Method and device for determining turn-to-turn fault position of iron core reactor

Abstract

The invention discloses a method and device for determining the turn-to-turn fault position of an iron core reactor, and the method comprises the steps: collecting a first magnetic induction intensity set of a to-be-detected iron core reactor through a three-end weak magnetic sensing array, and when the first abnormal magnetic induction intensity exceeding a preset safety threshold value is detected in the first magnetic induction intensity set, determining the position of the to-be-detected iron core reactor; and calling a preset fault detection analysis table to perform data matching with the first magnetic induction intensity set to obtain fault information matched with the first magnetic induction intensity set, and then determining the turn-to-turn position of the fault of the to-be-detected iron core reactor according to the fault information. The three-terminal weak magnetic sensing array is provided with weak magnetic sensors at the top end position, the interphase position and the bottom end position of the to-be-detected iron core reactor, so that the abnormity of the iron core reactor can be effectively captured, the fault information matched with the first magnetic induction intensity set is determined through the fault detection analysis table, a complex troubleshooting process is not needed, and the fault detection efficiency is improved. The accuracy and efficiency of turn-to-turn fault positioning are greatly improved.

Description

Technical Field

[0001] The invention relates to the field of iron core reactor maintenance, and in particular to a method and a device for determining an inter-turn fault position of an iron core reactor. Background Art

[0002] Iron-core reactors play an important role in power systems, but they may experience faults such as turn-to-turn short circuits during operation. Traditional detection methods, such as relying on electrical parameter measurements (including current, voltage, etc.) to diagnose iron-core reactor faults, show low sensitivity when detecting minor faults such as turn-to-turn short circuits. In the early stages of a fault, the changes in electrical parameters may be very small, making it difficult to accurately capture fault signals, which often leads to faults being missed or misjudged.

[0003] Although some conventional partial discharge detection technologies can detect the presence of discharge phenomena, they cannot fully and accurately reflect the complex magnetic field changes inside the iron core reactor, especially in multi-phase reactors. These technologies find it difficult to distinguish the fault characteristics of different phases and different locations, thus limiting the accuracy of fault diagnosis. Summary of the invention

[0004] The present invention provides a method and device for determining the position of an inter-turn fault of an iron core inductor. The method monitors the abnormality of the iron core inductor to be tested in real time through a three-terminal weak magnetic sensor array, and determines the fault information of the iron core inductor to be tested based on a preset fault detection and analysis table. Therefore, there is no need for a complicated troubleshooting process, which greatly improves the accuracy and efficiency of fault location.

[0005] An embodiment of the present invention provides a method for determining a turn-to-turn fault position of an iron core reactor, comprising:

[0006] Acquire a first magnetic induction intensity set of the iron core reactor to be tested collected by a three-terminal weak magnetic sensor array; wherein the three-terminal weak magnetic sensor array is composed of a top weak magnetic sensor monitoring unit, an interphase weak magnetic sensor monitoring unit and a bottom weak magnetic sensor monitoring unit; the interphase weak magnetic sensor monitoring unit is composed of weak magnetic sensors arranged on both sides of each phase in the iron core reactor to be tested; the top weak magnetic sensor monitoring unit is arranged at the top of the iron core reactor to be tested; the bottom weak magnetic sensor monitoring unit is arranged at the bottom of the iron core reactor to be tested;

[0007] When it is detected that there is a first abnormal magnetic induction intensity exceeding a preset safety threshold in the first magnetic induction intensity set, a preset fault detection analysis table is retrieved to perform data matching with the first magnetic induction intensity set to obtain fault information matching the first magnetic induction intensity set; wherein the fault detection analysis table pre-stores the first magnetic induction intensity of each weak magnetic sensor in the three-terminal weak magnetic sensor array at different turn positions of the iron core reactor to be tested when a fault occurred in the past;

[0008] According to the fault information, the turn-to-turn position where the fault occurs in the iron-core reactor to be tested is determined.

[0009] Furthermore, the process of constructing the fault detection analysis table includes:

[0010] Obtaining physical parameters and rated operating parameters of the iron core reactor to be tested;

[0011] Constructing a three-dimensional model of the iron core reactor to be tested according to the physical parameters;

[0012] Mapping the three-dimensional model onto a preset three-dimensional coordinate axis to determine the three-dimensional spatial coordinate information of the iron core reactor to be tested;

[0013] Determine the three-dimensional spatial coordinate information of the three-terminal weak magnetic sensor array with reference to the three-dimensional spatial coordinate information of the iron core reactor to be tested;

[0014] Calculate the second magnetic induction intensity of each weak magnetic sensor in the three-terminal weak magnetic sensor array when the iron core reactor to be tested is in normal operation according to the three-dimensional spatial coordinate information of the iron core reactor to be tested, the three-dimensional spatial coordinate information of the three-terminal weak magnetic sensor array, the physical parameters and the rated operating parameters;

[0015] For each inter-turn position of the iron core reactor to be tested, a fault is simulated at the inter-turn position, and according to the three-dimensional spatial coordinate information of the inter-turn position, the three-dimensional spatial coordinate information of the iron core reactor to be tested, the three-dimensional spatial coordinate information of the three-terminal weak magnetic sensor array, the physical parameters and the rated operating parameters, the third magnetic induction intensity of the position where each weak magnetic sensor is located when the inter-turn position fails is calculated, and the second magnetic induction intensity is superimposed with the third magnetic induction intensity to obtain the first magnetic induction intensity of the position where each weak magnetic sensor is located when the inter-turn position fails;

[0016] A fault detection analysis table is constructed based on the first magnetic induction intensity of the position where each weak magnetic sensor is located when a fault occurs at each inter-turn position.

[0017] Further, the three-dimensional spatial coordinate information of the three-terminal weak magnetic sensor array is determined with reference to the three-dimensional spatial coordinate information of the iron core reactor to be tested, including:

[0018] Determining the spatial topological relationship of the three-terminal weak magnetic field sensor array relative to the iron core reactor to be tested;

[0019] According to the spatial topological relationship, the three-terminal weak magnetic sensor array is mapped onto the three-dimensional coordinate axis with the three-dimensional spatial coordinate information of the iron core reactor to be tested as a reference to obtain the three-dimensional spatial coordinate information of the three-terminal weak magnetic sensor array.

[0020] Further, the physical parameters include a height value of the iron core reactor to be tested, a horizontal distance between phases of the iron core reactor to be tested, and a preset radial spacing of the iron core reactor to be tested;

[0021] The determining of the spatial topological relationship of the three-terminal weak magnetic sensing array relative to the iron core reactor to be tested includes:

[0022] Positioning to the top position of the iron core reactor to be tested;

[0023] According to the top position, determining that the top weak magnetic sensor monitoring unit is located at a first height position in the vertical direction;

[0024] Positioning to the bottom end of the iron core reactor to be tested;

[0025] According to the bottom position, determining that the bottom weak magnetic sensor monitoring unit is located at a second height position in the vertical direction;

[0026] Based on the top position, the bottom position and the height value of the iron core reactor to be tested, positioning to the midpoint position of the iron core reactor to be tested in the vertical direction;

[0027] According to the midpoint position, determining that the interphase weak magnetic field sensor monitoring unit is located at a third height position in the vertical direction;

[0028] According to the horizontal distance between the phases in the iron core reactor to be tested and the preset radial spacing, determine that the top weak magnetic sensor monitoring unit is located at a first horizontal position in the horizontal direction, the bottom weak magnetic sensor monitoring unit is located at a second horizontal position in the horizontal direction, and the inter-phase weak magnetic sensor monitoring unit is located at a third horizontal position in the horizontal direction;

[0029] Determine, according to the first height position and the first horizontal position, a spatial topological relationship of the top weak magnetic sensor monitoring unit relative to the iron core reactor to be tested;

[0030] Determine the spatial topological relationship of the bottom weak magnetic sensor monitoring unit relative to the iron core reactor to be tested according to the second height position and the second horizontal position;

[0031] Determine, according to the third height position and the third horizontal position, a spatial topological relationship of the phase-to-phase weak magnetic sensor monitoring unit relative to the iron core reactor to be tested;

[0032] According to the spatial topological relationship of the top weak magnetic sensor monitoring unit relative to the iron core inductor to be tested, the spatial topological relationship of the bottom weak magnetic sensor monitoring unit relative to the iron core inductor to be tested, and the spatial topological relationship of the interphase weak magnetic sensor monitoring unit relative to the iron core inductor to be tested, the spatial topological relationship of the three-terminal weak magnetic sensor array relative to the iron core inductor to be tested is determined.

[0033] Furthermore, the method for determining the position of an inter-turn fault of an iron core reactor further includes:

[0034] Acquire a second magnetic induction intensity set of the iron core reactor to be tested collected by the interphase weak magnetic sensor monitoring unit;

[0035] When it is determined that there is a second abnormal magnetic induction intensity exceeding a preset safety threshold in the second magnetic induction intensity set, determining a target weak magnetic sensor to which the second abnormal magnetic induction intensity belongs;

[0036] The fault phase of the iron-core reactor to be tested is determined according to the spatial topological relationship of the target weak magnetic sensor relative to the iron-core reactor to be tested.

[0037] An embodiment of the present invention further provides a device for determining a turn-to-turn fault position of an iron core reactor, comprising:

[0038] A first magnetic induction intensity set acquisition module, a fault information determination module and a turn-to-turn position determination module;

[0039] The first magnetic induction intensity set acquisition module is used to acquire the first magnetic induction intensity set of the iron core reactor to be tested collected by the three-terminal weak magnetic sensor array; wherein the three-terminal weak magnetic sensor array is composed of a top weak magnetic sensor monitoring unit, an interphase weak magnetic sensor monitoring unit and a bottom weak magnetic sensor monitoring unit; the interphase weak magnetic sensor monitoring unit is composed of weak magnetic sensors arranged on both sides of each phase in the iron core reactor to be tested; the top weak magnetic sensor monitoring unit is arranged at the top of the iron core reactor to be tested; the bottom weak magnetic sensor monitoring unit is arranged at the bottom of the iron core reactor to be tested;

[0040] The fault information determination module is used to retrieve a preset fault detection analysis table to perform data matching with the first magnetic induction intensity set when detecting that there is a first abnormal magnetic induction intensity exceeding a preset safety threshold in the first magnetic induction intensity set, so as to obtain fault information matching the first magnetic induction intensity set; wherein the fault detection analysis table pre-stores the first magnetic induction intensity of each weak magnetic sensor in the three-terminal weak magnetic sensor array at different turn positions of the iron core reactor to be tested when a fault occurred in the past;

[0041] The turn-to-turn position determination module is used to determine the turn-to-turn position where the fault occurs in the iron-core reactor to be tested according to the fault information.

[0042] Furthermore, the process of constructing the fault detection analysis table includes:

[0043] Obtaining physical parameters and rated operating parameters of the iron core reactor to be tested;

[0044] Constructing a three-dimensional model of the iron core reactor to be tested according to the physical parameters;

[0045] Mapping the three-dimensional model onto a preset three-dimensional coordinate axis to determine the three-dimensional spatial coordinate information of the iron core reactor to be tested;

[0046] Determine the three-dimensional spatial coordinate information of the three-terminal weak magnetic sensor array with reference to the three-dimensional spatial coordinate information of the iron core reactor to be tested;

[0047] Calculate the second magnetic induction intensity of each weak magnetic sensor in the three-terminal weak magnetic sensor array when the iron core reactor to be tested is in normal operation according to the three-dimensional spatial coordinate information of the iron core reactor to be tested, the three-dimensional spatial coordinate information of the three-terminal weak magnetic sensor array, the physical parameters and the rated operating parameters;

[0048] For each inter-turn position of the iron core reactor to be tested, a fault is simulated at the inter-turn position, and according to the three-dimensional spatial coordinate information of the inter-turn position, the three-dimensional spatial coordinate information of the iron core reactor to be tested, the three-dimensional spatial coordinate information of the three-terminal weak magnetic sensor array, the physical parameters and the rated operating parameters, the third magnetic induction intensity of the position where each weak magnetic sensor is located when the inter-turn position fails is calculated, and the second magnetic induction intensity is superimposed with the third magnetic induction intensity to obtain the first magnetic induction intensity of the position where each weak magnetic sensor is located when the inter-turn position fails;

[0049] A fault detection analysis table is constructed based on the first magnetic induction intensity of the position where each weak magnetic sensor is located when a fault occurs at each inter-turn position.

[0050] Further, the three-dimensional spatial coordinate information of the three-terminal weak magnetic sensor array is determined with reference to the three-dimensional spatial coordinate information of the iron core reactor to be tested, including:

[0051] Determining the spatial topological relationship of the three-terminal weak magnetic field sensor array relative to the iron core reactor to be tested;

[0052] According to the spatial topological relationship, the three-terminal weak magnetic sensor array is mapped onto the three-dimensional coordinate axis with the three-dimensional spatial coordinate information of the iron core reactor to be tested as a reference to obtain the three-dimensional spatial coordinate information of the three-terminal weak magnetic sensor array.

[0053] Further, the physical parameters include a height value of the iron core reactor to be tested, a horizontal distance between phases of the iron core reactor to be tested, and a preset radial spacing of the iron core reactor to be tested;

[0054] The determining of the spatial topological relationship of the three-terminal weak magnetic sensing array relative to the iron core reactor to be tested includes:

[0055] Positioning to the top position of the iron core reactor to be tested;

[0056] According to the top position, determining that the top weak magnetic sensor monitoring unit is located at a first height position in the vertical direction;

[0057] Positioning to the bottom end of the iron core reactor to be tested;

[0058] According to the bottom position, determining that the bottom weak magnetic sensor monitoring unit is located at a second height position in the vertical direction;

[0059] Based on the top position, the bottom position and the height value of the iron core reactor to be tested, positioning to the midpoint position of the iron core reactor to be tested in the vertical direction;

[0060] According to the midpoint position, determining that the interphase weak magnetic field sensor monitoring unit is located at a third height position in the vertical direction;

[0061] According to the horizontal distance between the phases in the iron core reactor to be tested and the preset radial spacing, determine that the top weak magnetic sensor monitoring unit is located at a first horizontal position in the horizontal direction, the bottom weak magnetic sensor monitoring unit is located at a second horizontal position in the horizontal direction, and the inter-phase weak magnetic sensor monitoring unit is located at a third horizontal position in the horizontal direction;

[0062] Determine, according to the first height position and the first horizontal position, a spatial topological relationship of the top weak magnetic sensor monitoring unit relative to the iron core reactor to be tested;

[0063] Determine the spatial topological relationship of the bottom weak magnetic sensor monitoring unit relative to the iron core reactor to be tested according to the second height position and the second horizontal position;

[0064] Determine, according to the third height position and the third horizontal position, a spatial topological relationship of the phase-to-phase weak magnetic sensor monitoring unit relative to the iron core reactor to be tested;

[0065] According to the spatial topological relationship of the top weak magnetic sensor monitoring unit relative to the iron core inductor to be tested, the spatial topological relationship of the bottom weak magnetic sensor monitoring unit relative to the iron core inductor to be tested, and the spatial topological relationship of the interphase weak magnetic sensor monitoring unit relative to the iron core inductor to be tested, the spatial topological relationship of the three-terminal weak magnetic sensor array relative to the iron core inductor to be tested is determined.

[0066] Furthermore, the device for determining the position of an inter-turn fault of an iron core reactor further comprises: a fault phase determination module;

[0067] The fault phase determination module is used to obtain the second magnetic induction intensity set of the iron core reactor to be tested collected by the interphase weak magnetic sensor monitoring unit;

[0068] When it is determined that there is a second abnormal magnetic induction intensity exceeding a preset safety threshold in the second magnetic induction intensity set, determining a target weak magnetic sensor to which the second abnormal magnetic induction intensity belongs;

[0069] The fault phase of the iron-core reactor to be tested is determined according to the spatial topological relationship of the target weak magnetic sensor relative to the iron-core reactor to be tested.

[0070] The following beneficial effects are achieved by implementing the present invention:

[0071] The present invention provides a method and device for determining the position of an inter-turn fault of an iron core reactor. The method sets a top weak magnetic sensor monitoring unit at the top position of the iron core reactor to be tested, sets an interphase weak magnetic sensor monitoring unit at the interphase position of the iron core reactor to be tested, and sets a bottom weak magnetic sensor monitoring unit at the bottom position of the iron core reactor to be tested. Therefore, the three-terminal weak magnetic sensor array formed by the method can effectively capture abnormal information when monitoring the magnetic field distribution of the iron core reactor, and provide comprehensive data support for fault diagnosis.

[0072] Then, the historical fault data pre-stored in the fault detection analysis table is matched with the first magnetic induction intensity set of the iron core inductor to be tested collected by the three-terminal weak magnetic sensor array, so as to obtain fault information matching the first magnetic induction intensity set in the fault detection analysis table, and determine the inter-turn position where the fault occurs based on the fault information. As a result, there is no need for a complicated troubleshooting process, which greatly improves the accuracy and efficiency of fault locating. The detection method based on weak magnetic sensing is a non-invasive detection, which will not interfere with the normal operation of the iron core inductor. In addition, the installation and data collection of the sensor are relatively convenient, and it is easy to promote and apply in existing power system equipment, reducing the difficulty and cost of equipment maintenance and detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0073] In order to more clearly illustrate the technical solution of the present application, the drawings required for use in the implementation manner will be briefly introduced below. Obviously, the drawings described below are only some implementation manners of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0074] Figure 1 It is a flow chart of a method for determining the position of an inter-turn fault of an iron core reactor provided in a certain embodiment of the present application;

[0075] Figure 2 is a structural schematic diagram of an iron core reactor to be tested provided in a certain embodiment of the present application;

[0076] Figure 3 is a structural schematic diagram of an iron core reactor to be tested provided by another embodiment of the present application;

[0077] Figure 4 It is a structural schematic diagram of a device for determining an inter-turn fault position of an iron core reactor provided in a certain embodiment of the present application;

[0078] Figure 5 It is a structural schematic diagram of a device for determining an inter-turn fault location of an iron core reactor provided in another embodiment of the present application. DETAILED DESCRIPTION

[0079] In order to make the purpose, technical solutions and advantages of this application clearer, the technical solutions in this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0080] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0081] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0082] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0083] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0084] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0085] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0086] See also Figure 1 , is a flow chart of a method for determining the location of an inter-turn fault of an iron core reactor provided by an embodiment of the present invention, comprising:

[0087] S1. Obtain the first magnetic induction intensity set of the iron core reactor to be tested collected by the three-terminal weak magnetic sensor array; wherein the three-terminal weak magnetic sensor array is composed of a top weak magnetic sensor monitoring unit, an interphase weak magnetic sensor monitoring unit and a bottom weak magnetic sensor monitoring unit; the interphase weak magnetic sensor monitoring unit is composed of weak magnetic sensors arranged on both sides of each phase in the iron core reactor to be tested; the top weak magnetic sensor monitoring unit is arranged at the top of the iron core reactor to be tested; the bottom weak magnetic sensor monitoring unit is arranged at the bottom of the iron core reactor to be tested;

[0088] In a preferred embodiment, the physical parameters include a height value of the iron core reactor to be tested, a horizontal distance between phases of the iron core reactor to be tested, and a preset radial spacing of the iron core reactor to be tested;

[0089] The determining of the spatial topological relationship of the three-terminal weak magnetic sensing array relative to the iron core reactor to be tested includes:

[0090] Positioning to the top position of the iron core reactor to be tested;

[0091] According to the top position, determining that the top weak magnetic sensor monitoring unit is located at a first height position in the vertical direction;

[0092] Positioning to the bottom end of the iron core reactor to be tested;

[0093] According to the bottom position, determining that the bottom weak magnetic sensor monitoring unit is located at a second height position in the vertical direction;

[0094] Based on the top position, the bottom position and the height value of the iron core reactor to be tested, positioning to the midpoint position of the iron core reactor to be tested in the vertical direction;

[0095] According to the midpoint position, determining that the interphase weak magnetic field sensor monitoring unit is located at a third height position in the vertical direction;

[0096] According to the horizontal distance between the phases in the iron core reactor to be tested and the preset radial spacing, determine that the top weak magnetic sensor monitoring unit is located at a first horizontal position in the horizontal direction, the bottom weak magnetic sensor monitoring unit is located at a second horizontal position in the horizontal direction, and the inter-phase weak magnetic sensor monitoring unit is located at a third horizontal position in the horizontal direction;

[0097] Determine, according to the first height position and the first horizontal position, a spatial topological relationship of the top weak magnetic sensor monitoring unit relative to the iron core reactor to be tested;

[0098] Determine the spatial topological relationship of the bottom weak magnetic sensor monitoring unit relative to the iron core reactor to be tested according to the second height position and the second horizontal position;

[0099] Determine, according to the third height position and the third horizontal position, a spatial topological relationship of the phase-to-phase weak magnetic sensor monitoring unit relative to the iron core reactor to be tested;

[0100] Determine the spatial topological relationship of the three-terminal weak magnetic sensor array relative to the iron core reactor to be tested according to the spatial topological relationship of the top weak magnetic sensor monitoring unit relative to the iron core reactor to be tested, the spatial topological relationship of the bottom weak magnetic sensor monitoring unit relative to the iron core reactor to be tested, and the spatial topological relationship of the interphase weak magnetic sensor monitoring unit relative to the iron core reactor to be tested;

[0101] Indicatively, see Figure 2 , the iron core reactor to be tested includes phase A, phase B and phase C;

[0102] Specifically, the top weak magnetic sensor monitoring unit is composed of a weak magnetic sensor H1, a weak magnetic sensor H3 and a weak magnetic sensor H5; the interphase weak magnetic sensor monitoring unit is composed of a weak magnetic sensor D1, a weak magnetic sensor D2, a weak magnetic sensor D3 and a weak magnetic sensor D4; the bottom weak magnetic sensor monitoring unit is composed of a weak magnetic sensor H2, a weak magnetic sensor H4 and a weak magnetic sensor H6.

[0103] In order to enable the three-terminal weak magnetic sensor array to more accurately monitor the change of the inter-turn magnetic induction intensity of the iron core reactor to be tested, it is necessary to determine the spatial topological relationship of the three-terminal weak magnetic sensor array relative to the iron core reactor to be tested;

[0104] Specifically, the height value H of the iron core reactor to be tested, the horizontal distance D between the phases of the iron core reactor to be tested, and the model parameters of the iron core reactor to be tested are obtained, and then according to the model parameters of the iron core reactor to be tested, the preset radial spacing y of the iron core reactor to be tested is determined in a preset distributed weak magnetic sensor array installation distance reference table;

[0105] It should be noted that see Figure 2, taking the weak magnetic sensors in the top weak magnetic sensor monitoring unit as an example, the weak magnetic sensors H1, H3 and H5 cannot be directly placed close to the front end of the iron core reactor to be tested, but need to maintain a certain safety distance from the front end of the iron core reactor to be tested, and how much the safety distance should be set depends on the model parameters of the iron core reactor to be tested; that is, according to the model parameters of the iron core reactor to be tested, the preset radial spacing y of the iron core reactor to be tested is determined, and according to the preset radial spacing y, the safety distance that should be maintained between the three-terminal weak magnetic sensor array and the front end of the iron core reactor to be tested is determined;

[0106] Specifically, when the model parameter (system voltage level) of the iron core reactor to be tested is 3kV and below, the preset radial spacing y is 12cm; when the model parameter (system voltage level) of the iron core reactor to be tested is 6kV, the preset radial spacing y is 13cm; when the model parameter (system voltage level) of the iron core reactor to be tested is 10kV, the preset radial spacing y is 15cm; when the model parameter (system voltage level) of the iron core reactor to be tested is 35kV, the preset radial spacing y is 18cm;

[0107] For the top weak magnetic sensor monitoring unit, after determining the preset radial spacing y, the horizontal distances among the weak magnetic sensor H1, the weak magnetic sensor H3 and the weak magnetic sensor H5 are determined according to the horizontal distance D between the phases in the iron core reactor to be tested, and then the horizontal positions of the weak magnetic sensor H1, the weak magnetic sensor H3 and the weak magnetic sensor H5 in the horizontal direction are determined respectively in combination with the preset radial spacing y, that is, the first horizontal position of the top weak magnetic sensor monitoring unit in the horizontal direction is obtained; then, it is necessary to locate to the top position of the iron core reactor to be tested, and determine the height positions of the weak magnetic sensor H1, the weak magnetic sensor H3 and the weak magnetic sensor H5 in the vertical direction (that is, aligned with the top of the iron core reactor to be tested), that is, the first height position of the top weak magnetic sensor monitoring unit in the vertical direction is obtained; finally, according to the first height position and the first horizontal position, the spatial topological relationship of the top weak magnetic sensor monitoring unit relative to the iron core reactor to be tested is determined;

[0108] Similarly, for the bottom weak magnetic sensor monitoring unit, after determining the preset radial spacing y, the horizontal distances between the weak magnetic sensor H2, the weak magnetic sensor H4 and the weak magnetic sensor H6 are determined according to the horizontal distance D between the phases in the iron core reactor to be tested, and then the horizontal positions of the weak magnetic sensor H2, the weak magnetic sensor H4 and the weak magnetic sensor H6 in the horizontal direction are determined respectively in combination with the preset radial spacing y, that is, the second horizontal position of the bottom weak magnetic sensor monitoring unit in the horizontal direction is obtained; then, it is necessary to locate to the bottom position of the iron core reactor to be tested, and determine the height positions of the weak magnetic sensor H2, the weak magnetic sensor H4 and the weak magnetic sensor H6 in the vertical direction (that is, aligned with the bottom end of the iron core reactor to be tested), that is, the second height position of the bottom weak magnetic sensor monitoring unit in the vertical direction is obtained; finally, according to the second height position and the second horizontal position, the spatial topological relationship of the bottom weak magnetic sensor monitoring unit relative to the iron core reactor to be tested is determined;

[0109] Similarly, for the phase-to-phase weak magnetic sensor monitoring unit, after determining the preset radial spacing y, the horizontal distances between the weak magnetic sensor D1, the weak magnetic sensor D2, the weak magnetic sensor D3 and the weak magnetic sensor D4 are determined according to the horizontal distance D between the phases in the iron core reactor to be tested, and then the horizontal positions of the weak magnetic sensor D1, the weak magnetic sensor D2, the weak magnetic sensor D3 and the weak magnetic sensor D4 in the horizontal direction are determined respectively in combination with the preset radial spacing y, that is, the third horizontal position of the phase-to-phase weak magnetic sensor monitoring unit in the horizontal direction is obtained; then, the bottom end position of the iron core reactor to be tested is positioned, and the H / 2 height point of the iron core reactor to be tested is determined with the bottom end position as the height starting point, and the H / 2 height point is determined as the third height position of the phase-to-phase weak magnetic sensor monitoring unit; finally, the spatial topological relationship of the phase-to-phase weak magnetic sensor monitoring unit relative to the iron core reactor to be tested is determined according to the third height position and the third horizontal position;

[0110] According to the spatial topological relationship of the top weak magnetic sensor monitoring unit relative to the iron core inductor to be tested, the spatial topological relationship of the bottom weak magnetic sensor monitoring unit relative to the iron core inductor to be tested, and the spatial topological relationship of the inter-phase weak magnetic sensor monitoring unit relative to the iron core inductor to be tested, the spatial topological structure of the three-terminal weak magnetic sensor array relative to the iron core inductor to be tested is determined.

[0111] S2. When it is detected that there is a first abnormal magnetic induction intensity exceeding a preset safety threshold in the first magnetic induction intensity set, a preset fault detection analysis table is retrieved to perform data matching with the first magnetic induction intensity set to obtain fault information matching the first magnetic induction intensity set; wherein the fault detection analysis table pre-stores the first magnetic induction intensity of each weak magnetic sensor in the three-terminal weak magnetic sensor array at different turn positions of the iron core reactor to be tested when a fault occurred in the past;

[0112] Schematically, when constructing the fault detection analysis table, it is necessary to first simulate the fault of the iron core inductor to be tested at different inter-turn positions, and then collect the first magnetic induction intensity corresponding to each weak magnetic sensor in the three-terminal weak magnetic sensor array under the simulated fault scenario, so as to construct the table.

[0113] In a preferred embodiment, the process of constructing the fault detection analysis table includes:

[0114] Obtaining physical parameters and rated operating parameters of the iron core reactor to be tested;

[0115] Constructing a three-dimensional model of the iron core reactor to be tested according to the physical parameters;

[0116] Mapping the three-dimensional model onto a preset three-dimensional coordinate axis to determine the three-dimensional spatial coordinate information of the iron core reactor to be tested;

[0117] Determine the three-dimensional spatial coordinate information of the three-terminal weak magnetic sensor array with reference to the three-dimensional spatial coordinate information of the iron core reactor to be tested;

[0118] Calculate the second magnetic induction intensity of each weak magnetic sensor in the three-terminal weak magnetic sensor array when the iron core reactor to be tested is in normal operation according to the three-dimensional spatial coordinate information of the iron core reactor to be tested, the three-dimensional spatial coordinate information of the three-terminal weak magnetic sensor array, the physical parameters and the rated operating parameters;

[0119] For each inter-turn position of the iron core reactor to be tested, a fault is simulated at the inter-turn position, and according to the three-dimensional spatial coordinate information of the inter-turn position, the three-dimensional spatial coordinate information of the iron core reactor to be tested, the three-dimensional spatial coordinate information of the three-terminal weak magnetic sensor array, the physical parameters and the rated operating parameters, the third magnetic induction intensity of the position where each weak magnetic sensor is located when the inter-turn position fails is calculated, and the second magnetic induction intensity is superimposed with the third magnetic induction intensity to obtain the first magnetic induction intensity of the position where each weak magnetic sensor is located when the inter-turn position fails;

[0120] A fault detection analysis table is constructed based on the first magnetic induction intensity of the position where each weak magnetic sensor is located when a fault occurs at each inter-turn position.

[0121] Specifically, the physical parameters of the iron core reactor to be tested include the reactance value of each phase, the inductance value of each phase, the length L of each phase iron core coil, the radius a of each turn of the coil, the height value H of the iron core reactor to be tested, the horizontal distance D between the phases of the iron core reactor to be tested, and the preset radial spacing y of the iron core reactor to be tested; the rated operating parameters include the rated voltage value and the rated current value I;

[0122] Specifically, in order to better calculate the first magnetic induction intensity of each weak magnetic sensor at each turn-to-turn position when a fault occurs, it is necessary to first construct a three-dimensional model of the iron core reactor to be tested according to the physical parameters, and map the three-dimensional model to a preset three-dimensional coordinate axis to determine the three-dimensional spatial coordinate information of the iron core reactor to be tested;

[0123] It should be noted that the origin of the three-dimensional coordinate axis is located at the midpoint of the front end of the bottom of the phase B of the iron core reactor to be tested in the three-dimensional model.

[0124] Indicatively, after determining the three-dimensional spatial coordinate information of the iron core reactor to be tested, the three-dimensional spatial coordinate information of the three-terminal weak magnetic sensor array is determined with reference to the three-dimensional spatial coordinate information of the iron core reactor to be tested;

[0125] In a preferred embodiment, the three-dimensional spatial coordinate information of the three-terminal weak magnetic sensor array is determined with reference to the three-dimensional spatial coordinate information of the iron core reactor to be tested, including:

[0126] Determining the spatial topological relationship of the three-terminal weak magnetic field sensor array relative to the iron core reactor to be tested;

[0127] According to the spatial topological relationship, the three-dimensional spatial coordinate information of the iron core reactor to be tested is used as a reference, and the three-terminal weak magnetic sensor array is mapped onto the three-dimensional coordinate axis to obtain the three-dimensional spatial coordinate information of the three-terminal weak magnetic sensor array;

[0128] Specifically, the three-dimensional spatial coordinate information of the iron core inductor to be tested is used as a reference, and the three-terminal weak magnetic sensor array is mapped onto the three-dimensional coordinate axis through the aforementioned determined spatial topological structure of the three-terminal weak magnetic sensor array relative to the iron core inductor to obtain the three-dimensional spatial coordinate information of the three-terminal weak magnetic sensor array.

[0129] Calculate the second magnetic induction intensity of each weak magnetic sensor in the three-terminal weak magnetic sensor array when the iron core reactor to be tested is in normal operation according to the three-dimensional spatial coordinate information of the iron core reactor to be tested, the three-dimensional spatial coordinate information of the three-terminal weak magnetic sensor array, the physical parameters and the rated operating parameters;

[0130] Specifically, see Figure 3 , the second magnetic induction intensity of each weak magnetic sensor in the three-terminal weak magnetic sensor array when the iron core reactor to be tested is in normal operation is calculated by the following formula:

[0131]

[0132] In the formula, a is the radius of each turn of the coil; μ0 is the vacuum magnetic permeability; L is the length of the core coil of each phase; I is the rated current of phase B; x and z are the three-dimensional spatial coordinates of the weak magnetic sensor; and y is the radial installation spacing.

[0133] For each inter-turn position of the iron core reactor to be tested, a fault is simulated at the inter-turn position, and according to the three-dimensional spatial coordinate information of the inter-turn position, the three-dimensional spatial coordinate information of the iron core reactor to be tested, the three-dimensional spatial coordinate information of the three-terminal weak magnetic sensor array, the physical parameters and the rated operating parameters, the third magnetic induction intensity of the position where each weak magnetic sensor is located when the inter-turn position fails is calculated, and the second magnetic induction intensity is superimposed with the third magnetic induction intensity to obtain the first magnetic induction intensity of the position where each weak magnetic sensor is located when the inter-turn position fails;

[0134] Specifically, when a turn insulation defect occurs in a phase of the iron core reactor, the fault location can be equivalent to a short-circuit current ring; the third magnetic induction intensity of each weak magnetic sensor at the position where the fault occurs between the turns is calculated by the following method:

[0135]

[0136] Where a is the conductor cross-sectional radius; μ 0 is the vacuum magnetic permeability; I is the rated current of phase B; x and z are the three-dimensional spatial coordinates of the weak magnetic sensor.

[0137] After calculating the second magnetic induction intensity and the third magnetic induction intensity at the position of each weak magnetic sensor when a fault occurs at each inter-turn position, the second magnetic induction intensity and the third magnetic induction intensity are superimposed to obtain the first magnetic induction intensity at the position of each weak magnetic sensor when a fault occurs at the inter-turn position; and constructing a fault detection analysis table based on the first magnetic induction intensity at the position of each weak magnetic sensor when a fault occurs at each inter-turn position.

[0138] Specifically, the present application adopts an iron core reactor with a voltage level of 10 kV, a rated current value of 252 A, a reactor coil height H of 79 cm, an outer diameter D of 47 cm, and an inner diameter a of 34 cm for fault experiments. The experimental results are as follows:

[0139] As shown in Table 1:

[0140]

[0141] Table 1

[0142] It should be noted that in actual experiments, the step length can be set according to the actual accuracy requirements. Each time a fault simulation experiment is performed, a step length is moved accordingly to simulate the occurrence of a fault. Table 1 provided in this application is only for illustration;

[0143] Specifically, when it is detected that the first magnetic induction intensity set of the iron core reactor to be tested collected by the three-terminal weak magnetic sensor array contains a first abnormal magnetic induction intensity exceeding a preset safety threshold, the fault detection analysis table is retrieved to perform data matching with the first magnetic induction intensity set;

[0144] The closer the weak magnetic sensor is to the fault point, the greater the change in its corresponding first magnetic induction intensity will be. For example, when a turn insulation defect fault occurs in phase A, the first magnetic induction intensity at D1, D2, H1, and H2 will increase significantly, while the first magnetic induction intensity at the far end D3, D4, H5, and H6 will be almost unaffected. Furthermore, the data combination composed of the first magnetic induction intensity of each weak magnetic sensor when a fault occurs at each turn position of each phase in the fault detection and analysis table is matched with the first magnetic induction intensity set collected in real time to find the closest set of data combinations, so that the position information corresponding to the data combination is used as the fault information matched by the first magnetic induction intensity set.

[0145] S3. Determine the inter-turn position where the fault occurs in the iron core reactor to be tested according to the fault information;

[0146] Specifically, after the fault information is determined, it means that the turn-to-turn position where the fault occurs in the iron-core reactor to be tested is also determined.

[0147] In a preferred embodiment, the method for determining the position of an inter-turn fault of an iron core reactor further includes:

[0148] Acquire a second magnetic induction intensity set of the iron core reactor to be tested collected by the interphase weak magnetic sensor monitoring unit;

[0149] When it is determined that there is a second abnormal magnetic induction intensity exceeding a preset safety threshold in the second magnetic induction intensity set, determining a target weak magnetic sensor to which the second abnormal magnetic induction intensity belongs;

[0150] Determining the fault phase of the iron-core reactor to be tested according to the spatial topological relationship of the target weak magnetic sensor relative to the iron-core reactor to be tested;

[0151] Specifically, in the scenario where only the fault phase needs to be known, the closer the weak magnetic sensor is to the fault point, the greater the change in the corresponding first magnetic induction intensity will be. For example, when a turn insulation defect fault occurs in phase A, the first magnetic induction intensity at D1 and D2 will increase significantly, while the first magnetic induction intensity at the far end D3 and D4 will be almost unaffected. For another example, when a turn insulation defect fault occurs in phase B, the first magnetic induction intensity at D2 and D3 will increase significantly, while the first magnetic induction intensity at the far end D1 and D4 will be almost unaffected. Therefore, the second magnetic induction intensity set collected by the phase-to-phase weak magnetic sensor monitoring unit can be used to determine which phase has failed, thereby eliminating the step of looking up the table.

[0152] See also Figure 2 , is a device for determining the position of an inter-turn fault of an iron core reactor provided by an embodiment of the present invention, comprising: a first magnetic induction intensity set acquisition module, a fault information determination module and an inter-turn position determination module;

[0153] The first magnetic induction intensity set acquisition module is used to acquire the first magnetic induction intensity set of the iron core reactor to be tested collected by the three-terminal weak magnetic sensor array; wherein the three-terminal weak magnetic sensor array is composed of a top weak magnetic sensor monitoring unit, an interphase weak magnetic sensor monitoring unit and a bottom weak magnetic sensor monitoring unit; the interphase weak magnetic sensor monitoring unit is composed of weak magnetic sensors arranged on both sides of each phase in the iron core reactor to be tested; the top weak magnetic sensor monitoring unit is arranged at the top of the iron core reactor to be tested; the bottom weak magnetic sensor monitoring unit is arranged at the bottom of the iron core reactor to be tested;

[0154] The fault information determination module is used to retrieve a preset fault detection analysis table to perform data matching with the first magnetic induction intensity set when detecting that there is a first abnormal magnetic induction intensity exceeding a preset safety threshold in the first magnetic induction intensity set, so as to obtain fault information matching the first magnetic induction intensity set; wherein the fault detection analysis table pre-stores the first magnetic induction intensity of each weak magnetic sensor in the three-terminal weak magnetic sensor array at different turn positions of the iron core reactor to be tested when a fault occurred in the past;

[0155] The turn-to-turn position determination module is used to determine the turn-to-turn position where the fault occurs in the iron-core reactor to be tested according to the fault information.

[0156] In a preferred embodiment, the process of constructing the fault detection analysis table includes:

[0157] Obtaining physical parameters and rated operating parameters of the iron core reactor to be tested;

[0158] Constructing a three-dimensional model of the iron core reactor to be tested according to the physical parameters;

[0159] Mapping the three-dimensional model onto a preset three-dimensional coordinate axis to determine the three-dimensional spatial coordinate information of the iron core reactor to be tested;

[0160] Determine the three-dimensional spatial coordinate information of the three-terminal weak magnetic sensor array with reference to the three-dimensional spatial coordinate information of the iron core reactor to be tested;

[0161] Calculate the second magnetic induction intensity of each weak magnetic sensor in the three-terminal weak magnetic sensor array when the iron core reactor to be tested is in normal operation according to the three-dimensional spatial coordinate information of the iron core reactor to be tested, the three-dimensional spatial coordinate information of the three-terminal weak magnetic sensor array, the physical parameters and the rated operating parameters;

[0162] For each inter-turn position of the iron core reactor to be tested, a fault is simulated at the inter-turn position, and according to the three-dimensional spatial coordinate information of the inter-turn position, the three-dimensional spatial coordinate information of the iron core reactor to be tested, the three-dimensional spatial coordinate information of the three-terminal weak magnetic sensor array, the physical parameters and the rated operating parameters, the third magnetic induction intensity of the position where each weak magnetic sensor is located when the inter-turn position fails is calculated, and the second magnetic induction intensity is superimposed with the third magnetic induction intensity to obtain the first magnetic induction intensity of the position where each weak magnetic sensor is located when the inter-turn position fails;

[0163] A fault detection analysis table is constructed based on the first magnetic induction intensity of the position where each weak magnetic sensor is located when a fault occurs at each inter-turn position.

[0164] In a preferred embodiment, the three-dimensional spatial coordinate information of the three-terminal weak magnetic sensor array is determined with reference to the three-dimensional spatial coordinate information of the iron core reactor to be tested, including:

[0165] Determining the spatial topological relationship of the three-terminal weak magnetic field sensor array relative to the iron core reactor to be tested;

[0166] According to the spatial topological relationship, the three-terminal weak magnetic sensor array is mapped onto the three-dimensional coordinate axis with the three-dimensional spatial coordinate information of the iron core reactor to be tested as a reference to obtain the three-dimensional spatial coordinate information of the three-terminal weak magnetic sensor array.

[0167] In a preferred embodiment, the physical parameters include a height value of the iron core reactor to be tested, a horizontal distance between phases of the iron core reactor to be tested, and a preset radial spacing of the iron core reactor to be tested;

[0168] The determining of the spatial topological relationship of the three-terminal weak magnetic sensing array relative to the iron core reactor to be tested includes:

[0169] Positioning to the top position of the iron core reactor to be tested;

[0170] According to the top position, determining that the top weak magnetic sensor monitoring unit is located at a first height position in the vertical direction;

[0171] Positioning to the bottom end of the iron core reactor to be tested;

[0172] According to the bottom position, determining that the bottom weak magnetic sensor monitoring unit is located at a second height position in the vertical direction;

[0173] Based on the top position, the bottom position and the height value of the iron core reactor to be tested, positioning to the midpoint position of the iron core reactor to be tested in the vertical direction;

[0174] According to the midpoint position, determining that the interphase weak magnetic field sensor monitoring unit is located at a third height position in the vertical direction;

[0175] According to the horizontal distance between the phases in the iron core reactor to be tested and the preset radial spacing, determine that the top weak magnetic sensor monitoring unit is located at a first horizontal position in the horizontal direction, the bottom weak magnetic sensor monitoring unit is located at a second horizontal position in the horizontal direction, and the inter-phase weak magnetic sensor monitoring unit is located at a third horizontal position in the horizontal direction;

[0176] Determine, according to the first height position and the first horizontal position, a spatial topological relationship of the top weak magnetic sensor monitoring unit relative to the iron core reactor to be tested;

[0177] Determine the spatial topological relationship of the bottom weak magnetic sensor monitoring unit relative to the iron core reactor to be tested according to the second height position and the second horizontal position;

[0178] Determine, according to the third height position and the third horizontal position, a spatial topological relationship of the phase-to-phase weak magnetic sensor monitoring unit relative to the iron core reactor to be tested;

[0179] According to the spatial topological relationship of the top weak magnetic sensor monitoring unit relative to the iron core inductor to be tested, the spatial topological relationship of the bottom weak magnetic sensor monitoring unit relative to the iron core inductor to be tested, and the spatial topological relationship of the interphase weak magnetic sensor monitoring unit relative to the iron core inductor to be tested, the spatial topological relationship of the three-terminal weak magnetic sensor array relative to the iron core inductor to be tested is determined.

[0180] In a preferred embodiment, the device for determining the position of an inter-turn fault of an iron core reactor further comprises: a fault phase determination module;

[0181] The fault phase determination module is used to obtain the second magnetic induction intensity set of the iron core reactor to be tested collected by the interphase weak magnetic sensor monitoring unit;

[0182] When it is determined that there is a second abnormal magnetic induction intensity exceeding a preset safety threshold in the second magnetic induction intensity set, determining a target weak magnetic sensor to which the second abnormal magnetic induction intensity belongs;

[0183] The fault phase of the iron-core reactor to be tested is determined according to the spatial topological relationship of the target weak magnetic sensor relative to the iron-core reactor to be tested.

[0184] The above is a preferred embodiment of the present invention. It should be pointed out that a person skilled in the art can make several improvements and modifications without departing from the principle of the present invention. These improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A method for determining the position of an inter-turn fault of an iron core reactor, characterized in that: include: Acquire a first magnetic induction intensity set of the iron core reactor to be tested collected by a three-terminal weak magnetic sensor array; wherein the three-terminal weak magnetic sensor array is composed of a top weak magnetic sensor monitoring unit, an interphase weak magnetic sensor monitoring unit and a bottom weak magnetic sensor monitoring unit; the interphase weak magnetic sensor monitoring unit is composed of weak magnetic sensors arranged on both sides of each phase in the iron core reactor to be tested; the top weak magnetic sensor monitoring unit is arranged at the top of the iron core reactor to be tested; the bottom weak magnetic sensor monitoring unit is arranged at the bottom of the iron core reactor to be tested; When it is detected that there is a first abnormal magnetic induction intensity exceeding a preset safety threshold in the first magnetic induction intensity set, a preset fault detection analysis table is retrieved to perform data matching with the first magnetic induction intensity set to obtain fault information matching the first magnetic induction intensity set; wherein the fault detection analysis table pre-stores the first magnetic induction intensity of each weak magnetic sensor in the three-terminal weak magnetic sensor array at different turn positions of the iron core reactor to be tested when a fault occurred in the past; According to the fault information, the turn-to-turn position where the fault occurs in the iron-core reactor to be tested is determined.

2. The method for determining the position of an inter-turn fault of an iron core reactor according to claim 1, characterized in that: The process of constructing the fault detection analysis table includes: Obtaining physical parameters and rated operating parameters of the iron core reactor to be tested; Constructing a three-dimensional model of the iron core reactor to be tested according to the physical parameters; Mapping the three-dimensional model onto a preset three-dimensional coordinate axis to determine the three-dimensional spatial coordinate information of the iron core reactor to be tested; Determine the three-dimensional spatial coordinate information of the three-terminal weak magnetic sensor array with reference to the three-dimensional spatial coordinate information of the iron core reactor to be tested; Calculate the second magnetic induction intensity of each weak magnetic sensor in the three-terminal weak magnetic sensor array when the iron core reactor to be tested is in normal operation according to the three-dimensional spatial coordinate information of the iron core reactor to be tested, the three-dimensional spatial coordinate information of the three-terminal weak magnetic sensor array, the physical parameters and the rated operating parameters; For each inter-turn position of the iron core reactor to be tested, a fault is simulated at the inter-turn position, and according to the three-dimensional spatial coordinate information of the inter-turn position, the three-dimensional spatial coordinate information of the iron core reactor to be tested, the three-dimensional spatial coordinate information of the three-terminal weak magnetic sensor array, the physical parameters and the rated operating parameters, the third magnetic induction intensity of the position where each weak magnetic sensor is located when the inter-turn position fails is calculated, and the second magnetic induction intensity is superimposed with the third magnetic induction intensity to obtain the first magnetic induction intensity of the position where each weak magnetic sensor is located when the inter-turn position fails; A fault detection analysis table is constructed based on the first magnetic induction intensity of the position where each weak magnetic sensor is located when a fault occurs at each inter-turn position.

3. The method for determining the position of an inter-turn fault of an iron core reactor according to claim 2, characterized in that: The method of determining the three-dimensional spatial coordinate information of the three-terminal weak magnetic sensor array by taking the three-dimensional spatial coordinate information of the iron core reactor to be tested as a reference includes: Determining the spatial topological relationship of the three-terminal weak magnetic field sensor array relative to the iron core reactor to be tested; According to the spatial topological relationship, the three-terminal weak magnetic sensor array is mapped onto the three-dimensional coordinate axis with the three-dimensional spatial coordinate information of the iron core reactor to be tested as a reference to obtain the three-dimensional spatial coordinate information of the three-terminal weak magnetic sensor array.

4. The method for determining the position of an inter-turn fault of an iron core reactor according to claim 3, characterized in that: The physical parameters include the height value of the iron core reactor to be tested, the horizontal distance between the phases of the iron core reactor to be tested, and the preset radial spacing of the iron core reactor to be tested; The determining of the spatial topological relationship of the three-terminal weak magnetic sensing array relative to the iron core reactor to be tested includes: Positioning to the top position of the iron core reactor to be tested; According to the top position, determining that the top weak magnetic sensor monitoring unit is located at a first height position in the vertical direction; Positioning to the bottom end of the iron core reactor to be tested; According to the bottom position, determining that the bottom weak magnetic sensor monitoring unit is located at a second height position in the vertical direction; Based on the top position, the bottom position and the height value of the iron core reactor to be tested, positioning to the midpoint position of the iron core reactor to be tested in the vertical direction; According to the midpoint position, determining that the interphase weak magnetic field sensor monitoring unit is located at a third height position in the vertical direction; According to the horizontal distance between the phases in the iron core reactor to be tested and the preset radial spacing, determine that the top weak magnetic sensor monitoring unit is located at a first horizontal position in the horizontal direction, the bottom weak magnetic sensor monitoring unit is located at a second horizontal position in the horizontal direction, and the inter-phase weak magnetic sensor monitoring unit is located at a third horizontal position in the horizontal direction; Determine, according to the first height position and the first horizontal position, a spatial topological relationship of the top weak magnetic sensor monitoring unit relative to the iron core reactor to be tested; Determine the spatial topological relationship of the bottom weak magnetic sensor monitoring unit relative to the iron core reactor to be tested according to the second height position and the second horizontal position; Determine, according to the third height position and the third horizontal position, a spatial topological relationship of the phase-to-phase weak magnetic sensor monitoring unit relative to the iron core reactor to be tested; According to the spatial topological relationship of the top weak magnetic sensor monitoring unit relative to the iron core inductor to be tested, the spatial topological relationship of the bottom weak magnetic sensor monitoring unit relative to the iron core inductor to be tested, and the spatial topological relationship of the interphase weak magnetic sensor monitoring unit relative to the iron core inductor to be tested, the spatial topological relationship of the three-terminal weak magnetic sensor array relative to the iron core inductor to be tested is determined.

5. The method for determining the position of an inter-turn fault of an iron core reactor according to claim 4, characterized in that: Also includes: Acquire a second magnetic induction intensity set of the iron core reactor to be tested collected by the interphase weak magnetic sensor monitoring unit; When it is determined that there is a second abnormal magnetic induction intensity exceeding a preset safety threshold in the second magnetic induction intensity set, determining a target weak magnetic sensor to which the second abnormal magnetic induction intensity belongs; The fault phase of the iron-core reactor to be tested is determined according to the spatial topological relationship of the target weak magnetic sensor relative to the iron-core reactor to be tested.

6. A device for determining the position of an inter-turn fault of an iron core reactor, characterized in that: include: A first magnetic induction intensity set acquisition module, a fault information determination module and a turn-to-turn position determination module; The first magnetic induction intensity set acquisition module is used to acquire the first magnetic induction intensity set of the iron core reactor to be tested collected by the three-terminal weak magnetic sensor array; wherein the three-terminal weak magnetic sensor array is composed of a top weak magnetic sensor monitoring unit, an interphase weak magnetic sensor monitoring unit and a bottom weak magnetic sensor monitoring unit; the interphase weak magnetic sensor monitoring unit is composed of weak magnetic sensors arranged on both sides of each phase in the iron core reactor to be tested; the top weak magnetic sensor monitoring unit is arranged at the top of the iron core reactor to be tested; the bottom weak magnetic sensor monitoring unit is arranged at the bottom of the iron core reactor to be tested; The fault information determination module is used to retrieve a preset fault detection analysis table to perform data matching with the first magnetic induction intensity set when detecting that there is a first abnormal magnetic induction intensity exceeding a preset safety threshold in the first magnetic induction intensity set, so as to obtain fault information matching the first magnetic induction intensity set; wherein the fault detection analysis table pre-stores the first magnetic induction intensity of each weak magnetic sensor in the three-terminal weak magnetic sensor array at different turn positions of the iron core reactor to be tested when a fault occurred in the past; The turn-to-turn position determination module is used to determine the turn-to-turn position where the fault occurs in the iron-core reactor to be tested according to the fault information.

7. The device for determining the position of an inter-turn fault of an iron core reactor according to claim 6, characterized in that: The process of constructing the fault detection analysis table includes: Obtaining physical parameters and rated operating parameters of the iron core reactor to be tested; Constructing a three-dimensional model of the iron core reactor to be tested according to the physical parameters; Mapping the three-dimensional model onto a preset three-dimensional coordinate axis to determine the three-dimensional spatial coordinate information of the iron core reactor to be tested; Determine the three-dimensional spatial coordinate information of the three-terminal weak magnetic sensor array with reference to the three-dimensional spatial coordinate information of the iron core reactor to be tested; Calculate the second magnetic induction intensity of each weak magnetic sensor in the three-terminal weak magnetic sensor array when the iron core reactor to be tested is in normal operation according to the three-dimensional spatial coordinate information of the iron core reactor to be tested, the three-dimensional spatial coordinate information of the three-terminal weak magnetic sensor array, the physical parameters and the rated operating parameters; For each inter-turn position of the iron core reactor to be tested, a fault is simulated at the inter-turn position, and according to the three-dimensional spatial coordinate information of the inter-turn position, the three-dimensional spatial coordinate information of the iron core reactor to be tested, the three-dimensional spatial coordinate information of the three-terminal weak magnetic sensor array, the physical parameters and the rated operating parameters, the third magnetic induction intensity of the position where each weak magnetic sensor is located when the inter-turn position fails is calculated, and the second magnetic induction intensity is superimposed with the third magnetic induction intensity to obtain the first magnetic induction intensity of the position where each weak magnetic sensor is located when the inter-turn position fails; A fault detection analysis table is constructed based on the first magnetic induction intensity of the position where each weak magnetic sensor is located when a fault occurs at each inter-turn position.

8. The device for determining the position of an inter-turn fault of an iron core reactor according to claim 7, characterized in that: The method of determining the three-dimensional spatial coordinate information of the three-terminal weak magnetic sensor array by taking the three-dimensional spatial coordinate information of the iron core reactor to be tested as a reference includes: Determining the spatial topological relationship of the three-terminal weak magnetic field sensor array relative to the iron core reactor to be tested; According to the spatial topological relationship, the three-terminal weak magnetic sensor array is mapped onto the three-dimensional coordinate axis with the three-dimensional spatial coordinate information of the iron core reactor to be tested as a reference to obtain the three-dimensional spatial coordinate information of the three-terminal weak magnetic sensor array.

9. The device for determining the position of an inter-turn fault of an iron core reactor according to claim 8, characterized in that: The physical parameters include the height value of the iron core reactor to be tested, the horizontal distance between the phases of the iron core reactor to be tested, and the preset radial spacing of the iron core reactor to be tested; The determining of the spatial topological relationship of the three-terminal weak magnetic sensing array relative to the iron core reactor to be tested includes: Positioning to the top position of the iron core reactor to be tested; According to the top position, determining that the top weak magnetic sensor monitoring unit is located at a first height position in the vertical direction; Positioning to the bottom end of the iron core reactor to be tested; According to the bottom position, determining that the bottom weak magnetic sensor monitoring unit is located at a second height position in the vertical direction; Based on the top position, the bottom position and the height value of the iron core reactor to be tested, positioning to the midpoint position of the iron core reactor to be tested in the vertical direction; According to the midpoint position, determining that the interphase weak magnetic field sensor monitoring unit is located at a third height position in the vertical direction; According to the horizontal distance between the phases in the iron core reactor to be tested and the preset radial spacing, determine that the top weak magnetic sensor monitoring unit is located at a first horizontal position in the horizontal direction, the bottom weak magnetic sensor monitoring unit is located at a second horizontal position in the horizontal direction, and the inter-phase weak magnetic sensor monitoring unit is located at a third horizontal position in the horizontal direction; Determine, according to the first height position and the first horizontal position, a spatial topological relationship of the top weak magnetic sensor monitoring unit relative to the iron core reactor to be tested; Determine the spatial topological relationship of the bottom weak magnetic sensor monitoring unit relative to the iron core reactor to be tested according to the second height position and the second horizontal position; Determine, according to the third height position and the third horizontal position, a spatial topological relationship of the phase-to-phase weak magnetic sensor monitoring unit relative to the iron core reactor to be tested; According to the spatial topological relationship of the top weak magnetic sensor monitoring unit relative to the iron core inductor to be tested, the spatial topological relationship of the bottom weak magnetic sensor monitoring unit relative to the iron core inductor to be tested, and the spatial topological relationship of the interphase weak magnetic sensor monitoring unit relative to the iron core inductor to be tested, the spatial topological relationship of the three-terminal weak magnetic sensor array relative to the iron core inductor to be tested is determined.

10. The device for determining the position of an inter-turn fault of an iron core reactor according to claim 9, characterized in that: Also includes: Fault phase determination module; The fault phase determination module is used to obtain the second magnetic induction intensity set of the iron core reactor to be tested collected by the interphase weak magnetic sensor monitoring unit; When it is determined that there is a second abnormal magnetic induction intensity exceeding a preset safety threshold in the second magnetic induction intensity set, determining a target weak magnetic sensor to which the second abnormal magnetic induction intensity belongs; The fault phase of the iron-core reactor to be tested is determined according to the spatial topological relationship of the target weak magnetic sensor relative to the iron-core reactor to be tested.

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