Three-phase lightning arrester test method, device, equipment, medium and program product

Abstract

The embodiment of the invention provides a three-phase lightning arrester test method, device and equipment, a medium and a program product. The method comprises the following steps: acquiring reference voltage and total current of each phase of the three-phase lightning arrester, determining an impedance angle of each phase of the three-phase lightning arrester, if an electrified body exists around the three-phase lightning arrester, constructing a phase interference model, and correcting the impedance angle of each phase through step-by-step compensation based on the model to obtain a phase interference model; and judging the insulation performance of the three-phase lightning arrester according to the quantitative relationship between the corrected impedance angle and a preset threshold value. The phase interference model can represent the interference of interference sources such as the current of the electrified body and the current of the target phase on the impedance angle, the measured impedance angle is corrected in this way, the influence on the impedance angle can be reduced, the impedance angle is closer to the true value of the impedance angle, and therefore the accuracy of judging the insulation performance of the three-phase lightning arrester according to the impedance angle can be improved.

Description

Technical Field

[0001] This application relates to the field of power grid testing technology, and in particular to a three-phase surge arrester testing method, apparatus, equipment, medium, and program product. Background Technology

[0002] Surge arresters are the core equipment for overvoltage protection in power grids. They are mainly responsible for limiting lightning overvoltages and switching overvoltages, and monitoring their insulation performance is crucial for power grid safety.

[0003] Currently, the testing of surge arrester insulation performance mainly relies on two methods: power outage testing and live testing. Power outage testing increases equipment downtime and grid operation risks, while live testing can be performed without interrupting grid equipment operation. However, under live conditions, the internal insulation state of the surge arrester is easily affected by external environmental factors, resulting in insufficient accuracy and difficulty in reflecting the true insulation state of the surge arrester. Summary of the Invention

[0004] This application provides a three-phase surge arrester testing method, apparatus, equipment, medium, and procedure to improve the accuracy of live surge arrester testing.

[0005] In a first aspect, embodiments of this application provide a three-phase surge arrester testing method, including:

[0006] Obtain the reference voltage and total current of each phase of the three-phase surge arrester;

[0007] The impedance angle of each phase of the three-phase surge arrester is determined based on the reference voltage and the total current.

[0008] In response to the determination that there is a charged body around the three-phase surge arrester, a phase interference model is constructed. The phase interference model characterizes the interference of multiple interference sources on the impedance angle. The multiple interference sources include the current of the charged body and the current of the target phase in the three-phase surge arrester. The target phase is the phase between the other two phases in the three phases.

[0009] Based on the phase interference model, the impedance angle of each phase is corrected through step-by-step compensation, and the insulation performance of the three-phase surge arrester is determined according to the quantitative relationship between the corrected impedance angle and the preset impedance threshold.

[0010] In one possible implementation, based on a phase interference model, the impedance angle of each phase is corrected through step-by-step compensation, including:

[0011] Determine the compensation amount corresponding to the target interference source in the phase interference model, and make an initial correction to the impedance angle affected by the target interference source. The target interference source is the current of a charged body or the current of the target phase.

[0012] After the initial correction, the compensation amounts corresponding to the other interference sources in the phase interference model are determined, and the impedance angle affected by the other interference sources is corrected.

[0013] In one possible implementation, after correcting the impedance angle of each phase through step-by-step compensation, the following is also included:

[0014] When the current of the charged body is the target interference source and the current of the target phase is the other interference source, the corrected impedance angles of each phase are denoted as the first type of impedance angles.

[0015] When the current of the target phase is the target interference source and the current of the charged body is the other interference source, the corrected impedance angles of each phase are denoted as the second type of impedance angles.

[0016] For any one of the three phases, calculate the weighted average of the first type of impedance angle and the second type of impedance angle as the corrected impedance angle.

[0017] In one possible implementation, the charged body is the A-phase busbar, the target phase is the B-phase, and based on the phase interference model, the impedance angle of each phase is corrected through step-by-step compensation, including:

[0018] The first compensation amount is calculated based on the impedance angles of phase B and phase C.

[0019] The impedance angle of phase B is corrected according to the first compensation amount to obtain the corrected impedance angle of phase B, and the impedance angle of phase C is corrected according to the first compensation amount to obtain the intermediate value of phase C correction.

[0020] The second compensation amount is calculated based on the impedance angle of phase A and the intermediate value of phase C after correction.

[0021] The impedance angles of phase A and phase C are corrected according to the second compensation amount to obtain the corrected impedance angles of phase A and phase C.

[0022] In one possible implementation, the charged body is the A-phase busbar, the target phase is the B-phase, and based on the phase interference model, the impedance angle of each phase is corrected through step-by-step compensation, including:

[0023] The third compensation amount is calculated based on the impedance angles of phase A and phase C.

[0024] The impedance angle of phase A is corrected according to the third compensation amount to obtain the corrected impedance angle of phase A, and the impedance angle of phase C is corrected according to the third compensation amount to obtain the intermediate value of phase C correction.

[0025] The fourth compensation amount is calculated based on the impedance angle of phase B and the intermediate value of phase C after correction.

[0026] The impedance angles of phase B and phase C are corrected according to the fourth compensation amount to obtain the corrected impedance angles of phase B and phase C.

[0027] In one possible implementation, the impedance angle of each phase is corrected through step-by-step compensation, including:

[0028] Calculate the difference between the impedance angles of any two phases. If the absolute value of the difference between the impedance angle of one phase and the impedance angle of the other phase is greater than the preset target threshold, then keep the impedance angle of this phase unchanged and correct the impedance angles of the other two phases.

[0029] Secondly, embodiments of this application provide a three-phase surge arrester testing device, comprising:

[0030] The acquisition module is used to acquire the reference voltage and total current of each phase of the three-phase surge arrester;

[0031] Impedance angle calculation module, used to determine the impedance angle of each phase of the three-phase surge arrester based on the reference voltage and total current;

[0032] The model building module is used to build a phase interference model in response to the determination that there is a charged body around the three-phase surge arrester. The phase interference model characterizes the interference of multiple interference sources on the impedance angle. The multiple interference sources include the current of the charged body and the current of the target phase in the three-phase surge arrester. The target phase is the phase between the other two phases in the three phases.

[0033] The correction module is used to correct the impedance angle of each phase through step-by-step compensation based on the phase interference model, and to determine the insulation performance of the three-phase surge arrester based on the quantitative relationship between the corrected impedance angle and the preset impedance threshold.

[0034] Thirdly, embodiments of this application provide an electronic device, including: a memory and a processor;

[0035] The memory stores the instructions that the computer executes;

[0036] The processor executes computer execution instructions stored in memory, causing the processor to perform the first aspect and / or various possible implementations of the first aspect as described above.

[0037] Fourthly, embodiments of this application provide a computer-readable storage medium storing computer-executable instructions, which, when executed by a processor, are used to implement the first aspect and / or various possible implementations of the first aspect.

[0038] Fifthly, embodiments of this application provide a computer program product, including a computer program that, when executed by a processor, implements the first aspect and / or various possible implementations of the first aspect.

[0039] The three-phase surge arrester testing method, apparatus, equipment, medium, and program products provided in this application can determine the impedance angle of each phase of the three-phase surge arrester by acquiring the reference voltage and total current of each phase. If there are charged bodies around the three-phase surge arrester, a phase interference model can be constructed, and the impedance angle of each phase can be corrected by step-by-step compensation based on this model. Then, the insulation performance of the three-phase surge arrester is determined according to the quantitative relationship between the corrected impedance angle and a preset threshold. The phase interference model can characterize the interference of interference sources such as the current of charged bodies and the current of the target phase on the impedance angle. By correcting the calculated impedance angle in this way, the influence of the impedance angle can be reduced, and the value of the impedance angle can be closer to the true value, thereby improving the accuracy of determining the insulation performance of the three-phase surge arrester based on the impedance angle. Attached Figure Description

[0040] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0041] Figure 1 An equivalent circuit diagram of a surge arrester is provided as an example in this application;

[0042] Figure 2 A flowchart illustrating a three-phase surge arrester testing method provided in this application embodiment;

[0043] Figure 3 A schematic diagram of an interference source for a phase interference model provided in this application embodiment;

[0044] Figure 4 A phase diagram of a phase interference model provided in an embodiment of this application;

[0045] Figure 5 A schematic diagram of a process for correcting the impedance angle provided in an embodiment of this application;

[0046] Figure 6 A schematic diagram of a three-phase surge arrester testing device provided in an embodiment of this application;

[0047] Figure 7 This is a schematic diagram of the structure of an electronic device provided in this application.

[0048] The accompanying drawings illustrate specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to particular embodiments. Detailed Implementation

[0049] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.

[0050] Zinc oxide surge arresters are crucial overvoltage protection devices in power grids, primarily responsible for limiting lightning and switching overvoltages, acting as a "safety valve" for power equipment. Their core function is to rapidly activate when a dangerous transient overvoltage occurs in the system, discharging the overvoltage energy to ground, thereby protecting expensive and critical transmission and transformation equipment such as transformers and switchgear from insulation breakdown damage. Therefore, the integrity of the surge arrester's insulation performance and its nonlinear resistance characteristics (especially for zinc oxide surge arresters) directly determines the reliability and effectiveness of its protective action. Once the internal insulation of the surge arrester deteriorates or the performance of the resistance elements declines, not only will its protective function be significantly reduced or fail, but in severe cases, it may even explode, causing power grid equipment accidents and threatening the safe and stable operation of the entire system.

[0051] Currently, the insulation performance test of surge arresters is generally divided into power-off test and power-on test. Figure 1 An equivalent circuit diagram of a surge arrester is provided as an example in this application. The following is in conjunction with… Figure 1 The principle of live-line testing of surge arresters is explained.

[0052] like Figure 1 As shown, the surge arrester contains an equivalent resistance R and an equivalent capacitance C. Under AC voltage U, the total current I of the surge arrester is... X It is the sum of the resistive current I1 flowing through R and the capacitive current I2 flowing through C. Under normal circumstances, the majority of the current in the surge arrester is I2, and the resistive current I1 accounts for only a small portion of I. X The resistive current I1 is about one-tenth of the normal value. However, when the insulation performance of the surge arrester deteriorates due to internal moisture or damage to insulation components, the resistive current I1 will be greater than the normal value. Therefore, it can be detected by measuring I1 and I... X The value is used to perform a live-line test on the insulation performance of the surge arrester. However, in practical applications, the accuracy of this live-line test is poor and often fails to reflect the true insulation performance of the surge arrester.

[0053] The inventors discovered through research that the low accuracy of live-line testing of surge arresters is due to the extremely small order of magnitude of the current within the arrester, making it difficult to effectively measure and determine the value of I1. The inventors also found that a decrease in the insulation performance of a surge arrester leads to a change in the current phase, which can be used to determine the arrester's insulation performance.

[0054] Based on this, a technical concept is proposed: the real-time impedance angle of the surge arrester is determined according to the phase of the reference voltage and real-time current; then, the real-time impedance angle is compared with the historical impedance angle of the surge arrester to obtain the difference between the current and historical insulation performance of the surge arrester. Considering that three-phase surge arresters are usually used in power grids, inter-phase interference between the three phases will affect the current phase and thus the authenticity and accuracy of the impedance angle. Furthermore, charged objects around the three-phase surge arrester may also affect the impedance angle. A multi-interference source analysis model can be established based on inter-phase interference and interference from surrounding charged objects. The real-time impedance angle is corrected based on the interference calculation compensation, making the corrected impedance angle closer to the true value of the surge arrester's impedance angle, thereby improving the accuracy of surge arrester insulation performance testing.

[0055] The technical solution of this application and how the technical solution of this application solves the above-mentioned technical problems are described in detail below with specific embodiments. These specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments. The embodiments of this application will be described below with reference to the accompanying drawings.

[0056] Figure 2 This is a flowchart illustrating a three-phase surge arrester testing method provided in an embodiment of this application, as shown below. Figure 2 As shown, the method includes:

[0057] Step S201: Obtain the reference voltage and total current of each phase of the three-phase surge arrester.

[0058] For example, equipment such as a surge arrester live-line tester or current sensor can be used to collect the total current I of each phase of the three-phase surge arrester. X The reference voltage U of each phase of the surge arrester can be obtained through the secondary terminals of the PT. The PT (Potential Transformer) can convert the high voltage on the bus side of the power grid into the low voltage on the secondary terminal side.

[0059] Step S202: Determine the impedance angle of each phase of the three-phase surge arrester based on the reference voltage and total current.

[0060] For example, for any one of phases A, B, and C, the total current and reference voltage of that phase can be Fourier transformed to obtain the fundamental values ​​of the current and voltage signals. By comparing the phases of the fundamental values ​​of the current and voltage signals, the impedance angle of that phase can be obtained.

[0061] Step S203: In response to determining that there is a charged body around the three-phase surge arrester, a phase interference model is constructed.

[0062] The phase interference model characterizes the interference of multiple sources on the impedance angle. These sources include the current in the charged body and the current in the target phase of the three-phase surge arrester. The target phase is the phase between the other two phases. For example, when surge arresters A, B, and C are arranged in a row, with surge arrester B positioned between phases A and C, the current in phase B is the target phase, and this current will interfere with the impedance angles of both phases A and C.

[0063] In this embodiment, the presence of a live conductor around the surge arrester can be detected manually, or it can be determined by using a location map of the power system where the surge arrester is located. If a live conductor is found within a preset range around the surge arrester, a phase interference model can be established based on the interference of the live conductor on the impedance angle of each phase and the interference between adjacent phase currents of the surge arrester.

[0064] Figure 3 This is a schematic diagram of the interference source for a phase interference model provided in an embodiment of this application.

[0065] like Figure 3 As shown, three-phase surge arresters are usually deployed close together. When the surge arrester is subjected to voltage, it will form stray capacitance, causing the current in phases A and C to shift to the middle phase B. This causes phase B to interfere with phases A and C, resulting in a decrease in the impedance angle of phase A and an increase in the resistive current, and an increase in the impedance angle of phase C and a decrease in the resistive current.

[0066] like Figure 3 As shown, the live conductors surrounding the surge arrester can be the power system busbars, which can be categorized into phase A, phase B, and phase C busbars based on their phase. The busbar closer to the surge arrester will affect the impedance angle. Figure 3 Taking the example shown, in a three-phase busbar, the A-phase busbar is closer to the surge arrester. The distance between the A-phase busbar and the three-phase surge arrester is equal, which can be regarded as the interference current of the A-phase busbar having the same effect on the surge arresters of the A-phase, B-phase and C-phase.

[0067] Step S204: Based on the phase interference model, the impedance angle of each phase is corrected through step-by-step compensation, and the insulation performance of the three-phase surge arrester is determined according to the quantitative relationship between the corrected impedance angle and the preset impedance threshold.

[0068] The impedance threshold can be determined based on historical data of the surge arrester or through pre-test calibration. For example, when the absolute value of the impedance angle is less than 75°, the insulation performance of the surge arrester is extremely poor; when the absolute value of the impedance angle is greater than 83° and less than 88°, the insulation performance of the surge arrester is excellent.

[0069] In this embodiment of the application, the interference of different interference sources on the impedance angle in the phase interference model can be eliminated in a step-by-step compensation manner. Based on step S202, the interference-affected impedance angle is corrected so that the corrected impedance angle is more in line with the true value. Then, the corrected impedance angle is compared with the impedance threshold, and the insulation performance of the surge arrester is determined based on the comparison result.

[0070] In the above embodiments, by acquiring the reference voltage and total current of each phase of the three-phase surge arrester, the impedance angle of each phase can be determined. If there are charged bodies around the three-phase surge arrester, a phase interference model can be constructed, and the impedance angle of each phase can be corrected through step-by-step compensation based on this model. Then, the insulation performance of the three-phase surge arrester is determined based on the quantitative relationship between the corrected impedance angle and a preset threshold. The phase interference model can characterize the interference of interference sources such as the current of charged bodies and the current of the target phase on the impedance angle. By correcting the calculated impedance angle in this way, the influence of the impedance angle can be reduced, making it closer to the true value of the impedance angle, thereby improving the accuracy of determining the insulation performance of the three-phase surge arrester based on the impedance angle.

[0071] Figure 4 This is a phase diagram of a phase interference model provided in an embodiment of this application. The interference sources of this phase interference model include phase-to-phase interference of the B-phase arrester current and interference from the A-phase busbar near the three-phase arrester, such as... Figure 4 As shown, U A U B and U C These are the reference voltages for phase A, phase B, and phase C surge arresters, respectively. A I B and I C These are the actual currents of phases A, B, and C, respectively, I. A '、 I B 'and I C These are the measured currents for phases A, B, and C, respectively. The actual current refers to the ideal current of the surge arrester under conditions unaffected by interference sources, while the measured current refers to the current measured under the influence of interference sources as characterized by the phase interference model.

[0072] It is understood that the current obtained in the embodiments of this application is the measured current, and the actual current cannot be obtained by measurement.

[0073] like Figure 4 As shown, φA, φB, and φC represent the true impedance angles corresponding to the actual current, while φA', φB', and φC' represent the measured impedance angles corresponding to the measured current. For example, φA' can be based on the reference voltage U. A and measuring current I A The phase difference of the fundamental value.

[0074] For phase A surge arrester, under the interference of phase A bus, the measured current increases, but the impedance angle φA' remains unchanged compared to φA; under the phase-to-phase interference of phase B current, the impedance angle φA' decreases compared to φA, and the change angle is φ2.

[0075] For the B-phase surge arrester, under the interference of the A-phase busbar, the measured current value does not change significantly, but the impedance angle φB' increases compared to φB, with a change angle of φ1. The B-phase surge arrester is not affected by the B-phase current.

[0076] For the C-phase surge arrester, under the interference of the A-phase bus, the measured current value does not change significantly, but the impedance angle φC' decreases compared to φC, with a change angle of φ1. Under the phase-to-phase interference of the B-phase current, the impedance angle φC' increases compared to φC, with a change angle of φ2. Considering the interference of the A-phase bus current and the B-phase surge arrester current on the C-phase surge arrester, the change angle of the C-phase impedance angle φC' compared to φC is φ3, where φ3 is the absolute value of the difference between φ1 and φ2. Based on this, we can deduce that φA' = φA - φ2; φB' = φB + φ1; φC' = φC - φ1 + φ2. According to the relationship between the measured and true values ​​of the impedance angles of each phase, the measured values ​​of the impedance angles of each phase can be corrected through step-by-step compensation, making the corrected values ​​closer to the true values.

[0077] In one embodiment, such as Figure 5 As shown, based on the phase interference model, the impedance angle of each phase is corrected through step-by-step compensation, including:

[0078] Step S501: Determine the compensation amount corresponding to the target interference source in the phase interference model, and make an initial correction to the impedance angle affected by the target interference source.

[0079] The target interference source is the current of a charged body or the current of the target phase.

[0080] Step S502: After the initial correction, determine the compensation amount corresponding to the other interference sources in the phase interference model, and correct the impedance angle affected by the other interference sources.

[0081] In this embodiment, there are two interference sources that affect the impedance angle of the surge arrester. One interference source is the current in the charged body. Figure 3 and Figure 4 Taking the example shown, the energized conductor is the A-phase busbar, and the other interference source is the current in the target phase. For phases A, B, and C, the target phase is phase B. In this situation, the interference sources can be selected step-by-step as correction targets. For example, the interference of the A-phase busbar to the three-phase surge arresters can be considered first, followed by the phase-to-phase interference caused by phase B; or the phase-to-phase interference caused by phase B can be considered first, followed by the interference of the A-phase busbar to the three-phase surge arresters. The order in which the interference sources are selected is not restricted.

[0082] In one embodiment, the charged conductor is the A-phase busbar. Based on the phase interference model, the impedance angle of each phase is corrected through step-by-step compensation, including:

[0083] Calculate the first compensation amount based on the impedance angles of phase B and phase C; correct the impedance angle of phase B based on the first compensation amount to obtain the corrected impedance angle of phase B, and correct the impedance angle of phase C based on the first compensation amount to obtain the corrected intermediate value of phase C; calculate the second compensation amount based on the impedance angle of phase A and the corrected intermediate value of phase C; correct the impedance angle of phase A and the corrected intermediate value of phase C based on the second compensation amount to obtain the corrected impedance angles of phase A and phase C.

[0084] In the embodiments of this application, the impedance angle of each phase is the measured impedance angle (i.e., the impedance angle measurement value) obtained based on the measured current. The calculation of the compensation amount and the impedance angle correction can be represented by the following process:

[0085] Δφ1=φB'-φC';φB1=φB'-(Δφ1) / 2;φC1=φC'+(Δφ1) / 2;

[0086] Δφ2=φC1-φA';φA1=φA'+(Δφ2) / 2;φC2=φC1-(Δφ2) / 2;

[0087] Where Δφ1 and Δφ2 represent the first compensation amount and the second compensation amount, respectively; φA1 and φB1 represent the corrected impedance angles of phase A and phase B, respectively; φC1 represents the intermediate value of phase C correction; and φC2 represents the corrected impedance angle of phase C.

[0088] In one embodiment, the charged conductor is the A-phase busbar. Based on the phase interference model, the impedance angle of each phase is corrected through step-by-step compensation, including:

[0089] The third compensation amount is calculated based on the impedance angles of phase A and phase C. The impedance angle of phase A is corrected based on the third compensation amount to obtain the corrected impedance angle of phase A. The impedance angle of phase C is also corrected based on the third compensation amount to obtain the intermediate value of phase C. The fourth compensation amount is calculated based on the impedance angle of phase B and the intermediate value of phase C. The impedance angles of phase B and phase C are corrected based on the fourth compensation amount to obtain the corrected impedance angles of phase B and phase C.

[0090] In the embodiments of this application, the impedance angle of each phase is the measured impedance angle (i.e., the impedance angle measurement value) obtained based on the measured current. The calculation of the compensation amount and the impedance angle correction can be represented by the following process:

[0091] Δφ3=φC'-φA';φA2=φA'+(Δφ3) / 2;φC3=φC'-(Δφ3) / 2;

[0092] Δφ4=φB'-φC3;φB2=φB'-(Δφ4) / 2;φC4=φC3+(Δφ4) / 2;

[0093] Where Δφ3 and Δφ4 represent the third and fourth compensation amounts, respectively; φA2 and φB2 represent the corrected impedance angles of phase A and phase B, respectively; φC3 represents the intermediate value of phase C correction; and φC4 represents the corrected impedance angle of phase C.

[0094] The following analysis, based on specific experimental data, examines the effectiveness of the step-by-step compensation in the above embodiments.

[0095]

[0096] Table 1

[0097]

[0098] Table 2

[0099]

[0100] Table 3

[0101]

[0102] Table 4

[0103] Tables 1 to 4 above show the measurement and correction results of the surge arresters under four different conditions, in the following order: no degradation of the three-phase surge arrester; degradation of phase A surge arrester; degradation of phase B surge arrester; and degradation of phase C surge arrester. Columns A1, B1, and C2 represent the values ​​after step-by-step compensation of the measured impedance angles of phases A, B, and C based on the first and second compensation amounts. Columns A2, B2, and C4 represent the values ​​after step-by-step compensation of the measured impedance angles of phases A, B, and C based on the third and fourth compensation amounts. As can be seen from the tables, the correction effects of using different sequences of step-by-step compensation in the two embodiments have their own advantages and disadvantages for surge arresters under different conditions.

[0104] In one embodiment, after correcting the impedance angle of each phase through step-by-step compensation, the method further includes:

[0105] The corrected impedance angles of each phase when the current of the charged body is the target interference source and the current of the target phase is the other interference source are denoted as the first type of impedance angle; the corrected impedance angles of each phase when the current of the target phase is the target interference source and the current of the charged body is the other interference source are denoted as the second type of impedance angle; for any phase of the three phases, the weighted average of the first type of impedance angle and the second type of impedance angle is calculated as the corrected impedance angle.

[0106] In the embodiments of this application, the corrected impedance angle of a certain phase can be calculated separately using different step-by-step compensation sequences, and then the impedance angles corrected in different sequences can be weighted and averaged. For example, the average value of the corrected impedance angles A1 and A2 in the above embodiments can be used as the final corrected impedance angle of phase A, thereby combining two compensation methods and improving the applicability of the scheme.

[0107]

[0108] Table 5

[0109]

[0110] Table 6

[0111]

[0112] Table 7

[0113]

[0114] Table 8

[0115] Tables 5 to 8 above show the results of comprehensive compensation for the examples in Tables 1 to 4. For example, Table 1 is a test example of a three-phase surge arrester without degradation, and Table 5 shows the results of combining two compensation methods for the corresponding example in Table 1; Table 2 is a test example of a phase A surge arrester with degradation, and Table 6 shows the results of combining two compensation methods for the corresponding example in Table 2, and so on.

[0116] As can be seen from Tables 5 to 8 above, under certain conditions of the three-phase surge arrester, such as no deterioration, the impedance angle obtained by the above comprehensive compensation method is closer to the true impedance angle.

[0117] In one embodiment, the impedance angle of each phase is corrected by step-by-step compensation, including:

[0118] Calculate the difference between the impedance angles of any two phases. If the absolute value of the difference between the impedance angle of one phase and the impedance angle of the other phase is greater than the preset target threshold, then keep the impedance angle of this phase unchanged and correct the impedance angles of the other two phases.

[0119] For example, the target threshold can be 6°.

[0120] In this embodiment, considering that if the insulation performance of a certain phase arrester deteriorates too severely, causing a significant difference in insulation performance compared to the other two phase arresters, continuing to use its measured impedance angle to calculate the compensation amount for correction would fail to reflect the true insulation performance of the arrester. To address this, the difference between the measured impedance angles of any two phases can be calculated first. If the impedance angle of a certain phase differs significantly from the impedance angles of the other phases, that phase's impedance angle is retained and not included in the compensation calculation or subsequent correction; only the impedance angles of the other two phases are compensated and corrected. This approach avoids the extreme insulation performance of a single phase arrester affecting the accuracy of the measurement, thus improving the accuracy of the arrester's live-line testing.

[0121] Figure 6 A schematic diagram of a three-phase surge arrester testing device provided in this application is shown below. Figure 6 As shown, the three-phase surge arrester testing device 600 provided in this embodiment includes:

[0122] The acquisition module 601 is used to acquire the reference voltage and total current of each phase of the three-phase surge arrester;

[0123] Impedance angle calculation module 602 is used to determine the impedance angle of each phase of the three-phase surge arrester based on the reference voltage and total current;

[0124] The model building module 603 is used to build a phase interference model in response to the determination that there is a charged body around the three-phase surge arrester. The phase interference model characterizes the interference of multiple interference sources on the impedance angle. The multiple interference sources include the current of the charged body and the current of the target phase in the three-phase surge arrester.

[0125] The correction module 604 is used to correct the impedance angle of each phase through step-by-step compensation based on the phase interference model, and to determine the insulation performance of the three-phase surge arrester based on the quantitative relationship between the corrected impedance angle and the preset impedance threshold.

[0126] In one possible implementation, the correction module 604 is further configured to: determine the compensation amount corresponding to the target interference source in the phase interference model, and perform an initial correction on the impedance angle affected by the target interference source, wherein the target interference source is the current of a charged body or the current of the target phase; after the initial correction, determine the compensation amount corresponding to the other interference sources in the phase interference model, and correct the impedance angle affected by the other interference sources.

[0127] In one possible implementation, the correction module 604 is further configured to: record the corrected impedance angles of each phase as first-type impedance angles when the current of the charged body is the target interference source and the current of the target phase is the other interference source; record the corrected impedance angles of each phase as second-type impedance angles when the current of the target phase is the target interference source and the current of the charged body is the other interference source; and calculate the weighted average of the first-type impedance angle and the second-type impedance angle as the corrected impedance angle for any one of the three phases.

[0128] In one possible implementation, the correction module 604 is further configured to: calculate a first compensation amount based on the impedance angle of phase B and the impedance angle of phase C; correct the impedance angle of phase B based on the first compensation amount to obtain the corrected impedance angle of phase B, and correct the impedance angle of phase C based on the first compensation amount to obtain the corrected intermediate value of phase C; calculate a second compensation amount based on the impedance angle of phase A and the corrected intermediate value of phase C; and correct the impedance angle of phase A and the corrected intermediate value of phase C based on the second compensation amount to obtain the corrected impedance angle of phase A and the corrected impedance angle of phase C.

[0129] In one possible implementation, the correction module 604 is further configured to: calculate a third compensation amount based on the impedance angle of phase A and the impedance angle of phase C; correct the impedance angle of phase A based on the third compensation amount to obtain the corrected impedance angle of phase A, and correct the impedance angle of phase C based on the third compensation amount to obtain the corrected intermediate value of phase C; calculate a fourth compensation amount based on the impedance angle of phase B and the corrected intermediate value of phase C; and correct the impedance angle of phase B and the corrected intermediate value of phase C based on the fourth compensation amount to obtain the corrected impedance angle of phase B and the corrected impedance angle of phase C.

[0130] In one possible implementation, the correction module 604 is further configured to: calculate the difference between the impedance angles of any two phases; if the absolute value of the difference between the impedance angle of one phase and the impedance angle of the other phase is greater than a preset target threshold, then the impedance angle of this phase is kept unchanged, and the impedance angles of the other two phases are corrected.

[0131] The three-phase surge arrester testing device provided in this embodiment can perform the method provided in the above-described method embodiment. Its implementation principle and technical effect are similar, and will not be described in detail here.

[0132] Figure 7 This is a schematic diagram of the structure of an electronic device provided in this application. Figure 7 As shown, the electronic device 70 provided in this embodiment includes at least one processor 701 and a memory 702. Optionally, the device 70 further includes a communication component 703. The processor 701, memory 702, and communication component 703 are connected via a bus 704.

[0133] In a specific implementation, at least one processor 701 executes computer execution instructions stored in memory 702, causing at least one processor 701 to perform the above-described method.

[0134] The specific implementation process of processor 701 can be found in the above method embodiments, and its implementation principle and technical effect are similar. It will not be repeated here.

[0135] In the above embodiments, it should be understood that the processor can be a Central Processing Unit (CPU), or other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), etc. The general-purpose processor can be a microprocessor or any conventional processor. The steps of the method disclosed in this invention can be directly implemented by a hardware processor, or implemented by a combination of hardware and software modules within the processor.

[0136] The memory may include random access memory (RAM) and may also include non-volatile memory (NVM), such as at least one disk storage device.

[0137] The bus can be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus, or an Extended Industry Standard Architecture (EISA) bus, etc. Buses can be categorized as address buses, data buses, control buses, etc. For ease of illustration, the buses shown in the accompanying drawings are not limited to a single bus or a single type of bus.

[0138] This application also provides a computer program product, including a computer program that, when executed by a processor, implements the above-described method.

[0139] This application also provides a computer-readable storage medium storing computer-executable instructions, which, when executed by a processor, implement the above-described method.

[0140] The aforementioned readable storage medium can be implemented by any type of volatile or non-volatile storage device or a combination thereof, such as static random access memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic storage, flash memory, magnetic disk, or optical disk. The readable storage medium can be any available medium accessible to a general-purpose or special-purpose computer.

[0141] An exemplary readable storage medium is coupled to a processor, enabling the processor to read information from and write information to the readable storage medium. Of course, the readable storage medium can also be a component of the processor. The processor and the readable storage medium can reside in an Application Specific Integrated Circuit (ASIC). Alternatively, the processor and the readable storage medium can exist as discrete components in the device.

[0142] The division of units is merely a logical functional division; in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be indirect coupling or communication connection through some interfaces, devices, or units, and may be electrical, mechanical, or other forms.

[0143] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0144] In addition, the functional units in the various embodiments of the present invention can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit.

[0145] If a function is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this invention, or the part that contributes to the prior art, or a part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods of the various embodiments of this invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0146] Those skilled in the art will understand that all or part of the steps of the above-described method embodiments can be implemented by hardware related to program instructions. The aforementioned program can be stored in a computer-readable storage medium. When executed, the program performs the steps of the above-described method embodiments; and the aforementioned storage medium includes various media capable of storing program code, such as ROM, RAM, magnetic disks, or optical disks.

[0147] Finally, it should be noted that other embodiments of the invention will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This invention is intended to cover any variations, uses, or adaptations of the invention that follow the general principles of the invention and include common knowledge or customary techniques in the art not disclosed herein, and is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of the invention is limited only by the appended claims.

Claims

1. A test method for a three-phase surge arrester, characterized in that, include: Obtain the reference voltage and total current of each phase of the three-phase surge arrester; The impedance angle of each phase of the three-phase surge arrester is determined based on the reference voltage and the total current. In response to the determination that there is a charged body around the three-phase surge arrester, a phase interference model is constructed. The phase interference model characterizes the interference of multiple interference sources on the impedance angle. The multiple interference sources include the current of the charged body and the current of the target phase in the three-phase surge arrester. The target phase is one of the three phases that is located between the other two phases. Based on the phase interference model, the impedance angle of each phase is corrected through step-by-step compensation, and the insulation performance of the three-phase surge arrester is determined according to the quantitative relationship between the corrected impedance angle and the preset impedance threshold.

2. The method according to claim 1, characterized in that, The step-by-step compensation method for correcting the impedance angle of each phase based on the phase interference model includes: Determine the compensation amount corresponding to the target interference source in the phase interference model, and make an initial correction to the impedance angle affected by the target interference source, wherein the target interference source is the current of the charged body or the current of the target phase; After the initial correction, the compensation amounts corresponding to the other interference sources in the phase interference model are determined, and the impedance angle affected by the other interference sources is corrected.

3. The method according to claim 2, characterized in that, After correcting the impedance angle of each phase through step-by-step compensation, the following is also included: The corrected impedance angles of each phase when the current of the charged body is the target interference source and the current of the target phase is the other interference source are denoted as the first type of impedance angles; When the current of the target phase is the target interference source and the current of the charged body is the other interference source, the corrected impedance angles of each phase are denoted as the second type of impedance angles. For any one of the three phases, the weighted average of the first type of impedance angle and the second type of impedance angle is calculated as the corrected impedance angle.

4. The method according to claim 1, characterized in that, The charged body is phase A busbar, the target phase is phase B, and the impedance angle of each phase is corrected through step-by-step compensation based on the phase interference model, including: The first compensation amount is calculated based on the impedance angles of phase B and phase C. The impedance angle of phase B is corrected according to the first compensation amount to obtain the corrected impedance angle of phase B, and the impedance angle of phase C is corrected according to the first compensation amount to obtain the corrected intermediate value of phase C. The second compensation amount is calculated based on the impedance angle of phase A and the intermediate value of phase C after correction; The impedance angles of phase A and phase C are corrected according to the second compensation amount to obtain the corrected impedance angles of phase A and phase C.

5. The method according to claim 1, characterized in that, The charged body is phase A busbar, the target phase is phase B, and the impedance angle of each phase is corrected through step-by-step compensation based on the phase interference model, including: The third compensation amount is calculated based on the impedance angles of phase A and phase C. The impedance angle of phase A is corrected according to the third compensation amount to obtain the corrected impedance angle of phase A, and the impedance angle of phase C is corrected according to the third compensation amount to obtain the intermediate value of phase C correction. The fourth compensation amount is calculated based on the impedance angle of phase B and the intermediate value of phase C after correction. The impedance angles of phase B and phase C are corrected according to the fourth compensation amount to obtain the corrected impedance angles of phase B and phase C.

6. The method according to any one of claims 1 to 5, characterized in that, The step-by-step compensation for correcting the impedance angle of each phase includes: Calculate the difference between the impedance angles of any two phases. If the absolute value of the difference between the impedance angle of one phase and the impedance angle of the other phase is greater than the preset target threshold, then keep the impedance angle of this phase unchanged and correct the impedance angles of the other two phases.

7. A three-phase surge arrester testing device, characterized in that, include: The acquisition module is used to acquire the reference voltage and total current of each phase of the three-phase surge arrester; Impedance angle calculation module, used to determine the impedance angle of each phase of the three-phase surge arrester based on the reference voltage and the total current; The model building module is used to build a phase interference model in response to determining that there is a charged body around the three-phase surge arrester. The phase interference model characterizes the interference of multiple interference sources on the impedance angle. The multiple interference sources include the current of the charged body and the current of the target phase in the three-phase surge arrester. The target phase is one of the three phases that is located between the other two phases. The correction module is used to correct the impedance angle of each phase through step-by-step compensation based on the phase interference model, and to determine the insulation performance of the three-phase surge arrester according to the quantitative relationship between the corrected impedance angle and the preset impedance threshold.

8. An electronic device, characterized in that, include: A processor, and a memory communicatively connected to the processor; The memory stores computer-executed instructions; The processor executes computer execution instructions stored in the memory to implement the method as described in any one of claims 1 to 6.

9. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer-executable instructions, which, when executed by a processor, are used to implement the method as described in any one of claims 1 to 6.

10. A computer program product, comprising a computer program, characterized in that, When the computer program is executed, it implements the method as described in any one of claims 1 to 6.

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