified value range of the accuracy. If it is judged that the measurement accuracy of the voltage transformer is not within the qualified range, it is judged that the measurement accuracy of the voltage transformer is unqualified, and an alarm command is sent to the alarm. The device reminds the staff to deal with it in time. The alarm type can be one or more of voice alarm, vibration alarm, buzzer alarm or information prompt alarm type.

In a specific case, an independent model of each gateway CVT is established, and with the help of the change of high-voltage test parameters, the degree of change in equipment accuracy is calculated and the comprehensive theoretical error is given. Based on the platform of the gateway acquisition system, the theoretical error change is verified by the change of the line loss data corresponding to the CVT, and the CVT accuracy is comprehensively judged to be abnormal, and an early warning of the abnormal change trend is given. The CVT physical model under several typical environmental factors is established, and the relationship model between the CVT primary test parameters and the secondary measurement accuracy test parameters is established. Collaborative analysis of multi-characteristic factors under big data, extensive and profound mining of a large number of data applications from the electricity consumption information collection system and comprehensive test data platform, and organically combined comprehensive analysis. The multi-channel data synchronization acquisition method, the CVT measurement performance online monitoring system needs to collect the CVT sampling values at multiple intervals in the substation, to realize the synchronization of the collected data between multiple electrical quantities, to ensure that the synchronization delay error is less than 10us, and to ensure the synchronization of data sex, effectiveness. Comprehensive evaluation method, based on the model and various evaluation methods, carry out comprehensive evaluation, make an overall judgment on the CVT measurement characteristics, the method is synergistic, the test parameter correlation and the online line loss analysis are evaluated together, and they are mutually verified. , greatly improving the reliability of the method. The relationship model between CVT high-voltage test parameters and measurement accuracy test parameters is established. The application and mining of inter-professional test data makes full use of the relatively short period of high-voltage test, establishes the relationship between the primary and secondary parameters of the equipment, and makes up for the shortcoming of long test period of measurement accuracy by means of online comprehensive evaluation. The offline test data is combined with the online real-time power data to realize the in-depth application of relevant data. Achieve online evaluation of CVT metering performance, and at the same time realize comprehensive error measurement under the actual state of the establishment of the overall energy metering device, and realize online state monitoring, fault diagnosis and state evaluation of the entire metering gateway equipment (including energy meters, current and voltage transformers), It provides strong support for state detection and intelligent diagnosis and evaluation of gateway metering. Compared with the current online verification method, the present invention has low investment cost and has better development prospects and space under the background of big data application.

It should be understood that the size of the sequence numbers of the steps in the above embodiments does not mean the sequence of execution, and the execution sequence of each process should be determined by its functions and internal logic, and should not constitute any limitation to the implementation process of the embodiments of the present invention.

4 is a schematic diagram of a terminal device for on-line evaluation of the measurement accuracy of a voltage transformer provided by an embodiment of the present invention. The terminal device 4 in this embodiment includes: a processor 40, a memory 41, and a terminal device stored in the memory 41 and available in the A computer program 42 running on the processor 40, such as a voltage transformer metering accuracy online evaluation program. When the processor 40 executes the computer program 42, the steps in each of the foregoing method embodiments are implemented, for example, steps 101 to 103 shown in FIG. 1 . Alternatively, when the processor 40 executes the computer program 42, the functions of the modules/units in each of the foregoing apparatus embodiments, such as the functions of the modules 301 to 303 shown in FIG. 3, are implemented.

Exemplarily, the computer program 42 may be divided into one or more modules/units, and the one or more modules/units are stored in the memory 41 and executed by the processor 40 to complete the this invention. The one or more modules/units may be a series of computer program instruction segments capable of completing specific functions, and the instruction segments are used to describe the computer program 42 in the voltage transformer measurement accuracy online evaluation terminal device 4. Implementation process. For example, the computer program 42 can be divided into a synchronization module, an aggregation module, an acquisition module, and a return module (modules in a virtual device), and the specific functions of each module are as follows:

Obtain the gateway data collected by the data acquisition system.

Obtain the standard gateway data stored in the comprehensive test management platform.

Determine the parameter change trend of the capacitance, dielectric loss and corresponding line loss of the voltage transformer according to the gateway data and standard gateway data, and determine the measurement accuracy of the voltage transformer according to the parameter change trend of the capacitance, dielectric loss and corresponding line loss .

The line loss rate expression of the line loss between the metering gate of the voltage transformer and the reference point is:

r'=rf ₁ +f ₂ , where r' is the displayed line loss rate of the acquisition system, r is the actual line loss rate of the line, f ₁ is the ratio difference between the metering point and the voltage transformer, and f ₂ is the reference point and the voltage transformer Comparison.

The voltage transformer includes a capacitive voltage dividing unit and an electromagnetic unit, and the capacitive voltage dividing unit includes a parallel-connected film-paper composite medium or a parallel-connected full-film medium.

The influence of the insulation structure of the voltage transformer on the metering performance includes the inner insulation performance, the outer insulation performance and the aging performance.

Judging whether the measurement accuracy of the voltage transformer is qualified according to the pre-stored accuracy judgment standard.

If it is determined that the measurement accuracy of the voltage transformer is unqualified, an alarm instruction is sent to the alarm device, and the alarm instruction is used to instruct the alarm device to alarm.

The terminal device 4 for on-line evaluation of the measurement accuracy of the voltage transformer may be a computing device such as a desktop computer, a notebook computer, a palmtop computer, and a cloud server. The terminal equipment for on-line evaluation of the measurement accuracy of the voltage transformer may include, but is not limited to, a processor 40 and a memory 41 . Those skilled in the art can understand that FIG. 4 is only an example of the terminal device 4 for the online evaluation of the measurement accuracy of the voltage transformer, and does not constitute a limitation on the terminal device 4 for the online evaluation of the measurement accuracy of the voltage transformer, which may include more than shown in the figure. Or fewer components, or a combination of some components, or different components, for example, the terminal equipment for on-line evaluation of the measurement accuracy of the voltage transformer may also include input and output devices, network access devices, buses, and the like.

The so-called processor 40 may be a central processing unit (Central Processing Unit, CPU), and may also be other general-purpose processors, digital signal processors (Digital Signal Processors, DSP), application specific integrated circuits (Application Specific Integrated Circuit, ASIC), Off-the-shelf programmable gate array (Field-Programmable Gate Array, FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, and the like. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.

The memory 41 may be an internal storage unit of the terminal device 4 for evaluating the measurement accuracy of the voltage transformer online, such as a hard disk or memory of the terminal device 4 for evaluating the online measurement accuracy of the voltage transformer. The memory 41 may also be an external storage device of the terminal device 4 for the online measurement accuracy of voltage transformer measurement, such as a plug-in hard disk or a smart memory card equipped on the terminal device 4 for online measurement of voltage transformer measurement accuracy. (Smart Media Card, SMC), Secure Digital (Secure Digital, SD) card, flash memory card (Flash Card), etc. Further, the memory 41 may also include both an internal storage unit of the terminal device 4 for on-line evaluation of the measurement accuracy of the voltage transformer and an external storage device. The memory 41 is used to store the computer program and other programs and data required by the terminal equipment for on-line evaluation of the measurement accuracy of the voltage transformer. The memory 41 can also be used to temporarily store data that has been output or will be output.

Those skilled in the art can clearly understand that, for the convenience and simplicity of description, only the division of the above-mentioned functional units and modules is used as an example. Module completion, that is, dividing the internal structure of the device into different functional units or modules to complete all or part of the functions described above. Each functional unit and module in the embodiment may be integrated in one processing unit, or each unit may exist physically alone, or two or more units may be integrated in one unit, and the above-mentioned integrated units may adopt hardware. It can also be realized in the form of software functional units. In addition, the specific names of the functional units and modules are only for the convenience of distinguishing from each other, and are not used to limit the protection scope of the present application. For the specific working processes of the units and modules in the above-mentioned system, reference may be made to the corresponding processes in the foregoing method embodiments, which will not be repeated here.

In the foregoing embodiments, the description of each embodiment has its own emphasis. For parts that are not described or described in detail in a certain embodiment, reference may be made to the relevant descriptions of other embodiments.

Those of ordinary skill in the art can realize that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Skilled artisans may implement the described functionality using different methods for each particular application, but such implementations should not be considered beyond the scope of the present invention.

In the embodiments provided by the present invention, it should be understood that the disclosed apparatus/terminal device and method may be implemented in other manners. For example, the apparatus/terminal device embodiments described above are only illustrative. For example, the division of the modules or units is only a logical function division. In actual implementation, there may be other division methods, such as multiple units. Or components may be combined or may be integrated into another system, or some features may be omitted, or not implemented. On the other hand, the shown or discussed mutual coupling or direct coupling or communication connection may be through some interfaces, indirect coupling or communication connection of devices or units, and may be in electrical, mechanical or other forms.

The units described as separate components may or may not be physically separated, and components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution in this embodiment.

In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically alone, or two or more units may be integrated into one unit. The above-mentioned integrated units may be implemented in the form of hardware, or may be implemented in the form of software functional units.

The integrated modules/units, if implemented in the form of software functional units and sold or used as independent products, may be stored in a computer-readable storage medium. Based on this understanding, the present invention can implement all or part of the processes in the methods of the above embodiments, and can also be completed by instructing relevant hardware through a computer program, and the computer program can be stored in a computer-readable storage medium. When the program is executed by the processor, the steps of the foregoing method embodiments can be implemented. Wherein, the computer program includes computer program code, and the computer program code may be in the form of source code, object code, executable file or some intermediate form, and the like. The computer-readable medium may include: any entity or device capable of carrying the computer program code, a recording medium, a U disk, a removable hard disk, a magnetic disk, an optical disk, a computer memory, a read-only memory (ROM, Read-Only Memory) , Random Access Memory (RAM, Random Access Memory), electric carrier signal, telecommunication signal and software distribution medium, etc. It should be noted that the content contained in the computer-readable media may be appropriately increased or decreased according to the requirements of legislation and patent practice in the jurisdiction, for example, in some jurisdictions, according to legislation and patent practice, the computer-readable media Excluded are electrical carrier signals and telecommunication signals.

The above-mentioned embodiments are only used to illustrate the technical solutions of the present invention, but not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: it is still possible to implement the foregoing implementations. The technical solutions described in the examples are modified, or some technical features thereof are equivalently replaced; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should be included in the within the protection scope of the present invention.

Claims (8)

1. an on-line evaluation method for measuring accuracy of a voltage transformer, is characterized in that, comprising: Obtain the gateway data collected by the data acquisition system; Obtain the standard gateway data stored in the comprehensive test management platform; Determine the parameter change trend of the capacitance, dielectric loss and corresponding line loss of the voltage transformer according to the gateway data and standard gateway data, and determine the measurement accuracy of the voltage transformer according to the parameter change trend of the capacitance, dielectric loss and corresponding line loss; Also includes: The line loss rate expression of the line loss between the metering gate of the voltage transformer and the reference point is: r'=rf ₁ +f ₂ , where r' is the displayed line loss rate of the acquisition system, r is the actual line loss rate of the line, f ₁ is the ratio difference between the metering point and the voltage transformer, and f ₂ is the reference point and the voltage transformer Comparison. 2. The on-line evaluation method for measuring accuracy of a voltage transformer according to claim 1, wherein the voltage transformer comprises a capacitive voltage dividing unit and an electromagnetic unit, and the capacitive voltage dividing unit comprises a parallel film-paper composite medium or a parallel full-film dielectric. 3 . The on-line evaluation method for the measurement accuracy of a voltage transformer according to claim 1 , wherein the influence of the insulation structure of the voltage transformer on the measurement performance includes internal insulation performance, external insulation performance and aging performance. 4 . 4. The method for on-line evaluation of the measurement accuracy of a voltage transformer according to claim 1, further comprising: Judging whether the measurement accuracy of the voltage transformer is qualified according to the pre-stored accuracy judgment standard; If it is determined that the measurement accuracy of the voltage transformer is unqualified, an alarm instruction is sent to the alarm device, and the alarm instruction is used to instruct the alarm device to alarm. 5. An on-line evaluation device for measuring accuracy of a voltage transformer, characterized in that it comprises: The gateway data acquisition module is used to acquire the gateway data collected by the data acquisition system; The standard gateway data acquisition module is used to obtain the standard gateway data stored in the comprehensive test management platform; The measurement accuracy determination module is used to determine the parameter change trend of the capacitance, dielectric loss and corresponding line loss of the voltage transformer according to the gateway data and standard gateway data, and according to the capacitance, dielectric loss and corresponding line loss of the voltage transformer. Parameter variation trends determine the measurement accuracy of voltage transformers; also include: The line loss rate determination module is used for the line loss rate expression of the line loss between the metering gate of the voltage transformer and the reference point: r'=rf ₁ +f ₂ , where r' is the displayed line loss rate of the acquisition system, r is the actual line loss rate of the line, f ₁ is the ratio difference between the metering point and the voltage transformer, and f ₂ is the reference point and the voltage transformer Comparison. 6 . The on-line evaluation device for measuring accuracy of a voltage transformer according to claim 5 , wherein the voltage transformer comprises a capacitive voltage dividing unit and an electromagnetic unit, and the capacitive voltage dividing unit comprises a film-paper composite medium connected in parallel. 7 . or a parallel full-film dielectric. 7. A terminal device for on-line evaluation of the measurement accuracy of a voltage transformer, comprising a memory, a processor, and a computer program stored in the memory and running on the processor, wherein the processor executes the The steps of the method according to any one of claims 1 to 4 are implemented when the computer program is implemented. 8. A computer-readable storage medium storing a computer program, wherein the computer program implements the steps of the method according to any one of claims 1 to 4 when the computer program is executed by a processor .

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