Method and device for detecting a three-phase grading ring arrester

Abstract

The embodiment of the application discloses a detection method and device of a three-phase belt grading ring lightning arrester. The detection method of the three-phase belt grading ring lightning arrester comprises the following steps: obtaining detection data of the three-phase belt grading ring lightning arrester; determining leakage current characteristic parameters of the three-phase belt grading ring lightning arrester according to a phase diagram of the three-phase belt grading ring lightning arrester, leakage current characteristics of the three-phase belt grading ring lightning arrester and the detection data; and determining an insulation state of the three-phase belt grading ring lightning arrester according to the leakage current characteristic parameters of the three-phase belt grading ring lightning arrester. The scheme can accurately obtain the leakage current characteristic parameters of the three-phase belt grading ring lightning arrester, and then accurately determine the insulation state of the three-phase lightning arrester.

Description

TECHNICAL FIELD

[0001] The embodiment of the present application relates to the technical field of power grid, in particular to a detection method and device of three-phase belt grading ring arrester. BACKGROUND

[0002] At present, the three-phase belt grading ring arrester of the transformer substation mainly adopts the method of testing leakage current under electrification, measures the leakage current and resistive component of the three-phase belt grading ring arrester in the operation process, so as to monitor the insulation state. However, due to the complex electric field environment of the open transformer substation, the three-phase belt grading ring arrester will be disturbed by the electric field, so that the grading ring of each phase grading ring arrester and the flange and base of the adjacent phase will produce coupling capacitance, thereby interfering with the detection result of the leakage current of the three-phase belt grading ring arrester, resulting in inaccurate detection data, and further unable to accurately determine the insulation state of the three-phase belt grading ring arrester. SUMMARY

[0003] The embodiment of the present application provides a detection method and device of three-phase belt grading ring arrester, so as to accurately obtain the leakage current characteristic parameters of the three-phase belt grading ring arrester, and further accurately determine the insulation state of the three-phase arrester.

[0004] In a first aspect, the embodiment of the present application provides a detection method of three-phase belt grading ring arrester, which comprises:

[0005] Obtaining detection data of the three-phase belt grading ring arrester;

[0006] According to the phase diagram of the three-phase belt grading ring arrester, the leakage current characteristics of the three-phase belt grading ring arrester and the detection data, the leakage current characteristic parameters of the three-phase belt grading ring arrester are determined;

[0007] According to the leakage current characteristic parameters of the three-phase belt grading ring arrester, the insulation state of the three-phase belt grading ring arrester is determined.

[0008] Optionally, the three-phase belt grading ring arrester comprises an A-phase belt grading ring arrester, a B-phase belt grading ring arrester and a C-phase belt grading ring arrester;

[0009] The phase diagram comprises an A-phase belt grading ring arrester leakage current phase diagram, a B-phase belt grading ring arrester leakage current phase diagram and a C-phase belt grading ring arrester leakage current phase diagram;

[0010] The A-phase belt grading ring arrester leakage current phase diagram is a phase diagram between the detected leakage current, the target leakage current and the interference current of the A-phase belt grading ring arrester;

[0011] The B-phase belt grading ring surge arrester leakage current phase diagram is a phase diagram among a detected leakage current, a target leakage current and an interference current of the B-phase belt grading ring surge arrester.

[0012] The C-phase belt grading ring surge arrester leakage current phase diagram is a phase diagram among a detected leakage current, a target leakage current and an interference current of the C-phase belt grading ring surge arrester.

[0013] Optionally, the detection data comprises A-phase belt grading ring surge arrester detection data, B-phase belt grading ring surge arrester detection data and C-phase belt grading ring surge arrester detection data.

[0014] The step of determining the leakage current characteristic parameter of the three-phase belt grading ring surge arrester comprises:

[0015] According to the A-phase belt grading ring surge arrester leakage current phase diagram and the A-phase belt grading ring surge arrester detection data, a first leakage current capacitive component increase-decrease model and a first leakage current resistive component increase-decrease amount model are determined.

[0016] According to the B-phase belt grading ring surge arrester leakage current phase diagram and the B-phase belt grading ring surge arrester detection data, a second leakage current capacitive component increase-decrease model and a second leakage current resistive component increase-decrease amount model are determined.

[0017] According to the C-phase belt grading ring surge arrester leakage current phase diagram and the C-phase belt grading ring surge arrester detection data, a third leakage current capacitive component increase-decrease model and a third leakage current resistive component increase-decrease amount model are determined.

[0018] According to the leakage current characteristic, a leakage current capacitive component equivalent model is determined.

[0019] According to the first leakage current capacitive component increase-decrease model, the first leakage current resistive component increase-decrease amount model, the second leakage current capacitive component increase-decrease model, the second leakage current resistive component increase-decrease amount model, the third leakage current capacitive component increase-decrease model, the third leakage current resistive component increase-decrease amount model and the leakage current capacitive component equivalent model, the leakage current characteristic parameter of the three-phase belt grading ring surge arrester is obtained.

[0020] Optionally, the A-phase belt grading ring surge arrester detection data comprises an A-phase detected leakage current value and an A-phase detected angle of leading an A-phase bus voltage by the A-phase detected leakage current.

[0021] The first leakage current capacitive component increase-decrease model is:

[0022]

[0023] The first leakage current resistive component increase-decrease amount model is:

[0024]

[0025] wherein, I a1 is the A-phase detected leakage current value, is the A-phase detected angle, I A1 is the target leakage current value of the A-phase grading ring arrester, is the A-phase target interference angle of the target leakage current of the A-phase grading ring arrester leading the A-phase bus voltage, I x1 is the interference current value of the A-phase grading ring arrester.

[0026] Optionally, the C-phase grading ring arrester detection data includes a C-phase detected leakage current value and a C-phase detected leakage current value leading a C-phase bus voltage by a C-phase detected angle;

[0027] The third leakage current capacitive component increase / decrease model is:

[0028]

[0029] The third leakage current resistive component increase / decrease model is:

[0030]

[0031] wherein, I c1 is the C-phase detected leakage current value, is the C-phase detected angle, I C1 is the target leakage current value of the C-phase grading ring arrester, is the C-phase target interference angle of the target leakage current of the C-phase grading ring arrester leading the C-phase bus voltage, I x2 is the interference current value of the C-phase grading ring arrester.

[0032] Optionally, the B-phase grading ring arrester detection data includes a B-phase detected leakage current value and a B-phase detected leakage current value leading a B-phase bus voltage by a B-phase detected angle;

[0033] The second leakage current capacitive component increase / decrease model is:

[0034]

[0035] The second leakage current resistive component increase / decrease model is:

[0036]

[0037] wherein, I b1 is the B-phase detected leakage current value, is a target leakage current value of the B-phase belt grading ring arrester, B1 is a target leakage current value of the B-phase belt grading ring arrester, is a target interference angle of the target leakage current of the B-phase belt grading ring arrester leading the B-phase bus voltage, x3 and I x4 are interference current values of the B-phase belt grading ring arrester;

[0038] is an interference current value of the A-phase belt grading ring arrester, x1 is an interference current value of the C-phase belt grading ring arrester, x2 and is an interference current value of the B-phase belt grading ring arrester, x3 and I x4 are equal.

[0039] Optionally, the leakage current capacitive component equivalent model comprises an A-phase and B-phase leakage current capacitive component equivalent model and an A-phase and C-phase leakage current capacitive component equivalent model.

[0040] The A-phase and B-phase leakage current capacitive component equivalent model is:

[0041]

[0042] The A-phase and C-phase leakage current capacitive component equivalent model is:

[0043]

[0044] wherein I A1 is a target leakage current value of the A-phase belt grading ring arrester, is an A-phase target interference angle of the target leakage current of the A-phase belt grading ring arrester leading the A-phase bus voltage, C1 is a target leakage current value of the C-phase belt grading ring arrester, is a C-phase target interference angle of the target leakage current of the C-phase belt grading ring arrester leading the C-phase bus voltage, B1 is a target leakage current value of the B-phase belt grading ring arrester, is a B-phase target angle of the target leakage current of the B-phase belt grading ring arrester leading the B-phase bus voltage.

[0045] Optionally, the leakage current characteristic parameters comprise an A-phase leakage current resistance component of the A-phase grading ring arrester, a B-phase leakage current resistance component of the B-phase grading ring arrester, a C-phase leakage current resistance component of the C-phase grading ring arrester, an A-phase target interference angle of the A-phase leakage current leading an A-phase bus voltage of the A-phase grading ring arrester, a B-phase target interference angle of the B-phase leakage current leading a B-phase bus voltage of the B-phase grading ring arrester, and a C-phase target interference angle of the C-phase leakage current leading a C-phase bus voltage of the C-phase grading ring arrester.

[0046] Optionally, the A-phase leakage current resistance component I AR is:

[0047]

[0048] the B-phase leakage current resistance component I BR is:

[0049]

[0050] the C-phase leakage current resistance component is:

[0051]

[0052] the A-phase target interference angle is:

[0053]

[0054] the B-phase target interference angle is:

[0055]

[0056] the C-phase target interference angle is:

[0057]

[0058] wherein I a1 is the A-phase detected leakage current value, is the A-phase detected angle, I c1 is the C-phase detected leakage current value, is the C-phase detected angle, I b1 is the B-phase detected leakage current value, is the B-phase detected angle.

[0059] In a second aspect, an embodiment of the present application further provides a detection device of a three-phase grading ring arrester, the detection device comprising:

[0060] An acquisition module is configured to acquire detection data of the three-phase grading ring surge arrester.

[0061] A leakage current characteristic parameter determination module is configured to determine a leakage current characteristic parameter of the three-phase grading ring surge arrester according to a phase diagram of the three-phase grading ring surge arrester, a leakage current characteristic of the three-phase grading ring surge arrester, and the detection data.

[0062] A state determination module is configured to determine an insulation state of the three-phase grading ring surge arrester according to the leakage current characteristic parameter of the three-phase grading ring surge arrester. According to the method, the leakage current characteristic parameter of the three-phase grading ring surge arrester can be accurately obtained, and the insulation state of the three-phase grading ring surge arrester can be accurately determined. BRIEF DESCRIPTION OF DRAWINGS

[0063] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiments will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative effort.

[0064] Figure 1 A three-phase grading ring surge arrester interphase coupling schematic diagram provided for the prior art;

[0065] Figure 2 A flowchart of a three-phase grading ring surge arrester detection method provided for the embodiments of the present application;

[0066] Figure 3 A phase diagram of a B-phase grading ring surge arrester leakage current provided for the embodiments of the present application;

[0067] Figure 4 A phase diagram of a C-phase grading ring surge arrester leakage current provided for the embodiments of the present application;

[0068] Figure 5 A phase diagram of a B-phase grading ring surge arrester leakage current provided for the embodiments of the present application;

[0069] Figure 6 A flowchart of a step of determining a leakage current characteristic parameter of a three-phase grading ring surge arrester provided for the embodiments of the present application;

[0070] Figure 7 A structural schematic diagram of a detection device of a three-phase belt grading ring lightning arrester provided by the embodiment of the present application is shown. DETAILED DESCRIPTION

[0071] In order for those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor should fall within the scope of protection of the present application.

[0072] It should be noted that the terms "first", "second", and the like in the specification and claims of the present application and the above-described drawings are used to distinguish similar objects, and do not necessarily have to be used to describe a specific order or sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product, or device including a series of steps or units does not have to be limited to only those steps or units clearly listed, but can include other steps or units not clearly listed or inherent to these processes, methods, products, or devices.

[0073] Figure 1 A three-phase belt grading ring lightning arrester interphase coupling schematic diagram provided by the prior art is shown in Figure 1 As shown, the left belt grading ring lightning arrester is an A-phase belt grading ring lightning arrester, the middle belt grading ring lightning arrester is a B-phase belt grading ring lightning arrester, and the right belt grading ring lightning arrester is a C-phase belt grading ring lightning arrester. The base of the A-phase belt grading ring lightning arrester will be coupled and interfered by the grading ring of the B-phase belt grading ring lightning arrester, the base of the C-phase belt grading ring lightning arrester will be coupled and interfered by the grading ring of the B-phase belt grading ring lightning arrester, and the base of the B-phase belt grading ring lightning arrester will be coupled and interfered by the grading rings of the A-phase belt grading ring lightning arrester and the C-phase belt grading ring lightning arrester. Thus, the leakage current of the three-phase belt grading ring lightning arrester detected is inaccurate, and the insulation state of the three-phase belt grading ring lightning arrester cannot be accurately judged.

[0074] In view of the above problems, the embodiment of the present application provides a detection method of a three-phase belt grading ring lightning arrester, Figure 2A flowchart of a detection method of a three-phase belt grading ring lightning arrester provided by the embodiment of the present application is shown. The embodiment can be applied to the case where the three-phase belt grading ring lightning arrester needs to be detected, and the method can be executed by the detection device of the three-phase belt grading ring lightning arrester. As shown in the figure, the method specifically includes the following steps: Figure 1

[0075] S110, detection data of the three-phase belt grading ring lightning arrester is obtained.

[0076] The detection data of the three-phase belt grading ring lightning arrester is the leakage current of each phase belt grading ring lightning arrester and the angle of the leakage current of each phase belt grading ring lightning arrester leading the corresponding phase bus voltage obtained by the live test of the three-phase belt grading ring lightning arrester.

[0077] Specifically, the three-phase belt grading ring lightning arrester includes an A-phase belt grading ring lightning arrester, a B-phase belt grading ring lightning arrester, and a C-phase belt grading ring lightning arrester, so that the detection data includes A-phase belt grading ring lightning arrester detection data, B-phase belt grading ring lightning arrester detection data, and C-phase belt grading ring lightning arrester detection data; wherein the A-phase belt grading ring lightning arrester detection data includes an A-phase detection leakage current value and an A-phase detection angle of the A-phase detection leakage current leading the A-phase bus voltage; the C-phase belt grading ring lightning arrester detection data includes a C-phase detection leakage current value and a C-phase detection angle of the C-phase detection leakage current leading the C-phase bus voltage; and the B-phase belt grading ring lightning arrester detection data includes a B-phase detection leakage current value and a B-phase detection angle of the B-phase detection leakage current leading the B-phase bus voltage.

[0078] The A-phase detection leakage current is the detection leakage current of the A-phase belt grading ring lightning arrester, and the A-phase detection leakage current value is the scalar value of the detection leakage current of the A-phase belt grading ring lightning arrester; the B-phase detection leakage current is the detection leakage current of the B-phase belt grading ring lightning arrester, and the B-phase detection leakage current value is the scalar value of the detection leakage current of the B-phase belt grading ring lightning arrester; and the C-phase detection leakage current is the detection leakage current of the C-phase belt grading ring lightning arrester, and the C-phase detection leakage current value is the scalar value of the detection leakage current of the C-phase belt grading ring lightning arrester.

[0079] S120, according to the phase diagram of the three-phase belt grading ring lightning arrester, the leakage current characteristics of the three-phase belt grading ring lightning arrester, and the detection data, the leakage current characteristic parameters of the three-phase belt grading ring lightning arrester are determined.

[0080] ​The phase diagram of the three-phase belt grading ring lightning arrester refers to a phase relationship diagram among the detection leakage current, the target leakage current and the interference current of the three-phase belt grading ring lightning arrester. The phase diagram includes an A-phase belt grading ring lightning arrester leakage current phase diagram, a B-phase belt grading ring lightning arrester leakage current phase diagram and a C-phase belt grading ring lightning arrester leakage current phase diagram; the A-phase belt grading ring lightning arrester leakage current phase diagram is a phase relationship diagram among the detection leakage current, the target leakage current and the interference current of the A-phase belt grading ring lightning arrester; the B-phase belt grading ring lightning arrester leakage current phase diagram is a phase relationship diagram among the detection leakage current, the target leakage current and the interference current of the B-phase belt grading ring lightning arrester; and the C-phase belt grading ring lightning arrester leakage current phase diagram is a phase relationship diagram among the detection leakage current, the target leakage current and the interference current of the C-phase belt grading ring lightning arrester.

[0081] The detection leakage current of the A-phase belt grading ring lightning arrester is a leakage current detected by the A-phase belt grading ring lightning arrester through a live test, the detection leakage current of the B-phase belt grading ring lightning arrester is a leakage current detected by the B-phase belt grading ring lightning arrester through a live test, and the detection leakage current of the C-phase belt grading ring lightning arrester is a leakage current detected by the C-phase belt grading ring lightning arrester through a live test; the target leakage current of the A-phase belt grading ring lightning arrester is an actual leakage current of the A-phase belt grading ring lightning arrester, the target leakage current of the B-phase belt grading ring lightning arrester is an actual leakage current of the B-phase belt grading ring lightning arrester, and the target leakage current of the C-phase belt grading ring lightning arrester is an actual leakage current of the C-phase belt grading ring lightning arrester; the interference current of the A-phase belt grading ring lightning arrester refers to a current generated by the coupling interference of the grading ring of the B-phase belt grading ring lightning arrester on the base of the A-phase belt grading ring lightning arrester, the interference current of the C-phase belt grading ring lightning arrester refers to a current generated by the coupling interference of the grading ring of the B-phase belt grading ring lightning arrester on the base of the C-phase belt grading ring lightning arrester, and the interference current of the B-phase belt grading ring lightning arrester refers to a current generated by the coupling interference of the grading rings of the A-phase belt grading ring lightning arrester and the C-phase belt grading ring lightning arrester on the base of the B-phase belt grading ring lightning arrester.

[0082] Exemplarily, Figure 3 a B-phase belt grading ring lightning arrester leakage current phase diagram, Figure 3 in which the relationship among the detection leakage current, the target leakage current and the interference current of the A-phase belt grading ring lightning arrester is marked out, i.e. the target leakage current and the interference current the detection leakage current of the A-phase belt grading ring lightning arrester the target leakage current and the interference current and the A-phase bus voltage U A , the B-phase bus voltage U B ​and the C-phase bus voltage U C , for example, the interference current is perpendicular to the B-phase bus voltage U B , the target leakage current leads the A-phase bus voltage U A , the A-phase target interference angle , and so on.

[0083] Figure 4 A C-phase grading ring arrester leakage current phase diagram provided by the embodiment of the present application labels the detection leakage current of the C-phase grading ring arrester the target leakage current and the interference current , that is the detection leakage current of the C-phase grading ring arrester the target leakage current and the interference current and the position relationship between the A-phase bus voltage U A , the B-phase bus voltage U B and the C-phase bus voltage U C , for example, the interference current is perpendicular to the B-phase bus voltage U B , the target leakage current leads the C-phase bus voltage U C , the C-phase target interference angle , and so on.

[0084] Figure 5 A B-phase grading ring arrester leakage current phase diagram provided by the embodiment of the present application labels the detection leakage current of the B-phase grading ring arrester the target leakage current the interference current and the interference current , that is the detection leakage current of the B-phase grading ring arrester the target leakage current the interference current and the interference current and the position relationship between the A-phase bus voltage U A , the B-phase bus voltage U B and the C-phase bus voltage U C , for example, the interference current is perpendicular to the C-phase bus voltage U C , the interference current is perpendicular to the A-phase bus voltage U A , the target leakage current leads the B-phase bus voltage UB the B-phase target interference angle etc.

[0085] In addition, the interference current of the A-phase grading ring arrester the interference current of the C-phase grading ring arrester the interference current of the B-phase grading ring arrester the interference current of the B-phase grading ring arrester the modules of the interference currents of the A-phase, B-phase and C-phase grading ring arresters are equal (the scalar values are equal).

[0086] Thus, according to the phase diagram of the three-phase grading ring arresters, the vector sum of the target leakage current and the interference current of each phase grading ring arrester is equal to the detected leakage current, so that it can be confirmed that the target leakage current, the interference current and the detected leakage current of each phase grading ring arrester are all in the vertical direction leakage current capacitive component relationship corresponding to the phase bus voltage, and that the target leakage current, the interference current and the detected leakage current of each phase grading ring arrester are all in the leakage current resistive component relationship corresponding to the phase bus voltage direction. By bringing the known quantity detection data into the leakage current capacitive component relationship, the leakage current capacitive component increase / decrease model of each phase grading ring arrester can be obtained. By bringing the known quantity detection data into the leakage current resistive component relationship, the leakage current resistive component increase / decrease model of each phase grading ring arrester can be obtained.

[0087] Since the models and structures of each phase grading ring arrester are the same, according to the leakage current characteristics, the leakage current capacitive components of each phase grading ring arrester are equal, so that the leakage current capacitive component equal model can be obtained.

[0088] In addition, the leakage current characteristic parameters include the A-phase leakage current resistive component of the A-phase grading ring arrester, the B-phase leakage current resistive component of the B-phase grading ring arrester, the C-phase leakage current resistive component of the C-phase grading ring arrester, the A-phase target interference angle of the target leakage current of the A-phase grading ring arrester leading the A-phase bus voltage, the B-phase target interference angle of the leakage current of the B-phase grading ring arrester leading the B-phase bus voltage, and the C-phase target interference angle of the leakage current of the C-phase grading ring arrester leading the C-phase bus voltage. Among them, the A-phase leakage current resistive component is the component of the target leakage current of the A-phase grading ring arrester in the direction of the A-phase bus voltage, the B-phase leakage current resistive component is the component of the target leakage current of the B-phase grading ring arrester in the direction of the B-phase bus voltage, and the C-phase leakage current resistive component is the component of the target leakage current of the C-phase grading ring arrester in the direction of the C-phase bus voltage.

[0089] The leakage current characteristic parameters of the three-phase grading ring arrester can be obtained by combining and solving the leakage current capacitive component increment-decrement model, the leakage current resistive component increment-decrement model and the leakage current capacitive component equivalent model of each phase grading ring arrester.

[0090] S130, determining the insulation state of the three-phase grading ring arrester according to the leakage current characteristic parameters of the three-phase grading ring arrester.

[0091] The leakage current resistive component is generated by the conduction of the three-phase arrester and can reflect the insulation performance of the arrester, so that the insulation state of the three-phase arrester can be determined according to the leakage current characteristic parameters.

[0092] The embodiment of the present application obtains the detection data of the three-phase grading ring arrester, determines the leakage current characteristic parameters of the three-phase grading ring arrester according to the phase diagram of the three-phase grading ring arrester, the leakage current characteristic of the three-phase grading ring arrester and the detection data, and determines the insulation state of the three-phase grading ring arrester according to the leakage current characteristic parameters of the three-phase grading ring arrester. Therefore, the leakage current characteristic parameters of the three-phase grading ring arrester can be accurately obtained by the above method, and the insulation state of the three-phase arrester can be accurately determined.

[0093] On the basis of the above embodiment, the detection data can include A-phase grading ring arrester detection data, B-phase grading ring arrester detection data and C-phase grading ring arrester detection data.

[0094] The A-phase grading ring arrester detection data is the leakage current data obtained by conducting a live test on the A-phase grading ring arrester, the B-phase grading ring arrester detection data is the leakage current data obtained by conducting a live test on the B-phase grading ring arrester, and the C-phase grading ring arrester detection data is the leakage current data obtained by conducting a live test on the C-phase grading ring arrester.

[0095] Figure 6 A flowchart of the steps of determining the leakage current characteristic parameters of the three-phase grading ring arrester is provided in the embodiment of the present application, as shown in Figure 6 The steps of determining the leakage current characteristic parameters of the three-phase grading ring arrester are described as follows:

[0096] S210, determining the first leakage current capacitive component increment-decrement model and the first leakage current resistive component increment-decrement model according to the A-phase grading ring arrester leakage current phase diagram and the A-phase grading ring arrester detection data.

[0097] Among them, the first leakage current capacitive component increase / decrease model is a model that can reflect the increase / decrease of the leakage current capacitive component of the A-phase lightning arrester with a grading ring, and the first leakage current capacitive component increase / decrease model is a model that can reflect the increase / decrease of the leakage current resistive component of the A-phase lightning arrester with a grading ring.

[0098] Specifically, refer to Figure 3 It can be seen that Interference current With the B-phase bus voltage U B Vertical, A-phase bus voltage U A With the B-phase bus voltage U B The angle is 120° and other position information, so we can know the interference current of the A phase arrester with grading ring Leading A phase voltage U A The angle is 30°, the target leakage current The bus voltage U in phase A A Vertical component and detection leakage current The bus voltage U in phase A A The difference in the vertical components is equal to the interference current The bus voltage U in phase A A The vertical component can reflect the increase or decrease of the capacitance component of the leakage current of the A-phase arrester with grading ring; detect the leakage current The bus voltage U in phase A A The component and target leakage current The bus voltage U in phase A A The difference of the components is equal to the interference current The bus voltage U in phase A A The component of the leakage current can reflect the increase or decrease of the resistive component of the A-phase arrester with a grading ring.

[0099] Therefore, the first leakage current capacitive component increase / decrease model can be determined according to the increase / decrease of the leakage current capacitive component of the A-phase arrester with a grading ring; the first leakage current resistive component increase / decrease model can be determined according to the increase / decrease of the leakage current resistive component of the A-phase arrester with a grading ring.

[0100] S220 , determining a second leakage current capacitive component increase / decrease model and a second leakage current resistive component increase / decrease model based on a B-phase arrester with a grading ring leakage current phase diagram and detection data of the B-phase arrester with a grading ring.

[0101] Specifically, refer to Figure 5 It can be seen that Interference current and C-phase bus voltage U C Vertical, interference current With the A phase bus voltage U A Vertical, A-phase bus voltage U A With the B-phase bus voltage U B The angle is 120°, the C phase bus voltage U C With the B-phase bus voltage U B The angle is 120° and other position information, so we can know the interference current of the B phase arrester with grading ring and interference current Both lead the B phase voltage U B The angle is 30°, the target leakage current The B-phase bus voltage U B Vertical component and detection leakage current The B-phase bus voltage U B The difference in the vertical components is equal to the interference current and interference current The B-phase bus voltage U B The vertical component can reflect the increase or decrease of the capacitance component of the leakage current of the B-phase arrester with grading ring; detect the leakage current The B-phase bus voltage U B The component and target leakage current The B-phase bus voltage U B The difference of the components is equal to the interference current and interference current The B-phase bus voltage U B The component of the leakage current can reflect the increase or decrease of the resistive component of the B-phase arrester with grading ring.

[0102] Therefore, the second leakage current capacitive component increase / decrease model can be determined according to the increase / decrease of the leakage current capacitive component of the B-phase arrester with a grading ring; the second leakage current resistive component increase / decrease model can be determined according to the increase / decrease of the leakage current resistive component of the B-phase arrester with a grading ring.

[0103] S230 , determining a third leakage current capacitive component increase / decrease model and a third leakage current resistive component increase / decrease model based on a C-phase arrester with a grading ring leakage current phase diagram and detection data of the C-phase arrester with a grading ring.

[0104] Specifically, refer to Figure 4 It can be seen that Interference current With the B-phase bus voltage U B Vertical, C-phase bus voltage U C With the B-phase bus voltage U B The angle is 120° and other position information, so we can know the interference current of the C phase arrester with grading ring Leading C phase voltage UC the angle of 30°, the leakage current the C-phase bus voltage U C the component in the vertical direction and the target leakage current the C-phase bus voltage U C the difference between the components in the vertical direction is equal to the interference current the C-phase bus voltage U C the component in the vertical direction, so as to reflect the increase or decrease of the capacitive component of the leakage current of the C-phase grading ring arrester; the target leakage current the C-phase bus voltage U C the component of the detected leakage current the C-phase bus voltage U C the difference between the components is equal to the interference current the C-phase bus voltage U C the component, so as to reflect the increase or decrease of the resistive component of the leakage current of the C-phase grading ring arrester.

[0105] Therefore, the third leakage current capacitive component increase or decrease model can be determined according to the increase or decrease of the capacitive component of the leakage current of the C-phase grading ring arrester; and the third leakage current resistive component increase or decrease model can be determined according to the increase or decrease of the resistive component of the leakage current of the C-phase grading ring arrester.

[0106] S240, determining a leakage current capacitive component equivalent model according to the leakage current characteristics.

[0107] Since the model and structure of each phase grading ring arrester are the same, and the leakage current capacitive component of each phase grading ring arrester is equivalent according to the leakage current characteristics, the leakage current capacitive component equivalent model is obtained.

[0108] S250, obtaining the leakage current characteristic parameters of the three-phase grading ring arrester according to the first leakage current capacitive component increase or decrease model, the first leakage current resistive component increase or decrease model, the second leakage current capacitive component increase or decrease model, the second leakage current resistive component increase or decrease model, the third leakage current capacitive component increase or decrease model, the third leakage current resistive component increase or decrease model, and the leakage current capacitive component equivalent model.

[0109] Specifically, the first leakage current capacitive component increase or decrease model, the first leakage current resistive component increase or decrease model, the second leakage current capacitive component increase or decrease model, the second leakage current resistive component increase or decrease model, the third leakage current capacitive component increase or decrease model, the third leakage current resistive component increase or decrease model, and the leakage current capacitive component equivalent model are combined and solved, and the leakage current characteristic parameters can be obtained.

[0110] In addition, it should be noted that the interference current of the A-phase grading ring arrester Interference current value of phase C grading ring arrester Interference current value, interference current of B phase surge arrester with grading ring The interference current value and the interference current of the B phase surge arrester with grading ring The interference current values ​​are equal.

[0111] Based on the above embodiment, optionally, the detection data of the A-phase lightning arrester with a grading ring includes the A-phase detection leakage current value and the A-phase detection angle at which the A-phase detection leakage current leads the A-phase bus voltage;

[0112] The increase and decrease model of the capacitive component of the first leakage current is:

[0113]

[0114] The increase and decrease model of the resistive component of the first leakage current is:

[0115]

[0116] Among them, I a1 is the leakage current value detected for phase A, is the detection angle of phase A, I A1 is the target leakage current value of the A-phase arrester with a grading ring (the scalar value of the target leakage current of the A-phase arrester with a grading ring), The target interference angle of phase A, where the target leakage current of the phase A arrester with a grading ring leads the bus voltage of phase A, is I x1 is the interference current value of the A-phase arrester with a grading ring (the scalar value of the interference current of the A-phase arrester with a grading ring).

[0117] Based on the above embodiment, optionally, the detection data of the C-phase arrester with a grading ring includes a C-phase detection leakage current value and a C-phase detection angle at which the C-phase detection leakage current leads the C-phase bus voltage;

[0118] The increase and decrease model of the capacitive component of the third leakage current is:

[0119]

[0120] The increase and decrease model of the resistive component of the third leakage current is:

[0121]

[0122] Among them, I c1 is the leakage current value detected for phase C, is the C phase detection angle, I C1 is the target leakage current value of the C-phase arrester with a grading ring (the scalar value of the target leakage current of the C-phase arrester with a grading ring), The target leakage current value of the C-phase arrester with a grading ring leads the C-phase bus voltage. I x2 is the interference current value of the C-phase arrester with a grading ring (the scalar value of the interference current of the C-phase arrester with a grading ring).

[0123] Based on the above embodiment, optionally, the detection data of the B-phase lightning arrester with a grading ring includes a B-phase detection leakage current value and a B-phase detection angle at which the B-phase detection leakage current leads the B-phase bus voltage;

[0124] The increase and decrease model of the capacitive component of the second leakage current is:

[0125]

[0126] The increase and decrease model of the resistive component of the second leakage current is:

[0127]

[0128] Among them, I b1 is the leakage current value detected for phase B, is the detection angle of phase B, I B1 is the target leakage current value of the B-phase arrester with a grading ring (the scalar value of the target leakage current of the B-phase arrester with a grading ring), is the target interference angle of phase B that is caused by the target leakage current of the phase B arrester with grading ring leading the phase B bus voltage, I x3 and I x4 All are the interference current values ​​of the B-phase arrester with a grading ring (scalar values ​​of the interference current of the B-phase arrester with a grading ring).

[0129] In addition, the interference current value I of the A phase surge arrester with grading ring is x1 , the interference current value of the C phase arrester with grading ring I x2 And the interference current value I of the B phase surge arrester with grading ring x3 and I x4 All are equal.

[0130] Based on the above embodiment, optionally, the leakage current capacitive component equivalent model includes an A-phase and B-phase leakage current capacitive component equivalent model and an A-phase and C-phase leakage current capacitive component equivalent model;

[0131] The equivalent model of the capacitive component of the leakage current of phase A and phase B is:

[0132]

[0133] The equivalent model of the capacitive component of the leakage current of phase A and phase C is:

[0134]

[0135] wherein I A1 is a target leakage current value of the A-phase belt grading arrester, is an A-phase target interference angle of the target leakage current of the A-phase belt grading arrester leading the A-phase bus voltage, I C1 is a target leakage current value of the C-phase belt grading arrester, is a C-phase target interference angle of the target leakage current of the C-phase belt grading arrester leading the C-phase bus voltage, I B1 is a target leakage current value of the B-phase belt grading arrester, is a B-phase target interference angle of the target leakage current of the B-phase belt grading arrester leading the B-phase bus voltage.

[0136] On the basis of the above-mentioned embodiments, optionally, the leakage current characteristic parameters include an A-phase leakage current resistive component of the A-phase belt grading arrester, a B-phase leakage current resistive component of the B-phase belt grading arrester, a C-phase leakage current resistive component of the C-phase belt grading arrester, an A-phase target interference angle of the target leakage current of the A-phase belt grading arrester leading the A-phase bus voltage, a B-phase target interference angle of the target leakage current of the B-phase belt grading arrester leading the B-phase bus voltage, and a C-phase target interference angle of the target leakage current of the C-phase belt grading arrester leading the C-phase bus voltage.

[0137] Specifically, the A-phase leakage current resistive component I AR is:

[0138]

[0139] the B-phase leakage current resistive component I BR is:

[0140]

[0141] the C-phase leakage current resistive component is:

[0142]

[0143] the A-phase target interference angle is:

[0144]

[0145] the B-phase target interference angle is:

[0146]

[0147] the C-phase target interference angle is:

[0148]

[0149] wherein, I a1 is the A-phase detected leakage current value, is the A-phase detection angle, I c1 is the C-phase detected leakage current value, is the C-phase detection angle, I b1 is the B-phase detected leakage current value, is the B-phase detection angle.

[0150] Figure 7 A detection device of a three-phase belt grading ring surge arrester provided by an embodiment of the present application has the structural schematic diagram as shown in Figure 7 The detection device of the three-phase belt grading ring surge arrester comprises:

[0151] The acquisition module 710 is configured to acquire detection data of the three-phase belt grading ring surge arrester.

[0152] The leakage current characteristic parameter determination module 720 is configured to determine leakage current characteristic parameters of the three-phase belt grading ring surge arrester according to the phase diagram of the three-phase belt grading ring surge arrester, the leakage current characteristic of the three-phase belt grading ring surge arrester, and the detection data.

[0153] The state determination module 730 is configured to determine an insulation state of the three-phase belt grading ring surge arrester according to the leakage current characteristic parameters of the three-phase belt grading ring surge arrester.

[0154] The leakage current characteristic parameter determination module 720 determines leakage current characteristic parameters of the three-phase belt grading ring surge arrester according to the phase diagram of the three-phase belt grading ring surge arrester, the leakage current characteristic of the three-phase belt grading ring surge arrester, and the detection data. The state determination module 730 determines an insulation state of the three-phase belt grading ring surge arrester according to the leakage current characteristic parameters of the three-phase belt grading ring surge arrester. Thus, the present scheme can accurately obtain leakage current characteristic parameters of the three-phase belt grading ring surge arrester, and further accurately determine an insulation state of the three-phase surge arrester.

[0155] In the above embodiment, the detection data comprises A-phase belt grading ring surge arrester detection data, B-phase belt grading ring surge arrester detection data, and C-phase belt grading ring surge arrester detection data.

[0156] The leakage current characteristic parameter determination module comprises:

[0157] The first model determination unit is configured to determine a first leakage current capacitive component increment-decrement model and a first leakage current resistive component increment-decrement model according to the A-phase belt grading ring surge arrester leakage current phase diagram and the A-phase belt grading ring surge arrester detection data.

[0158] The second model determining unit is configured to determine a second leakage current capacitive component increment / decrement model and a second leakage current resistive component increment / decrement model according to the B-phase belt grading ring arrester leakage current phase diagram and the B-phase belt grading ring arrester detection data;

[0159] The third model determining unit is configured to determine a third leakage current capacitive component increment / decrement model and a third leakage current resistive component increment / decrement model according to the C-phase belt grading ring arrester leakage current phase diagram and the C-phase belt grading ring arrester detection data;

[0160] The fourth model determining unit is configured to determine a leakage current capacitive component equivalent model according to the leakage current characteristic.

[0161] The calculating unit is configured to obtain a leakage current characteristic parameter of the three-phase belt grading ring arrester according to the first leakage current capacitive component increment / decrement model, the first leakage current resistive component increment / decrement model, the second leakage current capacitive component increment / decrement model, the second leakage current resistive component increment / decrement model, the third leakage current capacitive component increment / decrement model, the third leakage current resistive component increment / decrement model, and the leakage current capacitive component equivalent model.

[0162] It should be understood that the various forms of flow shown above can be reordered, added to, or deleted from, steps. For example, each step described in the present application can be executed in parallel, sequentially, or in a different order, as long as the desired results of the technical solutions of the present application can be achieved, and the present application is not limited herein.

[0163] The above detailed description does not constitute a limitation on the protection scope of the present application. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent replacements, and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A detection method of a three-phase grading ring lightning arrester, characterized in that, The method comprises the following steps: acquiring detection data of the three-phase belt grading ring surge arrester; determining leakage current characteristic parameters of the three-phase belt grading ring surge arrester according to a phase diagram of the three-phase belt grading ring surge arrester, leakage current characteristics of the three-phase belt grading ring surge arrester and the detection data; determining an insulation state of the three-phase belt grading ring surge arrester according to the leakage current characteristic parameters of the three-phase belt grading ring surge arrester; the three-phase belt grading ring surge arrester comprises an A-phase belt grading ring surge arrester, a B-phase belt grading ring surge arrester and a C-phase belt grading ring surge arrester; the phase diagram comprises an A-phase belt grading ring surge arrester leakage current phase diagram, a B-phase belt grading ring surge arrester leakage current phase diagram and a C-phase belt grading ring surge arrester leakage current phase diagram; the A-phase belt grading ring surge arrester leakage current phase diagram is a phase diagram among a detected leakage current, a target leakage current and an interference current of the A-phase belt grading ring surge arrester; the B-phase belt grading ring surge arrester leakage current phase diagram is a phase diagram among a detected leakage current, a target leakage current and an interference current of the B-phase belt grading ring surge arrester; the C-phase belt grading ring surge arrester leakage current phase diagram is a phase diagram among a detected leakage current, a target leakage current and an interference current of the C-phase belt grading ring surge arrester; the detection data comprises A-phase belt grading ring surge arrester detection data, B-phase belt grading ring surge arrester detection data and C-phase belt grading ring surge arrester detection data; the step of determining the leakage current characteristic parameters of the three-phase belt grading ring surge arrester comprises: determining a first leakage current capacitive component increase-decrease model and a first leakage current resistive component increase-decrease amount model according to the A-phase belt grading ring surge arrester leakage current phase diagram and the A-phase belt grading ring surge arrester detection data; determining a second leakage current capacitive component increase-decrease model and a second leakage current resistive component increase-decrease amount model according to the B-phase belt grading ring surge arrester leakage current phase diagram and the B-phase belt grading ring surge arrester detection data; determining a third leakage current capacitive component increase-decrease model and a third leakage current resistive component increase-decrease amount model according to the C-phase belt grading ring surge arrester leakage current phase diagram and the C-phase belt grading ring surge arrester detection data; determining a leakage current capacitive component equivalent model according to the leakage current characteristics; obtaining the leakage current characteristic parameters of the three-phase belt grading ring surge arrester according to the first leakage current capacitive component increase-decrease model, the first leakage current resistive component increase-decrease amount model, the second leakage current capacitive component increase-decrease model, the second leakage current resistive component increase-decrease amount model, the third leakage current capacitive component increase-decrease model, the third leakage current resistive component increase-decrease amount model and the leakage current capacitive component equivalent model.

2. The detection method of the grading ring surge arrester according to claim 1, characterized in that, the A-phase belt grading ring surge arrester detection data comprises an A-phase detected leakage current value and an A-phase detected angle of leading an A-phase bus voltage by the A-phase detected leakage current; the first leakage current capacitive component increase-decrease model is: the first leakage current resistive component increase-decrease amount model is: wherein I a1 is the leakage current value detected by the A phase, is the angle detected by the A phase, A1 is the target leakage current value of the A phase grading ring arrester, is the A phase target interference angle of the target leakage current of the A phase grading ring arrester leading the A phase bus voltage, x1 is the interference current value of the A phase grading ring arrester.

3. The detection method of the grading ring surge arrester according to claim 2, characterized in that, The C-phase detection leakage current value and a C-phase detection angle of the C-phase detection leakage current leading the C-phase bus voltage are included in the detection data of the C-phase grading ring arrester. The third leakage current capacitive component increment-decrement model is: The third leakage current capacitive component increment-decrement model is: wherein I c1 is the leakage current value detected by the C phase, is the angle detected by the C phase, C1 is the target leakage current value of the C phase grading ring arrester, is the C phase target interference angle of the target leakage current of the C phase grading ring arrester leading the C phase bus voltage, x2 is the interference current value of the C phase grading ring arrester.

4. The detection method of the grading ring surge arrester according to claim 3, characterized in that, The B-phase detection leakage current value and a B-phase detection angle of the B-phase detection leakage current leading the B-phase bus voltage are included in the detection data of the B-phase grading ring arrester. The second leakage current capacitive component increment-decrement model is: The second leakage current capacitive component increment-decrement model is: wherein, I b1 is the B-phase detected leakage current value, is the B-phase detected angle, I B1 is the B-phase grading ring arrester target leakage current value, is the B-phase grading ring arrester target leakage current leading B-phase bus voltage B-phase target interference angle, I x3 and I x4 are the B-phase grading ring arrester interference current values; The interference current value I of the A-phase belt grading ring lightning arrester x1 The interference current value I of the C-phase belt grading ring lightning arrester x2 The interference current value I of the B-phase belt grading ring lightning arrester x3 And I x4 are equal.

5. The detection method of the grading ring surge arrester according to claim 4, characterized in that, The leakage current capacitive component equivalent model includes an A-phase and B-phase leakage current capacitive component equivalent model and an A-phase and C-phase leakage current capacitive component equivalent model. The A-phase and B-phase leakage current capacitive component equivalent model is: The A-phase and C-phase leakage current capacitive component equivalent model is: wherein, I A1 is a target leakage current value of the A-phase belt grading ring arrester, is an A-phase target interference angle of the target leakage current of the A-phase belt grading ring arrester leading the A-phase bus voltage, I C1 is a target leakage current value of the C-phase belt grading ring arrester, is a C-phase target interference angle of the target leakage current of the C-phase belt grading ring arrester leading the C-phase bus voltage, I B1 is a target leakage current value of the B-phase belt grading ring arrester, is a B-phase target interference angle of the target leakage current of the B-phase belt grading ring arrester leading the B-phase bus voltage.

6. The detection method of the grading ring surge arrester according to claim 5, characterized in that, The leakage current characteristic parameters include an A-phase leakage current resistive component of the A-phase grading ring arrester, a B-phase leakage current resistive component of the B-phase grading ring arrester, a C-phase leakage current resistive component of the C-phase grading ring arrester, an A-phase target interference angle of a target leakage current leading an A-phase bus voltage of the A-phase grading ring arrester, a B-phase target interference angle of a target leakage current leading a B-phase bus voltage of the B-phase grading ring arrester, and a C-phase target interference angle of a target leakage current leading a C-phase bus voltage of the C-phase grading ring arrester.

7. The detection method of the grading ring surge arrester according to claim 6, characterized in that, The A-phase leakage current resistive component I AR is: The B-phase leakage current resistive component I BR is: The C-phase leakage current resistive component is: The A-phase target interference angle is: The B-phase target interference angle is: The C-phase target interference angle is: wherein I a1 is the A-phase detected leakage current value, is the A-phase detected angle, I c1 is the C-phase detected leakage current value, is the C-phase detected angle, I b1 is the B-phase detected leakage current value, is the B-phase detected angle.

8. A detection device of a three-phase grading ring surge arrester for performing the detection method of the three-phase grading ring surge arrester according to any one of claims 1 to 7, characterized by The method comprises: The acquisition module is configured to acquire detection data of the three-phase grading ring arrester. The leakage current characteristic parameter determination module is configured to determine leakage current characteristic parameters of the three-phase grading ring arrester according to the phase diagram of the three-phase grading ring arrester, the leakage current characteristics of the three-phase grading ring arrester, and the detection data. The state determination module is configured to determine an insulation state of the three-phase grading ring arrester according to the leakage current characteristic parameters of the three-phase grading ring arrester.

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