A method and device for determining the location of a turn-to-turn fault in an iron-core reactor

Abstract

The application discloses a kind of iron core reactor interturn fault position determination method and device, the method is by three-end weak magnetic sensing array collection first magnetic induction intensity set of the iron core reactor to be measured, and when detecting that there is first abnormal magnetic induction intensity exceeding preset safety threshold in first magnetic induction intensity set, preset fault detection analysis table is called and first magnetic induction intensity set is carried out data matching, obtain the fault information matched with first magnetic induction intensity set, then according to fault information, the interturn position of the iron core reactor to be measured is determined to occur fault.Because three-end weak magnetic sensing array is provided with weak magnetic sensor in the top position, phase-to-phase position and bottom position of the iron core reactor to be measured, so abnormality of the iron core reactor can be effectively captured, and the fault information matched with first magnetic induction intensity set is determined by fault detection analysis table, without complex investigation process, the accuracy and efficiency of interturn fault positioning are greatly improved.

Description

Technical Field

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

[0002] Iron-core reactors play a vital role in power systems, but they can experience faults such as interturn short circuits during operation. Traditional detection methods, such as those that rely on electrical parameter measurements (including current and voltage), for iron-core reactor fault diagnosis exhibit low sensitivity when detecting minor faults such as interturn short circuits. In the early stages of a fault, changes in electrical parameters can be very subtle, making it difficult to accurately capture the fault signal, which often leads to missed faults or misdiagnosis.

[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 iron-core reactors. Especially in multi-phase reactors, these technologies have difficulty distinguishing fault characteristics in different phases and locations, thus limiting the accuracy of fault diagnosis. Summary of the Invention

[0004] The present invention provides a method and device for determining the location of an inter-turn fault in 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. As a result, 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 the location of an inter-turn fault in 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; and the bottom weak magnetic sensor monitoring unit is arranged at the bottom of the iron-core reactor to be tested;

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

[0008] According to the fault information, the inter-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] Determining 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] Calculating, 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 field sensor array, the physical parameters, and the rated operating parameters, a second magnetic induction intensity at a position where each weak magnetic field sensor in the three-terminal weak magnetic field sensor array is located when the iron-core reactor to be tested is operating normally;

[0015] For each inter-turn position of the iron-core reactor to be tested, simulate a fault at the inter-turn position, and calculate the third magnetic induction intensity at the position of each weak magnetic sensor when the inter-turn position fails based on 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, and superimpose the second magnetic induction intensity with the third magnetic induction intensity to obtain the first magnetic induction intensity at the position of each weak magnetic sensor when the inter-turn position fails;

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

[0017] Furthermore, 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 a spatial topological relationship between the three-terminal weak magnetic field sensing array and the iron core reactor to be measured;

[0019] According to the spatial topological relationship, the three-terminal weak magnetic sensing 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 sensing array.

[0020] Furthermore, 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] Determining the spatial topological relationship of the three-terminal weak magnetic sensing array relative to the iron core reactor to be measured 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 the iron-core reactor to be tested at the midpoint in the vertical direction;

[0027] According to the midpoint position, determining that the interphase weak magnetic 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, determining that the top weak magnetic field sensor monitoring unit is located at a first horizontal position in the horizontal direction, the bottom weak magnetic field sensor monitoring unit is located at a second horizontal position in the horizontal direction, and the inter-phase weak magnetic field sensor monitoring unit is located at a third horizontal position in the horizontal direction;

[0029] Determining a spatial topological relationship between the top magnetic field weakening sensor monitoring unit and the iron core reactor to be tested according to the first height position and the first horizontal position;

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

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

[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 inter-phase 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 location of an inter-turn fault in 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 a second abnormal magnetic induction intensity exceeding a preset safety threshold exists 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 measured is determined according to a spatial topological relationship between the target weak magnetic sensor and the iron-core reactor to be measured.

[0037] An embodiment of the present invention further provides a device for determining an inter-turn fault location 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 configured to, when detecting that there is a first abnormal magnetic induction intensity exceeding a preset safety threshold in the first magnetic induction intensity set, call a preset fault detection analysis table and perform data matching with the first magnetic induction intensity set to obtain fault information matched with the first magnetic induction intensity set; wherein the fault detection analysis table pre-stores the first magnetic induction intensity of each position of the weak magnetic sensor in the three-terminal weak magnetic sensing array at different turn-to-turn positions of the to-be-tested core reactor when a fault occurs historically.

[0041] The turn-to-turn position determination module is configured to determine the turn-to-turn position of the to-be-tested core reactor where a fault occurs according to the fault information.

[0042] Further, the construction process of the fault detection analysis table comprises:

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

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

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

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

[0047] According to the three-dimensional spatial coordinate information of the to-be-tested core reactor, the three-dimensional spatial coordinate information of the three-terminal weak magnetic sensing array, the physical parameters and the rated operating parameters, calculating the second magnetic induction intensity of each position of the weak magnetic sensor in the three-terminal weak magnetic sensing array when the to-be-tested core reactor is normally operated;

[0048] For each turn-to-turn position of the to-be-tested core reactor, simulating a fault occurring at the turn-to-turn position, calculating the third magnetic induction intensity of each position of the weak magnetic sensor when the turn-to-turn position is faulty according to the three-dimensional spatial coordinate information of the turn-to-turn position, the three-dimensional spatial coordinate information of the to-be-tested core reactor, the three-dimensional spatial coordinate information of the three-terminal weak magnetic sensing array, the physical parameters and the rated operating parameters, and superimposing the second magnetic induction intensity and the third magnetic induction intensity to obtain the first magnetic induction intensity of each position of the weak magnetic sensor when the turn-to-turn position is faulty;

[0049] Constructing a fault detection analysis table based on the first magnetic induction intensity of each position of the weak magnetic sensor when each turn-to-turn position is faulty.

[0050] Furthermore, 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 a spatial topological relationship between the three-terminal weak magnetic field sensing array and the iron core reactor to be measured;

[0052] According to the spatial topological relationship, the three-terminal weak magnetic sensing 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 sensing array.

[0053] Furthermore, 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] Determining the spatial topological relationship of the three-terminal weak magnetic sensing array relative to the iron core reactor to be measured 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 the iron-core reactor to be tested at the midpoint in the vertical direction;

[0060] According to the midpoint position, determining that the interphase weak magnetic 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, determining that the top weak magnetic field sensor monitoring unit is located at a first horizontal position in the horizontal direction, the bottom weak magnetic field sensor monitoring unit is located at a second horizontal position in the horizontal direction, and the inter-phase weak magnetic field sensor monitoring unit is located at a third horizontal position in the horizontal direction;

[0062] Determining a spatial topological relationship between the top magnetic field weakening sensor monitoring unit and the iron core reactor to be tested according to the first height position and the first horizontal position;

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

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

[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 inter-phase 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 includes: a fault phase determination module;

[0067] The fault phase determination module is configured to obtain a 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 a second abnormal magnetic induction intensity exceeding a preset safety threshold exists 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 measured is determined according to a spatial topological relationship between the target weak magnetic sensor and the iron-core reactor to be measured.

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

[0071] The present invention provides a method and device for determining the location of an inter-turn fault in an iron-core reactor. The method comprises: providing a top weak-magnetic field sensor monitoring unit at the top position of the iron-core reactor to be tested, providing an inter-phase weak-magnetic field sensor monitoring unit at the phase position of the iron-core reactor to be tested, and providing a bottom weak-magnetic field sensor monitoring unit at the bottom position of the iron-core reactor to be tested. Therefore, the three-terminal weak-magnetic field sensor array formed by the method can effectively capture abnormal information when monitoring the magnetic field distribution of the iron-core reactor, providing 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. Thus, there is no need for a complicated troubleshooting process, which greatly improves the accuracy and efficiency of fault location. The detection method based on weak magnetic sensing is a non-invasive detection method and 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 following is a brief introduction to the drawings required for use in the implementation. Obviously, the drawings described below are only some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0074] Figure 1 This is a flow chart of a method for determining an inter-turn fault location of an iron core reactor provided in one 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 This is a structural diagram of a device for determining an inter-turn fault location of an iron core reactor provided in one 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] To make the objectives, technical solutions, and advantages of this application more clear, the technical solutions in this application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are only 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 making any creative efforts 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 those skilled in the art 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" and any variations thereof in the specification and claims of this application and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0081] In the description of the embodiments of this application, the technical terms "first" and "second" are used only to distinguish different objects and should not be understood to indicate or imply relative importance or implicitly specify the quantity, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "plurality" is more than two, unless otherwise clearly and specifically defined.

[0082] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, 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 this application, the term "and / or" is simply a description of the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent the following three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally indicates that the associated objects 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 expressly specified or limited, technical terms such as "installed," "connected," "connected," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; internal connections between two components or interactions between two components. Those skilled in the art can understand the specific meanings of the above terms in the embodiments of the present application based on specific circumstances.

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

[0087] S1. Obtain 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; and 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] Determining the spatial topological relationship of the three-terminal weak magnetic sensing array relative to the iron core reactor to be measured 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 the iron-core reactor to be tested at the midpoint in the vertical direction;

[0095] According to the midpoint position, determining that the interphase weak magnetic 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, determining that the top weak magnetic field sensor monitoring unit is located at a first horizontal position in the horizontal direction, the bottom weak magnetic field sensor monitoring unit is located at a second horizontal position in the horizontal direction, and the inter-phase weak magnetic field sensor monitoring unit is located at a third horizontal position in the horizontal direction;

[0097] Determining a spatial topological relationship between the top magnetic field weakening sensor monitoring unit and the iron core reactor to be tested according to the first height position and the first horizontal position;

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

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

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

[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] Schematically, in order to enable the three-terminal weak magnetic field sensor array to more accurately monitor the change in 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 field 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 2Taking 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 placed directly 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. The specific value of the safety distance 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 to 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 between 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 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 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 interphase 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 interphase 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 used as the third height position of the interphase weak magnetic sensor monitoring unit; finally, the spatial topological relationship of the interphase weak magnetic sensor monitoring unit relative to the iron core reactor to be tested is determined based on 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 a first abnormal magnetic induction intensity exceeding a preset safety threshold is detected in the first magnetic induction intensity set, a preset fault detection and analysis table is retrieved for data matching with the first magnetic induction intensity set to obtain fault information matching the first magnetic induction intensity set; wherein the fault detection and analysis table pre-stores first magnetic induction intensities at positions of each weak magnetic sensor in the three-terminal weak magnetic sensor array at different inter-turn positions of the iron core reactor to be tested when historical faults occurred;

[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] Determining 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] Calculating, 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 field sensor array, the physical parameters, and the rated operating parameters, a second magnetic induction intensity at a position where each weak magnetic field sensor in the three-terminal weak magnetic field sensor array is located when the iron-core reactor to be tested is operating normally;

[0119] For each inter-turn position of the iron-core reactor to be tested, simulate a fault at the inter-turn position, and calculate the third magnetic induction intensity at the position of each weak magnetic sensor when the inter-turn position fails based on 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, and superimpose the second magnetic induction intensity with the third magnetic induction intensity to obtain the first magnetic induction intensity at the position of each weak magnetic sensor when the inter-turn position fails;

[0120] A fault detection analysis table is constructed based on the first magnetic induction intensity at the position of each weak magnetic sensor 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 the iron core coil of each phase, 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 inter-turn position when a fault occurs, it is necessary to first construct a three-dimensional model of the iron-core inductor to be tested based on 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 inductor 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] Schematically, 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 determining of 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 includes:

[0126] Determining a spatial topological relationship between the three-terminal weak magnetic field sensing array and the iron core reactor to be measured;

[0127] According to the spatial topological relationship, the three-terminal weak magnetic field 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, so as to obtain the three-dimensional spatial coordinate information of the three-terminal weak magnetic field sensor array;

[0128] Specifically, the three-dimensional spatial coordinate information of the iron-core inductor to be tested is used as a reference benchmark, 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 be tested, so as to obtain the three-dimensional spatial coordinate information of the three-terminal weak magnetic sensor array.

[0129] Calculating, 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 field sensor array, the physical parameters, and the rated operating parameters, a second magnetic induction intensity at a position where each weak magnetic field sensor in the three-terminal weak magnetic field sensor array is located when the iron-core reactor to be tested is operating normally;

[0130] Specifically, see Figure 3 , the second magnetic induction intensity at the position 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] Where, 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, simulate a fault at the inter-turn position, and calculate the third magnetic induction intensity at the position of each weak magnetic sensor when the inter-turn position fails based on 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, and superimpose the second magnetic induction intensity with the third magnetic induction intensity to obtain the first magnetic induction intensity at the position of each weak magnetic sensor 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 at the position of each weak magnetic sensor when 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 space 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 a fault detection analysis table is constructed 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, this application uses an iron core reactor with a voltage level of 10kV, a rated current of 252A, a reactor coil height H of 79cm, an outer diameter D of 47cm, and an inner diameter a of 34cm to conduct a fault experiment. 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 for illustration only.

[0143] Specifically, when it is detected that a first abnormal magnetic induction intensity exceeding a preset safety threshold value exists in the first magnetic induction intensity set of the iron core reactor to be tested collected by the three-terminal weak magnetic sensor array, 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, based on the fault information, the inter-turn position of the faulty iron-core reactor to be tested;

[0146] Specifically, after the fault information is determined, it means that the inter-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 location of an inter-turn fault in 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 a second abnormal magnetic induction intensity exceeding a preset safety threshold exists in the second magnetic induction intensity set, determining a target weak magnetic sensor to which the second abnormal magnetic induction intensity belongs;

[0150] determining a fault phase of the iron-core reactor to be tested according to a spatial topological relationship between the target weak magnetic sensor and 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 its corresponding first magnetic induction intensity. 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 inter-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 Figure 2 , is a device for determining an inter-turn fault position 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 configured to retrieve a preset fault detection and analysis table for data matching with the first magnetic induction intensity set when a first abnormal magnetic induction intensity exceeding a preset safety threshold is detected in the first magnetic induction intensity set, thereby obtaining fault information that matches the first magnetic induction intensity set; wherein the fault detection and analysis table pre-stores first magnetic induction intensities at different inter-turn positions of the iron-core reactor to be tested, at the time of historical faults;

[0155] The inter-turn position determination module is used to determine the inter-turn position where the fault occurs in the iron-core reactor to be tested based on 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] Determining 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] Calculating, 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 field sensor array, the physical parameters, and the rated operating parameters, a second magnetic induction intensity at a position where each weak magnetic field sensor in the three-terminal weak magnetic field sensor array is located when the iron-core reactor to be tested is operating normally;

[0162] For each inter-turn position of the iron-core reactor to be tested, simulate a fault at the inter-turn position, and calculate the third magnetic induction intensity at the position of each weak magnetic sensor when the inter-turn position fails based on 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, and superimpose the second magnetic induction intensity with the third magnetic induction intensity to obtain the first magnetic induction intensity at the position of each weak magnetic sensor when the inter-turn position fails;

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

[0164] In a preferred embodiment, the determining of 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 includes:

[0165] Determining a spatial topological relationship between the three-terminal weak magnetic field sensing array and the iron core reactor to be measured;

[0166] According to the spatial topological relationship, the three-terminal weak magnetic sensing 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 sensing 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] Determining the spatial topological relationship of the three-terminal weak magnetic sensing array relative to the iron core reactor to be measured 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 the iron-core reactor to be tested at the midpoint in the vertical direction;

[0174] According to the midpoint position, determining that the interphase weak magnetic 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, determining that the top weak magnetic field sensor monitoring unit is located at a first horizontal position in the horizontal direction, the bottom weak magnetic field sensor monitoring unit is located at a second horizontal position in the horizontal direction, and the inter-phase weak magnetic field sensor monitoring unit is located at a third horizontal position in the horizontal direction;

[0176] Determining a spatial topological relationship between the top magnetic field weakening sensor monitoring unit and the iron core reactor to be tested according to the first height position and the first horizontal position;

[0177] According to the second height position and the second horizontal position, the spatial topological relationship of the bottom-end weak magnetic sensor monitoring unit relative to the to-be-tested core reactor is determined;

[0178] According to the third height position and the third horizontal position, the spatial topological relationship of the inter-phase weak magnetic sensor monitoring unit relative to the to-be-tested core reactor is determined;

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

[0180] In a preferred embodiment, the core reactor turn-to-turn fault position determination apparatus further comprises a fault phase determination module;

[0181] The fault phase determination module is configured to acquire the second magnetic induction intensity set of the to-be-tested core reactor collected by the inter-phase 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, a target weak magnetic sensor to which the second abnormal magnetic induction intensity belongs is determined.

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

[0184] The above describes the preferred embodiments of the present application. It should be noted that, for those skilled in the art, without departing from the principles of the present application, several improvements and refinements can be made, which are also considered within the protection scope of the present application.

Claims

1. A method for determining the location of an inter-turn fault in 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; and the bottom weak magnetic sensor monitoring unit is arranged at the bottom of the iron-core reactor to be tested; When a first abnormal magnetic induction intensity exceeding a preset safety threshold is detected in the first magnetic induction intensity set, a preset fault detection and 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 and analysis table pre-stores first magnetic induction intensities at positions of each weak magnetic sensor in the three-terminal weak magnetic sensor array at different inter-turn positions of the iron core reactor to be tested when historical faults occurred; and a process of constructing the fault detection and 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; Determining 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; Calculating, 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 field sensor array, the physical parameters, and the rated operating parameters, a second magnetic induction intensity at a position where each weak magnetic field sensor in the three-terminal weak magnetic field sensor array is located when the iron-core reactor to be tested is operating normally; For each inter-turn position of the iron-core reactor to be tested, simulate a fault at the inter-turn position, and calculate the third magnetic induction intensity at the position of each weak magnetic sensor when the inter-turn position fails based on 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, and superimpose the second magnetic induction intensity with the third magnetic induction intensity to obtain the first magnetic induction intensity at the position of each weak magnetic sensor when the inter-turn position fails; Constructing a fault detection analysis table based on the first magnetic induction intensity of each weak magnetic sensor at the position when a fault occurs at each inter-turn position; According to the fault information, the inter-turn position where the fault occurs in the iron-core reactor to be tested is determined.

2. The method for determining the location of an inter-turn fault in an iron core reactor according to claim 1, wherein: The determining of the three-dimensional spatial coordinate information of the three-terminal weak magnetic field sensor array with reference to the three-dimensional spatial coordinate information of the iron core reactor to be tested includes: Determining a spatial topological relationship between the three-terminal weak magnetic field sensing array and the iron core reactor to be measured; According to the spatial topological relationship, the three-terminal weak magnetic sensing 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 sensing array.

3. The method for determining the location of an inter-turn fault in an iron core reactor according to claim 2, wherein: 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; Determining the spatial topological relationship of the three-terminal weak magnetic sensing array relative to the iron core reactor to be measured 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 the iron-core reactor to be tested at the midpoint in the vertical direction; According to the midpoint position, determining that the interphase weakening magnetic 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, determining that the top weak magnetic field sensor monitoring unit is located at a first horizontal position in the horizontal direction, the bottom weak magnetic field sensor monitoring unit is located at a second horizontal position in the horizontal direction, and the inter-phase weak magnetic field sensor monitoring unit is located at a third horizontal position in the horizontal direction; Determining a spatial topological relationship between the top magnetic field weakening sensor monitoring unit and the iron core reactor to be tested according to the first height position and the first horizontal position; Determining a spatial topological relationship between the bottom weak magnetic sensor monitoring unit and the iron core reactor to be tested according to the second height position and the second horizontal position; Determining a spatial topological relationship of the interphase weak magnetic field sensor monitoring unit relative to the iron core reactor to be tested according to the third height position and the third horizontal position; 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 relationship of the three-terminal weak magnetic sensor array relative to the iron core inductor to be tested is determined.

4. The method for determining the location of an inter-turn fault in an iron core reactor according to claim 3, wherein: 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 a second abnormal magnetic induction intensity exceeding a preset safety threshold exists 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 measured is determined according to a spatial topological relationship between the target weak magnetic sensor and the iron-core reactor to be measured.

5. A device for determining the location of an inter-turn fault in 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 configured to retrieve a preset fault detection and analysis table for data matching with the first magnetic induction intensity set upon detecting the presence of a first abnormal magnetic induction intensity exceeding a preset safety threshold in the first magnetic induction intensity set, thereby obtaining fault information matching the first magnetic induction intensity set. The fault detection and analysis table pre-stores first magnetic induction intensities at positions of each weak magnetic sensor in the three-terminal weak magnetic sensor array at different inter-turn positions of the iron-core reactor to be tested when historical faults occurred. The process of constructing the fault detection and 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; Determining 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; Calculating, 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 field sensor array, the physical parameters, and the rated operating parameters, a second magnetic induction intensity at a position where each weak magnetic field sensor in the three-terminal weak magnetic field sensor array is located when the iron-core reactor to be tested is operating normally; For each inter-turn position of the iron-core reactor to be tested, simulate a fault at the inter-turn position, and calculate the third magnetic induction intensity at the position of each weak magnetic sensor when the inter-turn position fails based on 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, and superimpose the second magnetic induction intensity with the third magnetic induction intensity to obtain the first magnetic induction intensity at the position of each weak magnetic sensor when the inter-turn position fails; Constructing a fault detection analysis table based on the first magnetic induction intensity of each weak magnetic sensor at the position when a fault occurs at each inter-turn position; The inter-turn position determination module is used to determine the inter-turn position where the fault occurs in the iron-core reactor to be tested based on the fault information.

6. The device for determining the position of an inter-turn fault in an iron core reactor according to claim 5, wherein: The determining of the three-dimensional spatial coordinate information of the three-terminal weak magnetic field sensor array with reference to the three-dimensional spatial coordinate information of the iron core reactor to be tested includes: Determining a spatial topological relationship between the three-terminal weak magnetic field sensing array and the iron core reactor to be measured; According to the spatial topological relationship, the three-terminal weak magnetic sensing 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 sensing array.

7. The device for determining the location of an inter-turn fault in an iron core reactor according to claim 6, wherein: 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; Determining the spatial topological relationship of the three-terminal weak magnetic sensing array relative to the iron core reactor to be measured 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 the iron-core reactor to be tested at the midpoint in the vertical direction; According to the midpoint position, determining that the interphase weakening magnetic 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, determining that the top weak magnetic field sensor monitoring unit is located at a first horizontal position in the horizontal direction, the bottom weak magnetic field sensor monitoring unit is located at a second horizontal position in the horizontal direction, and the inter-phase weak magnetic field sensor monitoring unit is located at a third horizontal position in the horizontal direction; Determining a spatial topological relationship between the top magnetic field weakening sensor monitoring unit and the iron core reactor to be tested according to the first height position and the first horizontal position; Determining a spatial topological relationship between the bottom weak magnetic sensor monitoring unit and the iron core reactor to be tested according to the second height position and the second horizontal position; Determining a spatial topological relationship of the interphase weak magnetic field sensor monitoring unit relative to the iron core reactor to be tested according to the third height position and the third horizontal position; 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 relationship of the three-terminal weak magnetic sensor array relative to the iron core inductor to be tested is determined.

8. The device for determining the location of an inter-turn fault in an iron core reactor according to claim 7, wherein: Also includes: Fault phase determination module; The fault phase determination module is configured to obtain 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 a second abnormal magnetic induction intensity exceeding a preset safety threshold exists 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 measured is determined according to a spatial topological relationship between the target weak magnetic sensor and the iron-core reactor to be measured.

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