阅读说明：本技术 一种电能表误差自检测功能的测试装置 (Testing device with error self-detection function for electric energy meter ) 是由 陈叶 刘光界 曹敏 韩彤 王恩 廖耀华 许文龙 程富勇 朱梦梦 翟少磊 魏龄 于 2020-12-02 设计创作，主要内容包括：本申请提供一种电能表误差自检测功能的测试装置,包括功率源模块、标准表、故障模拟控制板、电能表核心板和PC机软件；PC机软件通过串口控制功率源模块产生电压信号和电流信号,并经过故障模拟控制板输入电能表核心板中,PC机软件通过串口控制所述故障模拟控制板产生故障模拟信号,并通过串口获取所述标准表的干扰信号数据,分析故障模拟信号输入后所述电能表核心板产生的计量偏差。本申请通过故障模拟控制板集成了多个故障模拟电路,分别能够模拟电能表核心板的计量电路部分出现的多种故障,以实现对电能表误差自检测功能的全面测试,并且能够评估出电能表误差自检测所能够检测到的误差精度,从而实现对电能表误差自检测功能的自动测试。(The application provides a testing device with an electric energy meter error self-detection function, which comprises a power source module, a standard meter, a fault simulation control board, an electric energy meter core board and PC (personal computer) software; the method comprises the steps that PC software controls a power source module to generate a voltage signal and a current signal through a serial port and inputs the voltage signal and the current signal into an electric energy meter core board through a fault simulation control board, the PC software controls the fault simulation control board to generate a fault simulation signal through the serial port, interference signal data of a standard meter are obtained through the serial port, and metering deviation generated by the electric energy meter core board after the fault simulation signal is input is analyzed. This application has integrateed a plurality of trouble analog circuit through the trouble analog control board, can simulate the multiple trouble that the measurement circuit part of electric energy meter core plate appears respectively to the realization is to the comprehensive test of electric energy meter error self-checking function, and can evaluate the error accuracy that the electric energy meter error self-checking can detect, thereby realizes the automatic test to electric energy meter error self-checking function.)

1. The utility model provides a testing arrangement of electric energy meter error self-checking function which characterized in that includes:

the system comprises a power source module, a standard meter, a fault simulation control board, an electric energy meter core board and PC software;

the power source module is used for generating a voltage signal and a current signal;

the standard table is used for measuring interference signal data;

the fault simulation control board is used for generating a fault simulation signal;

the electric energy meter core board is connected with the fault simulation control board through an interface;

the PC software controls the power source module to generate a voltage signal and a current signal through a serial port and inputs the voltage signal and the current signal into the electric energy meter core board through the fault simulation control board, the PC software controls the fault simulation control board to generate a fault simulation signal through the serial port, interference signal data of the standard meter are obtained through the serial port, and metering deviation generated by the electric energy meter core board after the fault simulation signal is input is analyzed.

2. The device for testing the error self-detection function of the electric energy meter according to claim 1, wherein the fault simulation board comprises a clock abnormality simulation circuit, a live line manganin open circuit simulation circuit, a live line manganin bypass simulation circuit, a zero line current transformer open circuit simulation circuit, a voltage sampling loop abnormality simulation circuit, a reference voltage abnormality simulation circuit, a communication interface circuit and a controller, and the controller receives the instruction of the PC software through the communication interface circuit and controls the on/off of the upper switch of each simulation circuit to complete the switching between different simulation circuits.

3. The testing device for the error self-detection function of the electric energy meter according to claim 2, wherein the clock abnormality simulation circuit simulates the clock abnormality of the metering circuit of the core board of the electric energy meter by controlling the switch K2 to close through the controller, and increasing a load at the output end of the crystal oscillator, so that the crystal oscillator cannot normally output.

4. The device for testing the error self-detection function of the electric energy meter according to claim 2, wherein the live-line manganin open circuit simulation circuit is turned off by the controller control switch K1, the output signal of the manganin MR5 is turned off, and the metering circuit of the core board of the electric energy meter cannot acquire a correct manganin current signal to simulate a live-line manganin open circuit.

5. The device as claimed in claim 2, wherein the live-line manganin bypass simulation circuit is closed through the controller control switch K3, live-line current divides a part of the manganin current from the branch where the switch K3 is located, and the manganin current signal collected by the metering circuit of the core board of the electric energy meter is reduced to simulate live-line manganin bypass.

6. The apparatus of claim 2, wherein the zero line current transformer bypass analog circuit controls the switch K7 to be turned on by the controller, the zero line current divides a part of the current passing through the branch of the switch K7 into current transformer currents, and the metering circuit of the core board of the electric energy meter collects a reduced current transformer current signal to simulate the zero line current transformer bypass.

7. The testing device for error self-testing of electric energy meter according to claim 2, wherein the switch K11 is controlled by the controller to open the analog circuit of the open current transformer, the output signal of the current transformer MT1 is turned off, the metering circuit of the core board of the electric energy meter cannot collect the correct current signal of the current transformer, and the analog current transformer is opened.

8. The testing device for the error self-detection function of the electric energy meter as claimed in claim 2, wherein the reference voltage abnormality simulating circuit is composed of a switch K14 and a load, and the reference voltage abnormality is simulated by applying a short-time load to the reference voltage of the metering circuit of the electric energy meter core board so that the reference voltage is changed.

9. The device as claimed in claim 2, wherein the voltage sampling loop abnormality simulation circuit is composed of a switch K13 and a load, when the switch K13 is closed, the load is connected, the amplitude of the voltage sampling signal of the voltage sampling loop changes, so that the voltage of the metering circuit of the core board of the electric energy meter changes, and the analog voltage sampling loop is abnormal.

10. The device for testing the error self-detection function of the electric energy meter according to any one of the claims 1-9, wherein the device can be further used for a voltage ramp-down test, a frequent up-down electric test and a leakage current test;

the power source module is controlled by the PC software to generate a voltage slow-rising and slow-falling signal; the frequent up-down electric test controls the power source module through the PC software to generate frequent up-down electric signals; the leakage current test controls the power source module through the PC software to generate different live wire currents and zero line currents, so that leakage current is generated.

Technical Field

The application relates to the technical field of testing of electric energy meter error self-detection functions, in particular to a testing device for an electric energy meter error self-detection function.

Background

The electric energy meter error self-detection function is that the intelligent electric energy meter is self-detection function through setting up self-detection chip, and this function provides standard source through self-detection chip inside, superposes with the actual current-voltage source that will sample, through ADC sampling behind the sensor, draws out from detected signal, calculates according to self-detected signal amplitude and phase place.

In the prior art, three detection methods are provided for the detection of an electric energy meter error self-detection function, the first method is a conventional electric energy meter calibration device which can detect the accuracy of an electric energy meter but cannot simulate the error change caused by the parameter change of an electric energy meter device; the second one is that a live wire and zero line current bypass circuit is built in the electric energy meter calibration stand, so that the change of manganin and current transformers can be simulated, but only live wire and zero line current bypasses can be simulated; the third is to connect the conducting wire in parallel at the inlet and outlet ends of the live wire and manually change the device parameters on the electric energy meter circuit to verify whether the electric energy meter has the error self-detection function, so that the change of all the device parameters and the error precision which can be detected can be simulated, but a large amount of labor cost and detection time are consumed, and the test process cannot be automatically completed. In addition, the detection data obtained by the testing method in the prior art is not standard, the change of all device parameters cannot be automatically simulated, the method is not suitable for electric energy meters with different specifications and models, and the applicability is poor.

Disclosure of Invention

The application provides a testing arrangement of electric energy meter error self-checking function to solve the automatic test process that can not accomplish that exists among the prior art, the detection data that obtains is nonstandard, can not simulate the change of all device parameters voluntarily, also can not adapt to the electric energy meter of different specification models, the relatively poor problem of suitability.

The application provides a testing arrangement of electric energy meter error self-checking function includes:

the system comprises a power source module, a standard meter, a fault simulation control board, an electric energy meter core board and PC software;

the power source module is used for generating a voltage signal and a current signal;

the standard table is used for measuring interference signal data;

the fault simulation control board is used for generating a fault simulation signal;

the electric energy meter core board is connected with the fault simulation control board through an interface;

the PC software controls the power source module to generate a voltage signal and a current signal through a serial port and inputs the voltage signal and the current signal into the electric energy meter core board through the fault simulation control board, the PC software controls the fault simulation control board to generate a fault simulation signal through the serial port, interference signal data of the standard meter are obtained through the serial port, and metering deviation generated by the electric energy meter core board after the fault simulation signal is input is analyzed.

In the preferred embodiment of this application, the trouble simulation board includes that clock anomaly analog circuit, live wire manganin open circuit analog circuit, live wire manganin bypass analog circuit, zero line current transformer open circuit analog circuit, voltage sampling return circuit anomaly analog circuit, reference voltage anomaly analog circuit and communication interface circuit and controller, the controller passes through communication interface circuit receives the instruction of PC software, and control the closing or the disconnection of switch in the realization of each analog circuit accomplish the switching between the different analog circuit.

In a preferred embodiment of the present application, the clock abnormality simulation circuit controls the switch K2 to be closed through the controller, and a load is added to an output terminal of the crystal oscillator, so that the crystal oscillator cannot normally output, and the clock abnormality of the metering circuit of the core board of the electric energy meter is simulated.

In the preferred embodiment of the present application, the live line manganin open circuit simulation circuit is turned off by the controller control switch K1, the output signal of the manganin MR5 is turned off, and the metering circuit of the core board of the electric energy meter cannot acquire a correct manganin current signal, so as to simulate a live line manganin open circuit.

In the preferred embodiment of this application, live wire copper manganese bypass analog circuit passes through controller control switch K3 closure, and the live wire electric current will be through the current shunting of switch K3 place branch road partly copper manganese electric current, the copper manganese electric current signal that the measurement circuit of electric energy meter core plate gathered reduces, simulates the live wire copper manganese bypass.

In the preferred embodiment of this application, zero line current transformer bypass analog circuit passes through controller control switch K7 is closed, and the zero line current will pass through the current-shunting of switch K7 place branch road partially flows out the current transformer current, the current transformer current signal that the measurement circuit of electric energy meter core board gathered reduces, simulates zero line current transformer bypass.

In a preferred embodiment of the present application, the current transformer open circuit analog circuit is turned off by the controller control switch K11, the output signal of the current transformer MT1 is turned off, the metering circuit of the core board of the electric energy meter cannot collect the correct current transformer current signal, and the analog current transformer is open.

In the preferred embodiment of the present application, the reference voltage abnormality simulation circuit is composed of a switch K14 and a load, and simulates a reference voltage abnormality by applying a short-time load to the reference voltage of the metering circuit of the electric energy meter core board, so that the reference voltage is changed.

In a preferred embodiment of the present application, the voltage sampling loop abnormality analog circuit is composed of a switch K13 and a load, when the switch K13 is closed, the load is connected, and the amplitude of the voltage sampling signal of the voltage sampling loop changes, so that the voltage of the metering circuit of the electric energy meter core board changes, and the analog voltage sampling loop is abnormal.

In the preferred embodiment of the present application, the detection apparatus can also be used for a voltage ramp-up and ramp-down test, a frequent up-down test and a leakage current test;

the power source module is controlled by the PC software to generate a voltage slow-rising and slow-falling signal; the frequent up-down electric test controls the power source module through the PC software to generate frequent up-down electric signals; the leakage current test controls the power source module through the PC software to generate different live wire currents and zero line currents, so that leakage current is generated.

Among the above-mentioned technical scheme, when the electric current of zero line end and live wire end is different, can produce the leakage current between live wire and the zero line, PC software obtains the leakage current that is surveyed electric energy meter core plate's measurement circuit through the serial ports and detects to the leakage current deviation that the evaluation electric energy meter core plate detected and actually produced, and give the precision.

The utility model provides a testing arrangement of electric energy meter error self-checking function compares in prior art, has following beneficial effect:

(1) the fault simulation test device integrates a plurality of fault simulation circuits such as a clock abnormity simulation circuit, a live wire manganin open circuit simulation circuit, a live wire manganin bypass simulation circuit, a zero line current transformer open circuit simulation circuit, a voltage sampling loop abnormity simulation circuit, a reference voltage abnormity simulation circuit and the like through a fault simulation control panel, and can simulate the faults such as clock abnormity, live wire manganin open circuit, live wire manganin bypass, zero line current transformer bypass, current transformer open circuit, reference voltage abnormity, voltage sampling loop abnormity and the like of a metering circuit part of an electric energy meter core board respectively so as to realize the comprehensive test of the electric energy meter error self-detection function, and the error precision which can be detected by the error self-detection of the electric energy meter can be evaluated, so that the automatic test of the error self-detection function of the electric energy meter is realized.

(2) This application is when simulation live wire manganin bypass and zero line current transformer bypass trouble, through the load resistance who inserts not tolerance, introduces different bypass current to the precision of the bypass current that evaluation analysis electric energy meter core plate's metering circuit can test.

(3) This application is through electric energy meter core plate, draws forth key signal on the interface to be connected with the trouble simulation control panel through this interface, consequently when electric energy meter core plate's interface is fixed, can satisfy the test to the error self test function of various different specification models electric energy meters.

Drawings

In order to more clearly explain the technical solution of the present application, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious to those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a block diagram of a testing device for an electric energy meter with self-error-detection function according to the present application;

FIG. 2 is a schematic circuit diagram of a fault simulation portion of the testing device for an electric energy meter error self-detection function according to the present application;

FIG. 3a is a schematic diagram of a clock abnormality simulation circuit in a fault simulation portion of a testing apparatus for an electric energy meter error self-detection function according to the present application;

FIG. 3b is a schematic diagram of a live line manganin open circuit simulation circuit in the fault simulation part of the testing device for the error self-detection function of the electric energy meter according to the present application;

FIG. 3c is a schematic diagram of a live line manganin bypass simulation circuit in the fault simulation part of the testing device for the error self-detection function of the electric energy meter according to the present application;

FIG. 3d is a schematic diagram of a zero line current transformer bypass analog circuit in the fault analog portion of the testing apparatus for an electric energy meter error self-detection function according to the present application;

FIG. 3e is a schematic diagram of an open circuit simulation circuit of a current transformer in a fault simulation portion of the testing apparatus for an electric energy meter error self-detection function according to the present application;

FIG. 3f is a schematic diagram of a reference voltage abnormality simulation circuit in the fault simulation portion of the testing apparatus for an electric energy meter error self-detection function according to the present application;

FIG. 3g is a schematic diagram of an abnormal analog circuit of a voltage sampling loop in a fault analog portion of the testing apparatus for an electric energy meter error self-detection function according to the present application;

FIG. 3h is a schematic diagram of a metering circuit in an electric energy meter core board of the testing apparatus for an electric energy meter error self-detection function according to the present application;

FIG. 4 is a schematic circuit diagram of a controller portion and a communication portion of a fault simulation control board of the testing device for an electric energy meter error self-detection function according to the present application.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

It should be noted that the brief descriptions of the terms in the present application are only for the convenience of understanding the embodiments described below, and are not intended to limit the embodiments of the present application. These terms should be understood in their ordinary and customary meaning unless otherwise indicated.

Examples

Referring to fig. 1, a block diagram of a testing apparatus for an electric energy meter error self-detection function is shown.

As shown in fig. 1, the present application provides a detection device for simulating an error self-detection function of an electric energy meter, including:

the system comprises a power source module, a standard meter, a fault simulation control board, an electric energy meter core board and PC software;

the power source module is used for generating a voltage signal and a current signal;

the standard table is used for measuring interference signal data;

the fault simulation control board is used for generating a fault simulation signal;

the electric energy meter core board is connected with the fault simulation control board through an interface;

the PC software controls the power source module to generate a voltage signal and a current signal through a serial port and inputs the voltage signal and the current signal into the electric energy meter core board through the fault simulation control board, the PC software controls the fault simulation control board to generate a fault simulation signal through the serial port, interference signal data of the standard meter are obtained through the serial port, and metering deviation generated by the electric energy meter core board after the fault simulation signal is input is analyzed.

As shown in fig. 2 and fig. 3a to fig. 3h, P1, P2, P3, P4, P5, P6 and P7 in the figures are interfaces between the fault simulation control board and the electric energy meter core board, the fault simulation control board and the electric energy meter core board are connected through a pin header and a seat header, and the interfaces are well defined so as to be capable of completing the test of the error self-detection function of the electric energy meters with different specifications and models.

As shown in fig. 2 to 4, in this embodiment, the fault simulation board includes a clock abnormal simulation circuit, a live line manganin open circuit simulation circuit, a live line manganin bypass simulation circuit, a zero line current transformer open circuit simulation circuit, a voltage sampling loop abnormal simulation circuit, a reference voltage abnormal simulation circuit, a communication interface circuit, and a controller, where the controller receives an instruction of the PC software through the communication interface circuit, and controls the on/off of the switches in the realization of the simulation circuits to complete switching between different simulation circuits.

As shown in fig. 4, in this embodiment, the controller is U1 in fig. 4, an STM32 chip is used, and the communication interface circuit is an RS485 communication interface circuit that is constructed by taking U4 as a core in fig. 4.

On the basis of the foregoing specific embodiment, further, the clock abnormality simulation circuit controls the switch K2 to be closed through the controller, and a load is added to an output terminal of the crystal oscillator, so that the crystal oscillator cannot normally output, thereby simulating a clock abnormality of the metering circuit of the core board of the electric energy meter.

As shown in fig. 3a, fig. 3h and fig. 2, in the present embodiment, the clock abnormality simulation circuit mainly includes a switch K2 and a load R1, and the load R1 is connected to the metering circuit of the core board of the electric energy meter through an interface P1, and is used for simulating the fault of the crystal oscillator abnormality and clock loss.

On the basis of the foregoing specific embodiment, further, the live line manganin open circuit simulation circuit is turned off by the controller control switch K1, the output signal on the manganin MR5 is turned off, and the metering circuit of the electric energy meter core board cannot acquire a correct manganin current signal to simulate a live line manganin open circuit.

As shown in fig. 2, fig. 3b, and fig. 3h, in this embodiment, the live line manganin open circuit analog circuit mainly includes a switch K1, the switch K1 is connected to the manganin MR5 and the anti-flying resistor MR3 in the metering circuit of the electric energy meter core board through an interface P2, in an initial state, the switch K1 is in a closed state, the metering circuit of the electric energy meter core board can normally collect the voltage (equivalently, the current passing through the electric energy meter) on the manganin MR5, and the simulation of the live line manganin open circuit fault needs to be implemented by controlling the switch K1 to be opened through the STM controller 32.

On the basis of the foregoing specific embodiment, further, the live line manganin bypass analog circuit is closed through the controller controlling the switch K3, the live line current divides the current passing through the branch where the switch K3 is located into a part of the manganin current, and the manganin current signal collected by the metering circuit of the core board of the electric energy meter is reduced to simulate a live line manganin bypass.

As shown in fig. 2, fig. 3c, and fig. 3h, in the present embodiment, the live-line manganin bypass analog circuit mainly includes switches K3, K4, K5, K6, R2, R3, R4, R5, and a live-line current detection circuit, wherein, K3 and R2 are connected in series to form a branch, K4 and R3 are connected in series to form a branch, K5 and R4 are connected in series to form a branch, K6 and R5 are connected in series to form a branch, the branches are connected in parallel and then connected in series with the live wire current detection circuit, and are connected with the manganin sampling resistor in the metering circuit of the electric energy meter core board through a P3 interface, R2, R3, R4 and R5 are connected with the manganin sampling resistor in the metering circuit of the electric energy meter core board, that is, MR5 in fig. 2 is used to cooperate to simulate the manganin bypass current of 1%, 2%, 5% and 10%, and the live wire current detection circuit is used to measure the value of the bypass current brought by the actual bypass and to evaluate how much bypass current the electric energy meter can detect the fault when added.

In particular, in this embodiment, only four loads with different resistances, namely, R2, R3, R4 and R5, are listed, but in actual use, the number of loads can be selected according to the magnitude of the bypass current to be simulated; for example, the value of the manganin sampling resistor, MR5, in the metering circuit of the watt-hour meter core board is 200u Ω, the bypass resistor is approximately equal to (1 ÷ 1%) × 200u Ω ═ 20m Ω when the bypass current is 1%, the bypass resistor is approximately equal to (1 ÷ 2%) × -200 u Ω ═ 10m Ω when the bypass current is 2%, the bypass resistor is approximately equal to (1 ÷ 5%) × -200 u Ω ═ 4m Ω when the bypass current is 5%, and the bypass resistor is approximately equal to (1 ÷ 10%) × -200 u Ω ÷ 2m Ω when the bypass current is 10%.

On the basis of the specific embodiment, furthermore, the zero line current transformer bypass analog circuit is closed through the controller control switch K7, zero line current divides a part of current transformer current through the current of the branch where the switch K7 is located, current transformer current signals collected by the metering circuit of the core board of the electric energy meter are reduced, and zero line current transformer bypass is simulated.

As shown in fig. 2, 3d and 3h, in the present embodiment, the neutral current transformer bypass analog circuit mainly includes switches K7, K8, K9, K10, R6, R7, R8, R9 and a neutral current detection circuit, wherein, K7 and R6 are connected in series to form a branch, K8 and R7 are connected in series to form a branch, K9 and R8 are connected in series to form a branch, K10 and R9 are connected in series to form a branch, the branches are connected in parallel and then connected in series with the zero line current detection circuit, and are connected with a current transformer in a metering circuit of the core board of the electric energy meter through a P4 interface, R6, R7, R8 and R9 are connected with the current transformer in the metering circuit of the core board of the electric energy meter, namely, the MT1 is matched with the current transformer to simulate the bypass current of 1%, 2%, 5% and 10% of the current transformer, and the zero line current detection circuit is used for measuring the value of the bypass current brought by the actual bypass and evaluating how much bypass current is added by the electric energy meter to detect the fault.

In particular, in this embodiment, only four loads with different resistances, i.e., R6, R7, R8, and R9, are listed, but the number of loads may be selected according to the magnitude of the bypass current to be simulated in actual use.

The primary impedance of the current transformer, i.e. MT1, in the metering circuit of an electric energy meter core board is 200u Ω, the shunt resistance is approximately equal to (1 ÷ 1%) 200u Ω -20 m Ω when the shunt current is 1%, 200u Ω -10 m Ω when the shunt current is 2%, 200u Ω -4 m Ω when the shunt current is 5%, and 200u Ω -2 m Ω when the shunt current is 10%.

On the basis of the foregoing specific embodiment, further, the current transformer open-circuit analog circuit is turned off by controlling the switch K11 through the controller, the output signal of the current transformer MT1 is turned off, the metering circuit of the core board of the electric energy meter cannot acquire a correct current signal of the current transformer, and the analog current transformer is open-circuit.

As shown in fig. 2, fig. 3e, and fig. 3h, the current transformer open-circuit simulation circuit mainly includes a switch K11, the switch K11 is connected to the current transformers MT1 and MR6 in the metering circuit of the electric energy meter core board through an interface P5, in an initial state, the switch K11 is in a closed state, the metering circuit of the electric energy meter core board can normally collect the voltage (equivalently, the current passing through the electric energy meter) passing through the current transformer MT1, and the simulation of the current transformer open-circuit fault is implemented by controlling the switch K11 to be opened through the controller STM 32.

On the basis of the above specific embodiment, further, the reference voltage abnormality simulation circuit is composed of a switch K14 and a load, and simulates a reference voltage abnormality by applying a short-time load to the reference voltage of the metering circuit of the electric energy meter core board so that the reference voltage is changed.

As shown in fig. 2, fig. 3f and fig. 3h, the reference voltage abnormality simulation circuit mainly includes a switch K11 and a load R11, the load R11 is connected to the MR13 reference voltage REF in the metering circuit of the power meter core board through an interface P7 and other loads, and when the switch K11 is closed, a short-time load R11 is applied to the reference voltage in the metering circuit of the power meter core board to simulate the reference voltage abnormality.

On the basis of the foregoing specific embodiment, further, the voltage sampling loop abnormality analog circuit is composed of a switch K13 and a load, when the switch K13 is closed, the load is connected, and the amplitude of the voltage sampling signal of the voltage sampling loop changes, so that the voltage of the metering circuit of the core board of the electric energy meter changes, and the analog voltage sampling loop is abnormal.

As shown in fig. 2, fig. 3g and fig. 3h, the voltage sampling loop abnormity analog circuit mainly comprises switches K12 and K13, a capacitor C1 and a load R10, wherein the K12 and the C1 are connected in series to form a branch, the K13 and the R10 are connected in series to form a branch, the two branches are connected in parallel and then connected with the voltage end of the metering circuit of the electric energy meter core board through the interface P6 and other loads, namely, the V3N and the V3P ends of the MU1 are connected with the load R10 when the K13 is closed, the voltage sampling signal amplitude is changed, the analog voltage sampling loop is abnormally broken, the other loads specifically comprise MR7, MR8, MR9, MR10 and MR11, two ends of the interface P6 are respectively a neutral line N end and a grounding AGND end, for example, the values of MR7, MR8, MR9 and MR10 are all 250K Ω, R10 is 250K Ω, MR11 is 1K Ω, for example, 220V AC voltage signal is input between the N end of the zero line and the AGND end of the ground, when the switch K13 is turned off, the output voltage of the V3P terminal of the MU1 is 220 × 1/1001 — 0.21978V; when the switch K13 is closed, the output voltage at the V3P terminal of MU1 is: (220 × 125/875) × (1/251) ═ 0.125V.

On the basis of the above specific embodiments, further, the detection device can be used for a voltage ramp-up and ramp-down test, a frequent up-down electrical test and a leakage current test;

the power source module is controlled by the PC software to generate a voltage slow-rising and slow-falling signal; the frequent up-down electric test controls the power source module through the PC software to generate frequent up-down electric signals; the leakage current test controls the power source module through the PC software to generate different live wire currents and zero line currents, so that leakage current is generated.

Among the above-mentioned technical scheme, when the electric current of zero line end and live wire end is different, can produce the leakage current between live wire and the zero line, PC software obtains the leakage current that is surveyed electric energy meter core plate's measurement circuit through the serial ports and detects to the leakage current deviation that the evaluation electric energy meter core plate detected and actually produced, and give the precision.

It should be particularly noted that in this embodiment, N in fig. 2 to 4 represents a zero line end, L represents a fire line end, all switches in this embodiment are relays, only a main circuit portion of the technical scheme of this application is described in this embodiment, and regarding other constituent components in the circuit diagram of this application and other circuit portions of the core board of the electric energy meter that are not described in this application, a person skilled in the art can obtain the circuit according to the technical scheme disclosed in this application in combination with common knowledge in the art, and therefore details are not described herein, but the related component components that are not described do not limit the protection scope of the technical scheme of this application.

The embodiments provided in the present application are only a few examples of the general concept of the present application, and do not limit the scope of the present application. Any other embodiments extended according to the scheme of the present application without inventive efforts will be within the scope of protection of the present application for a person skilled in the art.