Error detection test system and circuit of three-phase three-element combined mutual inductor

Abstract

The embodiment of the present invention relates to an error detection test system for a three-phase three-element combination transformer. When different voltages are applied to the three-phase combination transformer at the same time, three groups of current boosters apply line current to three groups of high-voltage standard current transformers according to a first three-phase booster, and a current load box is connected to the output winding of each phase current transformer. Three groups of boosters apply line voltage to three groups of standard voltage transformers according to a second three-phase booster, and a voltage load box is connected to the output winding of each phase voltage transformer, thereby simulating the operating conditions of a three-phase mutual inductance test product under different voltage loads, and carrying out high-voltage performance detection of the three-phase three-element combination transformer, and obtaining the error characteristics of the three-phase three-element combination transformer, thereby improving the metering accuracy of an electric energy metering device of a distribution network system.

Description

Technical Field

[0001] The invention belongs to the technical field of error detection of a three-phase three-element combination transformer, and in particular relates to a current error measurement circuit and a voltage error measurement circuit in a three-phase combination transformer for measurement. Background Art

[0002] As an important part of the power system, the distribution network system has a wide coverage and a large amount of electricity sold. Accurately detecting and reducing the mutual inductor error in the distribution network system is one of the key technologies in the field of electric energy metering. Three-phase three-element combination mutual inductors are widely used in distribution networks, and the traditional detection circuits for their error characteristics include single-phase method and indirect method. The single-phase method detection does not consider the influence of electromagnetic field on the error, resulting in the detection results not accurately reflecting its true error characteristics; the indirect method detection obtains the maximum range of the mutual inductor error, which is still not the true error, and has the disadvantages of greater testing difficulty and poor data reliability. The existing circuit cannot accurately detect the true error characteristics of the three-phase three-element combination mutual inductor, resulting in the error performance of the three-phase three-element combination mutual inductor under actual conditions is still unclear. Therefore, it is of great academic significance and engineering value to study the error detection circuit and performance improvement of the three-phase three-element combination mutual inductor to ensure its good metering performance and fairness in electric energy trade under operating conditions.

[0003] As the front-end equipment of high-voltage electric energy metering, high-voltage combination transformers are widely used. In order to ensure the fairness of trade settlement, it is urgent to develop a set of high-voltage three-phase three-element combination transformer calibration equipment, which can accurately detect the errors of three-phase combination transformers in actual operation. However, the traceability problem of high-voltage combination calibration equipment has not been solved yet, and there is a lack of corresponding specifications and equipment. Therefore, this project mainly solves the actual operation errors of three-phase combination transformers to be effectively calibrated, as well as the traceability problem of high-voltage combination transformer calibration equipment.

[0004] To detect the error characteristics of a three-phase three-element combination transformer using the three-phase method, an error detection platform for detecting the three-phase three-element combination transformer is required. The current high-voltage standard current transformer can only detect the error of the current transformer without pressure, but not under high voltage. One of the main reasons is the lack of high-voltage standard current transformers that can be used under rated high voltage. Therefore, the development of high-voltage standard current transformers is based on the key and difficulty of detecting the error of a three-phase three-element combination transformer using the three-phase method. Summary of the invention

[0005] Based on the above situation, the main purpose of this application is to provide a three-phase three-element combination transformer error detection test system, carry out error detection on the three-phase three-element combination transformer, and design a test system and circuit for a self-boosting high-voltage standard current transformer that can prevent the influence of leakage current.

[0006] In order to achieve the above purpose, the technical solution adopted in this application is as follows: An error detection test system for a three-phase three-element combination transformer, comprising a first three-phase voltage regulator, a second three-phase voltage regulator, a first current booster, a second current booster, a third current booster, a first voltage booster, a second voltage booster, a third voltage booster, a first high-voltage standard current transformer, a second high-voltage standard current transformer, a third high-voltage standard current transformer, a first standard voltage transformer, a second standard voltage transformer, a third standard voltage transformer, a current and voltage load box, a tested three-phase three-element combination transformer, and a three-phase mutual inductance tester; The three-phase three-element combination transformer under test includes a first voltage transformer under test, a second voltage transformer under test, a third voltage transformer under test, a first current transformer under test, a second current transformer under test, and a third current transformer under test; The three-phase induction tester includes a first three-phase induction tester and a second three-phase induction tester; The first three-phase mutual inductance tester includes a first terminal, a second terminal, a third terminal, a fourth terminal, a fifth terminal, a sixth terminal and a seventh terminal; The second three-phase mutual inductance tester includes a first terminal, a second terminal, a third terminal, a fourth terminal, a fifth terminal, a sixth terminal, a seventh terminal, an eighth terminal, a ninth terminal, and a tenth terminal.

[0007] Wherein, the input end of the first three-phase voltage regulator is connected to the input end of the second three-phase voltage regulator and is connected to a test signal; The output end of the first three-phase voltage regulator is connected to the input end of the first current booster, the input end of the second current booster and the input end of the third current booster; The output end of the first high-voltage standard current transformer is connected to the first input end of the tested three-phase three-element combination transformer; The output end of the second high-voltage standard current transformer is connected to the second input end of the tested three-phase three-element combination transformer; The output terminal of the third high-voltage standard current transformer is connected to the third input terminal of the tested three-phase three-element combination transformer; The output end of the second three-phase voltage regulator is connected to the input end of the first booster, the input end of the second booster and the input end of the third booster; The output end of the first booster is connected to the input end of the first standard voltage transformer and the fourth input end of the tested three-phase three-element combination transformer; The output end of the second booster is connected to the input end of the second standard voltage transformer and the fifth input end of the tested three-phase three-element combination transformer; The output end of the third booster is connected to the input end of the third standard voltage transformer and the sixth input end of the tested three-phase three-element combination transformer; It also includes that the output end of the current and voltage load box is connected to the seventh input end of the tested three-phase three-element combination transformer; Furthermore, the output end of the tested three-phase three-element combination transformer is connected to the input end of the three-phase mutual inductance tester.

[0008] The embodiment of the present application also provides a current error detection circuit of a three-phase two-element combination transformer, which is applied to the three-phase three-element combination transformer error detection test system, wherein the three-phase two-element combination transformer current error detection circuit includes a first resistor and a second resistor; The first three-phase voltage regulator includes a first voltage regulator and a second voltage regulator; The input end of the first voltage regulator is connected to the input end of the second voltage regulator and is connected to the test signal; The output end of the first voltage regulator, the output end of the second voltage regulator, the second end of the input winding of the first current booster and the second end of the input winding of the third current booster are connected and connected to a common end; The adjustable end of the first voltage regulator is connected to the first end of the input winding of the first current booster; The adjustable end of the second voltage regulator is connected to the first end of the input winding of the third current booster; A first end of the output winding of the first current booster is connected to one end of the first phase live wire, and a second end of the output winding of the first current booster is connected to the other end of the first phase live wire; A first end of the output winding of the third current booster is connected to one end of the third phase live wire, and a second end of the output winding of the third current booster is connected to the other end of the third phase live wire; The same-name end of the first high-voltage standard current transformer is connected to the same-name end of the first current transformer under test and the fifth terminal of the first three-phase inductance tester, and the opposite-name end of the first high-voltage standard current transformer is connected to the third terminal of the first three-phase inductance tester; The same-name end of the second high-voltage standard current transformer is connected to the same-name end of the second current transformer under test and the sixth terminal of the first three-phase inductance tester, and the opposite-name end of the second high-voltage standard current transformer is connected to the fourth terminal of the first three-phase inductance tester; The opposite-name end of the first current transformer under test is connected to the opposite-name end of the second current transformer under test, the second end of the first resistor, the second end of the second resistor and the ground terminal; The first end of the first resistor is connected to the first terminal of the first three-phase mutual inductance tester; The first end of the second resistor is connected to the second terminal of the first three-phase mutual inductance tester; The seventh terminal of the first three-phase mutual inductance tester is connected to the ground terminal; The first-phase live wire runs through the first high-voltage standard current transformer and the first tested current transformer; The third-phase live wire runs through the second high-voltage standard current transformer and the second tested current transformer.

[0009] The embodiment of the present application also provides a three-phase three-element combination transformer voltage error detection circuit, and the three-phase three-element combination transformer error detection test system is applied, and the three-phase three-element combination transformer voltage error detection circuit also includes a third resistor, a fourth resistor and a fifth resistor; The second three-phase voltage regulator includes a third voltage regulator, a fourth voltage regulator and a fifth voltage regulator; The input end of the third voltage regulator, the input end of the fourth voltage regulator and the input end of the fifth voltage regulator are connected to each other and connected to the test signal; The output end of the third voltage regulator, the output end of the fourth voltage regulator and the output end of the fifth voltage regulator are connected to a common end; The adjustable end of the third voltage regulator is connected to the first end of the input winding of the first booster; The adjustable end of the fourth voltage regulator is connected to the first end of the input winding of the second booster; The adjustable end of the fifth voltage regulator is connected to the first end of the input winding of the third booster; The second end of the input winding of the first booster is connected to the second end of the input winding of the second booster and the second end of the input winding of the second booster, and is connected to a common end; The first end of the output winding of the first booster is connected to the first end of the input winding of the first tested voltage transformer and the first end of the input winding of the first standard voltage transformer; The first end of the output winding of the second booster is connected to the first end of the input winding of the second tested voltage transformer and the first end of the input winding of the second standard voltage transformer; The first end of the output winding of the third booster is connected to the first end of the input winding of the third tested voltage transformer and the first end of the input winding of the third standard voltage transformer; The second end of the output winding of the first booster is connected to the second end of the output winding of the second booster, the second end of the output winding of the third booster and the ground; The second end of the input winding of the first tested voltage transformer is connected to the second end of the input winding of the second tested voltage transformer and the second end of the input winding of the third tested voltage transformer; The first end of the output winding of the first tested voltage transformer is connected to the first end of the output winding of the second tested voltage transformer, the first end of the output winding of the third tested voltage transformer, the first end of the third resistor, the first end of the fourth resistor, and the first end of the fifth resistor; The second end of the output winding of the first tested voltage transformer is connected to the second end of the third resistor, the first end of the output winding of the first standard voltage transformer, and the first terminal of the second three-phase mutual inductance tester; The second end of the output winding of the second tested voltage transformer is connected to the second end of the fourth resistor, the first end of the output winding of the second standard voltage transformer, and the third terminal of the second three-phase mutual inductance tester; The second end of the output winding of the third tested voltage transformer is connected to the second end of the fifth resistor, the first end of the output winding of the third standard voltage transformer, and the fifth terminal of the second three-phase mutual inductance tester; The second end of the input winding of the first standard voltage transformer is connected to the second end of the input winding of the second standard voltage transformer and the second end of the input winding of the third standard voltage transformer; The second end of the output winding of the first standard voltage transformer is connected to the second wiring terminal and the seventh wiring terminal of the second three-phase mutual inductance tester; The second end of the output winding of the second standard voltage transformer is connected to the fourth terminal and the eighth terminal of the second three-phase mutual inductance tester; The second end of the output winding of the third standard voltage transformer is connected to the sixth terminal and the ninth terminal of the second three-phase mutual inductance tester; The tenth terminal of the second and third mutual inductance tester is connected to the ground terminal.

[0010] In summary, through the three-phase three-element combination transformer voltage test system, the influence of leakage current generated by high voltage on current transformer error is analyzed in two forms, namely, a three-phase combination transformer and a combination of multiple voltage transformers and multiple current transformers, a high-voltage standard current transformer for three-phase detection is developed, and a three-phase three-element combination transformer error detection test platform is built to realize the three-phase detection of three-phase three-element combination transformer error. Therefore, compared with the three-phase detection circuit used in the prior art, the embodiment of the present application uses a three-phase three-element combination transformer error detection platform to simulate operating conditions under different loads, and carries out metrological performance detection of the three-phase three-element combination transformer, analyzes the error characteristics of the three-phase three-element combination transformer, and can ensure that it has good metrological performance under operating conditions.

[0011] Other beneficial effects of the present application will be explained in the specific implementation manner through the introduction of specific technical features and technical solutions. Through the introduction of these technical features and technical solutions, those skilled in the art should be able to understand the beneficial technical effects brought about by the technical features and technical solutions. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

[0013] Figure 1 This is a diagram of an error detection system of a three-phase three-element combination transformer disclosed in this embodiment; Figure 2 A current error detection circuit diagram of a three-phase two-element combination transformer disclosed in this embodiment; Figure 3 A voltage error detection circuit diagram of a three-phase three-element combination transformer disclosed in this embodiment; DETAILED DESCRIPTION

[0014] The present application is described below based on embodiments, but the present application is not limited to these embodiments. In the detailed description of the present application below, some specific details are described in detail. In order to avoid confusing the essence of the present application, well-known methods, processes, procedures, and components are not described in detail.

[0015] In addition, persons of ordinary skill in the art will appreciate that the drawings provided herein are for illustration purposes and are not necessarily drawn to scale.

[0016] Unless the context clearly requires otherwise, throughout the specification and claims, the words "include", "comprising" and similar words should be interpreted in an inclusive sense rather than an exclusive or exhaustive sense; that is, in the sense of "including but not limited to".

[0017] In the description of this application, it should be understood that the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. In addition, in the description of this application, unless otherwise specified, the meaning of "plurality" is two or more.

[0018] See also Figure 1 , Figure 1 A three-phase three-element combination transformer error detection system diagram provided in an embodiment of the present application. A three-phase three-element combination transformer error detection test system comprises a first three-phase voltage regulator (1011), a second three-phase voltage regulator (1012), a first current booster (1021), a second current booster (1022), a third current booster (1023), a first voltage booster (1031), a second voltage booster (1032), a third voltage booster (1033), a first high-voltage standard current transformer (1041), a second high-voltage standard current transformer (1042), a third high-voltage standard current transformer (1043), a first standard voltage transformer (1051), a second standard voltage transformer (1052), a third standard voltage transformer (1053), a current and voltage load box (106), a tested three-phase three-element combination transformer (107), and a three-phase mutual inductance tester (108); The tested three-phase three-element combined transformer (107) comprises a first tested voltage transformer (1071), a second tested voltage transformer (1072), a third tested voltage transformer (1073), a first tested current transformer (1074), a second tested current transformer (1075), and a third tested current transformer; Among them, high voltage standard Current transformer The basic structure of the transformer is relatively simple, mainly composed of primary winding, secondary winding, iron core, frame, housing and terminal blocks. In addition, the winding can be divided into the same-name end and the opposite-name end according to the polarity of the current input and output. The same-name end refers to the end with the same polarity on the primary and secondary sides, and the opposite-name end refers to the end with opposite polarity on the primary and secondary sides. The three-phase induction tester (108) comprises a first three-phase induction tester (1081) and a second three-phase induction tester (1082); The first three-phase mutual inductance tester (1081) comprises a first connection terminal (T X1 )、Second terminal(T X2 )、The third terminal (T 01 )、The fourth terminal(T 02 ), a fifth terminal (K1), a sixth terminal (K2) and a seventh terminal (D); The second three-phase mutual inductance tester (1082) comprises a first terminal (a1), a second terminal (x1), a third terminal (a2), a fourth terminal (x2), a fifth terminal (a3), a sixth terminal (x3), a seventh terminal (k1), an eighth terminal (k2), a ninth terminal (k3), and a tenth terminal (D).

[0019] The three-phase mutual inductance tester is a test equipment for power systems and other units engaged in mutual inductance verification. Users only need to use the mouse and keyboard to operate the virtual instrument interface on the computer screen, input the mutual inductance type, range, Accuracy, etc. class , capacity, power factor and other parameters can be used to complete the fully automatic test of current transformers and voltage transformers.

[0020] Wherein, the input end of the first three-phase voltage regulator (1011) is connected to the input end of the second three-phase voltage regulator (1012), and is connected to a test signal; The test signal is that when measuring voltage error or voltage harmonics, only the voltage signal needs to be input; when measuring current error or current harmonics, only the current signal needs to be input; The output end of the first three-phase voltage regulator (1011) is connected to the input end of the first current booster (1021), the input end of the second current booster (1022), and the input end of the third current booster (1023); The output end of the first high-voltage standard current transformer (1041) is connected to the first input end of the tested three-phase three-element combined current transformer (107); The output end of the second high-voltage standard current transformer (1042) is connected to the second input end of the tested three-phase three-element combined transformer (107); The output end of the third high-voltage standard current transformer (1043) is connected to the third input end of the tested three-phase three-element combined transformer (107); The output end of the second three-phase voltage regulator (1012) is connected to the input end of the first booster (1031), the input end of the second booster (1032) and the input end of the third booster (1033); The output end of the first booster (1031) is connected to the input end of the first standard voltage transformer (1051) and the fourth input end of the tested three-phase three-element combined transformer (107); The output end of the second booster (1032) is connected to the input end of the second standard voltage transformer (1052) and the fifth input end of the tested three-phase three-element combined transformer (107); The output end of the third booster (1033) is connected to the input end of the third standard voltage transformer (1053) and the sixth input end of the tested three-phase three-element combined transformer (107).

[0021] It also includes that the output end of the current and voltage load box (106) is connected to the seventh input end of the tested three-phase three-element combined mutual inductor (107).

[0022] The output end of the tested three-phase three-element combined mutual inductor (107) is connected to the input end of a three-phase mutual inductance tester (108).

[0023] In one embodiment, a three-phase three-element combination transformer error detection system is applied to a power distribution network system, including two forms: a three-phase combination transformer and a combination of multiple voltage transformers and multiple current transformers.

[0024] The input end of the first three-phase voltage regulator (1011) is connected to the input end of the second three-phase voltage regulator (1012), and is connected to a test signal; the output end of the first three-phase voltage regulator (1011) is connected to the input end of three groups of current boosters, and the output ends of the three groups of current boosters are connected to the input ends of three groups of high-voltage standard current transformers; the output end of the second three-phase voltage regulator (1012) is connected to the input end of three groups of boosters, and the output ends of the three groups of boosters are connected to the input ends of three groups of standard voltage transformers; the three groups of current boosters are respectively connected to the three-phase three-element combination current transformers (107) under test, and the three groups of boosters are respectively connected to the three-phase three-element combination voltage transformers (107) under test.

[0025] The three-phase mutual inductor tester (108) can use the ferromagnetic performance parameters and high-voltage leakage current of the combined mutual inductor to indirectly measure the combined mutual inductor error, and compare it with the traceable high-voltage three-phase combined mutual inductor standard, complying with the verification regulations and meeting the requirements for on-site portable verification and calibration.

[0026] Figure 2 The embodiment provided in the present solution is a current error detection circuit of a three-phase two-element combination transformer, which is applied to an error detection test system of the three-phase three-element combination transformer. The current error detection circuit of the three-phase two-element combination transformer includes a first resistor (Z1) and a second resistor (Z2); The first three-phase voltage regulator (1011) comprises a first voltage regulator (10111) and a second voltage regulator (10112); The input end of the first voltage regulator (10111) is connected to the input end of the second voltage regulator (10112), and is also connected to the test signal; The output end of the first voltage regulator (10111), the output end of the second voltage regulator (10112), the second end of the input winding of the first current booster (1021), and the second end of the input winding of the third current booster (1023) are connected and connected to a common end; The adjustable end of the first voltage regulator (10111) is connected to the first end of the input winding of the first current booster (1021); The adjustable end of the second voltage regulator (10112) is connected to the first end of the input winding of the third current booster (1023); A first end of the output winding of the first current booster (1021) is connected to one end of a first-phase live wire, and a second end of the output winding of the first current booster is connected to the other end of the first-phase live wire; The first end of the output winding of the third current booster (1023) is connected to one end of the third-phase live wire, and the second end of the output winding of the third current booster is connected to the other end of the third-phase live wire.

[0027] in, Figure 2 Line A, line B, and line C represent the first phase live wire, the second phase live wire, and the third phase live wire respectively, and point a, point b, and point c represent voltage phases that differ by 120 degrees respectively.

[0028] The same-name end of the first high-voltage standard current transformer (1041) is connected to the same-name end of the first current transformer under test (1074) and the fifth terminal (k1) of the first three-phase mutual inductance tester (1081), and the opposite-name end of the first high-voltage standard current transformer (1041) is connected to the third terminal (T 01 )connect; The same-name end of the second high-voltage standard current transformer (1042) is connected to the same-name end of the second current transformer under test (1075) and the sixth terminal (k2) of the first three-phase mutual inductance tester (1081), and the opposite-name end of the second high-voltage standard current transformer (1042) is connected to the fourth terminal (T 02 )connect; The opposite-name end of the first current transformer under test (1074) and the opposite-name end of the second current transformer under test (1075) are connected to the second end of the first resistor (Z1) and the second end of the second resistor (Z2); The first end of the first resistor (Z1) is connected to the first connection terminal (T X1 )connect; The first end of the second resistor (Z2) is connected to the second terminal (TX2 )connect.

[0029] The seventh connection terminal (D) of the three-phase mutual inductance tester (108) is connected to the ground terminal.

[0030] The first-phase live wire (A) runs through the first high-voltage standard current transformer (1041) and the first tested current transformer (1074); The third-phase live wire (C) runs through the second high-voltage standard current transformer (1042) and the second tested current transformer (1075); The second high-voltage standard current transformer (1042) is also used for when no measures are taken to reduce the influence of leakage current in the design and manufacture of the high-voltage standard current transformer, the leakage current will flow through the secondary winding of the high-voltage standard current transformer, causing additional errors to the high-voltage standard current transformer.

[0031] In one embodiment, the accuracy level of the current transformer for measurement is generally 0.2S. The regulations stipulate that the high-voltage standard current transformer must usually be two accuracy levels higher than the current transformer under test. Therefore, the accuracy level of the high-voltage standard current transformer should be at least 0.05S.

[0032] In one embodiment, when the primary power factor is calculated as 0.99 (inductive), the primary voltage leads the primary current by about 8°. For a current transformer operating at a voltage level of 10 kV, according to the leakage resistance (2.3×10 7 Ω) to calculate the leakage current Ic = 0.25mA during operation. The ideal secondary current of the high-voltage standard current transformer is 5A. If the high-voltage standard current transformer has the same leakage current under high operating voltage, the influence of the leakage current on the error of the high-voltage standard current transformer can be calculated as shown in Table 1. It can be seen that when the current is small (below 20% of the rated current), the influence of the leakage current on the error of the high-voltage standard current transformer has far exceeded its error limit requirement. Therefore, in order to use the high-voltage standard current transformer to accurately detect the current transformer error, strict requirements must be imposed on the design and process of the high-voltage standard current transformer to ensure that the influence of the leakage current on the high-voltage standard current transformer can be ignored.

[0033] Table 1 Effect of leakage current on the error of high voltage standard current transformer Rated current percentage (%) 1 5 20 100 120 Contrast difference influence (%) -0.500 -0.100 -0.025 -0.005 -0.004 Diagonal difference influence (') -17.026 -3.403 -0.851 -0.170 -0.141 Ratio difference limit (%) 0.10 0.05 0.05 0.05 0.05 Angle difference limit (') 4 2 2 2 2 In order to realize the error detection of three-phase three-element combination transformer by three-phase method, a self-rising high-voltage standard current transformer is designed to prevent leakage current. The high-voltage standard current transformer provided by this scheme increases the insulation level of the primary winding, secondary winding and shell, so that the high-voltage standard current transformer can meet the error detection of 10kV voltage level current transformer under rated voltage; add a grounding shielding layer between the primary winding, the secondary winding and the core, so that the leakage current of the high-voltage standard current transformer will not flow directly into the secondary winding, but directly into the earth through the shielding layer, avoiding the influence of the leakage current directly flowing into the secondary winding on the accuracy of the high-voltage standard current transformer; the shielding layer is grounded through the compensation winding to eliminate the influence of the leakage current on the accuracy of the high-voltage standard current transformer through the primary winding and induction to the secondary winding.

[0034] Figure 3 The present application provides a voltage error detection circuit of a three-phase three-element combination transformer, which is applied to the error detection test system of the three-phase three-element combination transformer. The voltage error detection circuit of the three-phase three-element combination transformer also includes a third resistor (Y a )、The fourth resistor (Y b ) and the fifth resistor (Y c ); The second three-phase voltage regulator (1012), the third voltage regulator (10121), the fourth voltage regulator (10122) and the fifth voltage regulator (10123); The input end of the third voltage regulator (10121), the input end of the fourth voltage regulator (10122) and the input end of the fifth voltage regulator (10123) are connected to each other and connected to the test signal; The output end of the third voltage regulator (10121), the output end of the fourth voltage regulator (10122) and the output end of the fifth voltage regulator (10123) are connected to a common end; The adjustable end of the third voltage regulator (10121) is connected to the first end of the input winding of the first booster (1031); The adjustable end of the fourth voltage regulator (10122) is connected to the first end of the input winding of the second booster (1032); The adjustable end of the fifth voltage regulator (10123) is connected to the first end of the input winding of the third booster (1033); The second end of the input winding of the first booster (1031) is connected to the second end of the input winding of the second booster (1032) and the second end of the input winding of the second booster (1033), and is connected to a common end; The first end of the output winding of the first booster (1031) is connected to the first end of the input winding of the first tested voltage transformer (1071) and the first end of the input winding of the first standard voltage transformer (1051); The first end of the output winding of the second booster (1032) is connected to the first end of the input winding of the second tested voltage transformer (1072) and the first end of the input winding of the second standard voltage transformer (1052); The first end of the output winding of the third booster (1033) is connected to the first end of the input winding of the third tested voltage transformer (1073) and the first end of the input winding of the third standard voltage transformer (1053); The second end of the output winding of the first booster (1031) is connected to the second end of the output winding of the second booster (1032), the second end of the output winding of the third booster (1033), and the ground end; The second end of the input winding of the first tested voltage transformer (1071) is connected to the second end of the input winding of the second tested voltage transformer (1072) and the second end of the input winding of the third tested voltage transformer (1073); The first end of the output winding of the first tested voltage transformer (1071) is connected to the first end of the output winding of the second tested voltage transformer (1072) and the first end of the output winding of the third tested voltage transformer (1073) and the third resistor (Y a ) and the first end of the fourth resistor (Y b ) and the first end of the fifth resistor (Y c ) is connected to the first end; The second end of the output winding of the first tested voltage transformer (1071) is connected to the third resistor (Y a ) is connected to the first end of the output winding of the first standard voltage transformer (1051) and the first connection terminal of the second three-phase mutual inductance tester (1082); The second end of the output winding of the second tested voltage transformer (1072) is connected to the fourth resistor (Y b ) is connected to the first end of the output winding of the second standard voltage transformer (1052) and the third terminal of the second three-phase mutual inductance tester (1082); The second end of the output winding of the third tested voltage transformer (1073) is connected to the fifth resistor (Y c ) is connected to the first end of the output winding of the third standard voltage transformer (1053) and the fifth terminal of the second three-phase mutual inductance tester (1082); The second end of the input winding of the first standard voltage transformer (1051) is connected to the second end of the input winding of the second standard voltage transformer (1052) and the second end of the input winding of the third standard voltage transformer (1053); The second end of the output winding of the first standard voltage transformer (1051) is connected to the second wiring terminal (X1) and the seventh wiring terminal (k1) of the second three-phase mutual inductance tester (1082); The second end of the output winding of the second standard voltage transformer (1052) is connected to the fourth terminal (X2) and the eighth terminal (k2) of the second three-phase mutual inductance tester (1082); The second end of the output winding of the third standard voltage transformer (1053) is connected to the sixth connection terminal (X3) and the ninth connection terminal (k3) of the second three-phase mutual inductance tester (1082).

[0035] The tenth connection terminal (D) of the second three-phase mutual inductance tester (1082) is connected to the ground terminal.

[0036] The input winding and the output winding are both three-phase power supply windings, and the third resistor (Y a )、The fourth resistor (Y b )、The fifth resistor (Y c ) The combined connection modes are Y connection (star connection), triangle connection and star-delta mixed connection, which are not limited here.

[0037] The Y-shaped connection is preferred, which has simple wiring, is easy to implement, and reduces the complexity of installation and maintenance. It has a wide range of applications and is suitable for most three-phase motors, especially motors with lower power.

[0038] Among them, the three-phase voltage regulator on the equipment side is AC input and connected to the test signal, that is, connecting the photovoltaic inverter and the energy storage substation equipment.

[0039] Among them, three sets of standard voltage transformers are connected to the three-phase power supply respectively, and the three-phase power supply provides current to the output winding through sinusoidal alternating current. The three-phase windings are arranged on the stator of the motor at an interval of 120 degrees, and each winding is designed with different turns to enhance the rotation effect of the magnetic field.

[0040] Through the three-phase three-element combination transformer voltage test system, which consists of two forms, namely, a three-phase combination transformer and a combination of multiple voltage transformers and multiple current transformers, the influence of leakage current generated by high voltage on the current transformer error is analyzed, a high-voltage standard current transformer for three-phase detection is developed, and a three-phase three-element combination transformer error detection test platform is built to realize the three-phase detection of the three-phase three-element combination transformer error. Therefore, compared with the three-phase detection circuit used in the prior art, the embodiment of the present application uses a three-phase three-element combination transformer error detection platform to simulate the operating conditions under different loads, and carries out the measurement performance detection of the three-phase three-element combination transformer, analyzes the error characteristics of the three-phase three-element combination transformer, and can ensure that it has good measurement performance under the operating conditions. At the same time, it can reduce the probability of false alarms of the measurement and control unit, thereby improving the accuracy and reliability of ground fault identification.

[0041] In addition, the present invention also provides a computer-readable storage medium, such as a chip, a CD, etc., on which an execution program is stored. When the execution program is executed, the circuit described in any one of the above items is implemented.

[0042] It should be noted that the computer-readable storage medium described in the embodiments of the present disclosure is not limited to the above-mentioned embodiments, and may also be, for example, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, device or device, or any combination thereof. More specific examples of computer-readable storage media may include, but are not limited to: an electrical connection with one or more wires, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination thereof. In the embodiments of the present disclosure, a computer-readable storage medium may be any tangible medium containing or storing a program, which may be used by or in combination with an instruction execution system, device, or device.

[0043] It will be appreciated by those skilled in the art that, under the premise of no conflict, the above-mentioned preferred solutions can be freely combined and superimposed. Among them, the flowcharts and block diagrams in the accompanying drawings illustrate the possible architecture, functions and operations of the systems, circuits and computer program products according to various embodiments of the present disclosure. In this regard, each box in the flowchart or block diagram can represent a module, a program segment, or a part of a code, and the module, program segment, or a part of a code contains one or more executable instructions for implementing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the box can also occur in a different order from the order marked in the accompanying drawings, for example, two boxes represented in succession can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each box in the block diagram and / or flowchart, and the combination of boxes in the block diagram and / or flowchart can be implemented with a dedicated hardware-based system that performs a specified function or operation, or can be implemented with a combination of dedicated hardware and computer instructions. The numbering of each step in this article is only for the convenience of description and reference, and is not used to limit the order of execution. The specific execution order is determined by the technology itself, and those skilled in the art can determine various allowable and reasonable orders based on the technology itself.

[0044] It should be noted that the step numbers (letters or numbers) used in the present invention to refer to certain specific circuit steps are only for the purpose of convenience and simplicity of description, and are by no means intended to limit the order of these circuit steps. Those skilled in the art will understand that the order of the relevant circuit steps should be determined by the technology itself and should not be inappropriately limited by the existence of the step numbers. Those skilled in the art can determine various permissible and reasonable step orders based on the technology itself.

[0045] Those skilled in the art will appreciate that, without conflict, the above-mentioned preferred solutions can be freely combined and superimposed.

[0046] It should be understood that the above-mentioned embodiments are merely illustrative and not restrictive. Without departing from the basic principles of the present invention, various obvious or equivalent modifications or substitutions that can be made by those skilled in the art to the above-mentioned details will be included in the scope of the claims of the present invention.

Claims

1. An error detection test system for a three-phase three-element combination transformer, characterized in that: It includes a first three-phase voltage regulator, a second three-phase voltage regulator, a first current booster, a second current booster, a third current booster, a first voltage booster, a second voltage booster, a third voltage booster, a first high-voltage standard current transformer, a second high-voltage standard current transformer, a third high-voltage standard current transformer, a first standard voltage transformer, a second standard voltage transformer, a third standard voltage transformer, a current and voltage load box, a tested three-phase three-element combination transformer, and a three-phase mutual inductance tester; The three-phase three-element combination transformer under test includes a first voltage transformer under test, a second voltage transformer under test, a third voltage transformer under test, a first current transformer under test, a second current transformer under test, and a third current transformer under test; The three-phase induction tester includes a first three-phase induction tester and a second three-phase induction tester; The first three-phase mutual inductance tester includes a first terminal, a second terminal, a third terminal, a fourth terminal, a fifth terminal, a sixth terminal and a seventh terminal; The second three-phase mutual inductance tester includes a first terminal, a second terminal, a third terminal, a fourth terminal, a fifth terminal, a sixth terminal, a seventh terminal, an eighth terminal, a ninth terminal, and a tenth terminal.

2. The error detection test system of a three-phase three-element combination transformer according to claim 1 is characterized in that: The input end of the first three-phase voltage regulator is connected to the input end of the second three-phase voltage regulator and is connected to a test signal; The output end of the first three-phase voltage regulator is connected to the input end of the first current booster, the input end of the second current booster and the input end of the third current booster; The output end of the first high-voltage standard current transformer is connected to the first input end of the tested three-phase three-element combination transformer; The output end of the second high-voltage standard current transformer is connected to the second input end of the tested three-phase three-element combination transformer; The output terminal of the third high-voltage standard current transformer is connected to the third input terminal of the tested three-phase three-element combination transformer; The output end of the second three-phase voltage regulator is connected to the input end of the first booster, the input end of the second booster and the input end of the third booster; The output end of the first booster is connected to the input end of the first standard voltage transformer and the fourth input end of the tested three-phase three-element combination transformer; The output end of the second booster is connected to the input end of the second standard voltage transformer and the fifth input end of the tested three-phase three-element combination transformer; The output end of the third booster is connected to the input end of the third standard voltage transformer and the sixth input end of the tested three-phase three-element combination transformer.

3. The error detection test system of a three-phase three-element combination transformer according to claim 2 is characterized in that: The output end of the current and voltage load box is connected to the seventh input end of the tested three-phase three-element combination transformer.

4. The error detection test system of a three-phase three-element combination transformer according to claim 3 is characterized in that: The output end of the tested three-phase three-element combination mutual inductor is connected to the input end of the three-phase mutual inductance tester.

5. A current error detection circuit of a three-phase two-element combination transformer, applied to an error detection test system of a three-phase three-element combination transformer as claimed in any one of claims 1 to 4, characterized in that: Also included is a first resistor and a second resistor; The first three-phase voltage regulator includes a first voltage regulator and a second voltage regulator; The input end of the first voltage regulator is connected to the input end of the second voltage regulator and is connected to the test signal; The output end of the first voltage regulator, the output end of the second voltage regulator, the second end of the input winding of the first current booster and the second end of the input winding of the third current booster are connected and connected to a common end; The adjustable end of the first voltage regulator is connected to the first end of the input winding of the first current booster; The adjustable end of the second voltage regulator is connected to the first end of the input winding of the third current booster; A first end of the output winding of the first current booster is connected to one end of the first phase live wire, and a second end of the output winding of the first current booster is connected to the other end of the first phase live wire; A first end of the output winding of the third current booster is connected to one end of the third-phase live wire, and a second end of the output winding of the third current booster is connected to the other end of the third-phase live wire.

6. A current error detection circuit for a three-phase two-element combination transformer according to claim 5, characterized in that: The same-name end of the first high-voltage standard current transformer is connected to the same-name end of the first current transformer under test and the fifth terminal of the first three-phase inductance tester, and the opposite-name end of the first high-voltage standard current transformer is connected to the third terminal of the first three-phase inductance tester; The same-name end of the second high-voltage standard current transformer is connected to the same-name end of the second current transformer under test and the sixth terminal of the first three-phase inductance tester, and the opposite-name end of the second high-voltage standard current transformer is connected to the fourth terminal of the first three-phase inductance tester; The opposite-name end of the first current transformer under test is connected to the opposite-name end of the second current transformer under test, the second end of the first resistor, the second end of the second resistor and the ground terminal; The first end of the first resistor is connected to the first terminal of the first three-phase mutual inductance tester; The first end of the second resistor is connected to the second terminal of the first three-phase mutual inductance tester; The seventh terminal of the first three-phase mutual inductance tester is connected to the ground terminal.

7. A current error detection circuit for a three-phase two-element combination transformer according to claim 5, characterized in that: The first-phase live wire runs through the first high-voltage standard current transformer and the first tested current transformer; The third-phase live wire runs through the second high-voltage standard current transformer and the second tested current transformer.

8. A voltage error detection circuit of a three-phase three-element combination transformer, applied to a three-phase three-element combination transformer error detection test system as claimed in any one of claims 1 to 4, characterized in that: Also included are a third resistor, a fourth resistor and a fifth resistor; The second three-phase voltage regulator includes a third voltage regulator, a fourth voltage regulator and a fifth voltage regulator; The input end of the third voltage regulator, the input end of the fourth voltage regulator and the input end of the fifth voltage regulator are connected to each other and connected to the test signal; The output end of the third voltage regulator, the output end of the fourth voltage regulator and the output end of the fifth voltage regulator are connected to a common end; The adjustable end of the third voltage regulator is connected to the first end of the input winding of the first booster; The adjustable end of the fourth voltage regulator is connected to the first end of the input winding of the second booster; The adjustable end of the fifth voltage regulator is connected to the first end of the input winding of the third booster; The second end of the input winding of the first booster is connected to the second end of the input winding of the second booster and the second end of the input winding of the second booster, and is connected to a common end; The first end of the output winding of the first booster is connected to the first end of the input winding of the first tested voltage transformer and the first end of the input winding of the first standard voltage transformer; The first end of the output winding of the second booster is connected to the first end of the input winding of the second tested voltage transformer and the first end of the input winding of the second standard voltage transformer; The first end of the output winding of the third booster is connected to the first end of the input winding of the third tested voltage transformer and the first end of the input winding of the third standard voltage transformer; The second end of the output winding of the first booster is connected to the second end of the output winding of the second booster, the second end of the output winding of the third booster and the ground; The second end of the input winding of the first tested voltage transformer is connected to the second end of the input winding of the second tested voltage transformer and the second end of the input winding of the third tested voltage transformer; The first end of the output winding of the first tested voltage transformer is connected to the first end of the output winding of the second tested voltage transformer, the first end of the output winding of the third tested voltage transformer, the first end of the third resistor, the first end of the fourth resistor, and the first end of the fifth resistor; The second end of the output winding of the first tested voltage transformer is connected to the second end of the third resistor, the first end of the output winding of the first standard voltage transformer, and the first terminal of the second three-phase mutual inductance tester; The second end of the output winding of the second tested voltage transformer is connected to the second end of the fourth resistor, the first end of the output winding of the second standard voltage transformer, and the third terminal of the second three-phase mutual inductance tester; The second end of the output winding of the third tested voltage transformer is connected to the second end of the fifth resistor, the first end of the output winding of the third standard voltage transformer, and the fifth terminal of the second three-phase mutual inductance tester.

9. The voltage error detection circuit of a three-phase three-element combination transformer according to claim 8, characterized in that: The second end of the input winding of the first standard voltage transformer is connected to the second end of the input winding of the second standard voltage transformer and the second end of the input winding of the third standard voltage transformer; The second end of the output winding of the first standard voltage transformer is connected to the second wiring terminal and the seventh wiring terminal of the second three-phase mutual inductance tester; The second end of the output winding of the second standard voltage transformer is connected to the fourth terminal and the eighth terminal of the second three-phase mutual inductance tester; The second end of the output winding of the third standard voltage transformer is connected to the sixth terminal and the ninth terminal of the second three-phase mutual inductance tester.

10. The voltage error detection circuit of a three-phase three-element combination transformer according to claim 8, characterized in that: The tenth terminal of the second and third mutual inductance tester is connected to the ground terminal.

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