Test platform for distribution network primary and secondary fusion complete switch equipment and test method thereof

Abstract

The invention discloses a test platform for distribution network primary and secondary fusion complete switch equipment and a test method thereof, and the test platform consists of a control cabinet, a power output cabinet, a primary test cabinet, a secondary test cabinet, a voltage-boosting and current-boosting cabinet and a test management system. The test management system comprises a complete test system, a primary test system and a secondary test system, and the test management system and the primary and secondary fusion complete equipment perform information interaction through a standard communication interface. According to the technical scheme, accuracy measurement of voltage, current, power, frequency and wave recording of complete equipment of a tested object is realized through an adjustable three-phase power supply. According to the technical scheme, the 10kV test voltage and the 800A alternating current can be applied at the same time, the implementation method of the network access detection test of the primary and secondary fusion complete switch equipment of the power distribution network can be solved, and a guarantee can be provided for safe operation of the power distribution network.

Description

Technical Field

[0001] The present invention belongs to the technical field of electrical testing, and more specifically, relates to a testing platform and a testing method thereof for a primary-secondary integrated switchgear set for a distribution network. Background Art

[0002] As the special work of primary and secondary integration of distribution network continues to advance, domestic power grid enterprises have completed and issued a number of equipment technical standards and test specifications, which effectively promoted the functional set and deep integration of distribution network equipment. Distribution network equipment testing is an important task to ensure equipment quality and improve the reliability of distribution network operation. Distribution equipment should also undergo various tests such as type test, factory test, network test and field test before being put into operation. There are a large number of distribution equipment and many models, and the corresponding distribution equipment testing also continues to explore and research high-quality and efficient testing technologies. However, due to the lack of special equipment, current testing is done with scattered testing instruments, and is done manually item by item, with a low level of automation; the test efficiency is low and cannot cope with the large number of testing needs of ring network boxes; the testers have high labor intensity, high professional requirements, and are prone to errors, so the objectivity of the test results is sometimes difficult to guarantee.

[0003] Therefore, it is necessary to develop a test method for the primary and secondary integrated equipment of the distribution network to meet the performance test and function test of the primary and secondary integrated equipment. Summary of the invention

[0004] Purpose of the invention: In order to solve the above-mentioned problems, the present invention summarizes a test platform and a test method for a primary-secondary integrated switchgear for a distribution network. The device and method can automatically complete a set of tests on the primary-secondary integrated switchgear, support instantaneous rise and fall of primary-side voltage and current, support reading the entire switch action time, support large current live cutting, and support triggering of ground fault waveforms.

[0005] Technical solution: In order to achieve the above-mentioned invention objectives, the present invention provides a test platform for distribution network primary and secondary integrated switchgear, which is applied to the testing of primary and secondary integrated switchgear, and is characterized in that: the test platform consists of a control cabinet, a power output cabinet, a primary test cabinet, a secondary test cabinet, a boost cabinet and a test management system, the test management system includes a complete test system, a primary test system and a secondary test system, and the test management system and the primary and secondary integrated equipment exchange information through a standard communication interface.

[0006] The test platform also includes a signal source, a power amplification system, a current booster, a step-up transformer, a standard transformer, a standard meter / recording device, a standard electric energy meter, an error calculator, communication equipment, a QR code scanner, a transformer calibrator, a transformer load box, a switch control device and a primary and secondary integrated distribution terminal detector.

[0007] The test management system includes tester authority management, test case configuration, storage, and call, automatic entry of sample information, function and performance automatic test process control, test result collection, comparison, and test report automatic generation control.

[0008] The signal source is used to generate standard output signals of current and voltage with adjustable amplitude, phase and frequency. It can realize steady-state output, state sequence and waveform inversion output according to test requirements. It can also accept the output signals of RTDS and other systems as the basic signal source to realize signal amplification output.

[0009] The power amplification system realizes power amplification of the signal output by the signal source. The power amplification system is composed of a voltage power amplification system and a current function amplification system. The amplified signal is used to drive the booster.

[0010] The current booster realizes isolation and amplification of current to simulate the primary current of the 10KV distribution line;

[0011] The step-up transformer realizes voltage isolation and amplification to simulate the primary voltage of the 10KV distribution line;

[0012] The standard transformer includes high-precision voltage and current transformers to achieve accurate sensing of primary-side current and voltage;

[0013] The standard meter / wave recording device is used to collect signals from standard transformers, realize accurate collection of output voltage, current amplitude and waveform, and use it as a comparison benchmark to test voltage, current accuracy, steady-state wave recording accuracy and transient wave recording accuracy;

[0014] Standard electric energy meter, which generates standard electric energy pulse and clock pulse as the inspection benchmark of line loss module;

[0015] The error calculator realizes the error calculation between the line loss module and the standard electric energy meter;

[0016] The communication equipment is used for internal communication within the system and for communication with the test product;

[0017] The QR code scanner is used to enter device information.

[0018] The transformer calibrator can test the transformer ratio difference and angle difference during the primary equipment test.

[0019] The transformer load box can realize load testing of the transformer during the primary equipment test;

[0020] The switch control device realizes the transmission test of the switch during the primary equipment test, and simultaneously realizes the test of the switch action time and the control loop current.

[0021] The primary and secondary integrated distribution terminal detector realizes the function and performance detection of the secondary equipment. The primary and secondary integrated distribution terminal detector includes: an electronic / electromagnetic standard source, an electronic / electromagnetic standard meter / recording device, an AC adjustable voltage source, a power supply / power consumption test device, a state quantity simulator, a control output indicator and an electronic load, wherein: the electronic / electromagnetic standard source: realizes the simulation of the output of the electronic or electromagnetic mutual inductor, so as to test the analog quantity acquisition of the distribution terminal; the electronic / electromagnetic standard meter / recording device: realizes the accurate acquisition of the output voltage, current amplitude and waveform, and uses it as a comparison benchmark to realize the test of the voltage, current accuracy, steady-state recording accuracy and transient recording accuracy; the AC adjustable voltage source: realizes the power supply and power supply impact test of the distribution terminal; the power supply / power consumption test device: realizes the test of the main and standby power and power consumption; the state quantity simulator: simulates the switch state to realize the remote signal acquisition function and performance test of the distribution terminal; the control output indicator: collects the control output of the distribution terminal to realize the test of the control output function and performance; the electronic load: realizes the load capacity test of the power supply of the distribution terminal.

[0022] A test method for a test platform for a primary and secondary integrated switchgear of a distribution network. The implementation of the test method requires a test management system, a signal source, a power amplification system, a current booster, a step-up transformer, a standard mutual inductor, a standard meter / wave recording device, a standard electric energy meter, an error calculator, a communication device, a QR code scanner, and a line loss module electric energy pulse;

[0023] The test method includes:

[0024] A. The QR code scanner scans the QR code on the nameplate of the complete set of equipment to read the information and create a test file;

[0025] B. The test management system exchanges information with the control equipment of the primary and secondary integrated equipment through the communication equipment. The test management system sends instructions to the signal source by configuring the test plan according to the test needs;

[0026] C. After receiving the digital voltage signal from the signal source, the power amplification system converts the digital signal into an analog voltage signal and outputs it to the step-up transformer, and then outputs the stepped-up analog voltage signal to the primary side voltage transformer of the primary-secondary integrated equipment;

[0027] D. After receiving the digital current signal from the signal source, the power amplification system converts the digital signal into an analog current signal and outputs it to the current booster, and then outputs the boosted analog current signal to the primary-side current transformer of the primary-secondary integrated equipment;

[0028] E. The test management system sends voltage and current control signals to the signal source simultaneously to control the voltage and current booster to apply voltage and current to the primary and secondary fusion equipment;

[0029] F. The standard transformer applies voltage and current to the primary and secondary integrated equipment for sampling and then inputs them into the standard meter / wave recording device. The standard meter / wave recording device realizes the accurate acquisition of the output voltage, current amplitude and waveform, and serves as the benchmark for comparison to realize the test of voltage, current accuracy, steady-state wave recording accuracy and transient wave recording accuracy to complete the transformer accuracy and wave recording function performance test;

[0030] G. The current and voltage signals collected by the standard electric energy meter from the standard mutual inductor are input together with the pulse signal output by the line loss module of the control equipment. After calculation, the error measurement of the line loss module can be realized.

[0031] Beneficial effects: Compared with the traditional technical solution, the beneficial effects of the present invention are as follows:

[0032] (1) This technical solution uses an adjustable three-phase power supply to accurately measure the voltage, current, power, frequency, and waveform of the complete set of equipment under test.

[0033] (2) The output power designed by this technical solution can reach 8000kVA, which can fully meet the test requirements of 10kV primary and secondary integrated switchgear.

[0034] (3) This technical solution can simultaneously output three-phase voltage and current with a phase angle difference of 0-360°, and can simulate single-phase faults and phase-to-phase faults, as well as intra-zone faults and extra-zone faults.

[0035] (4) This technical solution can simultaneously apply a 10kV test voltage and an 800A AC current, which can solve the implementation method of the network access detection test of the primary and secondary integrated switchgear of the distribution network, and can provide guarantee for the safe operation of the distribution network. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is a structural schematic diagram of the present invention.

[0037] Figure 2 This is a measurement flow chart of the complete set of equipment in the present invention.

[0038] Figure 3 This is a flow chart of primary equipment measurement in the present invention.

[0039] Figure 4 This is a flow chart of secondary equipment measurement in the present invention. DETAILED DESCRIPTION

[0040] The present technical solution is described in detail below through a best embodiment, but the protection scope of the present invention is not limited to the embodiment.

[0041] like Figure 1As shown, a test platform for a primary and secondary integrated switchgear of a distribution network is applied to the test of a primary and secondary integrated switchgear, including a control cabinet 1, a power output cabinet 2, a primary test cabinet 3, a booster cabinet 4 and a secondary test cabinet 5. The control cabinet 1 runs the primary and secondary integrated automatic test system software, and serves as the control center of the entire test system for test management, result comparison and report generation. The power output cabinet 2 contains instruments including a signal source, three current power amplifiers and a voltage power amplifier, which are used to realize the power amplification of the signal source output. The primary test cabinet 3 is composed of a transformer calibrator, a voltage, current, zero sequence, power supply load box and a switch control device, which is mainly aimed at the primary switch control, the accuracy of the primary switch and the test action voltage and action time. The booster cabinet 4 has three phases ABC, and there are a booster transformer and a current booster in the cabinet. The secondary measurement cabinet 5 is composed of a distribution terminal tester, a DC power supply, a programmable AC power supply and an electronic load, which can perform three remote controls, communication, logic judgment, power supply test and fault test of the distribution terminal.

[0042] The test management system and the primary and secondary fusion equipment exchange information via a standard communication interface;

[0043] The test platform also includes a signal source, a power amplification system, a current booster, a step-up transformer, a standard transformer, a standard meter / recording device, a standard electric energy meter, an error calculator, communication equipment, a QR code scanner, a transformer calibrator, a transformer load box, a switch control device and a primary and secondary integrated distribution terminal detector.

[0044] The test management system includes tester authority management, test case configuration, storage, and call, automatic entry of sample information, function and performance automatic test process control, test result collection, comparison, and test report automatic generation control.

[0045] The signal source is used to generate standard output signals of current and voltage with adjustable amplitude, phase and frequency. It can realize steady-state output, state sequence and waveform inversion output according to test requirements. It can also accept the output signals of RTDS and other systems as the basic signal source to realize signal amplification output.

[0046] The power amplification system realizes power amplification of the signal output by the signal source. The power amplification system is composed of a voltage power amplification system and a current function amplification system. The amplified signal is used to drive the booster.

[0047] The current booster realizes isolation and amplification of current to simulate the primary current of the 10KV distribution line;

[0048] The step-up transformer realizes voltage isolation and amplification to simulate the primary voltage of the 10KV distribution line;

[0049] The standard transformer includes high-precision voltage and current transformers to achieve accurate sensing of primary-side current and voltage;

[0050] The standard meter / wave recording device is used to collect signals from standard transformers, realize accurate collection of output voltage, current amplitude and waveform, and use it as a comparison benchmark to test voltage, current accuracy, steady-state wave recording accuracy and transient wave recording accuracy;

[0051] Standard electric energy meter, which generates standard electric energy pulse and clock pulse as the inspection benchmark of line loss module;

[0052] The error calculator realizes the error calculation between the line loss module and the standard electric energy meter;

[0053] The communication equipment is used for internal communication within the system and for communication with the test product;

[0054] The QR code scanner is used to enter device information;

[0055] The transformer calibrator can test the transformer ratio difference and angle difference during the primary equipment test.

[0056] The transformer load box can realize load testing of the transformer during the primary equipment test;

[0057] The switch control device realizes the transmission test of the switch during the primary equipment test, and simultaneously realizes the test of the switch action time and the control loop current.

[0058] The primary and secondary integrated power distribution terminal detector realizes the function and performance detection of the secondary equipment. The primary and secondary integrated power distribution terminal detector includes: electronic / electromagnetic standard source, electronic / electromagnetic standard table / recording device, AC adjustable voltage source, power supply / power consumption test device, state quantity simulator, control output indicator and electronic load, among which:

[0059] Electronic / electromagnetic standard source: to simulate the output of electronic or electromagnetic transformers, so as to test the analog quantity acquisition of power distribution terminals;

[0060] Electronic / electromagnetic standard meter / wave recording device: realize accurate acquisition of output voltage, current amplitude and waveform, and use it as a benchmark for comparison to test voltage, current accuracy, steady-state wave recording accuracy, and transient wave recording accuracy;

[0061] AC adjustable voltage source: to realize the power supply and power supply impact test of the power distribution terminal;

[0062] Power supply / power consumption test device: realize the test of main power supply, standby power supply and power consumption;

[0063] State quantity simulator: simulates the switch state to realize the remote signal collection function and performance test of the power distribution terminal;

[0064] Control output indicator: collects the control output of the power distribution terminal to test the control output function and performance;

[0065] Electronic load: to test the load capacity of the power distribution terminal power supply.

[0066] A test method for a test platform for a primary and secondary integrated switchgear of a distribution network. The implementation of the test method requires a test management system, a signal source, a power amplification system, a current booster, a step-up transformer, a standard mutual inductor, a standard meter / wave recording device, a standard electric energy meter, an error calculator, a communication device, a QR code scanner, and a line loss module electric energy pulse;

[0067] The test method includes:

[0068] A. The QR code scanner scans the QR code on the nameplate of the complete set of equipment to read the information and create a test file;

[0069] B. The test management system exchanges information with the control equipment of the primary and secondary integrated equipment through the communication equipment. The test management system sends instructions to the signal source by configuring the test plan according to the test needs;

[0070] C. After receiving the digital voltage signal from the signal source, the power amplification system converts the digital signal into an analog voltage signal and outputs it to the step-up transformer, and then outputs the stepped-up analog voltage signal to the primary side voltage transformer of the primary-secondary integrated equipment;

[0071] D. After receiving the digital current signal from the signal source, the power amplification system converts the digital signal into an analog current signal and outputs it to the current booster, and then outputs the boosted analog current signal to the primary-side current transformer of the primary-secondary integrated equipment;

[0072] E. The test management system sends voltage and current control signals to the signal source simultaneously to control the voltage and current booster to apply voltage and current to the primary and secondary fusion equipment;

[0073] F. The standard transformer applies voltage and current to the primary and secondary integrated equipment for sampling and then inputs them into the standard meter / wave recording device. The standard meter / wave recording device realizes the accurate acquisition of the output voltage, current amplitude and waveform, and serves as the benchmark for comparison to realize the test of voltage, current accuracy, steady-state wave recording accuracy and transient wave recording accuracy to complete the transformer accuracy and wave recording function performance test;

[0074] G. The current and voltage signals collected by the standard electric energy meter from the standard mutual inductor are input together with the pulse signal output by the line loss module of the control equipment. After calculation, the error measurement of the line loss module can be realized.

[0075] like Figure 2As shown in the figure, the measurement flow chart of the complete set of equipment, the QR code scanner scans the QR code on the nameplate of the complete set of equipment to read the information and then establish a test file. The test management system exchanges information with the control equipment of the primary and secondary integrated complete set of equipment through the communication equipment. The test management system sends instructions to the signal source according to the test needs. After the power amplifier system receives the digital voltage signal of the signal source, it converts the digital signal into an analog voltage signal and outputs it to the step-up transformer, and outputs the stepped-up analog voltage signal to the primary side voltage transformer of the primary and secondary integrated complete set of equipment. After the power amplifier system receives the digital current signal of the signal source, it converts the digital signal into an analog current signal and outputs it to the current booster, and outputs the stepped-up analog current signal to the primary side current transformer of the primary and secondary integrated complete set of equipment. The test management system sends voltage and current control signals to the signal source at the same time to control the booster to apply voltage and current to the primary and secondary integrated equipment. The standard transformer samples the voltage and current applied to the primary and secondary integrated equipment and inputs them into the standard meter / recording device. The standard meter / recording device realizes the accurate acquisition of the output voltage, current amplitude, and waveform, and uses it as a benchmark for comparison to realize the test of voltage, current accuracy, steady-state recording accuracy, and transient recording accuracy to complete the transformer accuracy and recording function performance test. The standard electric energy meter collects the current and voltage signals of the standard transformer and the pulse signal output by the line loss module of the control equipment, and inputs them into the error calculator. After calculation, the error measurement of the line loss module can be realized.

[0076] like Figure 3 As shown in the primary equipment measurement flow chart, after the transformer calibrator receives the standard transformer signal and the transformer signal of the tested equipment, it is used to test the accuracy of the primary voltage, current, zero-sequence voltage and zero-sequence current; the voltage transformer load box is used to add the required load to the voltage transformer according to actual needs to test the accuracy of the transformer under load, the current transformer load box is used to add the required load to the current transformer according to actual needs to test the accuracy of the transformer under load, and the zero-sequence transformer load box is used to add the required load to the zero-sequence transformer according to actual needs to test the accuracy of the transformer under load; the switch operating device is used to test the energy storage voltage, action time and action current of the primary switch, and can also control the primary switch action and the collection of position signals.

[0077] like Figure 4 As shown in the secondary equipment measurement flow chart, the test management system communicates with the primary and secondary integrated distribution terminal through the standard 104 protocol or 101 protocol. After the test management system inputs the analog voltage and current signal to the distribution terminal, it collects the standard meter readings and the terminal readings, automatically compares and records them, and determines whether the accuracy requirements are met; the test management system inputs the state sequence to the distribution terminal, and after the state sequence is flipped, it starts to record the SOE event message and switch quantity changes sent by the terminal, and makes a judgment on whether the predetermined result is met.

[0078] The test task plan of the primary and secondary fusion system is set through the test plan configured in advance by the test management system, and the corresponding primary and secondary fusion system test report template is generated. By manipulating the test management system, the configured specific test plan is opened and the test work is started. Different test items are tested using different test indicators. After the test management system is started, the output format of the voltage and current signals of the primary system is the Ethernet data frame format that meets the standard, and the information of the secondary system protection equipment is output in the form of a message. When the test system can receive the message information of the primary system, it parses the action signal of the secondary system protection equipment, and tests and verifies the basic function test of the primary and secondary fusion system and the interface communication performance test in the test plan, thereby forming a closed-loop test system for the primary and secondary fusion system of the distribution network. During the test process of the test platform, the abnormal conditions that may exist in the test process are analyzed and judged. If there are abnormal phenomena in the test process, the previous test process needs to be adjusted, and the previous test process is executed again after the abnormality is eliminated. When it is detected that the test task has been completed, the test platform control center reads and saves the test result data, and determines whether the current test result meets the qualified standard. Finally, the test result is written into the prepared report template to generate a test report that meets the requirements.

Claims

1. A test platform for primary and secondary integrated switchgear of distribution network, which is applied to the test of primary and secondary integrated switchgear, and is characterized by: The test platform is composed of a control cabinet, a power output cabinet, a primary test cabinet, a secondary test cabinet, a boost cabinet and a test management system. The test management system includes a complete set of test systems, a primary test system and a secondary test system. The test management system and the primary and secondary integrated complete set of equipment exchange information through a standard communication interface. The test platform also includes a signal source, a power amplification system, a current booster, a step-up transformer, a standard transformer, a standard meter / recording device, a standard electric energy meter, an error calculator, communication equipment, a QR code scanner, a transformer calibrator, a transformer load box, a switch control device and a primary and secondary integrated distribution terminal detector.

2. A test platform for a primary and secondary integrated switchgear for a distribution network according to claim 1, characterized in that: The test management system includes tester authority management, test case configuration, storage, and call, automatic entry of sample information, function and performance automatic test process control, test result collection, comparison, and test report automatic generation control.

3. A test platform for a primary and secondary integrated switchgear for a distribution network according to claim 1, characterized in that: The signal source is used to generate standard output signals of current and voltage with adjustable amplitude, phase and frequency. It can realize steady-state output, state sequence and waveform inversion output according to test requirements. It can also accept the output signals of RTDS and other systems as the basic signal source to realize signal amplification output. The power amplification system realizes power amplification of the signal output by the signal source. The power amplification system is composed of a voltage power amplification system and a current function amplification system. The amplified signal is used to drive the booster. The current booster realizes isolation and amplification of current to simulate the primary current of the 10KV distribution line; The step-up transformer realizes voltage isolation and amplification to simulate the primary voltage of the 10KV distribution line; The standard transformers include high-precision voltage and current transformers to achieve accurate sensing of primary-side current and voltage; The standard meter / wave recording device is used to collect signals from standard transformers, realize accurate collection of output voltage, current amplitude and waveform, and use it as a comparison benchmark to test voltage, current accuracy, steady-state wave recording accuracy and transient wave recording accuracy; Standard electric energy meter, which generates standard electric energy pulse and clock pulse as the inspection benchmark of line loss module; The error calculator realizes the error calculation between the line loss module and the standard electric energy meter; The communication equipment is used for internal communication within the system and for communication with the test product; The QR code scanner is used to enter device information; The transformer calibrator can test the transformer ratio difference and angle difference during the primary equipment test. The transformer load box can realize load testing of the transformer during the primary equipment test; The switch control device realizes the transmission test of the switch during the primary equipment test, and simultaneously realizes the test of the switch action time and the control loop current.

4. A test platform for a primary and secondary integrated switchgear for a distribution network according to claim 1, characterized in that: The primary and secondary integrated power distribution terminal detector realizes the function and performance detection of the secondary equipment. The primary and secondary integrated power distribution terminal detector includes: electronic / electromagnetic standard source, electronic / electromagnetic standard table / recording device, AC adjustable voltage source, power supply / power consumption test device, state quantity simulator, control output indicator and electronic load, among which: Electronic / electromagnetic standard source: to simulate the output of electronic or electromagnetic transformers, so as to test the analog quantity acquisition of power distribution terminals; Electronic / electromagnetic standard meter / wave recording device: realize accurate acquisition of output voltage, current amplitude and waveform, and use it as a benchmark for comparison to test voltage, current accuracy, steady-state wave recording accuracy, and transient wave recording accuracy; AC adjustable voltage source: to realize the power supply and power supply impact test of the power distribution terminal; Power supply / power consumption test device: realize the test of main power supply, standby power supply and power consumption; State quantity simulator: simulates the switch state to realize the remote signal collection function and performance test of the power distribution terminal; Control output indicator: collects the control output of the power distribution terminal to test the control output function and performance; Electronic load: to test the load capacity of the power distribution terminal power supply.

5. A test method for a test platform for a complete set of primary and secondary integrated switchgear for a distribution network, characterized in that: The implementation of the test method requires a test management system, signal source, power amplifier system, current booster, step-up transformer, standard mutual inductor, standard meter / wave recording device, standard energy meter, error calculator, communication equipment, QR code scanner and line loss module energy pulse; The test method includes: A. The QR code scanner scans the QR code on the nameplate of the complete set of equipment to read the information and create a test file; B. The test management system exchanges information with the control equipment of the primary and secondary integrated equipment through the communication equipment. The test management system sends instructions to the signal source by configuring the test plan according to the test needs; C. After receiving the digital voltage signal from the signal source, the power amplification system converts the digital signal into an analog voltage signal and outputs it to the step-up transformer, and then outputs the stepped-up analog voltage signal to the primary side voltage transformer of the primary-secondary integrated equipment; D. After receiving the digital current signal from the signal source, the power amplification system converts the digital signal into an analog current signal and outputs it to the current booster, and then outputs the boosted analog current signal to the primary-side current transformer of the primary-secondary integrated equipment; E. The test management system sends voltage and current control signals to the signal source simultaneously to control the voltage and current booster to apply voltage and current to the primary and secondary fusion equipment; F. The standard transformer applies voltage and current to the primary and secondary integrated equipment for sampling and then inputs them into the standard meter / wave recording device. The standard meter / wave recording device realizes the accurate acquisition of the output voltage, current amplitude and waveform, and serves as the benchmark for comparison to realize the test of voltage, current accuracy, steady-state wave recording accuracy and transient wave recording accuracy to complete the transformer accuracy and wave recording function performance test; G. The current and voltage signals collected by the standard electric energy meter from the standard mutual inductor are input together with the pulse signal output by the line loss module of the control equipment. After calculation, the error measurement of the line loss module can be realized.

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