Method and device for detecting three-phase lightning arresters near busbars

Abstract

The embodiment of the application discloses a detection method and device for a three-phase lightning arrester near a bus. The method comprises: obtaining detection data of the three-phase lightning arrester; determining a phase diagram between detection leakage current, target leakage current and interference current of the three-phase lightning arrester and an interference angle of the interference current leading the bus voltage according to the setting position of the three-phase lightning arrester; the phase diagram comprises an A-phase bus voltage interference phase diagram and a C-phase bus voltage interference phase diagram; thus, the leakage current characteristic parameters of the three-phase lightning arrester can be determined according to the A-phase bus voltage interference phase diagram, the leakage current characteristic of the three-phase lightning arrester, the detection data and the interference angle; or the leakage current characteristic parameters of the three-phase lightning arrester can be accurately determined according to the C-phase bus voltage interference phase diagram, the leakage current characteristic of the three-phase lightning arrester, the detection data and the interference angle; and the insulation state of the three-phase lightning arrester can be accurately determined according to the leakage current characteristic parameters.

Description

TECHNICAL FIELD

[0001] Embodiments of the present application relate to the technical field of power grid, and particularly relate to a detection method and device for a three-phase lightning arrester adjacent to a bus. BACKGROUND

[0002] Currently, the three-phase lightning arrester in a substation mainly adopts a method of testing leakage current under live line, and measures leakage current and resistive component of the three-phase lightning arrester in the running process to monitor the insulation state thereof. However, due to the complex electric field environment of an open substation, the three-phase lightning arrester adjacent to the bus will be disturbed by the coupling of the bus voltage, so that the leakage current of the three-phase lightning arrester will be mixed with the coupling current of the leading bus voltage, thereby causing interference to the detection result of the leakage current of the three-phase lightning arrester, resulting in inaccurate detection data, and further failing to accurately determine the insulation state of the three-phase lightning arrester. SUMMARY

[0003] Embodiments of the present application provide a detection method and device for a three-phase lightning arrester adjacent to a bus, to accurately obtain leakage current characteristic parameters of the three-phase lightning arrester, and further accurately determine the insulation state of the three-phase lightning arrester.

[0004] In a first aspect, embodiments of the present application provide a detection method for a three-phase lightning arrester adjacent to a bus, which comprises:

[0005] obtaining detection data of the three-phase lightning arrester;

[0006] determining a phase diagram between the detection leakage current, the target leakage current and the interference current of the three-phase lightning arrester and an interference angle of the interference current of the three-phase lightning arrester leading the bus voltage according to the setting position of the three-phase lightning arrester; the phase diagram comprises an A-phase bus voltage interference phase diagram and a C-phase bus voltage interference phase diagram;

[0007] determining leakage current characteristic parameters of the three-phase lightning arrester according to the A-phase bus voltage interference phase diagram, the leakage current characteristic of the three-phase lightning arrester, the detection data and the interference angle; or determining the leakage current characteristic parameters of the three-phase lightning arrester according to the C-phase bus voltage interference phase diagram, the leakage current characteristic of the three-phase lightning arrester, the detection data and the interference angle;

[0008] determining the insulation state of the three-phase lightning arrester according to the leakage current characteristic parameters.

[0009] Optionally, the step of determining the phase diagram between the detection leakage current, the target leakage current and the interference current of the three-phase lightning arrester comprises:

[0010] If the setting position of the three-phase surge arrester is adjacent to the A-phase bus, the phase diagram is the A-phase bus voltage interference phase diagram;

[0011] If the setting position of the three-phase surge arrester is adjacent to the C-phase bus, the phase diagram is the C-phase bus voltage interference phase diagram.

[0012] Optionally, the step of determining the interference current of the three-phase surge arrester leading the interference angle of the bus voltage includes:

[0013] If the setting position of the three-phase surge arrester is adjacent to the A-phase bus, the first leading angle of the interference current leading the A-phase bus voltage is 90°, and the interference angle of the interference current of the three-phase surge arrester leading the bus voltage is determined according to the first leading angle and the A-phase bus voltage interference phase diagram;

[0014] If the setting position of the three-phase surge arrester is adjacent to the C-phase bus, the second leading angle of the interference current leading the C-phase bus voltage is 90°, and the interference angle of the interference current of the three-phase surge arrester leading the bus voltage is determined according to the second leading angle and the C-phase bus voltage interference phase diagram.

[0015] Optionally, the leakage current characteristic parameter of the three-phase surge arrester is determined according to the A-phase bus voltage interference phase diagram, the leakage current characteristic of the three-phase surge arrester, the detection data, and the interference angle, including:

[0016] The first leakage current capacitive component increase-decrease model and the first leakage current resistive component increase-decrease model of the three-phase surge arrester are determined according to the A-phase bus voltage interference phase diagram, the detection data, and the interference angle;

[0017] The leakage current capacitive component equivalent model is determined according to the leakage current characteristic;

[0018] The leakage current characteristic parameter of the three-phase surge arrester is obtained according to the first leakage current capacitive component increase-decrease model, the first leakage current resistive component increase-decrease model, and the leakage current capacitive component equivalent model.

[0019] Optionally, the detection data includes the A-phase detection leakage current value and the A-phase detection angle of the A-phase detection leakage current leading the A-phase bus voltage of the A-phase surge arrester, the B-phase detection leakage current value and the B-phase detection angle of the B-phase detection leakage current leading the B-phase bus voltage of the B-phase surge arrester, and the C-phase detection leakage current value and the C-phase detection angle of the C-phase detection leakage current leading the C-phase bus voltage of the C-phase surge arrester.

[0020] The interference angles include an A-phase interference angle of the interference current of the A-phase surge arrester leading the A-phase voltage bus, a B-phase interference angle of the interference current of the B-phase surge arrester leading the B-phase voltage bus, and a C-phase interference angle of the interference current of the C-phase surge arrester leading the C-phase voltage bus.

[0021] The first leakage current capacitive component increment-decrement model includes a first A-phase leakage current capacitive component increment-decrement model, a first B-phase leakage current capacitive component increment-decrement model, and a first C-phase leakage current capacitive component increment-decrement model.

[0022] The first leakage current capacitive component increment-decrement model includes a first A-phase leakage current capacitive component increment-decrement model, a first B-phase leakage current capacitive component increment-decrement model, and a first C-phase leakage current capacitive component increment-decrement model.

[0023] 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.

[0024] The leakage current characteristic parameters include an A-phase leakage current resistive component, a B-phase leakage current resistive component, a C-phase leakage current resistive component, an A-phase target interference angle of the A-phase target leakage current of the A-phase surge arrester leading the A-phase bus voltage, a B-phase target interference angle of the B-phase target leakage current of the B-phase surge arrester leading the B-phase bus voltage, and a C-phase target interference angle of the C-phase target leakage current of the C-phase surge arrester leading the C-phase bus voltage.

[0025] Optionally, the first A-phase leakage current capacitive component increment-decrement model is:

[0026]

[0027] The first B-phase leakage current capacitive component increment-decrement model is:

[0028]

[0029] The first C-phase leakage current capacitive component increment-decrement model is:

[0030]

[0031] The first A-phase leakage current resistive component increment-decrement model is:

[0032]

[0033] The first B-phase leakage current resistive component increment-decrement model is:

[0034]

[0035] The first C-phase leakage current resistance component increase / decrease amount model is:

[0036]

[0037] The A-phase and B-phase leakage current capacitive component equivalent model is:

[0038]

[0039] The A-phase and C-phase leakage current capacitive component equivalent model is:

[0040]

[0041] The A-phase leakage current resistance component I A1R is:

[0042]

[0043] The B-phase leakage current resistance component I B1R is:

[0044]

[0045] The C-phase leakage current resistance component I C1R is:

[0046]

[0047] The A-phase target interference angle is:

[0048]

[0049] The B-phase target interference angle is:

[0050]

[0051] The C-phase target interference angle is:

[0052]

[0053] Wherein, I a1 is the A-phase detected leakage current value, is the A-phase detected angle, I A1 is the A-phase target leakage current value of the A-phase lightning arrester, I x is the interference current value, I b1 is the B-phase detected leakage current value, is the B-phase detected angle, I B1 is the B-phase target leakage current value of the B-phase lightning arrester, Ic1 detecting a leakage current value of the C phase, detecting an angle of the C phase, I C1 detecting a leakage current value of the C phase,

[0054] Optionally, according to the C-phase bus voltage interference phase diagram, the leakage current characteristic of the three-phase surge arrester, the detection data, and the interference angle, the leakage current characteristic parameter is determined, including:

[0055] According to the C-phase bus voltage interference phase diagram, the detection data, and the interference angle, a second leakage current capacitive component increase-decrease model and a second leakage current resistive component increase-decrease amount model of the three-phase surge arrester are determined;

[0056] According to the leakage current characteristic, a leakage current capacitive component equivalent model is determined;

[0057] According to the second leakage current capacitive component increase-decrease model, the second leakage current resistive component increase-decrease amount model, and the leakage current capacitive component equivalent model, a leakage current characteristic parameter of the three-phase surge arrester is obtained.

[0058] Optionally, the detection data includes an A-phase detection leakage current value of an A-phase surge arrester and an A-phase detection angle of the A-phase detection leakage current leading an A-phase bus voltage, a B-phase detection leakage current value of a B-phase surge arrester and a B-phase detection angle of the B-phase detection leakage current leading a B-phase bus voltage, and a C-phase detection leakage current value of a C-phase surge arrester and a C-phase detection angle of the C-phase detection leakage current leading a C-phase bus voltage.

[0059] The interference angle includes an A-phase interference angle of the interference current leading an A-phase voltage bus of an A-phase surge arrester, a B-phase interference angle of the interference current leading a B-phase voltage bus of a B-phase surge arrester, and a C-phase interference angle of the interference current leading a C-phase voltage bus of a C-phase surge arrester.

[0060] The second leakage current capacitive component increase-decrease model includes a second A-phase leakage current capacitive component increase-decrease model, a second B-phase leakage current capacitive component increase-decrease model, and a second C-phase leakage current capacitive component increase-decrease model.

[0061] The second leakage current resistive component increase-decrease amount model includes a second A-phase leakage current resistive component increase-decrease amount model, a second B-phase leakage current resistive component increase-decrease amount model, and a second C-phase leakage current resistive component increase-decrease amount model.

[0062] 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.

[0063] The leakage current characteristic parameters include an A-phase leakage current resistive component, a B-phase leakage current resistive component, a C-phase leakage current resistive component, an A-phase target leakage current of the A-phase arrester leading an A-phase target interference angle of the A-phase bus voltage, a B-phase target leakage current of the B-phase arrester leading a B-phase target interference angle of the B-phase bus voltage, and a C-phase target leakage current of the C-phase arrester leading a C-phase target interference angle of the C-phase bus voltage.

[0064] Optionally, the second C-phase leakage current capacitive component increase and decrease model is:

[0065]

[0066] The second A-phase leakage current capacitive component increase and decrease model is:

[0067]

[0068] The second B-phase leakage current capacitive component increase and decrease model is:

[0069]

[0070] The second C-phase leakage current resistive component increase and decrease amount model is:

[0071]

[0072] The second A-phase leakage current resistive component increase and decrease amount model is:

[0073]

[0074] The second B-phase leakage current resistive component increase and decrease amount model is:

[0075]

[0076] The A-phase and B-phase leakage current capacitive component equivalent amount model is:

[0077]

[0078] The A-phase and C-phase leakage current capacitive component equivalent amount model is:

[0079]

[0080] The C-phase leakage current resistive component I C1R is:

[0081]

[0082] The A-phase leakage current resistive component I A1R is:

[0083]

[0084] the B-phase target interference angle B1R is:

[0085]

[0086] the C-phase target interference angle is:

[0087]

[0088] the A-phase target interference angle is:

[0089]

[0090] the B-phase target interference angle is:

[0091]

[0092] wherein I a1 is the A-phase detected leakage current value, is the A-phase detected angle, I A1 is the A-phase target leakage current value of the A-phase arrester, I x is the interference current value, I b1 is the B-phase detected leakage current value, is the B-phase detected angle, I B1 is the B-phase target leakage current value of the B-phase arrester, I c1 is the C-phase detected leakage current value, is the C-phase detected angle, I C1 is the C-phase target leakage current value of the C-phase arrester.

[0093] In a second aspect, an embodiment of the present application further provides a detection device of a three-phase arrester adjacent to a bus, which comprises:

[0094] an acquisition module, configured to acquire detection data of the three-phase arrester;

[0095] a determination module, configured to determine, according to a setting position of the three-phase arrester, a phase diagram between a detected leakage current, a target leakage current and an interference current of the three-phase arrester and an interference angle of the interference current of the three-phase arrester leading bus voltage; the phase diagram comprises an A-phase bus voltage interference phase diagram and a C-phase bus voltage interference phase diagram;

[0096] The leakage current characteristic parameter determination module is configured to determine a leakage current characteristic parameter of the three-phase lightning arrester according to the A-phase bus voltage interference phase diagram, the leakage current characteristic of the three-phase lightning arrester, the detection data, and the interference angle; or determine the leakage current characteristic parameter of the three-phase lightning arrester according to the C-phase bus voltage interference phase diagram, the leakage current characteristic of the three-phase lightning arrester, the detection data, and the interference angle.

[0097] The judgment module is configured to determine an insulation state of the three-phase lightning arrester according to the leakage current characteristic parameter.

[0098] The embodiment of the present application determines a phase diagram between a detection leakage current, a target leakage current and an interference current of a three-phase lightning arrester and an interference angle of a bus voltage of the three-phase lightning arrester according to a setting position of the three-phase lightning arrester; the phase diagram includes an A-phase bus voltage interference phase diagram and a C-phase bus voltage interference phase diagram; determines a leakage current characteristic parameter of the three-phase lightning arrester according to the A-phase bus voltage interference phase diagram, the leakage current characteristic of the three-phase lightning arrester, the detection data and the interference angle; or determines the leakage current characteristic parameter of the three-phase lightning arrester according to the C-phase bus voltage interference phase diagram, the leakage current characteristic of the three-phase lightning arrester, the detection data and the interference angle; and determines an insulation state of the three-phase lightning arrester according to the leakage current characteristic parameter. Thus, the leakage current characteristic parameter of the three-phase lightning arrester can be accurately obtained by the above method, and the insulation state of the three-phase lightning arrester can be accurately determined. BRIEF DESCRIPTION OF DRAWINGS

[0099] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without any creative effort based on these drawings.

[0100] Figure 1 A flowchart of a detection method of a three-phase lightning arrester near a bus provided by the embodiment of the present application;

[0101] Figure 2 An A-phase bus voltage interference phase diagram provided by the embodiment of the present application;

[0102] Figure 3 A C-phase bus voltage interference phase diagram provided by the embodiment of the present application;

[0103] Figure 4A flowchart of steps for determining leakage current characteristic parameters of a three-phase lightning arrester according to a C-phase bus voltage interference phase diagram, leakage current characteristics of the three-phase lightning arrester, detection data, and an interference angle is provided for an embodiment of the present application.

[0104] Figure 5 A flowchart of steps for determining leakage current characteristic parameters according to a C-phase bus voltage interference phase diagram, leakage current characteristics of the three-phase lightning arrester, detection data, and an interference angle is provided for an embodiment of the present application.

[0105] Figure 6 A structural diagram of a detection device of a three-phase lightning arrester adjacent to a bus is provided for an embodiment of the present application. DETAILED DESCRIPTION

[0106] In order to enable 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.

[0107] 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 indicate a specific order or a chronological 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 that 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 that includes a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but can include other steps or units that are not clearly listed or inherent to the process, method, product, or device.

[0108] Figure 1 A flowchart of a detection method of a three-phase lightning arrester adjacent to a bus is provided for an embodiment of the present application. The present embodiment can be applied to a case where insulation detection of a three-phase lightning arrester is required, and the method can be executed by a detection device of a three-phase lightning arrester adjacent to a bus. Figure 1 As shown in the figure, the method specifically includes the following steps:

[0109] S110, obtaining detection data of a three-phase lightning arrester.

[0110] The detection data of the three-phase surge arrester includes a leakage current of each phase of the three-phase surge arrester and an angle at which the leakage current of each phase of the three-phase surge arrester leads the voltage of the corresponding phase bus.

[0111] Specifically, the detection data includes an A-phase detection leakage current value and an A-phase detection angle at which the A-phase detection leakage current leads the A-phase bus voltage of the A-phase surge arrester, 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 of the B-phase surge arrester, and 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 of the C-phase surge arrester.

[0112] S120, according to the setting position of the three-phase surge arrester, determining a phase diagram between the detection leakage current, the target leakage current and the interference current of the three-phase surge arrester and an interference angle at which the interference current of the three-phase surge arrester leads the bus voltage; the phase diagram includes an A-phase bus voltage interference phase diagram and a C-phase bus voltage interference phase diagram.

[0113] The detection leakage current of the three-phase surge arrester is the leakage current detected by the live test, the target leakage current of the three-phase surge arrester is the actual leakage current thereof, and the interference current of the three-phase surge arrester is the current generated by the interference of the bus voltage. The phase diagram between the detection leakage current, the target leakage current and the interference current of each phase of the three-phase surge arrester can show the data relationship between the detection leakage current, the target leakage current and the interference current of each phase of the three-phase surge arrester.

[0114] When the three-phase surge arrester is close to the A-phase bus, it will be affected by the A-phase bus voltage and generate a coupling current leading the A-phase voltage by 90°, and then be interfered by the coupling current leading the A-phase voltage by 90°. When the three-phase surge arrester is close to the C-phase bus, it will be affected by the C-phase bus voltage and generate a coupling current leading the C-phase voltage by 90°, and then be interfered by the coupling current leading the C-phase voltage by 90°. As can be seen, the position of the three-phase surge arrester is different, and the bus phase voltage of the three-phase surge arrester is different, so that the vector relationship between the detection leakage current, the target leakage current and the interference current of the three-phase surge arrester is different. Therefore, according to the setting position of the three-phase surge arrester, the phase diagram between the detection leakage current, the target leakage current and the interference current of the three-phase surge arrester is determined. The A-phase bus voltage interference phase diagram is a diagram of the vector relationship between the detection leakage current, the target leakage current and the interference current when the three-phase surge arrester is interfered by the generated coupling current leading the A-phase voltage by 90°. The C-phase bus voltage interference phase diagram is a diagram of the vector relationship between the detection leakage current, the target leakage current and the interference current when the three-phase surge arrester is interfered by the generated coupling current leading the C-phase voltage by 90°.

[0115] Exemplarily, Figure 2A phase bus voltage interference phase diagram provided for the embodiment of the present application, Figure 3 A C phase bus voltage interference phase diagram provided for the embodiment of the present application. Figure 2 And Figure 3 In the figure, the relationship between the detected leakage current of the A phase arrester, the target leakage current, and the interference current is marked, that is, In the figure, the relationship between the detected leakage current of the B phase arrester, the target leakage current, and the interference current is marked, that is, In the figure, the relationship between the detected leakage current of the C phase arrester, the target leakage current, and the interference current is marked, that is, According to and , the position relationship between the detected leakage current of the A phase arrester, the target leakage current, and the interference current, Figure 2 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, Figure 3 each interference current in is perpendicular to the A phase bus voltage U A , each interference current in is perpendicular to the C phase bus voltage U C . Figure 2 And In the figure, the A phase target leakage current of the A phase arrester Figure 3 leads the A phase target interference angle of the A phase bus voltage U A by In the figure, the B phase target leakage current of the B phase arrester Figure 2 leads the B phase target interference angle of the A phase bus voltage U A by Figure 3 In the figure, the C phase target leakage current of the C phase arrester leads the C phase target interference angle of the A phase bus voltage U A by

[0116] ​​​In addition, according to the setting position of the three-phase lightning arrester, the interference object (A-phase bus voltage or C-phase bus voltage) affecting the three-phase lightning arrester is confirmed, and according to the corresponding phase diagram, the angle at which the interference current of each phase lightning arrester leads the bus voltage of the corresponding phase is known, so that the interference angle at which the interference current of the three-phase lightning arrester leads the bus voltage is confirmed. The interference angle includes the angle at which the interference current of the A-phase lightning arrester leads the A-phase bus voltage, the angle at which the interference current of the B-phase lightning arrester leads the B-phase bus voltage, and the angle at which the interference current of the C-phase lightning arrester leads the C-phase bus voltage.

[0117] In S130, the leakage current characteristic parameter of the three-phase lightning arrester is determined according to the A-phase bus voltage interference phase diagram, the leakage current characteristic of the three-phase lightning arrester, the detection data, and the interference angle; or the leakage current characteristic parameter of the three-phase lightning arrester is determined according to the C-phase bus voltage interference phase diagram, the leakage current characteristic of the three-phase lightning arrester, the detection data, and the interference angle.

[0118] When the three-phase lightning arrester is adjacent to the A-phase bus, that is, is disturbed by the coupling current leading the A-phase voltage by 90°, the leakage current characteristic parameter of the three-phase lightning arrester can be determined according to the A-phase bus voltage interference phase diagram, the leakage current characteristic of the three-phase lightning arrester, the detection data, and the interference angle.

[0119] Specifically, according to the A-phase bus voltage interference phase diagram, the vector sum of the target leakage current and the interference current is equal to the detection leakage current, so that it can be confirmed that the target leakage current, the interference current, and the detection leakage current of each phase lightning arrester are all in the perpendicular direction leakage current capacitive component relationship of the corresponding phase bus voltage, and that the target leakage current, the interference current, and the detection leakage current of each phase lightning arrester are all in the leakage current resistive component relationship in the direction of the corresponding phase bus voltage. The known detection data and interference angle are brought into the leakage current capacitive component relationship to obtain a first leakage current capacitive component increase / decrease model. The known detection data and interference angle are brought into the leakage current resistive component relationship to obtain a first leakage current resistive component increase / decrease model.

[0120] Since the lightning arrester of each phase has the same model and structure, according to the leakage current characteristic, the leakage current capacitive components of the lightning arrester of each phase are equal, so that a leakage current capacitive component equal model is obtained.

[0121] The leakage current characteristic parameters include an A-phase leakage current resistive component, a B-phase leakage current resistive component, a C-phase leakage current resistive component, an A-phase target leakage current of the A-phase arrester leading an A-phase target interference angle of the A-phase bus voltage, a B-phase target leakage current of the B-phase arrester leading a B-phase target interference angle of the B-phase bus voltage, and a C-phase target leakage current of the C-phase arrester leading a C-phase target interference angle of the C-phase bus voltage. The A-phase leakage current resistive component is a component of the A-phase target leakage current in the direction of the A-phase bus voltage, the B-phase leakage current resistive component is a component of the B-phase target leakage current in the direction of the B-phase bus voltage, and the C-phase leakage current resistive component is a component of the C-phase target leakage current in the direction of the C-phase bus voltage.

[0122] In summary, the first leakage current capacitive component increment / decrement model, the first leakage current resistive component increment / decrement model, and the leakage current capacitive component equivalent model are combined and solved, and the leakage current characteristic parameters can be obtained.

[0123] In S140, the insulation state of the three-phase arrester is determined according to the leakage current characteristic parameters.

[0124] The leakage current resistive component is generated by the conduction of the three-phase arrester, and can reflect the insulation performance of the arrester. Therefore, the insulation state of the three-phase arrester can be determined according to the leakage current characteristic parameters.

[0125] In the embodiments of the present application, the detection data of the three-phase arrester is obtained, the phase diagram between the detection leakage current, the target leakage current, and the interference current of the three-phase arrester and the interference angle of the interference current leading the bus voltage of the three-phase arrester are determined according to the setting position of the three-phase arrester, the leakage current characteristic parameters of the three-phase arrester are determined according to the A-phase bus voltage interference phase diagram, the leakage current characteristic of the three-phase arrester, the detection data, and the interference angle, or the leakage current characteristic parameters of the three-phase arrester are determined according to the C-phase bus voltage interference phase diagram, the leakage current characteristic of the three-phase arrester, the detection data, and the interference angle, and the insulation state of the three-phase arrester is determined according to the leakage current characteristic parameters. Therefore, the leakage current characteristic parameters of the three-phase arrester can be accurately obtained by the above method, and the insulation state of the three-phase arrester can be accurately determined.

[0126] On the basis of the above embodiments, the step of determining the phase diagram between the detection leakage current, the target leakage current, and the interference current of the three-phase arrester includes:

[0127] If the setting position of the three-phase arrester is adjacent to the A-phase bus, the phase diagram is the A-phase bus voltage interference phase diagram.

[0128] The three-phase arrester is arranged near the A-phase bus, and is disturbed by the coupled current leading the A-phase voltage by 90°, and therefore needs to be adapted to the A-phase bus voltage disturbance phase diagram.

[0129] If the three-phase arrester is arranged near the C-phase bus, the phase diagram is the C-phase bus voltage disturbance phase diagram.

[0130] The three-phase arrester is arranged near the C-phase bus, and is disturbed by the coupled current leading the C-phase voltage by 90°, and therefore needs to be adapted to the C-phase bus voltage disturbance phase diagram.

[0131] On the basis of the above embodiment, optionally, the step of determining the disturbance angle of the disturbance current of the three-phase arrester leading the three-phase bus voltage comprises:

[0132] If the three-phase arrester is arranged near the A-phase bus, the first leading angle of the disturbance current leading the A-phase bus voltage is 90°, and the disturbance angle of the disturbance current of the three-phase arrester leading the bus voltage is determined according to the first leading angle and the A-phase bus voltage disturbance phase diagram.

[0133] The first leading angle of the disturbance current of the A-phase arrester, the B-phase arrester and the C-phase arrester leading the A-phase bus voltage is 90°, that is, the disturbance current of the A-phase arrester is perpendicular to the A-phase bus voltage, the disturbance current of the B-phase arrester is perpendicular to the A-phase bus voltage, and the disturbance current of the C-phase arrester is perpendicular to the A-phase bus voltage. According to the positional relationship between the disturbance current of the A-phase arrester, the B-phase arrester and the C-phase arrester and the A-phase bus voltage, the A-phase bus voltage disturbance phase diagram is geometrically analyzed, and it is known that the disturbance angle of the disturbance current of the A-phase arrester leading the A-phase voltage is 90°, the disturbance angle of the disturbance current of the B-phase arrester leading the B-phase voltage is 30°, and the disturbance angle of the disturbance current of the C-phase arrester leading the C-phase voltage is 30°.

[0134] If the three-phase arrester is arranged near the C-phase bus, the second leading angle of the disturbance current leading the C-phase bus voltage is 90°, and the disturbance angle of the disturbance current of the three-phase arrester leading the bus voltage is determined according to the second leading angle and the C-phase bus voltage disturbance phase diagram.

[0135] The interference current of the A-phase arrester, the interference current of the B-phase arrester and the interference current of the C-phase arrester all lead the first leading angle of the C-phase bus voltage by 90°, that is, the interference current of the A-phase arrester is perpendicular to the C-phase bus voltage, the interference current of the B-phase arrester is perpendicular to the C-phase bus voltage, and the interference current of the C-phase arrester is perpendicular to the C-phase bus voltage. According to the geometric analysis of the phase interference diagram of the C-phase bus voltage based on the position relationship between the interference current of the A-phase arrester, the interference current of the B-phase arrester and the interference current of the C-phase arrester and the C-phase bus voltage, it can be known that the interference current of the A-phase arrester leads the interference angle of the C-phase voltage by 30°, the interference current of the B-phase arrester leads the interference angle of the B-phase voltage by 30°, and the interference current of the C-phase arrester leads the interference angle of the C-phase voltage by 90°.

[0136] On the basis of the above-mentioned embodiments, optionally, Figure 4 A flowchart of the steps of determining the leakage current characteristic parameters of the three-phase arresters according to the phase interference diagram of the A-phase bus voltage, the leakage current characteristics of the three-phase arresters, the detection data and the interference angles is provided for the embodiments of the present application. As shown in Figure 4 , the steps of determining the leakage current characteristic parameters of the three-phase arresters according to the phase interference diagram of the A-phase bus voltage, the leakage current characteristics of the three-phase arresters, the detection data and the interference angles are described:

[0137] S210, determining the first leakage current capacitive component increase / decrease model and the first leakage current resistive component increase / decrease model of the three-phase arresters according to the phase interference diagram of the A-phase bus voltage, the detection data and the interference angles.

[0138] 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 three-phase arresters, and the first leakage current resistive component increase / decrease model is a model that can reflect the increase / decrease of the leakage current resistive component of the three-phase arresters.

[0139] Specifically, referring to Figure 2 , it can be known that The interference current is perpendicular to the A-phase bus voltage U A , and thus it can be known that the component of the target leakage current on the A-phase bus voltage U A is equal to the component of the detection leakage current on the A-phase bus voltage U A , and thus the increase / decrease of the leakage current resistive component of the A-phase arrester can be reflected; the component of the target leakage current in the perpendicular direction of the A-phase bus voltage U A plus the component of the interference current in the perpendicular direction of the A-phase bus voltage U A is equal to the detection leakage current the A-phase bus voltage U A the component in the vertical direction, thus reflecting the increase or decrease of the capacitive component of the leakage current of the A-phase surge arrester.

[0140] Reference is made to Figure 2 It can be seen that, according to the interference current the A-phase bus voltage U A perpendicular to the A-phase bus voltage U A the B-phase bus voltage U B the angle between the B-phase bus voltage U and the C-phase bus voltage U is 120°, etc., the interference current of the B-phase surge arrester the B-phase interference angle of the leading B-phase voltage U B is 30°, and the target leakage current the component on the B-phase bus voltage U B is equal to the difference between the detected leakage current the component on the B-phase bus voltage U B is equal to the interference current the component on the B-phase bus voltage U B , thus reflecting the increase or decrease of the resistive component of the leakage current of the B-phase surge arrester; the target leakage current the component in the vertical direction of the B-phase bus voltage U B is equal to the detected leakage current the component in the vertical direction of the B-phase bus voltage U B is equal to the interference current the component in the vertical direction of the B-phase bus voltage U B , thus reflecting the increase or decrease of the capacitive component of the leakage current of the B-phase surge arrester.

[0141] Reference is made to Figure 2 It can be seen that, according to the interference current the A-phase bus voltage U A perpendicular to the A-phase bus voltage U A the C-phase bus voltage U C the angle between the C-phase bus voltage U and the A-phase bus voltage U is 120°, etc., the interference current of the C-phase surge arrester the C-phase interference angle of the leading C-phase voltage U C is 30°, and the detected leakage current the component on the C-phase bus voltage U C is equal to the difference between the target leakage current the component on the C-phase bus voltage U C is equal to the interference current the component on the C-phase bus voltage U Ca component on the C-phase bus voltage Uc, thereby reflecting the increase or decrease of the resistive component of the leakage current of the C-phase surge arrester; the C-phase bus voltage Uc C a component in the vertical direction and detecting the leakage current the C-phase bus voltage Uc C the difference of the components in the vertical direction is equal to the interference current the C-phase bus voltage Uc C a component on the C-phase bus voltage Uc, thereby reflecting the increase or decrease of the capacitive component of the leakage current of the C-phase surge arrester.

[0142] In summary, according to the increase or decrease of the capacitive component of the leakage current of the A-phase surge arrester, the increase or decrease of the capacitive component of the leakage current of the B-phase surge arrester, and the increase or decrease of the capacitive component of the leakage current of the C-phase surge arrester, the first leakage current capacitive component increase and decrease model of the three-phase surge arrester can be determined; according to the increase or decrease of the resistive component of the leakage current of the A-phase surge arrester, the increase or decrease of the resistive component of the leakage current of the B-phase surge arrester, and the increase or decrease of the resistive component of the leakage current of the C-phase surge arrester, the first leakage current resistive component increase and decrease model of the three-phase surge arrester can be determined.

[0143] S220, according to the leakage current characteristics, determine the leakage current capacitive component equal model.

[0144] Among them, since the model and structure of each phase surge arrester are the same, according to the leakage current characteristics, the capacitive component of the leakage current of each phase surge arrester is equal, thereby obtaining the leakage current capacitive component equal model.

[0145] S230, according to the first leakage current capacitive component increase and decrease model, the first leakage current resistive component increase and decrease model, and the leakage current capacitive component equal model, obtain the leakage current characteristic parameters of the three-phase surge arrester.

[0146] Specifically, the first leakage current capacitive component increase and decrease model, the first leakage current resistive component increase and decrease model, and the leakage current capacitive component equal model are combined and solved, and the leakage current characteristic parameters can be solved.

[0147] On the basis of the above embodiment, optionally, the detection data includes the A-phase detection leakage current value of the A-phase surge arrester and the A-phase detection angle of the A-phase detection leakage current leading the A-phase bus voltage, the B-phase detection leakage current value of the B-phase surge arrester and the B-phase detection angle of the B-phase detection leakage current leading the B-phase bus voltage, and the C-phase detection leakage current value of the C-phase surge arrester and the C-phase detection angle of the C-phase detection leakage current leading the C-phase bus voltage.

[0148] The interference angles include an A-phase interference angle of an interference current of the A-phase surge arrester leading an A-phase voltage bus, a B-phase interference angle of an interference current of the B-phase surge arrester leading a B-phase voltage bus, and a C-phase interference angle of an interference current of the C-phase surge arrester leading a C-phase voltage bus.

[0149] The A-phase interference angle is 90°, the B-phase interference angle is 30°, and the C-phase interference angle is 30°.

[0150] Optionally, on the basis of the above-mentioned embodiment, the first leakage current capacitive component increase-decrease model includes a first A-phase leakage current capacitive component increase-decrease model, a first B-phase leakage current capacitive component increase-decrease model, and a first C-phase leakage current capacitive component increase-decrease model.

[0151] Specifically, the first A-phase leakage current capacitive component increase-decrease model is:

[0152]

[0153] The first B-phase leakage current capacitive component increase-decrease model is:

[0154]

[0155] The first C-phase leakage current capacitive component increase-decrease model is:

[0156]

[0157] I a1 is an A-phase detected leakage current value, is an A-phase detected angle, I A1 is an A-phase target leakage current value of the A-phase surge arrester, is an A-phase target angle of the A-phase target leakage current value of the A-phase surge arrester leading an A-phase bus voltage, I x is an interference current value, I b1 is a B-phase detected leakage current value, is a B-phase detected angle, I B1 is a B-phase target leakage current value of the B-phase surge arrester, is a B-phase target angle of the B-phase target leakage current value of the B-phase surge arrester leading a B-phase bus voltage, I c1 is a C-phase detected leakage current value, is a C-phase detected angle, I C1 is a C-phase target leakage current value of the C-phase surge arrester, is a C-phase target angle of the C-phase target leakage current value of the C-phase surge arrester leading a C-phase bus voltage.

[0158] On the basis of the above-mentioned embodiment, optionally, the first leakage current resistive component increment / decrement model comprises a first A-phase leakage current resistive component increment / decrement model, a first B-phase leakage current resistive component increment / decrement model, and a first C-phase leakage current resistive component increment / decrement model.

[0159] Specifically, the first A-phase leakage current resistive component increment / decrement model is:

[0160]

[0161] The first B-phase leakage current resistive component increment / decrement model is:

[0162]

[0163] The first C-phase leakage current resistive component increment / decrement model is:

[0164]

[0165] wherein I a1 is an A-phase detected leakage current value, is an A-phase detected angle, I A1 is an A-phase target leakage current value of the A-phase arrester, is an A-phase target angle of the A-phase target leakage current value of the A-phase arrester leading the A-phase bus voltage, I x is an interference current value, I b1 is a B-phase detected leakage current value, is a B-phase detected angle, I B1 is a B-phase target leakage current value of the B-phase arrester, is a B-phase target angle of the B-phase target leakage current value of the B-phase arrester leading the B-phase bus voltage, I c1 is a C-phase detected leakage current value, is a C-phase detected angle, I C1 is a C-phase target leakage current value of the C-phase arrester, is a C-phase target angle of the C-phase target leakage current value of the C-phase arrester leading the C-phase bus voltage.

[0166] On the basis of the above-mentioned embodiment, optionally, the leakage current capacitive component equivalent model comprises A-phase and B-phase leakage current capacitive component equivalent models; and A-phase and C-phase leakage current capacitive component equivalent models.

[0167] Specifically, the A-phase and B-phase leakage current capacitive component equivalent model is:

[0168]

[0169] The A-phase and C-phase leakage current capacitive component equivalent model is:

[0170]

[0171] wherein, I A1 is a target leakage current value of the A-phase arrester, is a target angle of the A-phase target leakage current value of the A-phase arrester leading the A-phase bus voltage, I B1 is a target leakage current value of the B-phase arrester, is a target angle of the B-phase target leakage current value of the B-phase arrester leading the B-phase bus voltage, I C1 is a target leakage current value of the C-phase arrester, is a target angle of the C-phase target leakage current value of the C-phase arrester leading the C-phase bus voltage.

[0172] On the basis of the above-mentioned embodiments, optionally, the leakage current characteristic parameters include an A-phase leakage current resistive component, a B-phase leakage current resistive component, a C-phase leakage current resistive component, an A-phase target interference angle of the A-phase target leakage current of the A-phase arrester leading the A-phase bus voltage, a B-phase target interference angle of the B-phase target leakage current of the B-phase arrester leading the B-phase bus voltage, and a C-phase target interference angle of the C-phase target leakage current of the C-phase arrester leading the C-phase bus voltage.

[0173] wherein, the A-phase leakage current resistive component is a component of the A-phase target leakage current of the A-phase arrester in the direction of the A-phase bus voltage, the B-phase leakage current resistive component is a component of the B-phase target leakage current in the direction of the B-phase bus voltage, and the C-phase leakage current resistive component is a component of the C-phase target leakage current in the direction of the C-phase bus voltage.

[0174] Specifically, the A-phase leakage current resistive component I A1R is:

[0175]

[0176] the B-phase leakage current resistive component I B1R is:

[0177]

[0178] the C-phase leakage current resistive component I C1R is:

[0179]

[0180] the A-phase target interference angle is:

[0181]

[0182] the B-phase target interference angle is:

[0183]

[0184] C-phase target interference angle is:

[0185]

[0186] wherein, I a1 is the A-phase detected leakage current value, is the A-phase detection angle, I A1 is the A-phase target leakage current value of the A-phase arrester, I x is the interference current value, I b1 is the B-phase detected leakage current value, is the B-phase detection angle, I B1 is the B-phase target leakage current value of the B-phase arrester, I c1 is the C-phase detected leakage current value, is the C-phase detection angle, I C1 is the C-phase target leakage current value of the C-phase arrester.

[0187] Optionally, on the basis of the above-mentioned embodiments, Figure 5 is a flowchart of a step of determining leakage current characteristic parameters according to a C-phase bus voltage interference phase diagram, leakage current characteristics of a three-phase arrester, detection data, and an interference angle, provided by the embodiments of the present application. As Figure 5 shown, the step of determining leakage current characteristic parameters according to a C-phase bus voltage interference phase diagram, leakage current characteristics of a three-phase arrester, detection data, and an interference angle is described:

[0188] S310, according to the C-phase bus voltage interference phase diagram, the detection data, and the interference angle, determining a second leakage current capacitive component increase-decrease model and a second leakage current resistive component increase-decrease model of the three-phase arrester.

[0189] wherein, the second leakage current capacitive component increase-decrease model is a model that can reflect the increase-decrease of the leakage current capacitive component of the three-phase arrester, and the second leakage current resistive component increase-decrease model is a model that can reflect the increase-decrease of the leakage current resistive component of the three-phase arrester.

[0190] Specifically, referring to Figure 3 it can be known that interference current is perpendicular to the C-phase bus voltage U C , so it can be known that the target leakage current on the C-phase bus voltage U C is equal to the detected leakage current The C-phase bus voltage U C The component above reflects the increase or decrease of the resistive component of the leakage current of the C-phase surge arrester; the target leakage current The C-phase bus voltage U C Vertical component plus interference current The C-phase bus voltage U C The vertical component equals the detected leakage current. The C-phase bus voltage U C The vertical component reflects the increase or decrease of the capacitive component of the leakage current of the C-phase surge arrester.

[0191] refer to Figure 3 It can be seen that, according to Interference current With C-phase bus voltage U C Vertical, C-phase bus voltage U C With phase A bus voltage U A Based on positional information such as an included angle of 120°, the interference current of phase A surge arrester can be determined. Leading phase A voltage U A The interference angle of phase A is 30°, and the target leakage current is... The bus voltage U of phase A A The component on the detection leakage current The bus voltage U of phase A A The difference between the components is equal to the interference current. The bus voltage U of phase A A The component on the upper part reflects the increase or decrease of the resistive component of the leakage current of phase A surge arrester; target leakage current The bus voltage U of phase A A Vertical component and detection leakage current The bus voltage U of phase A A The vertical component equals the interference current. The bus voltage U of phase A A The vertical component reflects the increase or decrease of the capacitive component of the leakage current of phase A surge arrester.

[0192] refer to Figure 3 It can be seen that, according to Interference current With C-phase bus voltage U C Vertical, B-phase bus voltage U B With C-phase bus voltage U C Based on positional information such as an included angle of 120°, the interference current of phase B surge arrester can be determined. Leading phase B voltage U BThe B-phase interference angle is 30°, and the leakage current is detected The component on the B-phase bus voltage U B is equal to the target leakage current The difference between the component on the B-phase bus voltage U B is equal to the interference current The component on the B-phase bus voltage U B , so as to reflect the increase or decrease of the leakage current resistance component of the B-phase arrester; the target leakage current The component in the vertical direction of the B-phase bus voltage U B is equal to the detected leakage current The difference between the component in the vertical direction of the B-phase bus voltage U B is equal to the interference current The component on the B-phase bus voltage U B , so as to reflect the increase or decrease of the leakage current capacitance component of the B-phase arrester.

[0193] In summary, according to the increase or decrease of the leakage current capacitance component of the A-phase arrester, the increase or decrease of the leakage current capacitance component of the B-phase arrester, and the increase or decrease of the leakage current capacitance component of the C-phase arrester, the second leakage current capacitance component increase and decrease model of the three-phase arrester can be determined; according to the increase or decrease of the leakage current resistance component of the A-phase arrester, the increase or decrease of the leakage current resistance component of the B-phase arrester, and the increase or decrease of the leakage current resistance component of the C-phase arrester, the second leakage current resistance component increase and decrease model of the three-phase arrester can be determined.

[0194] S320, according to the leakage current characteristics, determine the leakage current capacitance component equal model.

[0195] Wherein, since each phase arrester model and structure are the same, according to the leakage current characteristics, the leakage current capacitance component of each phase arrester is equal, thus obtaining the leakage current capacitance component equal model.

[0196] S330, according to the second leakage current capacitance component increase and decrease model, the second leakage current resistance component increase and decrease model, and the leakage current capacitance component equal model, obtain the leakage current characteristic parameters of the three-phase arrester.

[0197] Specifically, the second leakage current capacitance component increase and decrease model, the second leakage current resistance component increase and decrease model, and the leakage current capacitance component equal model are combined and solved, and the leakage current characteristic parameters can be obtained.

[0198] On the basis of the above-mentioned embodiment, optionally, the detection data comprises an A-phase detection leakage current value of the A-phase surge arrester and an A-phase detection angle of the A-phase detection leakage current leading the A-phase bus voltage, a B-phase detection leakage current value of the B-phase surge arrester and a B-phase detection angle of the B-phase detection leakage current leading the B-phase bus voltage, and a C-phase detection leakage current value of the C-phase surge arrester and a C-phase detection angle of the C-phase detection leakage current leading the C-phase bus voltage.

[0199] The interference angle comprises an A-phase interference angle of the interference current leading the A-phase voltage bus, a B-phase interference angle of the interference current leading the B-phase voltage bus, and a C-phase interference angle of the interference current leading the C-phase voltage bus.

[0200] In the above-mentioned embodiment, optionally, the second leakage current capacitive component increase-decrease model comprises a second A-phase leakage current capacitive component increase-decrease model, a second B-phase leakage current capacitive component increase-decrease model, and a second C-phase leakage current capacitive component increase-decrease model.

[0201] Specifically, the second C-phase leakage current capacitive component increase-decrease model is:

[0202]

[0203] The second A-phase leakage current capacitive component increase-decrease model is:

[0204]

[0205] The second B-phase leakage current capacitive component increase-decrease model is:

[0206]

[0207] wherein I a1 is the A-phase detection leakage current value, is the A-phase detection angle, I A1 is the A-phase target leakage current value of the A-phase surge arrester, is an A-phase target angle of the A-phase target leakage current value of the A-phase surge arrester leading the A-phase bus voltage, I x is the interference current value, I b1 is the B-phase detection leakage current value, is the B-phase detection angle, I B1 is the B-phase target leakage current value of the B-phase surge arrester, is a B-phase target angle of the B-phase target leakage current value of the B-phase surge arrester leading the B-phase bus voltage, I c1 is the C-phase detection leakage current value, is the C-phase detection angle, I C1The C-phase target leakage current value of the C-phase surge arrester, The C-phase target angle of the C-phase target leakage current value of the C-phase surge arrester leading the C-phase bus voltage.

[0208] On the basis of the above-mentioned embodiments, optionally, the second leakage current resistance component increment / decrement model comprises a second A-phase leakage current resistance component increment / decrement model, a second B-phase leakage current resistance component increment / decrement model and a second C-phase leakage current resistance component increment / decrement model.

[0209] The second C-phase leakage current resistance component increment / decrement model is:

[0210]

[0211] The second A-phase leakage current resistance component increment / decrement model is:

[0212]

[0213] The second B-phase leakage current resistance component increment / decrement model is:

[0214]

[0215] Wherein, I a1 The A-phase detected leakage current value, The A-phase detected angle, I A1 The A-phase target leakage current value of the A-phase surge arrester, The A-phase target angle of the A-phase target leakage current value of the A-phase surge arrester leading the A-phase bus voltage, I x The interference current value, I b1 The B-phase detected leakage current value, The B-phase detected angle, I B1 The B-phase target leakage current value of the B-phase surge arrester, The B-phase target angle of the B-phase target leakage current value of the B-phase surge arrester leading the B-phase bus voltage, I c1 The C-phase detected leakage current value, The C-phase detected angle, I C1 The C-phase target leakage current value of the C-phase surge arrester, The C-phase target angle of the C-phase target leakage current value of the C-phase surge arrester leading the C-phase bus voltage.

[0216] On the basis of the above-mentioned embodiments, optionally, the leakage current capacitive component equivalent model comprises A-phase and B-phase leakage current capacitive component equivalent models; A-phase and C-phase leakage current capacitive component equivalent models.

[0217] Specifically, the A-phase and B-phase leakage current capacitive component equivalent model is:

[0218]

[0219] The equivalent model of the capacitive component of the leakage current of phase A and phase C is:

[0220]

[0221] wherein I A1 is the target leakage current value of phase A of the phase A arrester, is the target angle of the target leakage current value of phase A of the phase A arrester leading the phase A bus voltage, I B1 is the target leakage current value of phase B of the phase B arrester, is the target angle of the target leakage current value of phase B of the phase B arrester leading the phase B bus voltage, I C1 is the target leakage current value of phase C of the phase C arrester, is the target angle of the target leakage current value of phase C of the phase C arrester leading the phase C bus voltage.

[0222] On the basis of the above embodiment, optionally, the leakage current characteristic parameters include the resistive component of the leakage current of phase A, the resistive component of the leakage current of phase B, the resistive component of the leakage current of phase C, the target interference angle of the target leakage current of phase A of the phase A arrester leading the phase A bus voltage, the target interference angle of the target leakage current of phase B of the phase B arrester leading the phase B bus voltage, and the target interference angle of the target leakage current of phase C of the phase C arrester leading the phase C bus voltage.

[0223] wherein the resistive component of the leakage current of phase A is the component of the target leakage current of phase A of the phase A arrester in the direction of the phase A bus voltage, the resistive component of the leakage current of phase B is the component of the target leakage current of phase B in the direction of the phase B bus voltage, and the resistive component of the leakage current of phase C is the component of the target leakage current of phase C in the direction of the phase C bus voltage. Specifically, the resistive component of the leakage current of phase C I C1R is:

[0224]

[0225] The resistive component of the leakage current of phase A I A1R is:

[0226]

[0227] The resistive component of the leakage current of phase B I B1R is:

[0228]

[0229] The target interference angle of phase C is:

[0230]

[0231] A phase target interference angle is:

[0232]

[0233] B phase target interference angle is:

[0234]

[0235] wherein, I a1 is an A phase detected leakage current value, is an A phase detection angle, I A1 is an A phase target leakage current value of the A phase arrester, I x is an interference current value, I b1 is a B phase detected leakage current value, is a B phase detection angle, I B1 is a B phase target leakage current value of the B phase arrester, I c1 is a C phase detected leakage current value, is a C phase detection angle, I C1 is a C phase target leakage current value of the C phase arrester.

[0236] Optionally, based on the above embodiment, Figure 6 is a structural schematic diagram of a detection device of a three-phase arrester adjacent to a busbar provided by the embodiment. As Figure 6 shown, the detection device of the three-phase arrester adjacent to the busbar comprises:

[0237] an acquisition module 410, configured to acquire detection data of the three-phase arrester;

[0238] a determination module 420, configured to determine a phase diagram between a detected leakage current, a target leakage current and an interference current of the three-phase arrester and an interference angle of the interference current of the three-phase arrester leading the busbar voltage according to a setting position of the three-phase arrester; the phase diagram comprises an A phase busbar voltage interference phase diagram and a C phase busbar voltage interference phase diagram;

[0239] a leakage current characteristic parameter determination module 430, configured to determine a leakage current characteristic parameter of the three-phase arrester according to the A phase busbar voltage interference phase diagram, a leakage current characteristic of the three-phase arrester, the detection data and the interference angle; or, determine the leakage current characteristic parameter of the three-phase arrester according to the C phase busbar voltage interference phase diagram, the leakage current characteristic of the three-phase arrester, the detection data and the interference angle;

[0240] a judgment module 440, configured to determine an insulation state of the three-phase arrester according to the leakage current characteristic parameter.

[0241] The embodiment of the present application acquires detection data of the three-phase lightning arrester through the acquisition module 410; determines the phase diagram between the detection leakage current, the target leakage current and the interference current of the three-phase lightning arrester and the interference angle of the interference current of the three-phase lightning arrester in advance of the bus voltage according to the setting position of the three-phase lightning arrester through the determination module 420; the phase diagram includes the A-phase bus voltage interference phase diagram and the C-phase bus voltage interference phase diagram; the leakage current characteristic parameter determination module 430 determines the leakage current characteristic parameter of the three-phase lightning arrester according to the A-phase bus voltage interference phase diagram, the leakage current characteristic of the three-phase lightning arrester, the detection data and the interference angle; or, determines the leakage current characteristic parameter of the three-phase lightning arrester according to the C-phase bus voltage interference phase diagram, the leakage current characteristic of the three-phase lightning arrester, the detection data and the interference angle; and the judgment module 440 determines the insulation state of the three-phase lightning arrester according to the leakage current characteristic parameter. Thus, the present scheme can accurately obtain the leakage current characteristic parameter of the three-phase lightning arrester, and then accurately determine the insulation state of the three-phase lightning arrester.

[0242] On the basis of the above-mentioned embodiments, the determination module can include a first phase diagram matching unit, which is specifically configured to:

[0243] If the setting position of the three-phase lightning arrester is adjacent to the A-phase bus, the phase diagram is the A-phase bus voltage interference phase diagram;

[0244] If the setting position of the three-phase lightning arrester is adjacent to the C-phase bus, the phase diagram is the C-phase bus voltage interference phase diagram.

[0245] On the basis of the above-mentioned embodiments, the determination module can include an interference angle determination unit, which is specifically configured to:

[0246] If the setting position of the three-phase lightning arrester is adjacent to the A-phase bus, the first lead angle of the interference current in advance of the A-phase bus voltage is 90°, and the interference angle of the interference current of the three-phase lightning arrester in advance of the bus voltage is determined according to the first lead angle and the A-phase bus voltage interference phase diagram;

[0247] If the setting position of the three-phase lightning arrester is adjacent to the C-phase bus, the second lead angle of the interference current in advance of the C-phase bus voltage is 90°, and the interference angle of the interference current of the three-phase lightning arrester in advance of the bus voltage is determined according to the second lead angle and the C-phase bus voltage interference phase diagram.

[0248] On the basis of the above-mentioned embodiments, the leakage current characteristic parameter determination module can include a first leakage current characteristic parameter determination unit;

[0249] The first leakage current characteristic parameter determination unit is specifically configured to:

[0250] According to the A-phase bus voltage interference phase diagram, the detection data and the interference angle, a first leakage current capacitive component increase / decrease model and a first leakage current resistive component increase / decrease model of the three-phase surge arrester are determined;

[0251] According to the leakage current characteristics, a leakage current capacitive component equivalent model is determined;

[0252] According to the first leakage current capacitive component increase / decrease model, the first leakage current resistive component increase / decrease model and the leakage current capacitive component equivalent model, leakage current characteristic parameters of the three-phase surge arrester are obtained.

[0253] On the basis of the above embodiment, the leakage current characteristic parameter determination module further comprises a second leakage current characteristic parameter determination unit;

[0254] The second leakage current characteristic parameter determination unit is specifically configured to:

[0255] According to the C-phase bus voltage interference phase diagram, the detection data and the interference angle, a second leakage current capacitive component increase / decrease model and a second leakage current resistive component increase / decrease model of the three-phase surge arrester are determined;

[0256] According to the leakage current characteristics, a leakage current capacitive component equivalent model is determined;

[0257] According to the second leakage current capacitive component increase / decrease model, the second leakage current resistive component increase / decrease model and the leakage current capacitive component equivalent model, leakage current characteristic parameters of the three-phase surge arrester are obtained.

[0258] It should be understood that the various forms of flow shown above can be used to reorder, add or delete 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, which is not limited herein.

[0259] The above specific embodiments do 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 modification, equivalent replacement and improvement within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A method of detecting a three-phase surge arrester in proximity to a bus, characterized by, The method comprises the steps of: acquiring detection data of the three-phase surge arrester; determining a phase diagram between a detection leakage current, a target leakage current and an interference current of the three-phase surge arrester and an interference angle of the interference current of the three-phase surge arrester leading a bus voltage according to a setting position of the three-phase surge arrester; the phase diagram comprises an A-phase bus voltage interference phase diagram and a C-phase bus voltage interference phase diagram; determining a leakage current characteristic parameter of the three-phase surge arrester according to the A-phase bus voltage interference phase diagram, a leakage current characteristic of the three-phase surge arrester, the detection data and the interference angle; or, determining a leakage current characteristic parameter of the three-phase surge arrester according to the C-phase bus voltage interference phase diagram, a leakage current characteristic of the three-phase surge arrester, the detection data and the interference angle; determining an insulation state of the three-phase surge arrester according to the leakage current characteristic parameter; the leakage current characteristic parameter comprises an A-phase leakage current resistive component, a B-phase leakage current resistive component, a C-phase leakage current resistive component, an A-phase target interference angle of an A-phase target leakage current of an A-phase surge arrester leading an A-phase bus voltage, a B-phase target interference angle of a B-phase target leakage current of a B-phase surge arrester leading a B-phase bus voltage and a C-phase target interference angle of a C-phase target leakage current of a C-phase surge arrester leading a C-phase bus voltage; The A-phase leakage current resistive component I A1R is: The B-phase leakage current resistive component I B1R is: The C-phase leakage current resistive component I C1R 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 detection angle, I A1 is the A-phase target leakage current value of the A-phase arrester, I x is the disturbance current value, I b1 wherein I is the B-phase detection angle, I B1 is the B-phase target leakage current value of the B-phase arrester, I c1 wherein I is the C-phase detection angle, I C1 is the C-phase target leakage current value of the C-phase arrester.

2. The detection method of a three-phase surge arrester in proximity to a bus according to claim 1, characterized by, the step of determining the phase diagram between the detection leakage current, the target leakage current and the interference current of the three-phase surge arrester comprises: if the setting position of the three-phase surge arrester is adjacent to an A-phase bus, the phase diagram is the A-phase bus voltage interference phase diagram; if the setting position of the three-phase surge arrester is adjacent to a C-phase bus, the phase diagram is the C-phase bus voltage interference phase diagram.

3. The detection method of a three-phase surge arrester in proximity to a bus according to claim 2, characterized by, the step of determining the interference angle of the interference current of the three-phase surge arrester leading the three-phase bus voltage comprises: if the setting position of the three-phase surge arrester is adjacent to an A-phase bus, a first leading angle of the interference current leading an A-phase bus voltage is 90°, and the interference angle of the interference current of the three-phase surge arrester leading the bus voltage is determined according to the first leading angle and the A-phase bus voltage interference phase diagram; if the setting position of the three-phase surge arrester is adjacent to a C-phase bus, a second leading angle of the interference current leading a C-phase bus voltage is 90°, and the interference angle of the interference current of the three-phase surge arrester leading the bus voltage is determined according to the second leading angle and the C-phase bus voltage interference phase diagram.

4. The detection method of a three-phase surge arrester adjacent to a bus according to claim 1, characterized by, determining the leakage current characteristic parameter of the three-phase surge arrester according to the A-phase bus voltage interference phase diagram, the leakage current characteristic of the three-phase surge arrester, the detection data and the interference angle comprises: determining a first leakage current capacitive component increment-decrement model and a first leakage current resistive component increment-decrement model of the three-phase surge arrester according to the A-phase bus voltage interference phase diagram, the detection data and the interference angle; determining a leakage current capacitive component equivalent model according to the leakage current characteristic; According to the first leakage current capacitive component increment-decrement model, the first leakage current resistive component increment-decrement model, and the leakage current capacitive component equivalent model, leakage current characteristic parameters of the three-phase surge arrester are obtained.

5. The detection method of a three-phase surge arrester in proximity to a bus according to claim 4, characterized by, The detection data includes an A-phase detection leakage current value and an A-phase detection angle of the A-phase detection leakage current leading an A-phase bus voltage of the A-phase surge arrester, a B-phase detection leakage current value and a B-phase detection angle of the B-phase detection leakage current leading a B-phase bus voltage of the B-phase surge arrester, and a C-phase detection leakage current value and a C-phase detection angle of the C-phase detection leakage current leading a C-phase bus voltage of the C-phase surge arrester. The interference angle includes an A-phase interference angle of the interference current leading an A-phase voltage bus of the A-phase surge arrester, a B-phase interference angle of the interference current leading a B-phase voltage bus of the B-phase surge arrester, and a C-phase interference angle of the interference current leading a C-phase voltage bus of the C-phase surge arrester. The first leakage current capacitive component increment-decrement model includes a first A-phase leakage current capacitive component increment-decrement model, a first B-phase leakage current capacitive component increment-decrement model, and a first C-phase leakage current capacitive component increment-decrement model. The first leakage current resistive component increment-decrement model includes a first A-phase leakage current resistive component increment-decrement model, a first B-phase leakage current resistive component increment-decrement model, and a first C-phase leakage current resistive component increment-decrement model. 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.

6. The detection method of a three-phase surge arrester in proximity to a bus according to claim 5, characterized by, The first A-phase leakage current capacitive component increment-decrement model is: The first B-phase leakage current capacitive component increment-decrement model is: The first C-phase leakage current capacitive component increment-decrement model is: The first A-phase leakage current resistive component increment-decrement model is: The first B-phase leakage current resistive component increment-decrement model is: The first C-phase leakage current resistive component increment-decrement model is: 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:

7. The detection method of a three-phase surge arrester in proximity to a bus according to claim 1, characterized by, According to the C-phase bus voltage interference phase diagram, the leakage current characteristic of the three-phase surge arrester, the detection data, and the interference angle, the leakage current characteristic parameters are determined, including: According to the C-phase bus voltage interference phase diagram, the detection data, and the interference angle, a second leakage current capacitive component increment-decrement model and a second leakage current resistive component increment-decrement model of the three-phase surge arrester are determined. According to the leakage current characteristic, a leakage current capacitive component equivalent model is determined. According to the second leakage current capacitive component increment-decrement model, the second leakage current resistive component increment-decrement model, and the leakage current capacitive component equivalent model, leakage current characteristic parameters of the three-phase surge arrester are obtained.

8. The detection method of a three-phase surge arrester adjacent to a bus according to claim 7, characterized by, The detection data includes an A-phase detection leakage current value and an A-phase detection angle of the A-phase detection leakage current leading an A-phase bus voltage of the A-phase arrester, a B-phase detection leakage current value and a B-phase detection angle of the B-phase detection leakage current leading a B-phase bus voltage of the B-phase arrester, and a C-phase detection leakage current value and a C-phase detection angle of the C-phase detection leakage current leading a C-phase bus voltage of the C-phase arrester; The interference angle includes an A-phase interference angle of the interference current leading an A-phase voltage bus of the A-phase arrester, a B-phase interference angle of the interference current leading a B-phase voltage bus of the B-phase arrester, and a C-phase interference angle of the interference current leading a C-phase voltage bus of the C-phase arrester; The second leakage current capacitive component increment-decrement model includes a second A-phase leakage current capacitive component increment-decrement model, a second B-phase leakage current capacitive component increment-decrement model, and a second C-phase leakage current capacitive component increment-decrement model; The second leakage current capacitive component increment-decrement model includes a second A-phase leakage current capacitive component increment-decrement model, a second B-phase leakage current capacitive component increment-decrement model, and a second C-phase leakage current capacitive component increment-decrement model; 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 leakage current characteristic parameter includes an A-phase leakage current resistive component, a B-phase leakage current resistive component, a C-phase leakage current resistive component, an A-phase target interference angle of an A-phase target leakage current leading an A-phase bus voltage of the A-phase arrester, a B-phase target interference angle of a B-phase target leakage current leading a B-phase bus voltage of the B-phase arrester, and a C-phase target interference angle of a C-phase target leakage current leading a C-phase bus voltage of the C-phase arrester.

9. The detection method of a three-phase surge arrester in proximity to a bus according to claim 8, characterized by, The second C-phase leakage current capacitive component increment-decrement model is: The second A-phase leakage current capacitive component increasing and decreasing model is: The second B-phase leakage current capacitive component increase / decrease model is: The second C-phase leakage current resistance component increase / decrease amount model is: The second A-phase leakage current resistance component increase / decrease amount model is: The second B-phase leakage current resistance component increase / decrease amount model is: The A-phase and B-phase leakage current capacitive component equivalent models are: The A-phase and C-phase leakage current capacitive component equivalent model is: The C-phase leakage current resistive component I C1R is: The A-phase leakage current resistive component I A1R is: The B-phase leakage current resistive component I B1R is: The C-phase target interference angle is: The A-phase target interference angle is: The B-phase target interference angle is: wherein I a1 is the A-phase detected leakage current value, is the A-phase detection angle, I A1 is the A-phase target leakage current value of the A-phase surge arrester, I x is the disturbance current value, I b1 is the B-phase detected leakage current value, is the B-phase detection angle, I B1 is the B-phase target leakage current value of the B-phase surge arrester, I c1 is the C-phase detected leakage current value, is the C-phase detection angle, I C1 is the C-phase target leakage current value of the C-phase surge arrester.

10. A detection device for a three-phase surge arrester in proximity to a bus, characterized in that including: The acquisition module is configured to acquire detection data of the three-phase arrester; The determination module is configured to determine a phase diagram between detection leakage current, target leakage current, and interference current of the three-phase arrester and an interference angle of the interference current leading a bus voltage according to a setting position of the three-phase arrester; the phase diagram includes an A-phase bus voltage interference phase diagram and a C-phase bus voltage interference phase diagram; The leakage current characteristic parameter determination module is configured to determine a leakage current characteristic parameter of the three-phase arrester according to the A-phase bus voltage interference phase diagram, a leakage current characteristic of the three-phase arrester, the detection data, and the interference angle, or determine the leakage current characteristic parameter of the three-phase arrester according to the C-phase bus voltage interference phase diagram, the leakage current characteristic of the three-phase arrester, the detection data, and the interference angle; The judgment module is configured to determine an insulation state of the three-phase arrester according to the leakage current characteristic parameter. The leakage current characteristic parameters include an A-phase leakage current resistive component, a B-phase leakage current resistive component, a C-phase leakage current resistive component, an A-phase target leakage current of the A-phase arrester leading an A-phase target interference angle of the A-phase bus voltage, a B-phase target leakage current of the B-phase arrester leading a B-phase target interference angle of the B-phase bus voltage, and a C-phase target leakage current of the C-phase arrester leading a C-phase target interference angle of the C-phase bus voltage. The A-phase leakage current resistive component I A1R is: The B-phase leakage current resistive component I B1R is: The C-phase leakage current resistive component I C1R 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 detection angle, I A1 is the A-phase target leakage current value of the A-phase arrester, I x is the disturbance current value, I b1 wherein I is the B-phase detection angle, I B1 is the B-phase target leakage current value of the B-phase arrester, I c1 wherein I is the C-phase detection angle, I C1 is the C-phase target leakage current value of the C-phase arrester.

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