Inter-turn short circuit detection method, apparatus, medium, and device

Abstract

The application discloses a kind of interturn short circuit detection method, device, medium and equipment, first based on the current value at each setting position Calculation current difference value, again by comparing the absolute value of all current difference values With the size of the first difference value threshold It can be judged whether there is interturn short circuit.Compared with the prior art, the application is based on the current difference value of each setting position to judge whether there is interturn short circuit, so it can find the interturn short circuit problem more timely.

Description

Technical Field

[0001] This invention relates to the field of online condition monitoring technology for electrical equipment, and in particular to a method, apparatus, medium, and device for detecting inter-turn short circuits. Background Technology

[0002] As widely used equipment in substations, reactors are prone to inter-turn short circuits. An increase in the number of inter-turn short circuit points can further lead to serious fires.

[0003] Current reactor current monitoring technologies mainly focus on monitoring the busbar current. However, the unbalanced current caused by inter-turn short circuits can be automatically balanced between adjacent windings, so the change in busbar current is very small. This makes it impossible to detect inter-turn short circuit problems in a timely manner when only monitoring the busbar current. Summary of the Invention

[0004] Therefore, it is necessary to provide inter-turn short circuit detection methods, devices, media, and equipment to solve the problem that existing technologies cannot detect inter-turn short circuits in a timely manner.

[0005] A method for detecting inter-turn short circuits, applied to a reactor, the reactor comprising B turns of winding connected in parallel, each turn of winding having N current sensors spaced at intervals, the current sensors on different windings being positioned identically, the method comprising:

[0006] Obtain the current values ​​of all current sensors to obtain B*N current values;

[0007] Calculate the average current value of the B-turn winding at the nth setting position to obtain N average current values; where 1≤n≤N;

[0008] Based on all current values ​​and the average current value at the nth setting position, calculate B current difference values ​​at the nth setting position to obtain B*N current difference values; wherein, the current difference values ​​are used to indicate the magnitude of change of the current value at the same setting position compared to the average current value.

[0009] If the absolute values ​​of all B*N current differences are less than a preset first difference threshold, it is determined that there is no inter-turn short circuit. If at least one of the absolute values ​​of the B*N current differences is greater than or equal to the preset first difference threshold, it is determined that there is an inter-turn short circuit.

[0010] In one embodiment, the formula for calculating the current difference value is:

[0011]

[0012] In the above formula, Δi bnIndicates the current difference value at the nth setting position of the b-th turn, 1≤b≤B; i bn Indicates the current value at the nth setting position of the b-th turn, i avn Indicates the average current at the nth setting position.

[0013] In one embodiment, the method further includes:

[0014] If the b1-th turn and the b2-th turn satisfy the first coarse positioning condition and the second coarse positioning condition, then it is determined that the inter-turn short circuit occurs between the b1-th turn and the b2-th turn; wherein, 1≤b1≤B, 1≤b2≤B, b1≠b2, the first coarse positioning condition is that the absolute value of the first current difference at the nth setting position of the b1-th turn is greater than or equal to a preset first difference value threshold, and the absolute value of the second current difference at the nth setting position of the b2-th turn is greater than or equal to a preset first difference value threshold, and the second coarse positioning condition is that the absolute value of the sum of the first current difference value and the second current difference value is less than a preset second difference value threshold, and the second difference value threshold is less than the first difference value threshold.

[0015] In one embodiment, the method further includes:

[0016] Choose either the b1-th turn winding or the b2-th turn winding as the target winding. Among the absolute values ​​of all n current difference values ​​of the target winding, if the absolute value of the current difference value at the n1-th setting position is the largest and the absolute value of the current difference value at the n2-th setting position is the second largest, then it is determined that the inter-turn short circuit occurs between the n1-th and n2-th setting positions of the b1-th turn winding and the n1-th and n2-th setting positions of the b2-th turn winding; where 1≤n1≤N, 1≤n2≤N, and n1≠n2.

[0017] An inter-turn short-circuit detection device is applied to a reactor, the reactor comprising B turns of winding connected in parallel, each turn of winding having N current sensors spaced at intervals, the current sensors on different windings being positioned in the same way, the device comprising:

[0018] The current value acquisition module is used to acquire the current values ​​of all current sensors to obtain B*N current values;

[0019] The average current calculation module is used to calculate the average current value of the B-turn winding at the nth set position, so as to obtain N average current values; where 1≤n≤N;

[0020] The current difference value calculation module is used to calculate B current difference values ​​at the nth setting position based on all current values ​​and the average current value at the nth setting position, so as to obtain B*N current difference values; wherein, the current difference value is used to indicate the change of the current value at the same setting position compared with the average current value.

[0021] The inter-turn short circuit detection module is used to determine that there is no inter-turn short circuit if the absolute values ​​of all B*N current differences are less than a preset first difference threshold, and to determine that there is an inter-turn short circuit if at least one of the absolute values ​​of the B*N current differences is greater than or equal to the preset first difference threshold.

[0022] In one embodiment, the formula for calculating the current difference value is:

[0023]

[0024] In the above formula, Δi bn Indicates the current difference value at the nth setting position of the b-th turn, 1≤b≤B; i bn Indicates the current value at the nth setting position of the b-th turn, i avn Indicates the average current at the nth setting position.

[0025] In one embodiment, the device further includes:

[0026] A coarse positioning module is used to determine that an inter-turn short circuit occurs between the b1-turn winding and the b2-turn winding if the b1-turn winding and the b2-turn winding satisfy a first coarse positioning condition and a second coarse positioning condition; wherein, 1≤b1≤B, 1≤b2≤B, b1≠b2, the first coarse positioning condition is that the absolute value of the first current difference at the nth setting position of the b1-turn winding is greater than or equal to a preset first difference value threshold, and the absolute value of the second current difference at the nth setting position of the b2-turn winding is greater than or equal to the preset first difference value threshold, and the second coarse positioning condition is that the absolute value of the sum of the first current difference value and the second current difference value is less than a preset second difference value threshold, and the second difference value threshold is less than the first difference value threshold.

[0027] In one embodiment, the device further includes:

[0028] The precision positioning module is used to select either the b1-th turn winding or the b2-th turn winding as the target winding. Among the absolute values ​​of all n current difference values ​​of the target winding, if the absolute value of the current difference value at the n1-th setting position is the largest and the absolute value of the current difference value at the n2-th setting position is the second largest, then it is determined that the inter-turn short circuit occurs between the n1-th and n2-th setting positions of the b1-th turn winding and the n1-th and n2-th setting positions of the b2-th turn winding; where 1≤n1≤N, 1≤n2≤N, and n1≠n2.

[0029] A computer-readable storage medium storing a computer program, which, when executed by a processor, causes the processor to perform the steps of the above-described inter-turn short-circuit detection method.

[0030] An inter-turn short-circuit detection device includes a memory and a processor. The memory stores a computer program, which, when executed by the processor, causes the processor to perform the steps of the above-described inter-turn short-circuit detection method.

[0031] This invention provides a method, apparatus, medium, and device for detecting inter-turn short circuits. First, it calculates the current difference value based on the current values ​​acquired at various locations. Then, by comparing the absolute value of all current difference values ​​with a preset first difference threshold, it can determine whether an inter-turn short circuit exists. Compared to existing technologies, this invention determines the existence of inter-turn short circuits based on the more microscopic current difference values ​​at each location, thus enabling more timely detection of inter-turn short circuit problems. Attached Figure Description

[0032] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0033] in:

[0034] Figure 1 This is the experimental circuit diagram for the reactor;

[0035] Figure 2 A schematic diagram showing the current distribution corresponding to different short-circuit locations;

[0036] Figure 3 This is a flowchart illustrating the inter-turn short-circuit detection method.

[0037] Figure 4 This is a schematic diagram of the inter-turn short-circuit detection device;

[0038] Figure 5 This is a structural block diagram of an inter-turn short-circuit detection device. Detailed Implementation

[0039] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0040] The terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish different objects, not to describe a specific order. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to these processes, methods, products, or apparatuses.

[0041] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0042] To more clearly illustrate the technical solution of this invention, the principles upon which this invention is based will be briefly explained first:

[0043] like Figure 1 As shown, Figure 1 This is the experimental circuit diagram for the reactor. In this circuit diagram, the reactor consists of four parallel windings. L1-L4 represent the inductance of each winding, and the black dots represent the mutual inductance terminals between each pair of L1-L4. CH1-CH4 represent the four windings of the single-layer reactor; i1-i4 represent the current in the four windings; T1 is an autotransformer, and T2 is a current-boosting transformer. (T1 and T2) are high-current generators. During the experiment, the digital power unit needs to measure the currents i1-i4 of the four windings and the total current I when inter-turn short circuits occur at different locations F1, F2, F3, and F4 (only between windings 1 and 2).

[0044] Correspondingly, the distribution of current values ​​before and after a short circuit in each winding at different short-circuit locations is shown in the figure. Figure 2 .from Figure 2 As can be seen in:

[0045] (1) When a short circuit occurs between winding 1 and winding 2, the current will only be redistributed between winding 1 and winding 2.

[0046] (2) The current difference between winding 3 and winding 4 is always zero, and the current amplitude of each winding is exactly the same before and after the short circuit.

[0047] (3) When a short circuit occurs between windings 1 and 2, the current difference between windings 1 and 2 is the largest at the short circuit point F1, that is, the unbalanced current is the largest; the current difference between windings 1 and 2 is the smallest at the short circuit point F4, that is, the unbalanced current is the smallest; that is to say, the closer to the short circuit point, the larger the measured unbalanced current will be.

[0048] Based on the above principles, this invention proposes a method for detecting inter-turn short circuits. For example... Figure 3 As shown, Figure 3 This is a flowchart illustrating an inter-turn short-circuit detection method in one embodiment, applied to a reactor. Optionally, the reactor is a dry-type air-core reactor. The reactor includes B turns of winding in parallel, with N current sensors spaced apart on each turn. These current sensors are magnetically balanced Hall effect current sensors, which are ring-shaped and encircle each turn of the dry-type air-core reactor. The initial placement positions of the current sensors and the spacing between them are the same, thus ensuring that the current sensors on different windings are positioned identically. This invention recommends that N be between 4 and 6.

[0049] The steps provided by the inter-turn short-circuit detection method in this embodiment include:

[0050] S301, acquire the current values ​​of all current sensors to obtain B*N current values.

[0051] Understandably, because there are B turns of winding, and N current sensors on each turn, B*N current values ​​can be obtained. If the current values ​​on each turn of winding are grouped into a vector, then B vectors are formed, represented as:

[0052] I1=(i 11 i 12 ..., i 1N )

[0053] I2=(i 21 i 22 ..., i 2N )

[0054] ···

[0055] I B =(i B1 iB2 ..., i BN )

[0056] S302, calculate the average current value of B-turn winding at the nth setting position to obtain N average current values.

[0057] Where 1≤n≤N, that is, the same calculation operation is performed on all setting positions to obtain N average current values, expressed as:

[0058] i av1 =(i 11 +i 21 +···+i B1 ) / B

[0059] i av2 =(i 12 +i 22 +···+i B2 ) / B

[0060] ···

[0061] i avN =(i 1N +i 2N +···+i BN ) / B

[0062] S303, calculate B current difference values ​​at the nth setting position based on all current values ​​and the average current value at the nth setting position, so as to obtain B*N current difference values.

[0063] The current difference value indicates the magnitude of change in current value at the same location compared to the average current value. Optionally, this current difference value can be calculated based on the standard deviation or variance.

[0064] In one specific embodiment, the formula for calculating the current difference value is as follows:

[0065]

[0066] In the above formula, Δi bn Indicates the current difference value at the nth setting position of the b-th turn, 1≤b≤B; i bn Indicates the current value at the nth setting position of the b-th turn, i avn Indicates the average current at the nth setting position.

[0067] Furthermore, these B*N current difference values ​​can be grouped into a B×N matrix, represented as:

[0068]

[0069] S304. Compare the absolute values ​​of B*N current differences with a preset first difference threshold. If the absolute values ​​of all B*N current differences are less than the preset first difference threshold, then execute S305 to determine that there is no inter-turn short circuit; if at least one of the absolute values ​​of B*N current differences is greater than or equal to the preset first difference threshold, then execute S306 to determine that there is an inter-turn short circuit.

[0070] In other words, if the absolute values ​​of all B*N current differences are less than a preset first difference threshold, then it is considered that there is no unbalanced current and there is no inter-turn short circuit. If at least one of the absolute values ​​of B*N current differences is greater than or equal to the preset first difference threshold, then it is considered that there is an unbalanced current and there is no inter-turn short circuit. Optionally, the first difference threshold is set to 5%.

[0071] The aforementioned inter-turn short circuit detection method first calculates the current difference value based on the current values ​​at each setting location, and then determines whether an inter-turn short circuit exists by comparing the absolute value of all current difference values ​​with a preset first difference value threshold. Compared with the prior art, this invention determines the existence of inter-turn short circuits based on the more microscopic current difference values ​​at each setting location, thus enabling more timely detection of inter-turn short circuit problems.

[0072] In one specific implementation, in order to coarsely locate the fault point, the following steps are also performed: if the b1-th turn winding and the b2-th turn winding satisfy the first coarse location condition and the second coarse location condition, then it is determined that the inter-turn short circuit occurs between the b1-th turn winding and the b2-th turn winding.

[0073] Wherein, 1≤b1≤B, 1≤b2≤B, b1≠b2, the first coarse positioning condition is that the absolute value of the first current difference at the nth setting position of the b1th turn winding is greater than or equal to the preset first difference value threshold, and the absolute value of the second current difference at the nth setting position of the b2th turn winding is greater than or equal to the preset first difference value threshold, the second coarse positioning condition is that the absolute value of the sum of the first current difference value and the second current difference value is less than the preset second difference value threshold, and the second difference value threshold is less than the first difference value threshold.

[0074] For example, assuming B = 4 and N = 4, the calculated B*N current difference values ​​can be expressed as:

[0075]

[0076] If Δi 11 With Δi 12 The following conditions must be met:

[0077] |Δi 11 |≥Δ thre1, and |Δi 21 |≥Δ thre1

[0078] |Δi 11 +Δi 21 |<Δ thre2

[0079] it is determined that an inter-turn short circuit occurs between the 1st winding and the 2nd winding. Wherein, Δ thre1 is a first difference threshold, alternatively, let Δ thre1 =5%; Δ thre2 is a second difference threshold, alternatively, let Δ thre2 =1%.

[0080] Through the first rough positioning condition, which windings have an inter-turn short circuit can be positioned, and in combination with the second rough positioning condition, which two windings a specific inter-turn short circuit occurs between can be positioned (because current is only redistributed between these two windings).

[0081] In a specific implementation, for accurate positioning of a fault point, the following steps are further performed: selecting any one of the b1-th winding and the b2-th winding as a target winding, among the absolute values of all n current difference values of the target winding, if the absolute value of the current difference value at the n1-th setting position is the maximum value, and the absolute value of the current difference value at the n2-th setting position is the second maximum value, then it is determined that the inter-turn short circuit occurs between the n1-th setting position and the n2-th setting position of the b1-th winding and the n1-th setting position and the n2-th setting position of the b2-th winding.

[0082] Wherein, 1≤n1≤N, 1≤n2≤N, n1≠n2.

[0083] Continuing the discussion with the previous example, the first winding can be used as the target winding, among |Δi 11 |, |Δi 12 |, |Δi 13 |, |Δi 14 |, if |Δi 11 | is the maximum value, and |Δi 12 | is the second maximum value, then it can be determined that the inter-turn short circuit occurs between the first setting position and the second setting position of the first winding and the first setting position and the second setting position of the second winding.

[0084] This is because of the rule that the closer to the short-circuit point, the larger the measured unbalanced current is. |Δi 11 | is the maximum value, and |Δi 12The value | represents the second largest value, which is only measured when an inter-turn short circuit occurs between the first and second setting positions of the first turn winding. Since inter-turn short circuits always occur at the same setting position of both turns, either the first or second turn winding can be chosen as the target winding. Specifically, the location where the inter-turn short circuit occurs is between the first and second setting positions of the first turn winding and the first and second setting positions of the second turn winding.

[0085] Through the above specific embodiments, the present invention can achieve coarse and fine positioning of short-circuit points.

[0086] In one embodiment, such as Figure 4 As shown, an inter-turn short-circuit detection device is proposed and applied to a reactor. The reactor includes B turns of winding in parallel, and N current sensors are spaced apart on each turn of winding. The current sensors on different windings are positioned in the same way. The device includes:

[0087] The current value acquisition module 401 is used to acquire the current values ​​of all current sensors to obtain B*N current values;

[0088] The average current calculation module 402 is used to calculate the average current value of the B-turn winding at the nth set position, so as to obtain N average current values; where 1≤n≤N;

[0089] The current difference value calculation module 403 is used to calculate B current difference values ​​at the nth setting position based on all current values ​​and the average current value at the nth setting position, so as to obtain B*N current difference values; wherein, the current difference value is used to indicate the change of the current value at the same setting position compared with the average current value.

[0090] The inter-turn short circuit detection module 404 is used to determine that there is no inter-turn short circuit if the absolute values ​​of all B*N current differences are less than a preset first difference threshold, and to determine that there is an inter-turn short circuit if at least one of the absolute values ​​of B*N current differences is greater than or equal to the preset first difference threshold.

[0091] In one embodiment, the formula for calculating the current difference is:

[0092]

[0093] In the above formula, Δi bn Indicates the current difference value at the nth setting position of the b-th turn, 1≤b≤B; i bn Indicates the current value at the nth setting position of the b-th turn, i avn Indicates the average current at the nth setting position.

[0094] In one embodiment, the device further includes a coarse positioning module, configured to determine that an inter-turn short circuit occurs between the b1-turn winding and the b2-turn winding if the b1-turn winding and the b2-turn winding satisfy a first coarse positioning condition and a second coarse positioning condition; wherein, 1≤b1≤B, 1≤b2≤B, b1≠b2, the first coarse positioning condition is that the absolute value of the first current difference at the nth setting position of the b1-turn winding is greater than or equal to a preset first difference value threshold, and the absolute value of the second current difference at the nth setting position of the b2-turn winding is greater than or equal to the preset first difference value threshold, and the second coarse positioning condition is that the absolute value of the sum of the first current difference value and the second current difference value is less than a preset second difference value threshold, and the second difference value threshold is less than the first difference value threshold.

[0095] In one embodiment, the device further includes: a precision positioning module, configured to select either the b1-turn winding or the b2-turn winding as the target winding, and among the absolute values ​​of all n current difference values ​​of the target winding, if the absolute value of the current difference value at the n1-th setting position is the largest value and the absolute value of the current difference value at the n2-th setting position is the second largest value, then it is determined that the inter-turn short circuit occurs between the n1-th and n2-th setting positions of the b1-turn winding and the n1-th and n2-th setting positions of the b2-turn winding; wherein, 1≤n1≤N, 1≤n2≤N, and n1≠n2.

[0096] Figure 5 An internal structural diagram of an inter-turn short-circuit detection device in one embodiment is shown. Figure 5 As shown, the inter-turn short-circuit detection device includes a processor, a memory, and a network interface connected via a system bus. The memory includes a non-volatile storage medium and internal memory. The non-volatile storage medium stores an operating system and may also store a computer program. When executed by the processor, this computer program enables the processor to implement the inter-turn short-circuit detection method. The internal memory may also store a computer program, which, when executed by the processor, enables the processor to perform the inter-turn short-circuit detection method. Those skilled in the art will understand that… Figure 5 The structure shown is merely a block diagram of a portion of the structure related to the present application and does not constitute a limitation on the inter-turn short-circuit detection device to which the present application is applied. The specific inter-turn short-circuit detection device may include more or fewer components than shown in the figure, or combine certain components, or have different component arrangements.

[0097] A computer-readable storage medium storing a computer program, which, when executed by a processor, performs the following steps: acquiring current values ​​from all current sensors to obtain B*N current values; calculating the average current value of B turns of winding at an nth setting position to obtain N average current values; wherein 1 ≤ n ≤ N; calculating B current difference values ​​at the nth setting position based on all current values ​​and the average current values, to obtain B*N current difference values; wherein the current difference values ​​are used to indicate the magnitude of change of the current value at the same setting position relative to the average current value; if the absolute values ​​of all B*N current difference values ​​are less than a preset first difference value threshold, it is determined that there is no inter-turn short circuit; if at least one of the absolute values ​​of the B*N current difference values ​​is greater than or equal to the preset first difference value threshold, it is determined that there is an inter-turn short circuit.

[0098] An inter-turn short circuit detection device includes a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, it performs the following steps: acquiring current values ​​from all current sensors to obtain B*N current values; calculating the average current value of B turns at a set position to obtain N average current values; where 1 ≤ n ≤ N; calculating B current difference values ​​at the nth set position based on all current values ​​and the average current values ​​to obtain B*N current difference values; wherein the current difference values ​​indicate the magnitude of change of the current value at the same set position relative to the average current value; if the absolute values ​​of all B*N current difference values ​​are less than a preset first difference value threshold, it is determined that there is no inter-turn short circuit; if at least one of the absolute values ​​of the B*N current difference values ​​is greater than or equal to the preset first difference value threshold, it is determined that there is an inter-turn short circuit.

[0099] It should be noted that the above-mentioned inter-turn short circuit detection method, apparatus, device, and computer-readable storage medium belong to the same general inventive concept, and the contents of the embodiments of the inter-turn short circuit detection method, apparatus, device, and computer-readable storage medium are applicable to each other.

[0100] Those skilled in the art will understand that all or part of the processes in the methods of the above embodiments can be implemented by a computer program instructing related hardware. This program can be stored in a non-volatile computer-readable storage medium, and when executed, it can include the processes of the embodiments of the above methods. Any references to memory, storage, databases, or other media used in the embodiments provided in this application can include non-volatile and / or volatile memory. Non-volatile memory may include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM), or flash memory. Volatile memory may include random access memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in various forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), dual data rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous link DRAM (SLDRAM), RAMbus direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and RAMbus dynamic RAM (RDRAM), etc.

[0101] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0102] The above embodiments merely illustrate several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of this patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A method for detecting inter-turn short circuits, characterized in that, The method, applied to a reactor comprising B turns of winding connected in parallel, wherein each turn of winding has N current sensors spaced at intervals, and the current sensors on different windings are positioned in the same location, includes: Obtain the current values ​​of all current sensors to obtain B*N current values; Calculate the average current value of the B-turn winding at the nth setting position to obtain N average current values; where 1≤n≤N; Based on all current values ​​and the average current value at the nth setting position, calculate B current difference values ​​at the nth setting position to obtain B*N current difference values; wherein, the current difference values ​​are used to indicate the magnitude of change of the current value at the same setting position compared to the average current value. If the absolute values ​​of all B*N current differences are less than a preset first difference threshold, it is determined that there is no inter-turn short circuit. If at least one of the absolute values ​​of the B*N current differences is greater than or equal to the preset first difference threshold, it is determined that there is an inter-turn short circuit.

2. The method according to claim 1, characterized in that, The formula for calculating the current difference is: In the above formula, Δi bn Indicates the current difference value at the nth setting position of the b-th turn, 1≤b≤B; i bn Indicates the current value at the nth setting position of the b-th turn, i avn Indicates the average current at the nth setting position.

3. The method according to claim 1, characterized in that, The method further includes: If the b1-th turn and the b2-th turn satisfy the first coarse positioning condition and the second coarse positioning condition, then it is determined that the inter-turn short circuit occurs between the b1-th turn and the b2-th turn; wherein, 1≤b1≤B, 1≤b2≤B, b1≠b2, the first coarse positioning condition is that the absolute value of the first current difference at the nth setting position of the b1-th turn is greater than or equal to a preset first difference value threshold, and the absolute value of the second current difference at the nth setting position of the b2-th turn is greater than or equal to a preset first difference value threshold, and the second coarse positioning condition is that the absolute value of the sum of the first current difference value and the second current difference value is less than a preset second difference value threshold, and the second difference value threshold is less than the first difference value threshold.

4. The method according to claim 3, characterized in that, The method further includes: Choose either the b1-th turn winding or the b2-th turn winding as the target winding. Among the absolute values ​​of all n current difference values ​​of the target winding, if the absolute value of the current difference value at the n1-th setting position is the largest and the absolute value of the current difference value at the n2-th setting position is the second largest, then it is determined that the inter-turn short circuit occurs between the n1-th and n2-th setting positions of the b1-th turn winding and the n1-th and n2-th setting positions of the b2-th turn winding; where 1≤n1≤N, 1≤n2≤N, and n1≠n2.

5. A turn-to-turn short-circuit detection device, characterized in that, Applied to a reactor, the reactor comprising B turns of winding connected in parallel, each turn having N current sensors spaced at intervals, the current sensors on different windings being positioned identically, the device comprising: The current value acquisition module is used to acquire the current values ​​of all current sensors to obtain B*N current values; The average current calculation module is used to calculate the average current value of the B-turn winding at the nth set position, so as to obtain N average current values; where 1≤n≤N; The current difference value calculation module is used to calculate B current difference values ​​at the nth setting position based on all current values ​​and the average current value at the nth setting position, so as to obtain B*N current difference values; wherein, the current difference value is used to indicate the change of the current value at the same setting position compared with the average current value. The inter-turn short circuit detection module is used to determine that there is no inter-turn short circuit if the absolute values ​​of all B*N current differences are less than a preset first difference threshold, and to determine that there is an inter-turn short circuit if at least one of the absolute values ​​of the B*N current differences is greater than or equal to the preset first difference threshold.

6. The inter-turn short-circuit detection device according to claim 5, characterized in that, The formula for calculating the current difference is: In the above formula, Δi bn Indicates the current difference value at the nth setting position of the b-th turn, 1≤b≤B; i bn Indicates the current value at the nth setting position of the b-th turn, i avn Indicates the average current at the nth setting position.

7. The inter-turn short-circuit detection device according to claim 5, characterized in that, The device further includes: A coarse positioning module is used to determine that an inter-turn short circuit occurs between the b1-turn winding and the b2-turn winding if the b1-turn winding and the b2-turn winding satisfy a first coarse positioning condition and a second coarse positioning condition; wherein, 1≤b1≤B, 1≤b2≤B, b1≠b2, the first coarse positioning condition is that the absolute value of the first current difference at the nth setting position of the b1-turn winding is greater than or equal to a preset first difference value threshold, and the absolute value of the second current difference at the nth setting position of the b2-turn winding is greater than or equal to the preset first difference value threshold, and the second coarse positioning condition is that the absolute value of the sum of the first current difference value and the second current difference value is less than a preset second difference value threshold, and the second difference value threshold is less than the first difference value threshold.

8. The inter-turn short-circuit detection device according to claim 7, characterized in that, The device further includes: The precision positioning module is used to select either the b1-th turn winding or the b2-th turn winding as the target winding. Among the absolute values ​​of all n current difference values ​​of the target winding, if the absolute value of the current difference value at the n1-th setting position is the largest and the absolute value of the current difference value at the n2-th setting position is the second largest, then it is determined that the inter-turn short circuit occurs between the n1-th and n2-th setting positions of the b1-th turn winding and the n1-th and n2-th setting positions of the b2-th turn winding; where 1≤n1≤N, 1≤n2≤N, and n1≠n2.

9. A computer-readable storage medium, characterized in that, The device stores a computer program that, when executed by a processor, causes the processor to perform the steps of the method as described in any one of claims 1 to 4.

10. A turn-to-turn short-circuit detection device, characterized in that, It includes a memory and a processor, the memory storing a computer program that, when executed by the processor, causes the processor to perform the steps of the method as described in any one of claims 1 to 4.

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