CN217932031U - On-site inspection device for electric energy meter - Google Patents

Abstract

The utility model provides an electric energy meter on-site inspection device, which comprises a load control circuit, a current detector and a controller, wherein the load control circuit comprises an autotransformer and a plurality of load adjusting circuits consisting of a relay and a resistor; the input end of the autotransformer is used for being connected with a live wire inlet end and a zero wire inlet end of the electric energy meter to be tested, and the output end of the autotransformer is respectively connected with the input end of each load adjusting circuit; the input end of the load adjusting circuit is also connected with the output end of the controller, and the output end of the load adjusting circuit is connected with the live wire outlet end of the electric energy meter to be tested; the input end of the current detector is connected with the live wire leading-out terminal of the electric energy meter to be detected, and the output end of the current detector is connected with the input end of the controller. The utility model provides an on-spot verifying attachment of electric energy meter realizes different load regulating circuit's switching and combination through controlling the switching of a plurality of load regulating circuit relay, provides the virtual load current of different ranges for the electric energy meter that awaits measuring.

Description

On-site inspection device for electric energy meter

technical field

The utility model belongs to the technical field of electrical equipment, and more specifically relates to a field inspection device for an electric energy meter.

Background technique

There are many faults such as measurement error in the electric energy meter in the field operation, which seriously affects the accuracy of the electric energy meter measurement, and makes the economic interest relationship between the power supply and the consumer no longer fair and equal. Therefore, it is very necessary to calibrate the electric energy meter.

At present, most of the electric energy meter calibrator is on-site calibration. Calibration personnel usually carry the electric energy meter calibrator to the site to verify the electric energy meter under inspection online. The inspection process is as follows: First, connect the voltage loop of the electric energy meter calibrator in parallel to the voltage loop of the electric energy meter under inspection, and connect the current loop in series. into the current loop of the checked electric energy meter; then, compare the electric energy metering readings of the checked electric energy meter and the electric energy meter calibrator in the same time to obtain the error of the checked electric energy meter; finally, judge the checked electric energy meter according to the error Eligibility. In addition, for the situation where the current of the on-site user is too small or even no current, the virtual load verification method can be used to provide current for the electric energy meter under inspection for inspection.

However, the current virtual load calibration method can only output a virtual load of a range, and cannot adjust the virtual load gear, resulting in low reliability of the calibration results.

Utility model content

The purpose of the utility model is to provide a field inspection device for electric energy meter to solve the technical problem that the virtual load verification method in the prior art can only output a virtual load of a range and cannot adjust the virtual load gear.

In order to achieve the above object, the technical solution adopted by the utility model is to provide a field inspection device for electric energy meter, which includes a load control circuit, a current detector, and a controller, wherein the load control circuit includes an autotransformer and Multiple load regulation circuits composed of relays and resistors;

The input end of the autotransformer is used to connect with the live wire inlet end and the neutral wire inlet end of the electric energy meter to be tested, and the output end of the autotransformer is respectively connected with the input end of each load regulation circuit;

The input terminal of the load regulating circuit is also connected with the output terminal of the controller, and the output terminal of the load regulating circuit is connected with the live wire outlet terminal of the electric energy meter to be tested;

The input end of the current detector is connected with the live wire outlet end of the electric energy meter to be tested, and the output end of the current detector is connected with the input end of the controller.

In a possible implementation manner, the electric energy meter on-site inspection device also includes a metering unit;

The voltage acquisition end of the metering unit is connected to the live wire inlet end and the zero line inlet end of the electric energy meter to be tested, the current acquisition end of the metering unit is connected to the output end of the current detector, and the output end of the metering unit is connected to the input end of the controller connect.

In a possible implementation, the electric energy meter field inspection device also includes a pulse comparator;

The input end of the pulse comparator is respectively connected with the output end of the metering unit and the pulse output device of the electric energy meter to be tested, and the output end of the pulse comparator is connected with the input end of the controller.

In a possible implementation manner, the resistance values of the resistors in each load regulating circuit are different.

In a possible implementation manner, the resistance values of the resistors in each load regulating circuit are the same.

In a possible implementation manner, there are at least three load regulating circuits, and the resistance values of the resistors in each load regulating circuit are partly the same.

In a possible implementation manner, the controller is also connected with a plurality of gear buttons for controlling opening and closing of different load regulation circuits.

In a possible implementation manner, the controller is also connected with a display screen.

In a possible implementation manner, the controller is also connected to a memory.

In a possible implementation manner, the input end of the current detector is connected to the outlet end of the live wire of the electric energy meter to be tested through a current clamp.

The beneficial effects of the electric energy meter field inspection device provided by the utility model are:

The utility model provides a field inspection device for an electric energy meter, which realizes switching and combination of multiple load regulating circuits by controlling the opening and closing of a relay in the load regulating circuit, and provides virtual load currents of different ranges for the electric energy meter to be tested. In this way, the electric energy meter field inspection device not only realizes the adjustable virtual load gear, but also has the advantages of high calibration accuracy, fast verification speed, short cycle, safety and convenience.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the utility model, the following will briefly introduce the accompanying drawings that are required in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only the practical For some novel embodiments, those of ordinary skill in the art can also obtain other drawings based on these drawings without any creative work.

Fig. 1 is a schematic structural view of an electric energy meter field inspection device provided by an embodiment of the present invention;

Fig. 2 is a schematic structural diagram of a load control circuit provided by an embodiment of the present invention.

Detailed ways

The characteristics and exemplary embodiments of various aspects of the application will be described in detail below. In order to make the purpose, technical solution and advantages of the application clearer, the application will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described here are only configured to explain the application, not to limit the application. It will be apparent to one skilled in the art that the present application may be practiced without some of these specific details. The following description of the embodiments is only to provide a better understanding of the present application by showing examples of the present application.

It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is a relationship between these entities or operations. There is no such actual relationship or order between them. Furthermore, the term "comprises", "comprises" or any other variation thereof is intended to cover a non-exclusive inclusion such that a process, method, article, or apparatus comprising a set of elements includes not only those elements, but also includes elements not expressly listed. other elements of or also include elements inherent in such a process, method, article, or device. Without further limitations, an element defined by the statement "comprising..." does not exclude the presence of additional same elements in the process, method, article or device comprising said element.

In order to make the technical problems, technical solutions and beneficial effects to be solved by the utility model clearer, the utility model will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model, and are not intended to limit the utility model.

Below in conjunction with accompanying drawing and specific embodiment, the utility model is described in further detail.

As shown in Fig. 1, the electric energy meter field testing device at least includes a load control circuit, a current detector, and a controller. Specifically, as shown in FIG. 2 , the load control circuit includes an autotransformer and a plurality of load regulation circuits composed of relays and resistors. Among them, the input end of the autotransformer is used to connect with the live line input end and the neutral line input end of the electric energy meter to be tested, and the output end of the autotransformer is respectively connected with the input end of each load regulation circuit; the load regulation circuit The input end is also connected with the output end of the controller, the output end of the load regulation circuit is connected with the live wire outlet end of the electric energy meter to be tested; the input end of the current detector is connected with the live wire outgoing line end of the electric energy meter to be tested, and the output connected to the input of the controller.

In this embodiment, the autotransformer can convert the voltage of the live line to a set voltage, so as to transmit the voltage to the load control circuit. The load regulation circuit in the load control circuit is used to generate virtual load current and transmit the virtual load current to the electric energy meter to be tested. Specifically, the controller can generate corresponding control signals according to the preset control logic to control the opening and closing of the relays in each load regulation circuit, so as to realize the switching and combination of multiple load regulation circuits, thereby providing different virtual load currents .

In this embodiment, the current detector is used to detect the load current of the electric energy meter to be tested, and send the detected load current to the controller. Afterwards, the controller judges whether the load current is greater than the preset threshold, and if the load current is not greater than the preset threshold, the controller sends a control signal to control the opening and closing of the relays in each load regulating circuit to provide different dummy load currents. If the load current is greater than the preset threshold, the controller controls the current detector to send the current signal to the current acquisition terminal of the metering unit.

In a possible implementation, referring to Fig. 1 again, the electric energy meter on-site inspection device also includes a metering unit, wherein the voltage acquisition end of the metering unit is connected to the live wire inlet end and the neutral wire inlet end of the electric energy meter to be tested, The current collection end of the metering unit is connected to the output end of the current detector, and the output end of the metering unit is connected to the input end of the controller.

In this embodiment, the voltage acquisition end of the metering unit is used to collect the voltage signals of the live wire inlet end and the neutral wire inlet end of the electric energy meter to be tested, and transmit the voltage signals to the metering unit. The current acquisition terminal of the metering unit is used to collect the current signal of the electric energy meter to be tested through the current detector, and transmit the current signal to the metering unit, and the metering unit transmits the collected voltage signal and current signal to the controller for storage and display.

In a possible implementation, referring to Fig. 1 again, the electric energy meter field inspection device also includes a pulse comparator;

The input end of the pulse comparator is respectively connected with the output end of the metering unit and the pulse output end of the electric energy meter to be tested, and the output end of the pulse comparator is connected with the input end of the controller.

In this embodiment, the metering unit outputs a standard electric energy pulse signal according to the collected current signal and voltage signal, and transmits the standard electric energy pulse signal to the pulse comparator. The pulse comparator collects the electric energy pulse signal of the electric energy meter to be tested, compares the electric energy pulse signal with the standard pulse signal, obtains an electric energy error value in the form of a percentage, and sends the electric energy error value to the controller. In this way, the controller can generate a verification result based on the electric energy error value.

In a possible implementation manner, the resistance values of the resistors in each load regulating circuit are different.

In this embodiment, the dummy load current that the load regulating circuit can provide can be changed by changing the resistance value of the resistor in the load regulating circuit.

In a possible implementation manner, the resistance values of the resistors in each load regulating circuit are the same.

In a possible implementation manner, there are at least three load regulating circuits, and the resistance values of the resistors in each load regulating circuit are partly the same.

In a possible implementation manner, the controller is also connected with a plurality of gear buttons for controlling opening and closing of different load regulation circuits.

In this embodiment, the shift button is used to send different control signals to control the opening and closing of the relays in each load regulation circuit to provide different dummy load currents.

In a possible implementation manner, the controller is also connected with a display screen.

In this embodiment, the display screen displays the verification result generated by the controller.

In a possible implementation manner, the controller is also connected to a memory.

In this embodiment, the memory is used to store the verification result generated by the controller.

In a possible implementation manner, the input end of the current detector is connected to the outlet end of the live wire of the electric energy meter to be tested through a current clamp.

In this embodiment, the current clamp measures the magnitude of the current without disconnecting the circuit to troubleshoot the line fault.

In order to better understand the on-site inspection device for the electric energy meter provided by the above embodiment, a verification method is provided below by taking three load regulation circuits as examples.

The two ends of the primary side of the autotransformer are respectively connected to the input terminals of the live wire and the neutral wire of the electric energy meter to be tested, such as the mains 220V; the secondary sides of the autotransformer are respectively connected to the input terminals of relays 1, 2 and 3; The input ends of 1, 2, and 3 also receive the control signals 1, 2, and 3 of the controller respectively; the output ends of relays 1, 2, and 3 are respectively connected to resistors 1, 2, and 3; the output ends of resistors 1, 2, and 3 serve as The output end of the load control circuit, the output end of the load control circuit is connected to the live wire outlet of the electric energy meter to be tested; the control signals 1, 2, and 3 respectively control the opening and closing of the relays 1, 2, and 3 to realize the switching of the three load regulating circuits And combination, provide different dummy load currents for the electric energy meter under test.

When there is no virtual load current output on the user side, the power meter under test does not run and has no pulse output; when the virtual load current on the user side is less than the preset threshold, the power meter under test runs slowly and the pulse output frequency is low; When calibrating the electric energy meter to be tested with a range of 100A, the load regulation circuit in the electric energy meter field inspection device will not provide a virtual load current of 100A, and the verification result of the electric energy meter is inaccurate at this time. For the above situation, the on-site inspection device of the electric energy meter can control and switch different load regulation circuits, and input different virtual load currents to the live wire outlet of the electric energy meter to be tested, so that the electric energy meter to be tested can run or speed up the reading speed, so as to This auxiliary energy meter calibration work is carried out. Each load regulation circuit provides a certain range of virtual load current to the electric energy meter to be tested. Through different arrangements and combinations, it can provide virtual load currents in different gears. For example, it can output 1%, 5%, and 10%, 25%, 50%, 75%, and 100% virtual load current to realize the adjustable virtual load gear and realize the verification of the electric energy display field.

Specific operation process:

The relay 1 and the resistor 1 form the first load regulating circuit, the relay 2 and the resistor 2 form the second load regulating circuit, and the relay 3 and the resistor 3 form the third load regulating circuit.

When in the automatic switching load mode, the controller judges whether the load current is greater than the preset threshold, if the load current is not greater than the preset threshold, the controller sends a closing signal to the closing port of the relay 1 of the first load regulating circuit, and the closing The time is 60ms. After 60ms, the controller sends an opening signal to the closing port of relay 1 of the first load regulating circuit to complete the switching of the first regulating circuit; The closing port of relay 2 sends a closing signal, and the closing time is 60ms. After 60ms, the controller sends an opening signal to the closing port of relay 2 of the second load regulating circuit, so as to complete the switching of the second regulating circuit ; And so on... The three load regulating circuits can complete the switching of 7 kinds of load regulating circuits according to the arrangement and combination.

In this automatic load switching mode, after the switching of the first load regulating circuit is completed, it will automatically enter the driver program of the next load regulating circuit after an interval of 60ms.

When in the manual load switching mode, after the switching of the first load regulation circuit is completed, the gear button for controlling the opening and closing of different load regulation circuits is manually pressed, and the gear button drive control program enters the driver program of the next load regulation circuit.

The utility model provides a field inspection device for an electric energy meter, which realizes switching and combination of multiple load regulating circuits by controlling the opening and closing of a relay in the load regulating circuit, and provides virtual load currents of different ranges for the electric energy meter to be tested. In this way, the electric energy meter field inspection device not only realizes the adjustable virtual load gear, but also has the advantages of high calibration accuracy, fast verification speed, short cycle, safety and convenience.

The present application also provides a computer program product, which has a program code, and when the program code runs in a corresponding processor, controller, computing device or terminal, it executes the related functions of the above-mentioned controller. Those skilled in the art should understand that the devices provided in the embodiments of the present application may be implemented in various forms of hardware, software, firmware, dedicated processors or combinations thereof. Special purpose processors may include Application Specific Integrated Circuits (ASICs), Reduced Instruction Set Computers (RISCs), and/or Field Programmable Gate Arrays (FPGAs). The proposed methods and devices are preferably implemented as a combination of hardware and software. The software is preferably installed as an application program on the program storage device. It is typically a computer platform based machine having hardware, such as one or more central processing units (CPUs), random access memory (RAM), and one or more input/output (I/O) interfaces. An operating system is also typically installed on the computer platform. Various procedures and functions described herein may be part of the application program, or a part thereof may be executed by the operating system.

Those skilled in the art can clearly understand that for the convenience and brevity of description, only the division of the above-mentioned functional units and modules is used for illustration. In practical applications, the above-mentioned functions can be assigned to different functional units, Completion of modules means that the internal structure of the device is divided 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 into one processing unit, or each unit may exist separately physically, or two or more units may be integrated into one unit, and the above-mentioned integrated units may adopt hardware It can also be implemented 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 each other, and are not used to limit the protection scope of the present application.

In the above-mentioned embodiments, the descriptions of each embodiment have their own emphases, and for parts that are not detailed or recorded in a certain embodiment, refer to the relevant descriptions of other embodiments.

Those skilled in the art can appreciate that the units described in conjunction with the embodiments disclosed herein, such as a controller, can be implemented with electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are executed by hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art may use different methods to implement the described functions for each specific application, but such implementation should not be regarded as exceeding the scope of the present application.

In the embodiments provided in this application, it should be understood that the disclosed device may be implemented in other ways. For example, the device/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. In another point, the mutual coupling or direct coupling or communication connection shown or discussed may be through some interfaces, and the indirect coupling or communication connection of devices or units may be in electrical, mechanical or other forms.

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

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

If the integrated modules are realized in the form of software function units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on such an understanding, the present application realizes all or part of the processes of the above-mentioned embodiments, and it can also be completed by instructing related hardware through a computer program. The computer program can be stored in a computer-readable storage medium. When the processor executes, the functions of the above-mentioned controller can be realized. 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. The computer-readable medium may include: any entity or device capable of carrying the computer program code, a recording medium, a USB flash drive, a removable hard disk, a magnetic disk, an optical disk, a computer memory, a read-only memory (Read-Only Memory, ROM, ROM), random access memory (Random Access Memory, RAM), electrical carrier signal, telecommunication signal, and software distribution medium, etc.

Furthermore, the embodiments shown in the drawings of the present application or the features of the various embodiments mentioned in this specification are not necessarily to be understood as independent embodiments from each other. Rather, each feature described in one example of an embodiment can be combined with one or more other desired features from other embodiments to produce other embodiments that are not described in words or with reference to the figures.

It should be noted that, in this document, the term "comprising", "comprising" or any other variation thereof is intended to cover a non-exclusive inclusion such that a process, method, article or apparatus comprising a set of elements includes not only those elements, It also includes other elements not expressly listed, or elements inherent in the process, method, article, or device. Without further limitations, an element defined by the phrase "comprising a ..." does not preclude the presence of additional identical elements in the process, method, article, or apparatus comprising that element.

The above are only specific embodiments of the present utility model, but the protection scope of the present utility model is not limited thereto. Any person familiar with the technical field can easily think of various equivalents within the technical scope disclosed by the utility model. These modifications or replacements should all be covered within the protection scope of the present utility model. Therefore, the protection scope of the present utility model should be based on the protection scope of the claims.

Claims (10)

1. The electric energy meter field inspection device is characterized by comprising a load control circuit, a current detector and a controller, wherein the load control circuit comprises an autotransformer and a plurality of load adjusting circuits consisting of relays and resistors;

the input end of the autotransformer is used for being connected with the live wire inlet end and the zero wire inlet end of the electric energy meter to be tested, and the output end of the autotransformer is connected with the input end of each load adjusting circuit respectively;

the input end of the load adjusting circuit is also connected with the output end of the controller, and the output end of the load adjusting circuit is connected with the live wire outlet end of the electric energy meter to be tested;

the input end of the current detector is connected with the live wire outlet end of the electric energy meter to be detected, and the output end of the current detector is connected with the input end of the controller.

2. The electric energy meter field inspection device of claim 1, wherein the electric energy meter field inspection device further comprises a metering unit;

the voltage acquisition end of the metering unit is connected with the live wire inlet end and the zero line inlet end of the electric energy meter to be measured, the current acquisition end of the metering unit is connected with the output end of the current detector, and the output end of the metering unit is connected with the input end of the controller.

3. The electric energy meter field inspection device of claim 2, wherein the electric energy meter field inspection device further comprises a pulse comparator;

the input end of the pulse comparator is respectively connected with the output end of the metering unit and the pulse output end of the electric energy meter to be tested, and the output end of the pulse comparator is connected with the input end of the controller.

4. The electric energy meter field inspection device of claim 1, wherein the resistance of the resistor in each of the load regulation circuits is different.

5. The electric energy meter field inspection device of claim 1, wherein the resistance of the resistor in each of the load regulation circuits is the same.

6. The electric energy meter field inspection device according to claim 1, wherein there are at least three of the load regulation circuits, and the resistances of the resistors in each of the load regulation circuits are partially the same.

7. The electric energy meter field inspection device of claim 1, wherein a plurality of shift buttons for controlling the opening and closing of different load adjusting circuits are further connected to the controller.

8. The electric energy meter field inspection device of claim 1, wherein a display screen is further connected to the controller.

9. The electric energy meter field inspection device of claim 1, wherein a memory is further coupled to the controller.

10. The electric energy meter field inspection device of claim 1, wherein the input terminal of the current detector is connected to the live wire outlet of the electric energy meter under test through a current clamp.

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