A method and apparatus for identifying secondary current loop wiring under load testing

Abstract

This invention discloses a method for identifying the wiring of a secondary current loop during load testing, including inputting a verified reference voltage U. A The active power P, reactive power Q, current measurement phase CT polarity, and transformer winding connection information of the bus where the reference voltage is located; calculate the power compensation angle η. g And compensate for the phase of the current measurement; determine whether polarity compensation angle η needs to be considered. k and winding compensation angle η t If necessary, compensation is performed; based on the compensation result, the discrimination phase is obtained and corrected, and the wiring condition is determined by comparing it with the characteristic phase. This invention summarizes and analyzes the characteristic phases of different wiring of the secondary current circuit, analyzes the influence of load power, CT wiring method, transformer winding on the current phase, and angle compensation method, and can adapt to the discrimination needs under different load power, different CT wiring, and different primary equipment conditions on site.

Description

Technical Field

[0001] This invention relates to the field of power system technology, and in particular to a method and apparatus for identifying the wiring of secondary current circuits during load testing. Background Technology

[0002] Currently, determining the polarity and phase sequence of current loops during on-site load testing remains primarily manual. On-site personnel measure voltage and current phases and draw vector diagrams to judge wiring correctness. However, the drawing process is cumbersome and influenced by personnel experience, resulting in inconsistent accuracy and timeliness. Summarizing commonly used vector diagrams and wiring analyses, and using calculation software to draw vector diagrams, are direct methods to improve the efficiency and accuracy of manual judgment. Summarizing the characteristic phases of different incorrect wiring further enhances personnel's judgment ability, but the latter rarely considers the impact of different load power on phase characteristics, making it ineffective in identifying incorrect wiring under different load conditions. While these methods improve upon the shortcomings of manual judgment, they cannot achieve automatic wiring identification. The power discrimination method is the mainstream method for automatically determining the correctness of current loop wiring during load testing. It compares the actual power direction with the power calculated from sampling to achieve judgment, but it has not yet implemented specific incorrect wiring analysis, providing limited assistance in finding incorrect wiring on-site. Summary of the Invention

[0003] The purpose of this section is to outline some aspects of embodiments of the present invention and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, to avoid obscuring the purpose of these documents; however, such simplifications or omissions should not be construed as limiting the scope of the invention.

[0004] In view of the problems existing in the above and / or existing methods for determining the polarity of current loops and the correctness of phase sequence wiring in field load testing, this invention is proposed.

[0005] Therefore, the problem to be solved by this invention is how to achieve automatic wiring identification.

[0006] To solve the above-mentioned technical problems, the present invention provides the following technical solution:

[0007] In a first aspect, embodiments of the present invention provide a method for determining the wiring of a secondary current loop during load testing, comprising inputting a verified reference voltage U. A Active power P, reactive power Q, and current measurement phase of the bus where the reference voltage is located. CT polarity and transformer winding connection information;

[0008] Calculate the power compensation angle η g and the phase of the current measurement Provide compensation;

[0009] Determine whether polarity compensation angle η needs to be considered. k and winding compensation angle η t Compensation will be provided if necessary.

[0010] The discriminant phase is obtained based on the compensated result. And on Correction processing is performed by comparing with the characteristic phase. Compare the data to determine the wiring condition.

[0011] As a preferred embodiment of the load test secondary current circuit wiring discrimination method of the present invention, the wiring situation includes five incorrect wiring situations: the leading phase is connected to the main phase after the polarity is reversed, the lagging phase is connected to the main phase, the main phase is connected to the reverse polarity, the leading phase is connected to the main phase, and the lagging phase is connected to the main phase after the polarity is reversed, as well as the wiring situation where the main phase is correctly connected.

[0012] As a preferred embodiment of the load testing secondary current circuit wiring discrimination method of the present invention, wherein: the calculated power compensation angle η g and the phase of the current measurement Compensation includes,

[0013] The power compensation angle η g Calculated based on the actual power data of the bus where the reference voltage is located, defining power outflow from the bus as positive and power inflow from the bus as negative, the calculation formula is as follows:

[0014]

[0015] Pseudo-standard phase after power compensation

[0016] As a preferred embodiment of the load testing secondary current circuit wiring discrimination method of the present invention, wherein: the determination of whether polarity compensation angle η needs to be considered k and winding compensation angle η t If necessary, compensation will be provided, including:

[0017] When the primary polarity of CT2 is inconsistent with that of CT1 on the reference voltage bus side in the same current direction, the phase of the secondary current of CT2 needs to be considered for polarity compensation angle η. k ;

[0018] Pseudo-standard phase after obtaining polarity compensation

[0019] As a preferred embodiment of the load testing secondary current circuit wiring discrimination method of the present invention, wherein: the determination of whether polarity compensation angle η needs to be considered k and winding compensation angle η t If necessary, compensation may also include,

[0020] When there is a power transformer between CT1 and CT2, the winding compensation angle η needs to be considered. t ;

[0021] Pseudo-standard phase after winding compensation

[0022] As a preferred embodiment of the load testing secondary current loop wiring discrimination method of the present invention, wherein: the discrimination phase is obtained based on the compensated result. And on Correction processing includes,

[0023] right Perform equivalent rotations, including those on Rotate counterclockwise by 0° to Rotate 120° counterclockwise. Rotate 240° counterclockwise to obtain the discrimination phase.

[0024]

[0025] right Correction processing Where n is an integer, such that

[0026] As a preferred embodiment of the load testing secondary current circuit wiring discrimination method of the present invention, wherein: the step of determining the wiring of the secondary current circuit by means of characteristic phase The comparison is performed to determine the wiring condition, including:

[0027] Characteristic phase The phase of the three-phase current is indicated by i, where i = {1, 2, ..., 6} represents the i-th wiring configuration.

[0028] when Determine the phase current to correspond to the i-th wiring configuration.

[0029] Secondly, embodiments of the present invention provide a secondary current loop wiring discrimination system for under-load testing, comprising:

[0030] The data acquisition module is used to input the verified reference voltage U. A Active power P, reactive power Q, and current measurement phase of the bus where the reference voltage is located. CT polarity and transformer winding connection information;

[0031] The phase angle compensation module is used to determine and calculate the power compensation angle η. g Polarity compensation angle η k and winding compensation angle η t and the phase of the current measurement Provide compensation;

[0032] The wiring discrimination module is used to obtain the discrimination phase based on the compensated result. And on Correction processing is performed by comparing with the characteristic phase. Compare the data to determine the wiring condition.

[0033] Thirdly, embodiments of the present invention provide a computer device, including a memory and a processor, wherein the memory stores a computer program, and the processor executes the computer program to implement any step of the above-described method.

[0034] Fourthly, embodiments of the present invention provide a computer-readable storage medium having a computer program stored thereon, wherein the computer program, when executed by a processor, implements any step of the above-described method.

[0035] The beneficial effects of this invention are as follows: It summarizes and analyzes the characteristic phases of different wiring configurations in secondary current circuits, analyzes the influence of load power, CT wiring method, and transformer winding on the current phase, and proposes an algorithm for wiring discrimination based on current characteristic phases. This algorithm automatically analyzes and discriminates over 40 types of current circuit polarity and phase sequence errors. It can adapt to the discrimination needs under different load power, different CT wiring, and different primary equipment conditions. It transforms manual experience-based judgment when judging abnormal directional data under load into intelligent and digital judgment, compensating for the shortcomings of insufficient experience and slow analysis by different personnel when facing abnormal data. It adapts to the trend of intelligent and digital operation and maintenance, effectively shortens fault analysis time, provides effective guidance for fault diagnosis, ensures normal equipment operation, and the discrimination algorithm program is highly flexible. It can be further developed and promoted based on the existing waveform recording and information protection platform to improve the efficiency of intelligent operation and maintenance. Attached Figure Description

[0036] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Wherein:

[0037] Figure 1This is a flowchart of the method for determining the wiring of the secondary current loop during load testing.

[0038] Figure 2 This is a typical phase diagram of three-phase current versus reference voltage.

[0039] Figure 3 This is a diagram showing the compensation angle and primary equipment wiring.

[0040] Figure 4 This is a schematic diagram of the wiring for the measurement circuit on the low-voltage side of the transformer. Detailed Implementation

[0041] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.

[0042] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0043] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that is mutually exclusive with other embodiments.

[0044] This invention is described in detail with reference to the schematic diagrams. When detailing the embodiments of this invention, for ease of explanation, the cross-sectional views illustrating the device structure may be partially enlarged, not adhering to the usual scale. Furthermore, the schematic diagrams are merely examples and should not be construed as limiting the scope of protection of this invention. In actual fabrication, the three-dimensional spatial dimensions of length, width, and depth should be included.

[0045] Furthermore, in the description of this invention, it should be noted that the terms "upper," "lower," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are used solely for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. In addition, the terms "first," "second," or "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0046] Unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" in this invention should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; similarly, they can refer to mechanical connections, electrical connections, or direct connections, or indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0047] Example 1

[0048] Reference Figure 1 and Figure 2 This is the first embodiment of the present invention, which provides a method for identifying the wiring of the secondary current circuit during load testing.

[0049] It should be noted that on-site load testing typically uses the A-phase voltage U of the highest voltage level in that interval. A Based on U A The angle of the leading current is taken as the current phase. When the secondary current loop is correctly wired and the power factor is 1, the typical phase of the three-phase current relative to the reference voltage is as follows: Figure 2 As shown, the reference voltage U A With a phase of 0°, the phases of the three-phase currents A, B, and C are 0°, 120°, and 240° respectively. These three-phase currents are defined as standard currents. Its phase is the standard phase. Where φ∈{A,B,C}.

[0050] Furthermore, when the polarity and phase sequence of the secondary current circuit are incorrectly connected, the error characteristics are reflected in the current phase. Based on the phase sequence and polarity characteristics, incorrect connections of any phase in the secondary current circuit can be categorized into the following five types: 1) Leading phase connected with reversed polarity and then connected to the current phase; 2) Lagging phase connected to the current phase; 3) Current phase connected with reversed polarity; 4) Leading phase connected to the current phase; 5) Lagging phase connected with reversed polarity and then connected to the current phase. Based on the standard phase, the indicator phase θ corresponding to incorrect connections in the A, B, and C three-phase current circuits is analyzed. A θ B θ C As shown in Table 1. Taking phase A as an example, when "the polarity of the leading phase is reversed and then connected to the main phase", there is... When "the lag connects to the original state", there is When the "original polarity is reversed", there is θ B θ C Similar. Among them These are all standard phases when the wiring is correct.

[0051] Table 1. Three-phase current phases under different wiring configurations.

[0052]

[0053]

[0054] Since phases B and C can be considered as being obtained by rotating phase A clockwise by 120° and 240° respectively, in order to optimize the feature criteria, θ in Table 2 will be... B θ C The corresponding phases are rotated counterclockwise by 120° and 240° respectively, as shown in Table 2. The characteristic phase can be used uniformly to mark the phases of the three-phase currents. This indicates that i = {1, 2, ..., 6} represents the i-th wiring configuration in Table 2, in which the phases of the three-phase currents can all pass through... The comparison enables wiring identification.

[0055] Table 2. Six types of wiring characteristic phases

[0056]

[0057] Specifically, the steps of the load test secondary current circuit wiring identification method provided in this embodiment are as follows:

[0058] S100: Input the verified reference voltage, the active power P and reactive power Q of the bus where the reference voltage is located, and the current measurement phase. Information such as CT polarity and transformer windings.

[0059] It should be noted that in actual load testing, the actual current phase is not the standard phase. Factors such as load power, CT wiring (unless otherwise specified, in this embodiment, the CT wiring is Y / Y and uses a reduced polarity connection), and main transformer windings can all cause the actual current phase to deviate from the standard phase by an angle. The actual value of the angle deviation is affected by the power compensation angle η. g Polarity compensation angle η k Winding compensation angle η t The influence of this, therefore, when using actual current to measure phase... Before performing wiring identification, it is necessary to... Angle compensation corrections were performed to eliminate the influence of the above factors.

[0060] S200: Calculate the power compensation angle η g and the phase of the current measurement Compensation will be provided.

[0061] It should be noted that the power compensation angle is calculated based on the actual power data of the bus where the reference voltage is located, defining power outflow from the bus as positive and power inflow from the bus as negative. Figure 3 In (c), the bus voltage U of M is selected. AAs the reference voltage, affected by the power of bus M and the power of P and Q, the phase of the secondary current of CT1 is as follows: Figure 3 As shown in (a), when Q<0 and P>0, Offset The angle is η g1 When Q>0 and P<0, Offset The angle is η g2 The situations for phases B and C are similar. The power compensation angle η of the three-phase current... g It can be calculated as:

[0062]

[0063] S300: Determine whether polarity compensation angle needs to be considered. If so, then...

[0064] It should be noted that if the primary polarity of CT2 is inconsistent with that of CT1 on the reference voltage bus side in the same current direction, the phase of the secondary current of CT2 needs to take into account the polarity compensation angle.

[0065] by Figure 3 (c) Taking the primary wiring of the CT as an example for explanation: the current phase is based on the M bus U A Based on this, the primary current flows in from the polarity terminal of CT1 and flows out from the polarity terminal of CT2, such as... Figure 3 As shown in (b), the secondary current of phase A The phases are opposite, so if at this time... Return standard current The location not only requires compensation for η g It also needs to be compensated for by 180°.

[0066] Therefore, in Figure 3 (c) In: When M is the mother of U A As the reference voltage, for Regarding the non-polarity compensation angle, for Polarity compensation angle η k =180°; if N mother U A For the reference voltage, the above situation is reversed, for There is η k =180°, for Non-polarity compensation angle.

[0067] Similarly, for some CTs that use polarity-added wiring, it can be analyzed whether a polarity compensation angle of 180° needs to be considered based on the actual current conditions.

[0068] S400: Determine whether winding compensation angle needs to be considered. If so, then...

[0069] It should be noted that when there is a power transformer between CT1 and CT2, the winding compensation angle needs to be considered. In my country, the star winding of the transformer in the power plant usually adopts a 12-point connection method, and the delta winding usually adopts an 11-point connection method. At this time, the primary current flowing through the star winding will not produce an angle, but the current flowing through the delta winding will produce an angle. The phase of the latter current needs to take into account the winding compensation angle.

[0070] by Figure 3 Taking the YN / D11 transformer (d) as an example, the delta-side phase current of the main transformer leads the star-side phase current by 30°. Figure 3 In (b), when M (star-shaped side) U A As the reference voltage, the primary current flows through the transformer's delta winding and then rotates counterclockwise by 30° (corresponding to the secondary current as follows). As shown), when it flows through CT2 again, due to the opposite polarity, the phase of the secondary current changes by 180°. Advanced

[0071] Therefore, in Figure 3 (d) In: When M is the mother of U A As the reference voltage, No winding compensation angle, for There is a winding compensation angle η t = -30°; when N mother U A As the reference voltage, There is a winding compensation angle η t =30°, No winding compensation angle.

[0072] The above analysis assumes that the CT uses a Y / Y connection and that the primary and secondary currents of the CT are in phase. When the CT uses a Y / Δ connection, the winding compensation angle also needs to be considered.

[0073] S500: Yes Perform an equivalent rotation to obtain the discrimination phase. And on Correction processing is performed by comparing with the characteristic phase. Compare the data to determine the wiring condition.

[0074] Specifically, for Rotate counterclockwise by 0° to Rotate 120° counterclockwise. Rotate 240° counterclockwise to obtain the discrimination phase.

[0075]

[0076] It should be noted that after the above compensation and equivalent rotation, the current phase value may be less than 0. To facilitate judgment based on the characteristic phase, it is necessary to... Perform correction processing to make have

[0077]

[0078] Where n is an integer.

[0079] In actual measurements, due to the existence of errors, the angle is determined. It fluctuates before and after the corresponding characteristic phase. Considering that the actual error is usually no greater than 15°, it is assumed that when... Determine if the phase current corresponds to the i-th wiring configuration in Table 1.

[0080] Furthermore, this embodiment also provides a secondary current loop wiring discrimination system for on-load testing, including:

[0081] The data acquisition module is used to input and verify the reference voltage, the active power P and reactive power Q of the bus where the reference voltage is located, and the current measurement phase. CT polarity and transformer winding information;

[0082] The phase angle compensation module is used to determine and calculate the power compensation angle η. g Polarity compensation angle η k and winding compensation angle η t and the phase of the current measurement Provide compensation;

[0083] The wiring judgment module is used to obtain the discrimination phase based on the compensated result. And on Correction processing is performed by comparing with the characteristic phase. Compare the data to determine the wiring condition.

[0084] This embodiment also provides a computer device applicable to the method for determining the wiring of secondary current circuits during load testing, including:

[0085] The system includes a memory and a processor. The memory stores computer-executable instructions, and the processor executes these instructions to implement the load test secondary current loop wiring identification method proposed in the above embodiments.

[0086] The computer device can be a terminal, comprising a processor, memory, communication interface, display screen, and input devices connected via a system bus. The processor provides computing and control capabilities. The memory includes non-volatile storage media and internal memory. The non-volatile storage media stores the operating system and computer programs. The internal memory provides an environment for the operation of the operating system and computer programs stored in the non-volatile storage media. The communication interface is used for wired or wireless communication with external terminals; wireless communication can be achieved through Wi-Fi, carrier networks, NFC (Near Field Communication), or other technologies. The display screen can be an LCD screen or an e-ink screen. The input devices can be a touch layer covering the display screen, buttons, a trackball, or a touchpad on the computer device's casing, or an external keyboard, touchpad, or mouse.

[0087] This embodiment also provides a storage medium storing a computer program that, when executed by a processor, implements the method for determining the wiring of the secondary current loop during load testing as proposed in the above embodiments.

[0088] The storage medium proposed in this embodiment and the data storage method proposed in the above embodiments belong to the same inventive concept. Technical details not described in detail in this embodiment can be found in the above embodiments, and this embodiment has the same beneficial effects as the above embodiments.

[0089] Example 2

[0090] Reference Figures 2-4 This is the second embodiment of the present invention, which provides a method for determining the secondary current circuit wiring under load testing. The algorithm is written based on the Excel 2007 VBA module. To verify the beneficial effects, historical phase data from load testing and simulated test phase data from the device are used for verification. The historical phase data uses 110kV main transformer load test data, and the test phase data is generated using a PL661BE relay protection tester.

[0091] It should be noted that during the load test of the high-voltage side and low-voltage side of a certain 110kV YN / D11 main transformer, the polarities of the high-voltage side switch CT and the low-voltage side switch CT were opposite in the same current direction. The active power on the high-voltage side was 2.80MW, the reactive power was -1.93Mvar, and the power compensation angle was 325.4°.

[0092] With high voltage side U A Using the reference voltage, the current measurement phase, discrimination phase, and the results of each phase connection discrimination of the measurement circuit in the main transformer measurement and control panel are shown in Table 3.

[0093] Table 3. Transformer Measurement Circuit Wiring Determination Results

[0094]

[0095]

[0096] As shown in the table above, for the high-voltage side, after power factor angle compensation, equivalent rotation and correction, the three-phase currents are judged to have phases of 359.3°, 359.9° and 359.2°, respectively. After error comparison, all are judged to be "correct wiring". For the low-voltage side, with a transformer wiring compensation angle of -30°, the three-phase currents are compensated to 325.4° (power compensation angle), 180° (polarity compensation angle), and -30° (winding compensation angle), respectively. After equivalent rotation and correction, the phases are judged to have phases of 357.4°, 117.1° and 58.0°, respectively, corresponding to characteristic phases of 360°, 120° and 60°. The judgment result is: phase A is correctly wired, phase C is connected to phase B, phase B is connected to phase C after the polarity is reversed, that is, phase B polarity is reversed, phases B and C are swapped.

[0097] On-site inspection revealed incorrect wiring; the actual wiring situation is as follows: Figure 4 As shown, in the low-voltage side switchgear of the main transformer, the S1 (polarity end) and S2 (non-polarity end) cables of phase B, which are led from the CT junction box to the switchgear terminal block, are reversed on the terminal block. In addition, the B and C phase cables led from the switchgear terminal block to the main transformer monitoring and control panel are reversed. The investigation results are consistent with the judgment results.

[0098] The voltage and current output modules of the PL661BE relay protection tester were used to simulate the current phase under different power factors and different incorrect wiring conditions to further verify the correctness of the judgment method.

[0099] The simulated incorrect wiring types are shown in Table 4, among which, (Based on 0°) is the output reference voltage phase, and different values ​​represent different power factor angles; (Based on 0°) represents the phase of the instrument's output current; different values ​​indicate different incorrect wiring.

[0100] Table 4 Voltage, current, and phase output values ​​for different wiring errors

[0101]

[0102] Table 5 Measurement phase and discrimination phase for different wiring errors

[0103]

[0104] Table 6 Results of Different Wiring Errors

[0105]

[0106] Measurement phases corresponding to the four types of incorrect wiring and distinguishing phase As shown in Table 5, the test results are shown in Table 6.

[0107] Comparing Tables 4 and 6, the wiring identification is consistent with the simulation results. The test results show that under different power factor angles, this method can correctly identify a variety of complex incorrect wiring with different polarities and phase sequences.

[0108] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A method for identifying the wiring of a secondary current loop during load testing, characterized in that: include, Input the verified reference voltage U A Active power P, reactive power Q, and current measurement phase of the bus where the reference voltage is located. CT polarity and transformer winding connection information; Calculate the power compensation angle η g and the phase of the current measurement Provide compensation; The calculated power compensation angle η g and the phase of the current measurement Compensation includes, The power compensation angle ηg is calculated based on the actual power data of the bus where the reference voltage is located. Power flowing out of the bus is defined as positive, and power flowing into the bus is negative. The calculation formula is as follows: Pseudo-standard phase after power compensation Determine whether polarity compensation angle ηk and winding compensation angle ηt need to be considered. If so, perform compensation. The determination of whether polarity compensation angle ηk and winding compensation angle ηt need to be considered, and if so, compensation is performed, including... When the primary polarity of current transformer CT2 is inconsistent with that of current transformer CT1 on the reference voltage bus side in the same current direction, the secondary current phase of CT2 needs to take into account the polarity compensation angle ηk. Pseudo-standard phase after obtaining polarity compensation The determination of whether polarity compensation angle ηk and winding compensation angle ηt need to be considered, and if so, compensation, also includes... When there is a power transformer between CT1 and CT2, the winding compensation angle ηt needs to be considered; Pseudo-standard phase after winding compensation The discriminant phase is obtained based on the compensated result. And on Correction processing is performed by comparing with the characteristic phase. Compare the data to determine the wiring condition; The discriminant phase is obtained based on the compensated result. And on Correction processing includes, right Perform equivalent rotations, including those on Rotate counterclockwise by 0° to Rotate 120° counterclockwise. Rotate 240° counterclockwise to obtain the discrimination phase. right Correction processing Where n is an integer, such that The method with characteristic phase The comparison is performed to determine the wiring condition, including: Characteristic phase The phase of the three-phase current is indicated by i, where i = {1, 2, ..., 6} represents the i-th wiring configuration. when Determine the i-th wiring configuration corresponding to the phase current.

2. The method for determining the wiring of a secondary current loop under load as described in claim 1, characterized in that: The wiring conditions include five incorrect wiring conditions: the leading phase is connected to the main phase after the polarity is reversed, the lagging phase is connected to the main phase, the main phase is connected to the reverse polarity, the leading phase is connected to the main phase, and the lagging phase is connected to the main phase after the polarity is reversed, as well as the correct wiring conditions for the main phase.

3. A system for identifying the wiring of a secondary current loop during load testing, based on the method for identifying the wiring of a secondary current loop during load testing as described in claims 1-2, characterized in that: include, The data acquisition module is used to input the verified reference voltage U. A Active power P, reactive power Q, and current measurement phase of the bus where the reference voltage is located. CT polarity and transformer winding connection information; The phase angle compensation module is used to determine and calculate the power compensation angle η. g Polarity compensation angle η k and winding compensation angle η t and the phase of the current measurement Provide compensation; The wiring discrimination module is used to obtain the discrimination phase based on the compensated result. And on Correction processing is performed by comparing with the characteristic phase. Compare the data to determine the wiring condition.

4. A computer device comprising a memory and a processor, wherein the memory stores a computer program, characterized in that: When the processor executes the computer program, it implements the steps of the method according to any one of claims 1 to 2.

5. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, it implements the steps of the method according to any one of claims 1 to 2.

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