Metering performance evaluation testing device of three-phase high-voltage electric energy metering device

Abstract

The invention provides a metering performance evaluation test device for a three-phase high-voltage electric energy metering device. The device comprises a three-phase integrated self-boosting and self-current-rising standard device, a three-phase voltage regulation control power supply and a control unit, the three-phase integrated self-boosting and self-current-rising standard device comprises a boosting circuit, a current rising circuit, a three-phase self-boosting standard voltage transformer and a three-phase self-boosting standard current transformer; the control unit is composed of a three-phase balance voltage regulating source, a three-phase balance current regulating source, a three-phase voltage load, a three-phase current load, a three-phase intelligent mutual inductor calibrator, a program control circuit and a data processing and analyzing unit. According to the invention, the rated voltage is applied to the three phases at the same time, and the three-phase current transformer is subjected to up-current verification at the same time; the rated current is applied to the three phases simultaneously, the three-phase voltage transformer is subjected to boost verification simultaneously, and the speed and accuracy of error verification of the three-phase combined transformer are improved.

Description

Technical Field

[0001] The present disclosure relates to the field of three-phase high-voltage electric energy metering device inspection, and in particular to a three-phase high-voltage electric energy metering device metering performance evaluation and testing device. Background Art

[0002] In the distribution network of 35kV and below, three-phase combination transformers are key power measurement equipment and are widely used for gateway power metering. The quality and error of these transformers are directly related to the stable operation and metering accuracy of the distribution system.

[0003] In the related art, three-phase combination transformers are usually tested by single-phase verification and separate verification of current and voltage transformers. However, since the three-phase combination transformer combines the current transformer and the voltage transformer in a small space, there is electromagnetic influence between each mutual inductance unit, which makes it difficult to accurately reflect the actual error. In contrast, the traditional three-phase separation component verification method requires a large number of discrete devices and complex wiring, which is inefficient and prone to errors. Therefore, how to evaluate the performance of the three-phase combination transformer more accurately, conveniently and quickly has always been a concern of the industry. Summary of the invention

[0004] The embodiments of the present disclosure at least provide a three-phase high-voltage electric energy metering device metering performance evaluation test device, which can apply rated voltage to the three phases at the same time to simultaneously perform current boost verification on the three-phase current transformers; apply rated current to the three phases at the same time to simultaneously perform voltage boost verification on the three-phase voltage transformers, thereby improving the speed and accuracy of error verification of the three-phase combination transformer.

[0005] The disclosed embodiment provides a three-phase high-voltage electric energy metering device metering performance evaluation test device, including a three-phase integrated self-voltage and self-current standard device, a three-phase voltage regulation control power supply and a control unit;

[0006] The three-phase integrated self-boosting and self-current boosting standard device comprises a boosting circuit, a current boosting circuit, a three-phase self-boosting standard voltage transformer and a three-phase self-boosting standard current transformer. The three-phase voltage regulation control power supply is sequentially connected to the boosting circuit, the three-phase self-boosting standard voltage transformer, the current boosting circuit and the three-phase self-boosting standard current transformer. The boosting circuit comprises a first three-phase voltage regulator and a three-phase booster connected in sequence, and the three-phase booster is connected to the three-phase voltage regulation control power supply; the current boosting circuit comprises a second three-phase voltage regulator and a three-phase current booster connected in sequence, and the three-phase current booster is connected to the three-phase voltage regulation control power supply; the three-phase combination transformer to be tested is connected between the three-phase self-boosting standard voltage transformer and the three-phase self-boosting standard current transformer; the three-phase integrated self-boosting and self-current boosting standard device provides a three-phase standard voltage signal, a three-phase standard current signal, a three-phase high-voltage power supply and a three-phase high-voltage current power supply for the calibration of the three-phase combination transformer to be tested;

[0007] The control unit is composed of a three-phase balanced voltage regulating source, a three-phase balanced current regulating source, a three-phase voltage load, a three-phase current load, a three-phase intelligent transformer tester, a programmable circuit and a data processing and analysis unit to achieve balanced regulation of three-phase voltage and current, switching of three-phase voltage and current loads, measurement of three-phase voltage and current signals, and data processing and analysis.

[0008] In a possible implementation manner, the three-phase voltage regulation control power supply includes three phases A, B, and C.

[0009] The three-phase voltage regulating control power supply A, B, C phases are respectively connected to the first interfaces of the A, B, C phases on the primary side of the three-phase booster, and the second interfaces of the A, B, C phases on the primary side of the three-phase booster are respectively grounded;

[0010] The first interfaces of the A, B, and C phases on the secondary side of the three-phase booster are respectively connected to the A, B, and C phase interfaces of the first three-phase voltage regulator, and the second interfaces of the A, B, and C phases on the secondary side of the three-phase booster are respectively grounded.

[0011] In a possible implementation manner, when the three-phase combination transformer to be tested is a V-type connected three-phase combination transformer, the three-phase voltage regulating control power supply phase A is connected to the first interface of the primary side phase A of the three-phase current booster, the three-phase voltage regulating control power supply phase C is connected to the first interface of the primary side phase C of the three-phase current booster, and the second interfaces of the primary side phases A and C of the three-phase current booster are respectively connected to the output terminals of the phases A and C of the three-phase self-boosting standard current transformer; the first interfaces of the phases A, B, and C of the secondary side of the three-phase current booster are respectively connected to the interfaces of the phases A, B, and C of the second three-phase voltage regulator, and the second interfaces of the phases A, B, and C of the secondary side of the three-phase current booster are respectively grounded;

[0012] When the three-phase combination transformer to be tested is a Y-type connected three-phase combination transformer, the three-phase voltage regulating control power supply A, B, and C phases are respectively connected to the first interfaces of the primary side A, B, and C phases of the three-phase current booster; the second interfaces of the primary side A, B, and C phases of the three-phase current booster are respectively connected to the output ends of the A, B, and C phases of the three-phase self-boosting standard current transformer; the first interfaces of the A, B, and C phases on the secondary side of the three-phase current booster are respectively connected to the A, B, and C phase interfaces of the second three-phase voltage regulator, and the second interfaces of the A, B, and C phases on the secondary side of the three-phase current booster are respectively grounded.

[0013] In a possible implementation, when the three-phase combination transformer to be tested is a V-type connected three-phase combination transformer, the three-phase voltage regulating control power supply phase A is connected to the phase A of the primary winding of the three-phase self-boosting standard voltage transformer, and the three-phase voltage regulating control power supply phase C is connected to the phase C of the primary winding of the three-phase self-boosting standard voltage transformer; the three-phase voltage regulating control power supply phase B is connected to the x0 interface of the primary winding of the three-phase self-boosting standard voltage transformer; the secondary winding interface of the three-phase self-boosting standard voltage transformer is connected to the voltage calibrator, wherein the a0 interface of the secondary winding is respectively connected to the a0 interface and the Ka interface of the voltage calibrator; the xa interface of the secondary winding is respectively connected to the xa interface of the voltage calibrator, the xc interface of the secondary winding and the ground wire; the c0 interface of the secondary winding is respectively connected to the c0 interface and Kc of the voltage calibrator;

[0014] When the three-phase combination transformer to be tested is a Y-type connected three-phase combination transformer, the three-phase voltage regulating control power supply A, B, and C phases are respectively connected to the A, B, and C phases of the primary winding of the three-phase self-boosting standard voltage transformer; the x0 interface of the primary winding of the three-phase self-boosting standard voltage transformer is grounded; the secondary winding interface of the three-phase self-boosting standard voltage transformer is connected to the voltage calibrator, wherein the a0 interface of the secondary winding is connected to the a0 interface and the Ka interface of the voltage calibrator; the xa interface of the secondary winding is respectively connected to the xb interface, the xc interface and the ground wire of the secondary winding; the b0 interface of the secondary winding is respectively connected to the b0 interface and the Kb interface of the voltage calibrator; the c0 interface of the secondary winding is respectively connected to the c0 interface and the Kc interface of the voltage calibrator; the xc interface of the secondary winding is respectively connected to the xa interface, the xc interface and the ground wire of the voltage calibrator.

[0015] In a possible implementation, when the three-phase combination transformer to be tested is a V-type connected three-phase combination transformer, the three-phase voltage regulating control power supply phase A is connected to the phase A of the primary winding of the three-phase self-boosting standard current transformer, and the three-phase voltage regulating control power supply phase C is connected to the phase C of the primary winding of the three-phase self-boosting standard current transformer; the secondary winding interface of the three-phase self-boosting standard current transformer is connected to the current calibrator, wherein the ak2 interface of the secondary winding is connected to the T0a interface of the current calibrator; the ak1 interface of the secondary winding is connected to the Ka interface of the current calibrator; the ck2 interface of the secondary winding is connected to the T0c interface of the current calibrator; the ck1 interface of the secondary winding is connected to the Kc interface of the current calibrator;

[0016] When the three-phase combination transformer to be tested is a Y-type connected three-phase combination transformer, the three-phase voltage regulating control power supply A, B, and C phases are respectively connected to the A, B, and C phases of the primary winding of the three-phase self-boosting standard current transformer; the interface of the secondary winding of the three-phase self-boosting standard current transformer is connected to the current calibrator, wherein the ak2 interface of the secondary winding is connected to the T0a interface of the current calibrator; the ak1 interface of the secondary winding is connected to the Ka interface of the current calibrator; the bk2 interface of the secondary winding is connected to the T0b interface of the current calibrator; the bk1 interface of the secondary winding is connected to the Kb interface of the current calibrator; the ck2 interface of the secondary winding is connected to the T0c interface of the current calibrator; and the ck1 interface of the secondary winding is connected to the Kc interface of the current calibrator.

[0017] In a possible implementation manner, when the three-phase combination transformer to be tested is a V-type connected three-phase combination transformer, the three-phase voltage regulating control power supply A, B, and C phases are respectively connected to the A, B, and C phases of the primary winding at the voltage end of the three-phase combination transformer to be tested; the secondary winding interface of the three-phase combination transformer to be tested is connected to the voltage calibrator; wherein the secondary winding interface a of the three-phase combination transformer to be tested is connected to the voltage calibrator Da; the secondary winding interface c of the three-phase combination transformer to be tested is connected to the voltage calibrator Dc; the secondary winding interface b of the three-phase combination transformer to be tested is grounded;

[0018] Phase A of the three-phase voltage regulating control power supply is connected to phase A of the primary winding at the current end of the three-phase combination transformer to be tested, and phase C of the three-phase voltage regulating control power supply is connected to phase B of the primary winding at the current end of the three-phase combination transformer to be tested; the interface of the secondary winding at the current end of the three-phase combination transformer to be tested is connected to the three-phase self-boosting standard current transformer and the current calibrator; wherein, the secondary winding as1 interface of the three-phase combination transformer to be tested is respectively connected to the ak1 interface of the three-phase self-boosting standard current transformer and the Ka interface of the current calibrator; the secondary winding as2 interface of the three-phase combination transformer to be tested is connected to resistor Za and then grounded; the secondary winding cs1 interface of the three-phase combination transformer to be tested is respectively connected to the ck1 interface of the three-phase self-boosting standard current transformer and the Kc interface of the current calibrator; the secondary winding cs2 interface of the three-phase combination transformer to be tested is connected to resistor Zc and then grounded.

[0019] In a possible implementation, when the three-phase combination transformer to be tested is a Y-type connected three-phase combination transformer, the three-phase voltage regulating control power supply A, B, and C phases are respectively connected to the A, B, and C interfaces of the primary winding at the voltage end of the three-phase combination transformer to be tested; the secondary winding interface of the three-phase combination transformer to be tested is connected to the voltage calibrator; wherein the secondary winding interface a of the three-phase combination transformer to be tested is connected to the voltage calibrator Da; the secondary winding interface b of the three-phase combination transformer to be tested is connected to the voltage calibrator Db; the secondary winding interface c of the three-phase combination transformer to be tested is connected to the voltage calibrator Dc;

[0020] The three-phase voltage regulating control power supply A, B, C phases are respectively connected to the A, B, C phases of the primary winding of the current end of the three-phase combination transformer to be tested; the secondary winding interface of the current end of the three-phase combination transformer to be tested is respectively connected to the three-phase self-boosting standard current transformer and the current calibrator; wherein, the secondary winding as1 interface of the three-phase combination transformer to be tested is respectively connected to the ak1 interface of the three-phase self-boosting standard current transformer and the Ka interface of the current calibrator; the secondary winding as2 interface of the three-phase combination transformer to be tested is connected to the resistor Z a and then connected to the ground wire; the secondary winding bs1 interface of the three-phase combination transformer to be tested is respectively connected to the bk1 interface of the three-phase self-boosting standard current transformer and the Kb interface of the current calibrator; the secondary winding bs2 interface of the three-phase combination transformer to be tested is connected to the ground wire after connecting the resistor Zb; the secondary winding cs1 interface of the three-phase combination transformer to be tested is respectively connected to the ck1 interface of the three-phase self-boosting standard current transformer and the Kc interface of the current calibrator; the secondary winding cs2 interface of the three-phase combination transformer to be tested is connected to the resistor Zc and then grounded.

[0021] In a possible implementation, the three-phase balanced voltage regulating source is connected to three standard voltage sources; the three-phase balanced current regulating source is connected to three standard current sources; and the three-phase intelligent transformer tester is connected to the three-phase combined transformer to be tested.

[0022] In a possible implementation, the three-phase voltage load is used to simulate a three-phase voltage load; the three-phase current load is used to simulate a three-phase current load; the programmable circuit is used to control the operation of a first three-phase voltage regulator, a second three-phase voltage regulator, a three-phase booster, a three-phase current booster, a three-phase self-boosting standard voltage transformer, and a three-phase self-boosting standard current transformer; the data processing and analysis unit receives data from the first three-phase voltage regulator, the second three-phase voltage regulator, the three-phase booster, the three-phase current booster, the three-phase self-boosting standard voltage transformer, and the three-phase self-boosting standard current transformer, and performs data processing and analysis.

[0023] In a possible embodiment, the device also includes a test placement table, which is fixedly arranged on one side of the three-phase high-voltage electric energy metering device metering performance evaluation test device; high-voltage insulators are arranged on the test placement table and infrared counter-radiation grids are arranged at the four corners of the test placement table. When an object is identified to pass through the infrared counter-radiation grid, the three-phase high-voltage electric energy metering device metering performance evaluation test device cuts off the three-phase voltage regulation control power supply and gives an alarm prompt.

[0024] The three-phase high-voltage electric energy metering device metering performance evaluation test device provided in the embodiment of the present disclosure adopts a three-phase voltage regulator, a three-phase booster, a three-phase current booster, a three-phase self-boosting standard voltage transformer, and a three-phase self-boosting standard current transformer, which are integrated in an inflatable shell according to the above-mentioned connection method to form a three-phase integrated boost and current standard device, and provide a three-phase standard voltage signal, a three-phase standard current signal, a three-phase high-voltage power supply, and a three-phase high-voltage current power supply for the calibration of the three-phase combination transformer. Since the positions and wiring of each functional module inside the three-phase high-voltage electric energy metering device metering performance evaluation test device are fixed, and the interference between them is fixed, the relative distance between each module and the uncertainty caused by the wiring can be reduced, and the accuracy of the test can be improved; the calibration of the combination transformer, voltage transformer and single-phase current transformer can be realized by using simple test wiring and operation.

[0025] In order to make the above-mentioned objectives, features and advantages of the present disclosure more obvious and easy to understand, preferred embodiments are specifically cited below and described in detail with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the following briefly introduces the drawings required to be cited in the embodiments. The drawings herein are incorporated into the specification and constitute a part of the specification. These drawings illustrate embodiments consistent with the present disclosure and are used together with the specification to illustrate the technical solutions of the present disclosure. It should be understood that the following drawings only illustrate certain embodiments of the present disclosure and should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0027] Figure 1 A schematic diagram of a three-phase high-voltage electric energy metering device metering performance evaluation test device provided by an embodiment of the present disclosure is shown;

[0028] Figure 2 A schematic diagram showing the circuit connection of a boost circuit in a three-phase high-voltage electric energy metering device metering performance evaluation and testing device provided by an embodiment of the present disclosure is shown;

[0029] Figure 3A schematic diagram showing the circuit connection of a three-phase high-voltage electric energy metering device metering performance evaluation test device provided by an embodiment of the present disclosure when the three-phase combined mutual inductor to be tested is V-connected;

[0030] Figure 4 A schematic diagram showing the circuit connection of a three-phase high-voltage electric energy metering device metering performance evaluation test device provided by an embodiment of the present disclosure when the three-phase combined mutual inductor to be tested is Y-connected is shown. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical scheme and advantages of the embodiments of the present disclosure clearer, the technical scheme in the embodiments of the present disclosure will be clearly and completely described below in conjunction with the drawings in the embodiments of the present disclosure. Obviously, the described embodiments are only part of the embodiments of the present disclosure, rather than all of the embodiments. The components of the embodiments of the present disclosure generally described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present disclosure provided in the drawings is not intended to limit the scope of the present disclosure for protection, but merely represents the selected embodiments of the present disclosure. Based on the embodiments of the present disclosure, all other embodiments obtained by those skilled in the art without making creative work belong to the scope of protection of the present disclosure.

[0032] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0033] The term "and / or" herein only describes an association relationship, indicating that three relationships may exist. For example, A and / or B may represent the following three situations: A exists alone, A and B exist at the same time, and B exists alone. In addition, the term "at least one" herein represents any combination of at least two of any one or more of a plurality of. For example, including at least one of A, B, and C may represent including any one or more elements selected from the set consisting of A, B, and C.

[0034] In distribution networks with voltage levels of 35kV and below, three-phase combination transformers are widely used in gateway electricity metering. Their quality performance and error characteristics directly affect the stable operation and metering accuracy of the distribution network system. How to calibrate them accurately, conveniently and quickly is particularly urgent and important.

[0035] In February 2020, the State Administration for Market Regulation issued a new version of the "Three-Phase Combination Instrument Transformer" Metrology Verification Regulations, numbered JJG1165-2019, requiring all regions to implement mandatory verification on March 31, 2020; this standard and the mandatory inspection regulations JJG1189.3-2022 "Measuring Transformers Part 3: Power Current Transformers", JJG1189.4-2022 "Measuring Transformers Part 4: Power Voltage Transformers" and JG313-2010 "Verification Regulations for Current Transformers for Measuring" and JJG314-2010 "Verification Regulations for Voltage Transformers for Measuring" constitute a complete system for power transformer verification and traceability, ensuring the safe, stable, accurate and reliable operation of transformers used for trade electricity settlement, and are an important part of the national mandatory inspection system.

[0036] After research, it was found that both the three-phase combination transformer manufacturers and various testing departments mostly use single-phase verification and separate verification of current and voltage transformers for factory inspection, acceptance, initial verification and periodic verification. The three-phase combination transformer combines the current transformer and the voltage transformer in a small space. There is electromagnetic influence between each transformer unit, and the single-phase verification and separate verification methods cannot truly reflect the error characteristics of the three-phase combination transformer under actual working conditions. Compared with the traditional three-phase separation component verification method, there are many discrete devices, the test wiring is extremely complicated, the detection efficiency is low, and it is easy to make mistakes. The verification requires more than a dozen test equipment such as three-phase voltage source, three-phase current source, three-phase boost power supply, three-phase high-voltage boost power supply, three-phase standard voltage transformer, three-phase high-voltage standard current transformer, three-phase voltage, current load box, three-phase calibration instrument, etc., lacking a fusion and integrated efficient test platform.

[0037] Based on the above research, a three-phase high-voltage electric energy metering device metering performance evaluation test device is provided in an embodiment of the present disclosure, including a three-phase integrated self-boosting and self-current boosting standard device, a three-phase voltage regulating control power supply and a control unit; the three-phase integrated self-boosting and self-current boosting standard device includes a boosting circuit, a current boosting circuit, a three-phase self-boosting standard voltage transformer and a three-phase self-boosting standard current transformer, and the three-phase voltage regulating control power supply is sequentially connected to the boosting circuit, the three-phase self-boosting standard voltage transformer, the current boosting circuit and the three-phase self-boosting standard current transformer, the boosting circuit includes a first three-phase voltage regulator and a three-phase booster connected in sequence, and the three-phase booster is connected to the three-phase voltage regulating control power supply; the current boosting circuit includes a second three-phase voltage regulator and a three-phase current booster connected in sequence, The three-phase current booster is connected to a three-phase voltage regulating control power supply; the three-phase combination transformer to be tested is connected between the three-phase self-boosting standard voltage transformer and the three-phase self-boosting standard current transformer; the three-phase integrated self-boosting and self-current standard device provides three-phase standard voltage signals, three-phase standard current signals, three-phase high-voltage power supply and three-phase high-voltage current power supply for the calibration of the three-phase combination transformer to be tested; the control unit is composed of a three-phase balanced voltage regulating source, a three-phase balanced current regulating source, a three-phase voltage load, a three-phase current load, a three-phase intelligent transformer calibrator, a programmable circuit and a data processing and analysis unit to achieve balanced regulation of three-phase voltage and current, switching of three-phase voltage and current loads, measurement of three-phase voltage and current signals and data processing and analysis.

[0038] The three-phase high-voltage electric energy metering device metering performance evaluation test device provided in the embodiment of the present disclosure has fixed positions and wiring of each functional module inside the three-phase high-voltage electric energy metering device metering performance evaluation test device, and fixed interference between each other, which can reduce the relative distance between each module and the uncertainty caused by wiring, thereby improving the accuracy of the test; the calibration of the combination transformer, voltage transformer and single-phase current transformer can be achieved using simple test wiring and operation.

[0039] The following is a detailed description of the three-phase high-voltage electric energy metering device metering performance evaluation test device provided in the embodiment of the present application in conjunction with the accompanying drawings. Figure 1 , which is a schematic diagram of a three-phase high-voltage electric energy metering device metering performance evaluation test device provided in an embodiment of the present disclosure.

[0040] Taking the three-phase high-voltage electric energy metering device metering performance evaluation test device as shown in the figure as an example, the three-phase high-voltage electric energy metering device metering performance evaluation test device includes a three-phase high-voltage electric energy metering device metering performance evaluation test device and a test placement platform; wherein the test placement platform is fixedly arranged on one side of the three-phase high-voltage electric energy metering device metering performance evaluation test device; the test placement platform is provided with a high-voltage insulator and the four corners of the test placement platform are provided with an infrared radiation grid. When an object is identified to pass through the infrared radiation grid, the three-phase high-voltage electric energy metering device metering performance evaluation test device cuts off the three-phase voltage regulation control power supply and gives an alarm prompt. Here, the placement platform described in the embodiment of the present disclosure is set as a through-type bushing, the test is connected to the high-voltage insulator through the bottom of the platform through a high-voltage cable, and the secondary line is also connected to the device through the bottom of the platform. There is no obvious wiring on the placement platform, which is simple and clear, and improves safety and reliability.

[0041] The following is a detailed description of the three-phase high-voltage electric energy metering device metering performance evaluation test device, which includes a three-phase integrated self-voltage and self-current standard device, a three-phase voltage regulation control power supply and a control unit.

[0042] It can be understood that the three-phase voltage-regulating control power supply includes three phases A, B, and C, and the three-phase integrated self-boosting and self-current-boosting standard device includes a boost circuit, a current boost circuit, a three-phase self-boosting standard voltage transformer and a three-phase self-boosting standard current transformer. The three-phase voltage-regulating control power supply is connected to the boost circuit, the three-phase self-boosting standard voltage transformer, the current boost circuit and the three-phase self-boosting standard current transformer in sequence, and the three-phase combination transformer to be tested is connected between the three-phase self-boosting standard voltage transformer and the three-phase self-boosting standard current transformer; the three-phase integrated self-boosting and self-current-boosting standard device provides a three-phase standard voltage signal, a three-phase standard current signal, a three-phase high-voltage power supply and a three-phase high-voltage current power supply for the calibration of the three-phase combination transformer to be tested.

[0043] Here, the boost circuit includes a first three-phase voltage regulator and a three-phase booster connected in sequence, and the three-phase booster is connected to a three-phase voltage regulation control power supply; see Figure 2 As shown, the three-phase voltage regulation control power supply A, B, C phases are respectively connected to the first interfaces of the A, B, C phases on the primary side of the three-phase booster, and the second interfaces of the A, B, C phases on the primary side of the three-phase booster are respectively grounded; the first interfaces of the A, B, C phases on the secondary side of the three-phase booster are respectively connected to the A, B, C phase interfaces of the first three-phase voltage regulator, and the second interfaces of the A, B, C phases on the secondary side of the three-phase booster are respectively grounded.

[0044] Specifically, the circuit connection mode of the current boosting circuit, the three-phase self-boosting standard voltage transformer and the three-phase self-boosting standard current transformer in the three-phase integrated self-boosting and self-current boosting standard device will change with the change of the connection mode of the three-phase combination transformer to be tested. The connection mode of the three-phase combination transformer to be tested can include V-type connection and Y-type connection.

[0045] Exemplarily, the current boosting circuit includes a second three-phase voltage regulator and a three-phase current booster connected in sequence. In the case where the three-phase combination transformer to be tested is a V-type three-phase combination transformer, see Figure 3 As shown, the three-phase current booster is connected to a three-phase voltage regulating control power supply; specifically, the three-phase voltage regulating control power supply phase A is connected to the first interface of the primary side phase A of the three-phase current booster, the three-phase voltage regulating control power supply phase C is connected to the first interface of the primary side phase C of the three-phase current booster, and the second interfaces of the primary side phases A and C of the three-phase current booster are respectively connected to the A and C phase output ends (i.e., AL1 and CL1) of the three-phase self-boosting standard current transformer; the first interfaces of the A, B, and C phases on the secondary side of the three-phase current booster are respectively connected to the A, B, and C phase interfaces of the second three-phase voltage regulator, and the second interfaces of the A, B, and C phases on the secondary side of the three-phase current booster are respectively grounded.

[0046] Phase A of the three-phase voltage regulating control power supply is connected to phase A of the primary winding of the three-phase self-boosting standard voltage transformer (represented as a three-phase standard voltage transformer in the figure), and phase C of the three-phase voltage regulating control power supply is connected to phase C of the primary winding of the three-phase self-boosting standard voltage transformer; phase B of the three-phase voltage regulating control power supply is connected to the x0 interface of the primary winding of the three-phase self-boosting standard voltage transformer; the secondary winding interface of the three-phase self-boosting standard voltage transformer is connected to the voltage calibrator, wherein the a0 interface of the secondary winding is respectively connected to the a0 interface and Ka interface of the voltage calibrator; the xa interface of the secondary winding is respectively connected to the xa interface of the voltage calibrator, the xc interface of the secondary winding and the ground wire; the c0 interface of the secondary winding is respectively connected to the c0 interface and Kc of the voltage calibrator.

[0047] The three-phase voltage regulating control power supply A, B, and C phases are respectively connected to the A, B, and C phases of the primary winding of the voltage end of the three-phase combination transformer to be tested; the secondary winding interface of the three-phase combination transformer to be tested is connected to the voltage tester; wherein the secondary winding interface a of the three-phase combination transformer to be tested is connected to the voltage tester Da; the secondary winding interface c of the three-phase combination transformer to be tested is connected to the voltage tester Dc; the secondary winding interface b of the three-phase combination transformer to be tested is grounded; the three-phase voltage regulating control power supply A phase is connected to the three-phase self-boosting standard current transformer (Figure The A phase of the primary winding of the three-phase high-voltage standard current transformer is connected, and the C phase of the three-phase voltage regulation control power supply is connected to the C phase of the primary winding of the three-phase self-boosting standard current transformer; the secondary winding interface of the three-phase self-boosting standard current transformer is connected to the current calibrator, wherein the ak2 interface of the secondary winding is connected to the T0a interface of the current calibrator; the ak1 interface of the secondary winding is connected to the Ka interface of the current calibrator; the ck2 interface of the secondary winding is connected to the T0c interface of the current calibrator; and the ck1 interface of the secondary winding is connected to the Kc interface of the current calibrator.

[0048] It can be understood that, when the three-phase combination transformer to be tested is a V-type three-phase combination transformer, when the three-phase combination transformer to be tested is connected to a voltage tester and a current tester, the following (1) to (2) may be included:

[0049] (1) The three-phase voltage regulating control power supply A, B, and C phases are respectively connected to the A, B, and C phases of the primary winding of the voltage end of the three-phase combination transformer to be tested; the secondary winding interface of the three-phase combination transformer to be tested is connected to the voltage calibrator; wherein the secondary winding interface a of the three-phase combination transformer to be tested is connected to the voltage calibrator Da; the secondary winding interface c of the three-phase combination transformer to be tested is connected to the voltage calibrator Dc; the secondary winding interface b of the three-phase combination transformer to be tested is grounded;

[0050] (2) Phase A of the three-phase voltage regulating control power supply is connected to phase A of the primary winding at the current end of the three-phase combination transformer to be tested, and phase C of the three-phase voltage regulating control power supply is connected to phase B of the primary winding at the current end of the three-phase combination transformer to be tested; the interface of the secondary winding at the current end of the three-phase combination transformer to be tested is connected to the three-phase self-boosting standard current transformer and the current calibrator; wherein the secondary winding as1 interface of the three-phase combination transformer to be tested is respectively connected to the ak1 interface of the three-phase self-boosting standard current transformer and the Ka interface of the current calibrator; the secondary winding as2 interface of the three-phase combination transformer to be tested is connected to the resistor Za and then to the ground; the secondary winding cs1 interface of the three-phase combination transformer to be tested is respectively connected to the ck1 interface of the three-phase self-boosting standard current transformer and the Kc interface of the current calibrator; the secondary winding cs2 interface of the three-phase combination transformer to be tested is connected to the resistor Zc and then to the ground.

[0051] Combine the following Figure 4 , the case where the three-phase combination transformer to be tested is a Y-type connected three-phase combination transformer is described in detail.

[0052] Specifically, when the three-phase combination transformer to be tested is a Y-type connected three-phase combination transformer, the connection method of the current boosting circuit is that the three-phase voltage regulating control power supply A, B, and C phases are respectively connected to the first interfaces of the primary side A, B, and C phases of the three-phase current booster; the second interfaces of the primary side A, B, and C phases of the three-phase current booster are respectively connected to the output ends of the A, B, and C phases of the three-phase self-boosting standard current transformer; the first interfaces of the A, B, and C phases on the secondary side of the three-phase current booster are respectively connected to the A, B, and C phase interfaces of the second three-phase voltage regulator, and the second interfaces of the A, B, and C phases on the secondary side of the three-phase current booster are respectively grounded.

[0053] The three-phase voltage regulating control power supply A, B, and C phases are respectively connected to the A, B, and C phases of the primary winding of the three-phase self-boosting standard voltage transformer (i.e., the three-phase standard voltage transformer); the x0 interface of the primary winding of the three-phase self-boosting standard voltage transformer is grounded; the secondary winding interface of the three-phase self-boosting standard voltage transformer is connected to the voltage calibrator, wherein the a0 interface of the secondary winding is connected to the a0 interface and Ka interface of the voltage calibrator; the xa interface of the secondary winding is respectively connected to the xb interface, xc interface and ground wire of the secondary winding; the b0 interface of the secondary winding is respectively connected to the b0 interface and Kb interface of the voltage calibrator; the c0 interface of the secondary winding is respectively connected to the c0 interface and Kc interface of the voltage calibrator; the xc interface of the secondary winding is respectively connected to the xa interface, xc interface and ground wire of the voltage calibrator.

[0054] The three-phase voltage regulating control power supply A, B, and C phases are respectively connected to the A, B, and C phases of the primary winding of the three-phase self-boosting standard current transformer; the interface of the secondary winding of the three-phase self-boosting standard current transformer (i.e., the three-phase high-voltage standard current transformer) is connected to the current calibrator, wherein the ak2 interface of the secondary winding is connected to the T0a interface of the current calibrator; the ak1 interface of the secondary winding is connected to the Ka interface of the current calibrator; the bk2 interface of the secondary winding is connected to the T0b interface of the current calibrator; the bk1 interface of the secondary winding is connected to the Kb interface of the current calibrator; the ck2 interface of the secondary winding is connected to the T0c interface of the current calibrator; and the ck1 interface of the secondary winding is connected to the Kc interface of the current calibrator.

[0055] It can be understood that, when the three-phase combination transformer to be tested is a Y-type three-phase combination transformer, when the three-phase combination transformer to be tested is connected to the voltage tester and the current tester, the following (a) to (b) may be included:

[0056] (a) The three-phase voltage regulating control power supply A, B, and C phases are respectively connected to the A, B, and C interfaces of the primary winding of the voltage end of the three-phase combination transformer to be tested; the secondary winding interface of the three-phase combination transformer to be tested is connected to the voltage calibrator; wherein the secondary winding interface a of the three-phase combination transformer to be tested is connected to the voltage calibrator Da; the secondary winding interface b of the three-phase combination transformer to be tested is connected to the voltage calibrator Db; the secondary winding interface c of the three-phase combination transformer to be tested is connected to the voltage calibrator Dc;

[0057] (b) The three-phase voltage regulating control power supply A, B, C phases are respectively connected to the A, B, C phases of the primary winding of the current end of the three-phase combination transformer to be tested; the secondary winding interface of the current end of the three-phase combination transformer to be tested is respectively connected to the three-phase self-boosting standard current transformer and the current calibrator; wherein the secondary winding as1 interface of the three-phase combination transformer to be tested is respectively connected to the ak1 interface of the three-phase self-boosting standard current transformer and the Ka interface of the current calibrator; the secondary winding as2 interface of the three-phase combination transformer to be tested is connected to the resistor Za is then connected to the ground wire; the secondary winding bs1 interface of the three-phase combination transformer to be tested is respectively connected to the bk1 interface of the three-phase self-boosting standard current transformer and the Kb interface of the current calibrator; the secondary winding bs2 interface of the three-phase combination transformer to be tested is connected to the ground wire after connecting the resistor Zb; the secondary winding cs1 interface of the three-phase combination transformer to be tested is respectively connected to the ck1 interface of the three-phase self-boosting standard current transformer and the Kc interface of the current calibrator; the secondary winding cs2 interface of the three-phase combination transformer to be tested is connected to the resistor Zc and then grounded.

[0058] Exemplarily, in a three-phase high-voltage electric energy metering device metering performance evaluation test device, the control unit is composed of a three-phase balanced voltage regulating source, a three-phase balanced current regulating source, a three-phase voltage load, a three-phase current load, a three-phase intelligent transformer calibrator, a programmable circuit and a data processing and analysis unit to achieve balanced regulation of three-phase voltage and current, switching of three-phase voltage and current loads, measurement of three-phase voltage and current signals, and data processing and analysis.

[0059] Here, the three-phase balanced voltage regulating source is connected to three standard voltage sources; the three-phase balanced current regulating source is connected to three standard current sources; and the three-phase intelligent transformer tester is connected to the three-phase combined transformer to be tested.

[0060] Specifically, the three-phase voltage load is used to simulate the three-phase voltage load; the three-phase current load is used to simulate the three-phase current load; the programmable circuit is a circuit that can be adjusted and controlled by a program or a control signal, and is used to control the operation of the first three-phase voltage regulator, the second three-phase voltage regulator, the three-phase booster, the three-phase current booster, the three-phase self-boosting standard voltage transformer and the three-phase self-boosting standard current transformer; the data processing and analysis unit receives data of the first three-phase voltage regulator, the second three-phase voltage regulator, the three-phase booster, the three-phase current booster, the three-phase self-boosting standard voltage transformer and the three-phase self-boosting standard current transformer, and performs data processing and analysis, and the data processing and analysis may include data cleaning, conversion, statistical analysis, and machine learning techniques to obtain required data information.

[0061] The three-phase high-voltage electric energy metering device metering performance evaluation test device provided in the embodiment of the present disclosure adopts a three-phase voltage regulator, a three-phase booster, a three-phase current booster, a three-phase self-boosting standard voltage transformer, and a three-phase self-boosting standard current transformer, which are integrated in an inflatable shell according to the above-mentioned connection method to form a three-phase integrated boost and current standard device, and provide a three-phase standard voltage signal, a three-phase standard current signal, a three-phase high-voltage power supply, and a three-phase high-voltage current power supply for the calibration of the three-phase combination transformer. Since the positions and wiring of each functional module inside the three-phase high-voltage electric energy metering device metering performance evaluation test device are fixed, and the interference between them is fixed, the relative distance between each module and the uncertainty caused by the wiring can be reduced, and the accuracy of the test can be improved; the calibration of the combination transformer, voltage transformer and single-phase current transformer can be realized by using simple test wiring and operation.

[0062] Those skilled in the art can clearly understand that, for the convenience and simplicity of description, the specific working process of the system and device described above can refer to the corresponding process in the aforementioned method embodiment, and will not be repeated here. In the several embodiments provided in the present disclosure, it should be understood that the disclosed system and method can be implemented in other ways. The device embodiments described above are merely schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some communication interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0063] 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 distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0064] Finally, it should be noted that the above-described embodiments are only specific implementation methods of the present disclosure, which are used to illustrate the technical solutions of the present disclosure, rather than to limit them. The protection scope of the present disclosure is not limited thereto. Although the present disclosure is described in detail with reference to the above-described embodiments, ordinary technicians in the field should understand that any technician familiar with the technical field can still modify the technical solutions recorded in the above-described embodiments within the technical scope disclosed in the present disclosure, or can easily think of changes, or make equivalent replacements for some of the technical features therein; and these modifications, changes or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present disclosure, and should be included in the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure should be based on the protection scope of the claims.

Claims

1. A three-phase high-voltage electric energy metering device metering performance evaluation test device, characterized in that: The device comprises a three-phase integrated self-voltage and self-current standard device, a three-phase voltage regulation control power supply and a control unit; The three-phase integrated self-boosting and self-current boosting standard device comprises a boosting circuit, a current boosting circuit, a three-phase self-boosting standard voltage transformer and a three-phase self-boosting standard current transformer. The three-phase voltage regulation control power supply is sequentially connected to the boosting circuit, the three-phase self-boosting standard voltage transformer, the current boosting circuit and the three-phase self-boosting standard current transformer. The boosting circuit comprises a first three-phase voltage regulator and a three-phase booster connected in sequence, and the three-phase booster is connected to the three-phase voltage regulation control power supply; the current boosting circuit comprises a second three-phase voltage regulator and a three-phase current booster connected in sequence, and the three-phase current booster is connected to the three-phase voltage regulation control power supply; the three-phase combination transformer to be tested is connected between the three-phase self-boosting standard voltage transformer and the three-phase self-boosting standard current transformer; the three-phase integrated self-boosting and self-current boosting standard device provides a three-phase standard voltage signal, a three-phase standard current signal, a three-phase high-voltage power supply and a three-phase high-voltage current power supply for the calibration of the three-phase combination transformer to be tested; The control unit is composed of a three-phase balanced voltage regulating source, a three-phase balanced current regulating source, a three-phase voltage load, a three-phase current load, a three-phase intelligent transformer tester, a programmable circuit and a data processing and analysis unit to achieve balanced regulation of three-phase voltage and current, switching of three-phase voltage and current loads, measurement of three-phase voltage and current signals, and data processing and analysis.

2. The three-phase high-voltage electric energy metering device metering performance evaluation test device according to claim 1 is characterized in that: The three-phase voltage regulation control power supply includes three phases A, B and C. The three-phase voltage regulating control power supply A, B, C phases are respectively connected to the first interfaces of the A, B, C phases on the primary side of the three-phase booster, and the second interfaces of the A, B, C phases on the primary side of the three-phase booster are respectively grounded; The first interfaces of the A, B, and C phases on the secondary side of the three-phase booster are respectively connected to the A, B, and C phase interfaces of the first three-phase voltage regulator, and the second interfaces of the A, B, and C phases on the secondary side of the three-phase booster are respectively grounded.

3. The three-phase high-voltage electric energy metering device metering performance evaluation test device according to claim 1 is characterized in that: In the case where the three-phase combination transformer to be tested is a V-type connected three-phase combination transformer, the three-phase voltage regulating control power supply phase A is connected to the first interface of the primary side phase A of the three-phase current booster, the three-phase voltage regulating control power supply phase C is connected to the first interface of the primary side phase C of the three-phase current booster, and the second interfaces of the primary side phases A and C of the three-phase current booster are respectively connected to the output ends of the phases A and C of the three-phase self-boosting standard current transformer; the first interfaces of the phases A, B, and C of the secondary side of the three-phase current booster are respectively connected to the interfaces of the phases A, B, and C of the second three-phase voltage regulator, and the second interfaces of the phases A, B, and C of the secondary side of the three-phase current booster are respectively grounded; When the three-phase combination transformer to be tested is a Y-type connected three-phase combination transformer, the three-phase voltage regulating control power supply A, B, and C phases are respectively connected to the first interfaces of the primary side A, B, and C phases of the three-phase current booster; the second interfaces of the primary side A, B, and C phases of the three-phase current booster are respectively connected to the output ends of the A, B, and C phases of the three-phase self-boosting standard current transformer; the first interfaces of the A, B, and C phases on the secondary side of the three-phase current booster are respectively connected to the A, B, and C phase interfaces of the second three-phase voltage regulator, and the second interfaces of the A, B, and C phases on the secondary side of the three-phase current booster are respectively grounded.

4. The three-phase high-voltage electric energy metering device metering performance evaluation and testing device according to claim 1 is characterized in that: In the case where the three-phase combination transformer to be tested is a V-type connected three-phase combination transformer, the three-phase voltage regulating control power supply phase A is connected to the phase A of the primary winding of the three-phase self-boosting standard voltage transformer, and the three-phase voltage regulating control power supply phase C is connected to the phase C of the primary winding of the three-phase self-boosting standard voltage transformer; the three-phase voltage regulating control power supply phase B is connected to the x0 interface of the primary winding of the three-phase self-boosting standard voltage transformer; the secondary winding interface of the three-phase self-boosting standard voltage transformer is connected to the voltage calibrator, wherein the a0 interface of the secondary winding is respectively connected to the a0 interface and the Ka interface of the voltage calibrator; the xa interface of the secondary winding is respectively connected to the xa interface of the voltage calibrator, the xc interface of the secondary winding and the ground wire; the c0 interface of the secondary winding is respectively connected to the c0 interface and Kc of the voltage calibrator; When the three-phase combination transformer to be tested is a Y-type connected three-phase combination transformer, the three-phase voltage regulating control power supply A, B, and C phases are respectively connected to the A, B, and C phases of the primary winding of the three-phase self-boosting standard voltage transformer; the x0 interface of the primary winding of the three-phase self-boosting standard voltage transformer is grounded; the secondary winding interface of the three-phase self-boosting standard voltage transformer is connected to the voltage calibrator, wherein the a0 interface of the secondary winding is connected to the a0 interface and the Ka interface of the voltage calibrator; the xa interface of the secondary winding is respectively connected to the xb interface, the xc interface and the ground wire of the secondary winding; the b0 interface of the secondary winding is respectively connected to the b0 interface and the Kb interface of the voltage calibrator; the c0 interface of the secondary winding is respectively connected to the c0 interface and the Kc interface of the voltage calibrator; the xc interface of the secondary winding is respectively connected to the xa interface, the xc interface and the ground wire of the voltage calibrator.

5. The three-phase high-voltage electric energy metering device metering performance evaluation and testing device according to claim 1 is characterized in that: In the case where the three-phase combination transformer to be tested is a V-type connected three-phase combination transformer, the three-phase voltage regulating control power supply phase A is connected to the phase A of the primary winding of the three-phase self-boosting standard current transformer, and the three-phase voltage regulating control power supply phase C is connected to the phase C of the primary winding of the three-phase self-boosting standard current transformer; the secondary winding interface of the three-phase self-boosting standard current transformer is connected to the current calibrator, wherein the ak2 interface of the secondary winding is connected to the T0a interface of the current calibrator; the ak1 interface of the secondary winding is connected to the Ka interface of the current calibrator; the ck2 interface of the secondary winding is connected to the T0c interface of the current calibrator; the ck1 interface of the secondary winding is connected to the Kc interface of the current calibrator; When the three-phase combination transformer to be tested is a Y-type connected three-phase combination transformer, the three-phase voltage regulating control power supply A, B, and C phases are respectively connected to the A, B, and C phases of the primary winding of the three-phase self-boosting standard current transformer; the interface of the secondary winding of the three-phase self-boosting standard current transformer is connected to the current calibrator, wherein the ak2 interface of the secondary winding is connected to the T0a interface of the current calibrator; the ak1 interface of the secondary winding is connected to the Ka interface of the current calibrator; the bk2 interface of the secondary winding is connected to the T0b interface of the current calibrator; the bk1 interface of the secondary winding is connected to the Kb interface of the current calibrator; the ck2 interface of the secondary winding is connected to the T0c interface of the current calibrator; and the ck1 interface of the secondary winding is connected to the Kc interface of the current calibrator.

6. The three-phase high-voltage electric energy metering device metering performance evaluation and testing device according to claim 1 is characterized in that: In the case where the three-phase combination transformer to be tested is a V-type connected three-phase combination transformer, the three-phase voltage regulating control power supply A, B, C phases are respectively connected to the A, B, C phases of the primary winding at the voltage end of the three-phase combination transformer to be tested; the secondary winding interface of the three-phase combination transformer to be tested is connected to the voltage calibrator; wherein the secondary winding interface a of the three-phase combination transformer to be tested is connected to the voltage calibrator Da; the secondary winding interface c of the three-phase combination transformer to be tested is connected to the voltage calibrator Dc; the secondary winding interface b of the three-phase combination transformer to be tested is grounded; Phase A of the three-phase voltage regulating control power supply is connected to phase A of the primary winding at the current end of the three-phase combination transformer to be tested, and phase C of the three-phase voltage regulating control power supply is connected to phase B of the primary winding at the current end of the three-phase combination transformer to be tested; the interface of the secondary winding at the current end of the three-phase combination transformer to be tested is connected to the three-phase self-boosting standard current transformer and the current calibrator; wherein, the secondary winding as1 interface of the three-phase combination transformer to be tested is respectively connected to the ak1 interface of the three-phase self-boosting standard current transformer and the Ka interface of the current calibrator; the secondary winding as2 interface of the three-phase combination transformer to be tested is connected to resistor Za and then grounded; the secondary winding cs1 interface of the three-phase combination transformer to be tested is respectively connected to the ck1 interface of the three-phase self-boosting standard current transformer and the Kc interface of the current calibrator; the secondary winding cs2 interface of the three-phase combination transformer to be tested is connected to resistor Zc and then grounded.

7. The three-phase high-voltage electric energy metering device metering performance evaluation and testing device according to claim 1 is characterized in that: In the case where the three-phase combination transformer to be tested is a Y-type connected three-phase combination transformer, the three-phase voltage regulating control power supply A, B, C phases are respectively connected to the A, B, C interfaces of the primary winding of the voltage end of the three-phase combination transformer to be tested; the secondary winding interface of the three-phase combination transformer to be tested is connected to the voltage calibrator; wherein the secondary winding interface a of the three-phase combination transformer to be tested is connected to the voltage calibrator Da; the secondary winding interface b of the three-phase combination transformer to be tested is connected to the voltage calibrator Db; the secondary winding interface c of the three-phase combination transformer to be tested is connected to the voltage calibrator Dc; The three-phase voltage regulating control power supply A, B, C phases are respectively connected to the A, B, C phases of the primary winding of the current end of the three-phase combination transformer to be tested; the secondary winding interface of the current end of the three-phase combination transformer to be tested is respectively connected to the three-phase self-boosting standard current transformer and the current calibrator; wherein, the secondary winding as1 interface of the three-phase combination transformer to be tested is respectively connected to the ak1 interface of the three-phase self-boosting standard current transformer and the Ka interface of the current calibrator; the secondary winding as2 interface of the three-phase combination transformer to be tested is connected to the resistor Z a and then connected to the ground wire; the secondary winding bs1 interface of the three-phase combination transformer to be tested is respectively connected to the bk1 interface of the three-phase self-boosting standard current transformer and the Kb interface of the current calibrator; the secondary winding bs2 interface of the three-phase combination transformer to be tested is connected to the ground wire after connecting the resistor Zb; the secondary winding cs1 interface of the three-phase combination transformer to be tested is respectively connected to the ck1 interface of the three-phase self-boosting standard current transformer and the Kc interface of the current calibrator; the secondary winding cs2 interface of the three-phase combination transformer to be tested is connected to the resistor Zc and then grounded.

8. The three-phase high-voltage electric energy metering device metering performance evaluation and testing device according to claim 1 is characterized in that: The three-phase balanced voltage regulating source is connected to three standard voltage sources; the three-phase balanced current regulating source is connected to three standard current sources; and the three-phase intelligent transformer tester is connected to the three-phase combined transformer to be tested.

9. The three-phase high-voltage electric energy metering device metering performance evaluation and testing device according to claim 1 is characterized in that: The three-phase voltage load is used to simulate the three-phase voltage load; the three-phase current load is used to simulate the three-phase current load; the programmable circuit is used to control the operation of the first three-phase voltage regulator, the second three-phase voltage regulator, the three-phase booster, the three-phase current booster, the three-phase self-boosting standard voltage transformer and the three-phase self-boosting standard current transformer; the data processing and analysis unit receives data from the first three-phase voltage regulator, the second three-phase voltage regulator, the three-phase booster, the three-phase current booster, the three-phase self-boosting standard voltage transformer and the three-phase self-boosting standard current transformer, and performs data processing and analysis.

10. The three-phase high-voltage electric energy metering device metering performance evaluation and testing device according to claim 1, characterized in that: The device also includes a test platform, which is fixedly arranged on one side of the three-phase high-voltage electric energy metering device metering performance evaluation test device; high-voltage insulators are arranged on the test platform and infrared counter-radiation grids are arranged at the four corners of the test platform. When an object is identified to pass through the infrared counter-radiation grid, the three-phase high-voltage electric energy metering device metering performance evaluation test device cuts off the three-phase voltage regulation control power supply and gives an alarm prompt.

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