Method and device for detecting three-phase lightning arrester close to bus

Abstract

The embodiment of the invention discloses a method and a device for detecting a three-phase lightning arrester close to a bus. The method comprises the following steps: acquiring detection data of a three-phase lightning arrester; according to the setting position of the three-phase lightning arrester, determining a phase diagram among 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 leading bus voltage 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; therefore, 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 characteristics 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 are accurately determined according to the C-phase bus voltage interference phase diagram, the leakage current characteristics of the three-phase lightning arrester, the detection data and the interference angle; and accurately determining the insulation state of the three-phase lightning arrester according to the leakage current characteristic parameters.

Description

Technical Field

[0001] The embodiments of the present invention relate to the technical field of power grids, and in particular to a detection method and device for a three-phase lightning arrester adjacent to a busbar. Background Art

[0002] At present, the three-phase arrester in the substation mainly adopts the method of live leakage current testing to measure the leakage current and its resistive component of the three-phase arrester during operation to monitor its insulation state. However, due to the complex electric field environment of the open substation, the three-phase arrester near the bus will be interfered by the coupling of the bus voltage, so that the leakage current of the three-phase arrester will be mixed with the coupling current of the leading bus voltage, thereby interfering with the leakage current detection result of the three-phase arrester, resulting in inaccurate detection data, and thus unable to accurately judge the insulation state of the three-phase arrester. Summary of the invention

[0003] The embodiment of the present invention provides a detection method and device for a three-phase lightning arrester adjacent to a busbar, so as 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, an embodiment of the present invention provides a method for detecting a three-phase lightning arrester adjacent to a bus, the method comprising:

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

[0006] According to the setting position of the three-phase arrester, a phase diagram among the detection leakage current, the target leakage current and the interference current of the three-phase arrester and an interference angle of the interference current of the three-phase arrester leading the bus voltage are determined; the phase diagram includes an A-phase bus voltage interference phase diagram and a C-phase bus voltage interference phase diagram;

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

[0008] The insulation state of the three-phase arrester is determined according to the leakage current characteristic parameter.

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

[0010] If the setting position of the three-phase lightning arrester is close 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 lightning arrester is close to the C-phase bus, the phase diagram is the C-phase bus voltage interference phase diagram.

[0012] Optionally, the step of determining an interference angle at which the interference current of the three-phase arrester leads the interference angle of the three-phase bus voltage comprises:

[0013] If the setting position of the three-phase lightning arrester is close 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 lightning 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 lightning arrester is close 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 lightning arrester leading the bus voltage is determined based on the second leading angle and the C-phase bus voltage interference phase diagram.

[0015] Optionally, determining the leakage current characteristic parameter of the three-phase arrester 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 includes:

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

[0017] Determining a capacitive component equivalent model of the leakage current according to the leakage current characteristics;

[0018] The leakage current characteristic parameters of the three-phase arrester are 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 equal quantity model.

[0019] Optionally, the detection data includes the A-phase detection leakage current value of the A-phase lightning arrester and the A-phase detection angle at which the A-phase detection leakage current leads the A-phase bus voltage, the B-phase detection leakage current value of the B-phase lightning arrester and the B-phase detection angle at which the B-phase detection leakage current leads the B-phase bus voltage, the C-phase detection leakage current value of the C-phase lightning arrester and the C-phase detection angle at which the C-phase detection leakage current leads the C-phase bus voltage;

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

[0021] 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;

[0022] The first leakage current resistive component increase / decrease model includes a first A-phase leakage current resistive component increase / decrease model, a first B-phase leakage current resistive component increase / decrease model, and a first C-phase leakage current resistive component increase / decrease model;

[0023] The leakage current capacitive component equivalent model includes an A-phase and B-phase leakage current capacitive component equivalent model; an A-phase and C-phase leakage current capacitive component equivalent model;

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

[0025] Optionally, the increase and decrease model of the capacitive component of the first A-phase leakage current is:

[0026]

[0027] The increase and decrease model of the capacitive component of the first B phase leakage current is:

[0028]

[0029] The increase and decrease model of the capacitive component of the first C phase leakage current is:

[0030]

[0031] The increase and decrease model of the resistive component of the first phase A leakage current is:

[0032]

[0033] The increase and decrease model of the resistive component of the first B phase leakage current is:

[0034]

[0035] The increase and decrease model of the resistive component of the first C-phase leakage current is:

[0036]

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

[0038]

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

[0040]

[0041] The A phase leakage current resistive component I A1R for:

[0042]

[0043] The B phase leakage current resistive component I B1R for:

[0044]

[0045] The C phase leakage current resistive component I C1R for:

[0046]

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

[0048]

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

[0050]

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

[0052]

[0053] Among them, I a1 The leakage current value of the phase A is detected, is the A phase detection angle, I A1 is the target leakage current value of phase A of the phase A arrester, I x is the interference current value, I b1 Detecting leakage current value for the B phase, is the B phase detection angle, I B1 is the target leakage current value of phase B of the phase B arrester, Ic1 Detecting leakage current value for the C phase, is the C phase detection angle, I C1 is the C-phase target leakage current value of the C-phase arrester.

[0054] Optionally, determining the leakage current characteristic parameter 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 includes:

[0055] Determine a second leakage current capacitive component increase / decrease model and a second leakage current resistive component increase / decrease model of the three-phase arrester according to the C-phase bus voltage interference phase diagram, the detection data and the interference angle;

[0056] Determining a capacitive component equivalent model of the leakage current according to the leakage current characteristics;

[0057] The leakage current characteristic parameters of the three-phase arrester are obtained according to the increase and decrease model of the second leakage current capacitive component, the increase and decrease model of the second leakage current resistive component and the equivalent model of the leakage current capacitive component.

[0058] Optionally, the detection data includes the A-phase detection leakage current value of the A-phase lightning arrester and the A-phase detection angle at which the A-phase detection leakage current leads the A-phase bus voltage, the B-phase detection leakage current value of the B-phase lightning arrester and the B-phase detection angle at which the B-phase detection leakage current leads the B-phase bus voltage, the C-phase detection leakage current value of the C-phase lightning arrester and the C-phase detection angle at which the C-phase detection leakage current leads the C-phase bus voltage;

[0059] The interference angles include the A-phase interference angle of the interference current of the A-phase arrester leading the A-phase voltage bus, the B-phase interference angle of the interference current of the B-phase arrester leading the B-phase voltage bus, and the C-phase interference angle of the interference current of the C-phase arrester leading the C-phase voltage bus;

[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 model includes a second A-phase leakage current resistive component increase / decrease model, a second B-phase leakage current resistive component increase / decrease model, and a second C-phase leakage current resistive component increase / decrease model;

[0062] The leakage current capacitive component equivalent model includes an A-phase and B-phase leakage current capacitive component equivalent model; an A-phase and C-phase leakage current capacitive component equivalent model;

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

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

[0065]

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

[0067]

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

[0069]

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

[0071]

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

[0073]

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

[0075]

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

[0077]

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

[0079]

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

[0081]

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

[0083]

[0084] The B phase leakage current resistive component I B1R for:

[0085]

[0086] The C-phase target interference angle for:

[0087]

[0088] The A-phase target interference angle for:

[0089]

[0090] The B-phase target interference angle for:

[0091]

[0092] Among them, I a1 The leakage current value of the phase A is detected, is the A phase detection angle, I A1 is the target leakage current value of phase A of the phase A arrester, I x is the interference current value, I b1 Detecting leakage current value for the B phase, is the B phase detection angle, I B1 is the target leakage current value of phase B of the phase B arrester, I c1 Detecting leakage current value for the C phase, is the C phase detection 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 invention further provides a detection device for a three-phase lightning arrester adjacent to a busbar, the detection device for a three-phase lightning arrester adjacent to a busbar comprising:

[0094] An acquisition module, used for acquiring detection data of the three-phase arrester;

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

[0096] A leakage current characteristic parameter determination module, used to determine the leakage current characteristic parameters of the three-phase arrester according to the A-phase bus voltage interference phase diagram, the leakage current characteristics of the three-phase arrester, the detection data and the interference angle; or, to determine the leakage current characteristic parameters of the three-phase arrester according to the C-phase bus voltage interference phase diagram, the leakage current characteristics of the three-phase arrester, the detection data and the interference angle;

[0097] The judging module is used to determine the insulation state of the three-phase arrester according to the leakage current characteristic parameter.

[0098] The embodiment of the present invention obtains the detection data of the three-phase arrester; according to the setting position of the three-phase arrester, the detection leakage current of the three-phase arrester, the target leakage current and the phase diagram between the interference current and the interference angle of the interference current of the three-phase arrester leading the bus voltage are determined; the phase diagram includes the A-phase bus voltage interference phase diagram and the C-phase bus voltage interference phase diagram; according to the A-phase bus voltage interference phase diagram, the leakage current characteristics of the three-phase arrester, the detection data and the interference angle, the leakage current characteristic parameters of the three-phase arrester are determined; or, according to the C-phase bus voltage interference phase diagram, the leakage current characteristics of the three-phase arrester, the detection data and the interference angle, the leakage current characteristic parameters of the three-phase arrester are determined; according to the leakage current characteristic parameters, the insulation state of the three-phase arrester is determined. Thus, the leakage current characteristic parameters of the three-phase arrester can be accurately obtained by the above method, and then the insulation state of the three-phase arrester can be accurately determined. BRIEF DESCRIPTION OF THE DRAWINGS

[0099] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0100] Figure 1 A schematic flow chart of a detection method for a three-phase lightning arrester adjacent to a bus provided by an embodiment of the present invention;

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

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

[0103] Figure 4A flow chart of the steps of determining the leakage current characteristic parameters of a three-phase arrester according to an A-phase bus voltage interference phase diagram, the leakage current characteristics of the three-phase arrester, detection data and the interference angle provided by an embodiment of the present invention;

[0104] Figure 5 A flow chart of steps for 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 interference angle provided by an embodiment of the present invention;

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

[0106] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0107] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0108] Figure 1 The present invention provides a flow chart of a detection method for a three-phase lightning arrester adjacent to a busbar. This embodiment is applicable to situations where insulation detection of a three-phase lightning arrester is required. The method can be performed by a detection device for a three-phase lightning arrester adjacent to a busbar. Figure 1 As shown, the method specifically comprises the following steps:

[0109] S110. Obtain detection data of the three-phase lightning arrester.

[0110] The detection data of the three-phase arrester is the leakage current of each phase arrester obtained by conducting a live test on the three-phase arrester and the angle at which the leakage current of each phase arrester leads the bus voltage of the corresponding phase.

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

[0112] S120. According to the setting position of the three-phase arrester, determine the phase diagram between the detection leakage current, target leakage current and interference current of the three-phase arrester and the interference angle of the interference current of the three-phase arrester leading the bus voltage; the phase diagram includes the A-phase bus voltage interference phase diagram and the C-phase bus voltage interference phase diagram.

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

[0114] When the three-phase arrester is close to the A-phase bus, it will be affected by the A-phase bus voltage, generating a coupling current that is 90° ahead of the A-phase voltage, and then being interfered by the coupling current that is 90° ahead of the A-phase voltage; when the three-phase arrester is close to the C-phase bus, it will be affected by the C-phase bus voltage, generating a coupling current that is 90° ahead of the C-phase voltage, and then being interfered by the coupling current that is 90° ahead of the C-phase voltage. It can be seen that the bus phase voltages received by the three-phase arrester are different at the location where the three-phase arrester is set, so that the vector relationship between the detection leakage current, target leakage current and interference current of the three-phase arrester is different. Therefore, it is necessary to determine the phase diagram between the detection leakage current, target leakage current and interference current of the three-phase arrester according to the setting location of the three-phase arrester. The A-phase bus voltage interference phase diagram is a diagram showing the vector relationship between the detected leakage current, target leakage current and interference current when the three-phase lightning arrester is interfered by a coupling current that leads the A-phase voltage by 90°; the C-phase bus voltage interference phase diagram is a diagram showing the vector relationship between the detected leakage current, target leakage current and interference current when the three-phase lightning arrester is interfered by a coupling current that leads the C-phase voltage by 90°.

[0115] For example, Figure 2An A-phase bus voltage interference phase diagram provided by an embodiment of the present invention, Figure 3 A C-phase bus voltage interference phase diagram provided by an embodiment of the present invention. Figure 2 and Figure 3 In the figure, the detection leakage current of the A phase arrester is marked. Target leakage current And interference current The relationship between The detection leakage current of the B phase arrester is marked Target leakage current And interference current The relationship between The detection leakage current of the C phase arrester is marked Target leakage current And interference current The relationship between according to Figure 2 and Figure 3 It can be seen that the detection leakage current of phase A arrester is Target leakage current And interference current With A phase bus voltage U A , B phase bus voltage U B And the C phase bus voltage U C The positional relationship between Figure 2 Each interference current Both are equal to the A-phase bus voltage U A vertical, Figure 3 Each interference current Both are equal to the C phase bus voltage U C vertical. Figure 2 and Figure 3 The target leakage current of phase A of the arrester is Leading A-phase bus voltage U A The A-phase target interference angle is B-phase target leakage current of B-phase arrester Leading A-phase bus voltage U A The B-phase target interference angle is C-phase target leakage current of C-phase arrester Leading A-phase bus voltage U A The C-phase target interference angle is

[0116] In addition, according to the setting position of the three-phase arrester, after confirming the interference object (A-phase bus voltage or C-phase bus voltage) affecting the three-phase arrester, it can be known from the corresponding phase diagram that the interference current of each phase arrester leads the bus voltage of its corresponding phase, thereby confirming the interference angle of the interference current of the three-phase arrester leading the bus voltage. The interference angle includes the angle of the interference current of the A-phase arrester leading the A-phase bus voltage, the angle of the interference current of the B-phase arrester leading the B-phase bus voltage, and the angle of the interference current of the C-phase arrester leading the C-phase bus voltage.

[0117] S130. Determine the leakage current characteristic parameters of the three-phase arrester based on the A-phase bus voltage interference phase diagram, the leakage current characteristics of the three-phase arrester, detection data and interference angle; or determine the leakage current characteristic parameters of the three-phase arrester based on the C-phase bus voltage interference phase diagram, the leakage current characteristics of the three-phase arrester, detection data and interference angle.

[0118] Among them, when the three-phase lightning arrester is close to the A-phase bus, that is, it is interfered by the coupling current that leads the A-phase voltage by 90°, the leakage current characteristic parameters of the three-phase lightning arrester can be determined based on the A-phase bus voltage interference phase diagram, the leakage current characteristics 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, it can be known that the vector sum of the target leakage current and the interference current is equal to the detection leakage current, thereby confirming that the target leakage current, interference current and detection leakage current of each phase of the arrester are all in the vertical direction of the corresponding phase bus voltage. The capacitive component relationship of the leakage current confirms that the target leakage current, interference current and detection leakage current of each phase of the arrester are all in the direction of the corresponding phase bus voltage. The resistive component relationship of the leakage current. Substituting the known quantity detection data and the interference angle into the leakage current capacitive component relationship, the first leakage current capacitive component increase and decrease model can be obtained. Substituting the known quantity detection data and the interference angle into the leakage current resistive component relationship, the first leakage current resistive component increase and decrease model can be obtained.

[0120] Since the arrester model and structure of each phase are the same, it can be known from the leakage current characteristics that the capacitive component of the leakage current of each phase arrester is equal, thereby obtaining a leakage current capacitive component equal model.

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

[0122] In summary, the leakage current characteristic parameters can be obtained by combining and solving the first leakage current capacitive component increase / decrease model, the first leakage current resistive component increase / decrease model and the leakage current capacitive component equal quantity model.

[0123] S140. Determine the insulation state of the three-phase arrester according to the leakage current characteristic parameters.

[0124] Among them, the resistive component of the leakage current is generated by the conduction of the three-phase lightning arrester, which can reflect the insulation performance of the lightning arrester. Therefore, the insulation state of the three-phase lightning arrester can be determined based on the leakage current characteristic parameters.

[0125] The embodiment of the present invention obtains the detection data of the three-phase arrester; according to the setting position of the three-phase arrester, the detection leakage current of the three-phase arrester, the target leakage current and the phase diagram between the interference current and the interference angle of the interference current of the three-phase arrester leading the bus voltage are determined; the phase diagram includes the A-phase bus voltage interference phase diagram and the C-phase bus voltage interference phase diagram; according to the A-phase bus voltage interference phase diagram, the leakage current characteristics of the three-phase arrester, the detection data and the interference angle, the leakage current characteristic parameters of the three-phase arrester are determined; or, according to the C-phase bus voltage interference phase diagram, the leakage current characteristics of the three-phase arrester, the detection data and the interference angle, the leakage current characteristic parameters of the three-phase arrester are determined; according to the leakage current characteristic parameters, the insulation state of the three-phase arrester is determined. Thus, the leakage current characteristic parameters of the three-phase arrester can be accurately obtained by the above method, and then the insulation state of the three-phase arrester can be accurately determined.

[0126] Based on the above embodiment, optionally, the step of determining a phase diagram between a detection leakage current, a target leakage current and an interference current of a three-phase arrester includes:

[0127] If the three-phase arrester is set close to the A-phase bus, the phase diagram will be the A-phase bus voltage interference phase diagram.

[0128] Among them, the three-phase lightning arrester is set close to the A-phase bus and will be interfered by the coupling current that leads the A-phase voltage by 90°. Therefore, it is necessary to adapt the A-phase bus voltage interference phase diagram.

[0129] If the three-phase arrester is set close to the C-phase bus, the phase diagram will be the C-phase bus voltage interference phase diagram.

[0130] Among them, the three-phase lightning arrester is set close to the C-phase bus and will be interfered by the coupling current that leads the C-phase voltage by 90°. Therefore, it is necessary to adapt the C-phase bus voltage interference phase diagram.

[0131] Based on the above embodiment, optionally, the step of determining the interference angle at which the interference current of the three-phase arrester leads the interference angle of the three-phase bus voltage includes:

[0132] If the three-phase arrester is set close 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 leading the bus voltage of the three-phase arrester is determined based on the first leading angle and the A-phase bus voltage interference phase diagram.

[0133] Among them, the interference currents of the A-phase arrester, the B-phase arrester and the C-phase arrester all lead the A-phase bus voltage by a first leading angle of 90°, that is, the interference current of the A-phase arrester is perpendicular to the A-phase bus voltage, the interference current of the B-phase arrester is perpendicular to the A-phase bus voltage, and the interference current of the C-phase arrester is perpendicular to the A-phase bus voltage. According to the positional relationship between the interference currents of the A-phase arrester, the B-phase arrester and the C-phase arrester and the A-phase bus voltage, a geometric analysis of the A-phase bus voltage interference phase diagram is performed, and it can be seen that the interference current of the A-phase arrester leads the A-phase voltage by an interference angle of 90°, the interference current of the B-phase arrester leads the B-phase voltage by an interference angle of 30°, and the interference current of the C-phase arrester leads the C-phase voltage by an interference angle of 30°.

[0134] If the three-phase arrester is set close 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 leading the bus voltage of the three-phase arrester is determined based on the second leading angle and the C-phase bus voltage interference phase diagram.

[0135] Among them, the interference currents of the A-phase arrester, the B-phase arrester and the C-phase arrester all lead the C-phase bus voltage by a first leading angle of 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 positional relationship between the interference currents of the A-phase arrester, the B-phase arrester and the C-phase arrester and the C-phase bus voltage, a geometric analysis of the C-phase bus voltage interference phase diagram is performed, and it can be seen that the interference current of the A-phase arrester leads the C-phase voltage by an interference angle of 30°, the interference current of the B-phase arrester leads the B-phase voltage by an interference angle of 30°, and the interference current of the C-phase arrester leads the C-phase voltage by an interference angle of 90°.

[0136] Based on the above embodiment, optionally, Figure 4 A flow chart of the steps of determining the leakage current characteristic parameters of a three-phase lightning arrester according to the A-phase bus voltage interference phase diagram, the leakage current characteristics of the three-phase lightning arrester, the detection data and the interference angle provided by the embodiment of the present invention. Figure 4 As shown, the steps of determining the leakage current characteristic parameters of the three-phase arrester according to the A-phase bus voltage interference phase diagram, the leakage current characteristics of the three-phase arrester, the detection data and the interference angle are described:

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

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

[0139] Specifically, refer to Figure 2 It can be seen that Interference current With A phase bus voltage U A vertical, from which we can know the target leakage current At phase A bus voltage U A The component on the At phase A bus voltage U A The component on the upper side can reflect the increase or decrease of the resistive component of the leakage current of the A-phase arrester; the target leakage current At phase A bus voltage U A The vertical component plus the interference current At phase A bus voltage U A The component in the vertical direction is equal to the detection leakage current At phase A bus voltage U A The component in the vertical direction can reflect the increase or decrease of the capacitive component of the leakage current of the phase A arrester.

[0140] refer to Figure 2 It can be seen that according to Interference current With A phase bus voltage U A Vertical, A-phase bus voltage U A With B phase bus voltage U B The angle is 120° and other position information, so we can know the interference current of the B phase arrester Leading B phase voltage U B The B phase interference angle is 30°, and the target leakage current At the B phase bus voltage U B The component on the leakage current is detected At the B phase bus voltage U B The difference of the components on the At the B phase bus voltage U B The component on the upper side can reflect the increase or decrease of the resistive component of the leakage current of the B-phase arrester; the target leakage current At the B phase bus voltage U B Vertical component and detection leakage current At the B phase bus voltage U B The component in the vertical direction is equal to the interference current At the B phase bus voltage U B The component in the vertical direction can reflect the increase or decrease of the capacitive component of the leakage current of the B-phase arrester.

[0141] refer to Figure 2 It can be seen that according to Interference current With A phase bus voltage U A Vertical, A-phase bus voltage U A With C phase bus voltage U C The angle is 120° and other position information, so we can know the interference current of the C phase arrester Leading C phase voltage U C The C phase interference angle is 30°, detecting leakage current The C phase bus voltage U C The component on the target leakage current The C phase bus voltage U C The difference of the components on the The C phase bus voltage U CThe component on the upper side can reflect the increase or decrease of the resistive component of the leakage current of the C phase arrester; the target leakage current The C phase bus voltage U C Vertical component and detection leakage current The C phase bus voltage U C The difference in the vertical components is equal to the interference current The C phase bus voltage U C The component on the upper side can reflect the increase or decrease of the capacitive component of the leakage current of the C-phase arrester.

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

[0143] S220. Determine an equivalent model of the capacitive component of the leakage current according to the leakage current characteristics.

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

[0145] S230, obtaining leakage current characteristic parameters of the three-phase arrester 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 equal model.

[0146] Specifically, the first leakage current capacitive component increase / decrease model, the first leakage current resistive component increase / decrease model, and the leakage current capacitive component equal quantity model are combined and solved to obtain the leakage current characteristic parameters.

[0147] Based on the above embodiments, optionally, the detection data includes the A-phase detection leakage current value of the A-phase lightning arrester and the A-phase detection angle at which the A-phase detection leakage current leads the A-phase bus voltage, the B-phase detection leakage current value of the B-phase lightning arrester and the B-phase detection angle at which the B-phase detection leakage current leads the B-phase bus voltage, and the C-phase detection leakage current value of the C-phase lightning arrester and the C-phase detection angle at which the C-phase detection leakage current leads the C-phase bus voltage.

[0148] The interference angle includes the A-phase interference angle that the interference current of the A-phase lightning arrester leads the A-phase voltage bus, the B-phase interference angle that the interference current of the B-phase lightning arrester leads the B-phase voltage bus, and the C-phase interference angle that the interference current of the C-phase lightning arrester leads the C-phase voltage bus.

[0149] Among them, the interference angle of phase A is 90°, the interference angle of phase B is 30°, and the interference angle of phase C is 30°.

[0150] Based on the above embodiment, optionally, 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 increase and decrease model of the capacitive component of the first phase A leakage current is:

[0152]

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

[0154]

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

[0156]

[0157] Among them, I a1 is the leakage current value detected for phase A, is the detection angle of phase A, I A1 is the target leakage current value of phase A of the phase A arrester, I is the A-phase target leakage current value of the A-phase arrester leading the A-phase bus voltage A-phase target angle, x is the interference current value, I b1 is the leakage current value detected for phase B, is the detection angle of phase B, I B1 is the target leakage current value of phase B of the phase B arrester, I is the B-phase target leakage current value of the B-phase arrester leading the B-phase bus voltage. c1 is the leakage current value detected for phase C, is the C phase detection angle, I C1 is the target leakage current value of phase C of the phase C arrester, The C-phase target leakage current value of the C-phase arrester leads the C-phase target angle of the C-phase bus voltage.

[0158] Based on the above embodiment, optionally, the first leakage current resistive component increase / decrease model includes a first A-phase leakage current resistive component increase / decrease model, a first B-phase leakage current resistive component increase / decrease model, and a first C-phase leakage current resistive component increase / decrease model.

[0159] Specifically, the increase and decrease model of the resistive component of the first phase A leakage current is:

[0160]

[0161] The increase and decrease model of the resistive component of the first phase B leakage current is:

[0162]

[0163] The increase and decrease model of the resistive component of the first phase C leakage current is:

[0164]

[0165] Among them, I a1 is the leakage current value detected for phase A, is the detection angle of phase A, I A1 is the target leakage current value of phase A of the phase A arrester, I is the A-phase target leakage current value of the A-phase arrester leading the A-phase bus voltage A-phase target angle, x is the interference current value, I b1 is the leakage current value detected for phase B, is the detection angle of phase B, I B1 is the target leakage current value of phase B of the phase B arrester, I is the B-phase target leakage current value of the B-phase arrester leading the B-phase bus voltage. c1 is the leakage current value detected for phase C, is the C phase detection angle, I C1 is the target leakage current value of phase C of the phase C arrester, The C-phase target leakage current value of the C-phase arrester leads the C-phase target angle of the C-phase bus voltage.

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

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

[0168]

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

[0170]

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

[0172] Based on the above embodiments, optionally, the leakage current characteristic parameters include the resistive component of the A-phase leakage current, the resistive component of the B-phase leakage current, the resistive component of the C-phase leakage current, the A-phase target interference angle of the A-phase target leakage current of the A-phase lightning arrester leading the A-phase bus voltage, the B-phase target interference angle of the B-phase target leakage current of the B-phase lightning arrester leading the B-phase bus voltage, and the C-phase target interference angle of the C-phase target leakage current of the C-phase lightning arrester leading the C-phase bus voltage.

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

[0174] Specifically, the resistive component of the A phase leakage current I A1R for:

[0175]

[0176] The resistive component of the B phase leakage current I B1R for:

[0177]

[0178] C phase leakage current resistive component I C1R for:

[0179]

[0180] Phase A target interference angle for:

[0181]

[0182] Phase B target interference angle for:

[0183]

[0184] C-phase target interference angle for:

[0185]

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

[0187] Based on the above embodiment, optionally, Figure 5 A flow chart of the steps of determining leakage current characteristic parameters according to the C-phase bus voltage interference phase diagram, the leakage current characteristics of the three-phase arrester, the detection data and the interference angle provided by the embodiment of the present invention. Figure 5 As shown, the steps for determining the leakage current characteristic parameters according to the C-phase bus voltage interference phase diagram, the leakage current characteristics of the three-phase arrester, the detection data and the interference angle are described:

[0188] S310, 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 according to the C-phase bus voltage interference phase diagram, detection data, and interference angle.

[0189] Among them, 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 capacitive 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, refer to Figure 3 It can be seen that Interference current With C phase bus voltage U C vertical, from which we can know the target leakage current The C phase bus voltage U C The component on the The C phase bus voltage U C The component on the upper side can reflect the increase or decrease of the resistive component of the leakage current of the C phase arrester; the target leakage current The C phase bus voltage U C The vertical component plus the interference current The C phase bus voltage U C The component in the vertical direction is equal to the detection leakage current The C phase bus voltage U C The component in the vertical direction can reflect the increase or decrease of the capacitive component of the leakage current of the C-phase 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 A phase bus voltage U A The angle is 120° and other position information, so we can know the interference current of the A phase arrester Leading A phase voltage U A The A phase interference angle is 30°, and the target leakage current At phase A bus voltage U A The component on the leakage current is detected At phase A bus voltage U A The difference of the components on the At phase A bus voltage U A The component on the upper side can reflect the increase or decrease of the resistive component of the leakage current of the A-phase arrester; the target leakage current At phase A bus voltage U A Vertical component and detection leakage current At phase A bus voltage U A The component in the vertical direction is equal to the interference current At phase A bus voltage U A The component in the vertical direction can reflect the increase or decrease of the capacitive component of the leakage current of the phase A 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 The angle is 120° and other position information, so we can know the interference current of the B phase arrester Leading B phase voltage U BThe B phase interference angle is 30°, and the leakage current is detected At the B phase bus voltage U B The component on the target leakage current At the B phase bus voltage U B The difference of the components on the At the B phase bus voltage U B The component on the upper side can reflect the increase or decrease of the resistive component of the leakage current of the B-phase arrester; the target leakage current At the B phase bus voltage U B Vertical component and detection leakage current At the B phase bus voltage U B The difference in the vertical components is equal to the interference current At the B phase bus voltage U B The component on the upper side can reflect the increase or decrease of the capacitive component of the leakage current of the B-phase arrester.

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

[0194] S320. Determine a model equivalent to the capacitive component of the leakage current according to the leakage current characteristics.

[0195] Among them, since the model and structure of each phase arrester are the same, according to the leakage current characteristics, it can be known that the capacitive component of the leakage current of each phase arrester is equal, thereby obtaining a leakage current capacitive component equal model.

[0196] S330, obtaining leakage current characteristic parameters of the three-phase arrester 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 equal model.

[0197] Specifically, the second leakage current capacitive component increase / decrease model, the second leakage current resistive component increase / decrease model, and the leakage current capacitive component equal quantity model are combined and solved to obtain the leakage current characteristic parameters.

[0198] On the basis of the above embodiment, optionally, the detection data includes the A-phase detection leakage current value of the A-phase lightning arrester and the A-phase detection angle at which the A-phase detection leakage current leads the A-phase bus voltage, the B-phase detection leakage current value of the B-phase lightning arrester and the B-phase detection angle at which the B-phase detection leakage current leads the B-phase bus voltage, the C-phase detection leakage current value of the C-phase lightning arrester and the C-phase detection angle at which the C-phase detection leakage current leads the C-phase bus voltage;

[0199] The interference angle includes the A-phase interference angle that the interference current of the A-phase lightning arrester leads the A-phase voltage bus, the B-phase interference angle that the interference current of the B-phase lightning arrester leads the B-phase voltage bus, and the C-phase interference angle that the interference current of the C-phase lightning arrester leads the C-phase voltage bus.

[0200] Among them, the interference angle of phase A is 30°, the interference angle of phase B is 30°, and the interference angle of phase C is 90°. Based on the above embodiment, optionally, 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.

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

[0202]

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

[0204]

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

[0206]

[0207] Among them, I a1 is the leakage current value detected for phase A, is the detection angle of phase A, I A1 is the target leakage current value of phase A of the phase A arrester, I is the A-phase target leakage current value of the A-phase arrester leading the A-phase bus voltage A-phase target angle, x is the interference current value, I b1 is the leakage current value detected for phase B, is the detection angle of phase B, I B1 is the target leakage current value of phase B of the phase B arrester, I is the B-phase target leakage current value of the B-phase arrester leading the B-phase bus voltage. c1 is the leakage current value detected for phase C, is the C phase detection angle, I C1is the target leakage current value of phase C of the phase C arrester, The C-phase target leakage current value of the C-phase arrester leads the C-phase target angle of the C-phase bus voltage.

[0208] Based on the above embodiment, optionally, the second leakage current resistive component increase / decrease model includes a second A-phase leakage current resistive component increase / decrease model, a second B-phase leakage current resistive component increase / decrease model, and a second C-phase leakage current resistive component increase / decrease model.

[0209] The increase and decrease model of the resistive component of the second phase C leakage current is:

[0210]

[0211] The increase and decrease model of the resistive component of the second phase A leakage current is:

[0212]

[0213] The increase and decrease model of the resistive component of the second phase B leakage current is:

[0214]

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

[0216] On the basis of the above embodiment, optionally, the equivalent model of the capacitive component of the leakage current includes an equivalent model of the capacitive component of the leakage current of phase A and phase B; and an equivalent model of the capacitive component of the leakage current of phase A and phase C.

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

[0218]

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

[0220]

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

[0222] Based on the above embodiments, optionally, the leakage current characteristic parameters include the resistive component of the A-phase leakage current, the resistive component of the B-phase leakage current, the resistive component of the C-phase leakage current, the A-phase target interference angle of the A-phase target leakage current of the A-phase lightning arrester leading the A-phase bus voltage, the B-phase target interference angle of the B-phase target leakage current of the B-phase lightning arrester leading the B-phase bus voltage, and the C-phase target interference angle of the C-phase target leakage current of the C-phase lightning arrester leading the C-phase bus voltage.

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

[0224]

[0225] A phase leakage current resistive component I A1R for:

[0226]

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

[0228]

[0229] C-phase target interference angle for:

[0230]

[0231] Phase A target interference angle for:

[0232]

[0233] Phase B target interference angle for:

[0234]

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

[0236] Based on the above embodiment, optionally, Figure 6 A schematic diagram of a detection device for a three-phase lightning arrester adjacent to a bus provided by an embodiment of the present invention. Figure 6 As shown, the detection device of the three-phase lightning arrester adjacent to the busbar includes:

[0237] An acquisition module 410 is used to acquire detection data of a three-phase lightning arrester;

[0238] A determination module 420 is used to determine, according to the setting position of the three-phase arrester, a phase diagram between the detection leakage current, the target leakage current and the interference current of the three-phase arrester and an interference angle of the interference current of the three-phase arrester leading the bus voltage; the phase diagram includes an A-phase bus voltage interference phase diagram and a C-phase bus voltage interference phase diagram;

[0239] The leakage current characteristic parameter determination module 430 is used to determine the leakage current characteristic parameters of the three-phase arrester according to the A-phase bus voltage interference phase diagram, the leakage current characteristics of the three-phase arrester, the detection data and the interference angle; or determine the leakage current characteristic parameters of the three-phase arrester according to the C-phase bus voltage interference phase diagram, the leakage current characteristics of the three-phase arrester, the detection data and the interference angle;

[0240] The judgment module 440 is used to determine the insulation state of the three-phase arrester according to the leakage current characteristic parameters.

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

[0242] Based on the above embodiment, optionally, the determination module includes a first phase map matching unit, and the phase map matching unit is specifically used to:

[0243] If the three-phase arrester is set close to the A-phase bus, the phase diagram is the A-phase bus voltage interference phase diagram;

[0244] If the three-phase arrester is set close to the C-phase bus, the phase diagram will be the C-phase bus voltage interference phase diagram.

[0245] Based on the above embodiment, optionally, the determination module includes an interference angle determination unit, and the interference angle determination unit is specifically used to:

[0246] If the three-phase arrester is set close 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 leading the bus voltage of the three-phase arrester is determined based on the first leading angle and the A-phase bus voltage interference phase diagram;

[0247] If the three-phase arrester is set close 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 leading the bus voltage of the three-phase arrester is determined based on the second leading angle and the C-phase bus voltage interference phase diagram.

[0248] On the basis of the above embodiment, the leakage current characteristic parameter determination module includes a first leakage current characteristic parameter determination unit;

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

[0250] Determine the increase and decrease model of the first leakage current capacitive component and the increase and decrease model of the first leakage current resistive component of the three-phase arrester according to the A-phase bus voltage interference phase diagram, the detection data and the interference angle;

[0251] According to the leakage current characteristics, determine the equivalent model of the capacitive component of the leakage current;

[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 equal quantity model, the leakage current characteristic parameters of the three-phase arrester are obtained.

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

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

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

[0256] According to the leakage current characteristics, determine the equivalent model of the capacitive component of the leakage current;

[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 equal quantity model, the leakage current characteristic parameters of the three-phase arrester are obtained.

[0258] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps described in the present invention can be executed in parallel, sequentially or in different orders, as long as the desired results of the technical solution of the present invention can be achieved, and this document does not limit this.

[0259] The above specific implementations do not constitute a limitation on the protection scope of the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A detection method for a three-phase lightning arrester near a busbar, characterized in that: include: Acquiring detection data of the three-phase lightning arrester; According to the setting position of the three-phase arrester, a phase diagram among the detection leakage current, the target leakage current and the interference current of the three-phase arrester and an interference angle of the interference current of the three-phase arrester leading the bus voltage are determined; the phase diagram includes an A-phase bus voltage interference phase diagram and a C-phase bus voltage interference phase diagram; Determine the leakage current characteristic parameters of the three-phase arrester according to the A-phase bus voltage interference phase diagram, the leakage current characteristics of the three-phase arrester, the detection data and the interference angle; or determine the leakage current characteristic parameters of the three-phase arrester according to the C-phase bus voltage interference phase diagram, the leakage current characteristics of the three-phase arrester, the detection data and the interference angle; The insulation state of the three-phase arrester is determined according to the leakage current characteristic parameter.

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

3. The detection method of the three-phase arrester adjacent to the busbar according to claim 2 is characterized in that: The step of determining the interference angle at which the interference current of the three-phase arrester leads the interference angle of the three-phase bus voltage comprises: If the setting position of the three-phase lightning arrester is close 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 lightning 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 lightning arrester is close 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 lightning arrester leading the bus voltage is determined based on the second leading angle and the C-phase bus voltage interference phase diagram.

4. The detection method of a three-phase lightning arrester adjacent to a busbar according to claim 1, characterized in that: Determining the leakage current characteristic parameters of the three-phase arrester 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 includes: Determine a first leakage current capacitive component increase / decrease model and a first leakage current resistive component increase / decrease model of the three-phase arrester according to the A-phase bus voltage interference phase diagram, the detection data and the interference angle; Determining a capacitive component equivalent model of the leakage current according to the leakage current characteristics; The leakage current characteristic parameters of the three-phase arrester are 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 equal quantity model.

5. The detection method of the three-phase lightning arrester adjacent to the busbar according to claim 4 is characterized in that: The detection data includes the A-phase detection leakage current value of the A-phase arrester and the A-phase detection angle at which the A-phase detection leakage current leads the A-phase bus voltage, the B-phase detection leakage current value of the B-phase arrester and the B-phase detection angle at which the B-phase detection leakage current leads the B-phase bus voltage, and the C-phase detection leakage current value of the C-phase arrester and the C-phase detection angle at which the C-phase detection leakage current leads the C-phase bus voltage; The interference angles include the A-phase interference angle of the interference current of the A-phase arrester leading the A-phase voltage bus, the B-phase interference angle of the interference current of the B-phase arrester leading the B-phase voltage bus, and the C-phase interference angle of the interference current of the C-phase arrester leading the C-phase voltage bus; 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; The first leakage current resistive component increase / decrease model includes a first A-phase leakage current resistive component increase / decrease model, a first B-phase leakage current resistive component increase / decrease model, and a first C-phase leakage current resistive component increase / decrease model; The leakage current capacitive component equivalent model includes an A-phase and B-phase leakage current capacitive component equivalent model; an A-phase and C-phase leakage current capacitive component equivalent model; The leakage current characteristic parameters include the resistive component of the A-phase leakage current, the resistive component of the B-phase leakage current, the resistive component of the C-phase leakage current, the A-phase target interference angle of the A-phase lightning arrester's A-phase target leakage current leading the A-phase bus voltage, the B-phase target interference angle of the B-phase lightning arrester's B-phase target leakage current leading the B-phase bus voltage, and the C-phase target interference angle of the C-phase lightning arrester's C-phase target leakage current leading the C-phase bus voltage.

6. The detection method of the three-phase lightning arrester adjacent to the busbar according to claim 5, characterized in that: The increase and decrease model of the capacitive component of the first phase A leakage current is: The increase and decrease model of the capacitive component of the first B phase leakage current is: The increase and decrease model of the capacitive component of the first C phase leakage current is: The increase and decrease model of the resistive component of the first phase A leakage current is: The increase and decrease model of the resistive component of the first B phase leakage current is: The increase and decrease model of the resistive component of the first C-phase leakage current is: The equivalent model of the capacitive component of the A-phase and B-phase leakage current is: The equivalent model of the capacitive component of the A-phase and C-phase leakage current is: The A phase leakage current resistive component I A1R for: The B phase leakage current resistive component I B1R for: The C phase leakage current resistive component I C1R for: The A-phase target interference angle for: The B-phase target interference angle for: The C-phase target interference angle for: Among them, I a1 The leakage current value of the phase A is detected, is the A phase detection angle, I A1 is the target leakage current value of phase A of the phase A arrester, I x is the interference current value, I b1 Detecting leakage current value for the B phase, is the B phase detection angle, I B1 is the target leakage current value of phase B of the phase B arrester, I c1 Detecting leakage current value for the C phase, is the C phase detection angle, I C1 is the C-phase target leakage current value of the C-phase arrester.

7. The detection method of a three-phase lightning arrester adjacent to a busbar according to claim 1, characterized in that: Determining the leakage current characteristic parameter 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 includes: Determine a second leakage current capacitive component increase / decrease model and a second leakage current resistive component increase / decrease model of the three-phase arrester according to the C-phase bus voltage interference phase diagram, the detection data and the interference angle; Determining a capacitive component equivalent model of the leakage current according to the leakage current characteristics; The leakage current characteristic parameters of the three-phase arrester are obtained according to the increase and decrease model of the second leakage current capacitive component, the increase and decrease model of the second leakage current resistive component and the equivalent model of the leakage current capacitive component.

8. The detection method of the three-phase lightning arrester adjacent to the busbar according to claim 7, characterized in that: The detection data includes the A-phase detection leakage current value of the A-phase arrester and the A-phase detection angle at which the A-phase detection leakage current leads the A-phase bus voltage, the B-phase detection leakage current value of the B-phase arrester and the B-phase detection angle at which the B-phase detection leakage current leads the B-phase bus voltage, and the C-phase detection leakage current value of the C-phase arrester and the C-phase detection angle at which the C-phase detection leakage current leads the C-phase bus voltage; The interference angles include the A-phase interference angle of the interference current of the A-phase arrester leading the A-phase voltage bus, the B-phase interference angle of the interference current of the B-phase arrester leading the B-phase voltage bus, and the C-phase interference angle of the interference current of the C-phase arrester leading the C-phase voltage bus; 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; The second leakage current resistive component increase / decrease model includes a second A-phase leakage current resistive component increase / decrease model, a second B-phase leakage current resistive component increase / decrease model, and a second C-phase leakage current resistive component increase / decrease model; The leakage current capacitive component equivalent model includes an A-phase and B-phase leakage current capacitive component equivalent model; an A-phase and C-phase leakage current capacitive component equivalent model; The leakage current characteristic parameters include the resistive component of the A-phase leakage current, the resistive component of the B-phase leakage current, the resistive component of the C-phase leakage current, the A-phase target interference angle of the A-phase lightning arrester's A-phase target leakage current leading the A-phase bus voltage, the B-phase target interference angle of the B-phase lightning arrester's B-phase target leakage current leading the B-phase bus voltage, and the C-phase target interference angle of the C-phase lightning arrester's C-phase target leakage current leading the C-phase bus voltage.

9. The detection method of a three-phase lightning arrester adjacent to a busbar according to claim 8, characterized in that: The increase and decrease model of the capacitive component of the second C phase leakage current is: The increase and decrease model of the capacitive component of the second A phase leakage current is: The increase and decrease model of the capacitive component of the second B phase leakage current is: The increase and decrease model of the resistive component of the second C-phase leakage current is: The increase and decrease model of the resistive component of the second A phase leakage current is: The increase and decrease model of the resistive component of the second B phase leakage current is: The equivalent model of the capacitive component of the A-phase and B-phase leakage current is: The equivalent model of the capacitive component of the A-phase and C-phase leakage current is: The C phase leakage current resistive component I C1R for: The A phase leakage current resistive component I A1R for: The B phase leakage current resistive component I B1R for: The C-phase target interference angle for: The A-phase target interference angle for: The B-phase target interference angle for: Among them, I a1 The leakage current value of the phase A is detected, is the A phase detection angle, I A1 is the target leakage current value of phase A of the phase A arrester, I x is the interference current value, I b1 Detecting leakage current value for the B phase, is the B phase detection angle, I B1 is the target leakage current value of phase B of the phase B arrester, I c1 Detecting leakage current value for the C phase, is the C phase detection angle, I C1 is the C-phase target leakage current value of the C-phase arrester.

10. A detection device for a three-phase lightning arrester near a busbar, characterized in that: include: An acquisition module, used for acquiring detection data of the three-phase arrester; A determination module, for determining, according to the setting position of the three-phase arrester, a phase diagram between the detection leakage current, the target leakage current and the interference current of the three-phase arrester and an interference angle of the interference current of the three-phase arrester leading the bus voltage; the phase diagram includes an A-phase bus voltage interference phase diagram and a C-phase bus voltage interference phase diagram; A leakage current characteristic parameter determination module, used to determine the leakage current characteristic parameters of the three-phase arrester according to the A-phase bus voltage interference phase diagram, the leakage current characteristics of the three-phase arrester, the detection data and the interference angle; or, to determine the leakage current characteristic parameters of the three-phase arrester according to the C-phase bus voltage interference phase diagram, the leakage current characteristics of the three-phase arrester, the detection data and the interference angle; The judging module is used to determine the insulation state of the three-phase arrester according to the leakage current characteristic parameter.

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