Locating method, device and equipment for partial discharge in substation switch cabinet and storage medium

Abstract

The invention discloses a partial discharge positioning method, device and equipment in a transformer substation switch cabinet and a storage medium, and relates to the technical field of transformer substation monitoring, and the method comprises the steps: obtaining a first time difference and a second time difference of an electromagnetic wave signal and an ultrasonic signal received by a first acoustoelectric combined partial discharge sensor and a second acoustoelectric combined partial discharge sensor respectively; according to the first time difference, the second time difference, the electromagnetic wave signal transmission rate and the ultrasonic wave signal transmission rate, determining a first distance between the first acoustoelectric joint partial discharge sensor and the fault position and a second distance between the second acoustoelectric joint partial discharge sensor and the fault position; in a plane coordinate graph of the switch cabinet, determining a projection point of the fault position in the switch cabinet according to the position of the first acoustoelectric joint partial discharge sensor, the position of the second acoustoelectric joint partial discharge sensor, the first distance and the second distance; and determining a fault position according to the projection point. According to the invention, partial discharge in the substation switch cabinet can be rapidly and accurately positioned.

Description

Technical Field

[0001] The present invention relates to the technical field of substation monitoring, and in particular to a method, device, equipment and storage medium for locating partial discharge in a substation switch cabinet. Background Art

[0002] Substation operation and maintenance refers to the operation and maintenance of electrical equipment within a substation to ensure its safe, stable, and efficient operation. Currently, high-voltage switchgear failure rates are high during substation operation and maintenance. Industry reports and statistics indicate that high-voltage switchgear is one of the most prone to failures within a substation, accounting for 30% to 50% of the overall failure rate of substation equipment.

[0003] Currently, substation equipment status management and status monitoring operations rely heavily on manual labor. Given the severely insufficient manpower-to-station ratio in existing substations, overdue work and missed inspections are inevitable. In existing technologies, when monitoring high-voltage switchgear, if monitoring data, such as partial discharge data, is affected by external interference sources, it can easily cause data anomalies, making it impossible to accurately determine the specific location of the interference source within the substation, thus hindering personnel's ability to locate and eliminate the interference source. Summary of the Invention

[0004] The present invention provides a method, device, equipment and storage medium for locating partial discharge in a transformer substation switch cabinet, which solves the problem in the prior art that partial discharge in a transformer substation switch cabinet cannot be located quickly and accurately.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions: In a first aspect, the present invention provides a method for locating partial discharge in a substation switch cabinet, comprising a processor, and a first acoustic-electric combined partial discharge sensor and a second acoustic-electric combined partial discharge sensor disposed in each switch cabinet and connected to the processor; the first acoustic-electric combined partial discharge sensor and the second acoustic-electric combined partial discharge sensor are both used to collect electromagnetic wave signals and ultrasonic signals emitted from the fault location; the method is applied to the processor, and the method comprises: Respectively obtaining a first time difference between when the first acoustic-electric combined partial discharge sensor receives the electromagnetic wave signal and the ultrasonic signal, and a second time difference between when the second acoustic-electric combined partial discharge sensor receives the electromagnetic wave signal and the ultrasonic signal; Determining a first distance between the first acoustic-electric combined partial discharge sensor and the fault location, and a second distance between the second acoustic-electric combined partial discharge sensor and the fault location, based on the first time difference, the second time difference, the transmission rate of the electromagnetic wave signal, and the transmission rate of the ultrasonic signal; In the plane coordinate diagram of the switch cabinet, a projection point of the fault position in the switch cabinet is determined based on the position of the first combined acoustic-electric partial discharge sensor, the position of the second combined acoustic-electric partial discharge sensor, the first distance, and the second distance; the projection point is located on a line connecting the first combined acoustic-electric partial discharge sensor and the second combined acoustic-electric partial discharge sensor; The fault location is determined according to the projection point.

[0006] In a possible implementation, determining the projection point of the fault location within the switch cabinet based on the position of the first combined acoustic-electric partial discharge sensor, the position of the second combined acoustic-electric partial discharge sensor, the first distance, and the second distance in the plane coordinate diagram of the switch cabinet specifically includes: In the plane coordinate diagram of the switch cabinet, a first position coordinate is determined according to the position of the first acoustic-electric combined partial discharge sensor, and a second position coordinate is determined according to the position of the second acoustic-electric combined partial discharge sensor; In combination with the straight line equation and the projection theorem, the projection point of the fault position in the switch cabinet is determined according to the first position coordinate, the second position coordinate, the first distance, and the second distance.

[0007] In one possible implementation, combining a straight line equation with the projection theorem to determine the projection point of the fault location within the switch cabinet according to the first position coordinate, the second position coordinate, the first distance, and the second distance specifically includes: According to the projection theorem, the ratio of the first distance to the second distance is equal to the distance between the first acoustic-electric combined partial discharge sensor and the projection point and the distance between the second acoustic-electric combined partial discharge sensor and the projection point. The first position coordinate and the second position coordinate are combined to obtain a first equation. The equation of the straight line passing through the first position coordinate and the second position coordinate is used as the second equation; The first equation and the second equation are solved together to obtain the coordinates of the projection point of the fault position in the switch cabinet.

[0008] In a possible implementation, the first position coordinates are represented by (x1, y1), the second position coordinates are represented by (x2, y2), and the coordinates of the projection point are represented by (x, y); the first equation is specifically: ; The second equation is specifically: ; Here, s1 represents the first distance, and s2 represents the second distance.

[0009] In one possible implementation, determining a first distance between the first acoustic-electric combined partial discharge sensor and the fault location, and a second distance between the second acoustic-electric combined partial discharge sensor and the fault location, based on the first time difference, the second time difference, the transmission rate of the electromagnetic wave signal, and the transmission rate of the ultrasonic signal, specifically includes: Determining a first distance between the first acoustic-electric combined partial discharge sensor and the fault location based on the first time difference, the transmission rate of the electromagnetic wave signal, and the transmission rate of the ultrasonic signal; A second distance between the second acoustic-electric combined partial discharge sensor and the fault location is determined according to the second time difference, the transmission rate of the electromagnetic wave signal, and the transmission rate of the ultrasonic signal.

[0010] In a possible implementation, the fault location information is determined according to the projection point, specifically as follows: The fault location information is determined based on the position of the first combined acoustic and electrical partial discharge sensor, the position of the projection point, and the first distance, or the fault location information is determined based on the position of the second combined acoustic and electrical partial discharge sensor, the position of the projection point, and the second distance.

[0011] In one possible implementation, a line between the fault location and the projection point is perpendicular to a line between the first acoustic-electric combined partial discharge sensor and the second acoustic-electric combined partial discharge sensor; and determining the fault location information based on the position of the first acoustic-electric combined partial discharge sensor, the position of the projection point, and the first distance specifically includes: determining a third distance from the first acoustic-electric combined partial discharge sensor to the projection point based on the position of the first acoustic-electric combined partial discharge sensor and the position of the projection point; determining a fourth distance between the fault location and the projection point based on the third distance and the first distance; The fault location is determined according to the projection point and the fourth distance.

[0012] In a possible implementation, the plane coordinate diagram of the switch cabinet stores device layout information of the switch cabinet; after determining the fault location according to the projection point, the method further includes: In the plane coordinate diagram of the switch cabinet, the faulty component is determined by combining the component layout information of the switch cabinet and the fault location.

[0013] In a possible implementation, after determining the failed component, the method further includes: Generates corresponding cabinet partial discharge abnormality alarm information based on the determined faulty device.

[0014] In a second aspect, the present invention provides a device for locating partial discharges in a substation switch cabinet, comprising a processor, and a first acoustic-electric combined partial discharge sensor and a second acoustic-electric combined partial discharge sensor disposed in each switch cabinet and connected to the processor; the first acoustic-electric combined partial discharge sensor and the second acoustic-electric combined partial discharge sensor are both used to collect electromagnetic wave signals and ultrasonic signals emitted from the fault location; the device is applied to the processor, and the device comprises: a first processing module, configured to respectively obtain a first time difference between when the first acoustic-electric combined partial discharge sensor receives the electromagnetic wave signal and the ultrasonic signal, and a second time difference between when the second acoustic-electric combined partial discharge sensor receives the electromagnetic wave signal and the ultrasonic signal; a second processing module, configured to determine a first distance between the first acoustic-electric combined partial discharge sensor and the fault location, and a second distance between the second acoustic-electric combined partial discharge sensor and the fault location based on the first time difference, the second time difference, the transmission rate of the electromagnetic wave signal, and the transmission rate of the ultrasonic signal; a third processing module, configured to determine, in the plane coordinate diagram of the switch cabinet, a projection point of the fault location within the switch cabinet based on the position of the first combined acoustic-electric partial discharge sensor, the position of the second combined acoustic-electric partial discharge sensor, the first distance, and the second distance; the projection point being located on a line connecting the first combined acoustic-electric partial discharge sensor and the second combined acoustic-electric partial discharge sensor; The fourth processing module is used to determine the fault location according to the projection point.

[0015] In a possible implementation, the third processing module is specifically configured to execute: In the plane coordinate diagram of the switch cabinet, a first position coordinate is determined according to the position of the first acoustic-electric combined partial discharge sensor, and a second position coordinate is determined according to the position of the second acoustic-electric combined partial discharge sensor; In combination with the straight line equation and the projection theorem, the projection point of the fault position in the switch cabinet is determined according to the first position coordinate, the second position coordinate, the first distance, and the second distance.

[0016] In one possible implementation, when determining the projection point of the fault location within the switchgear based on the first position coordinate, the second position coordinate, the first distance, and the second distance in combination with a straight line equation and a projection theorem, the third processing module is specifically configured to execute: According to the projection theorem, the ratio of the first distance to the second distance is equal to the distance between the first acoustic-electric combined partial discharge sensor and the projection point and the distance between the second acoustic-electric combined partial discharge sensor and the projection point. The first position coordinate and the second position coordinate are combined to obtain a first equation. The equation of the straight line passing through the first position coordinate and the second position coordinate is used as the second equation; The first equation and the second equation are solved together to obtain the coordinates of the projection point of the fault position in the switch cabinet.

[0017] In a possible implementation, in the third processing module, the first position coordinates are represented by (x1, y1), the second position coordinates are represented by (x2, y2), and the coordinates of the projection point are represented by (x, y); and the first equation is specifically configured as: ; The second equation is specifically configured as: ; Here, s1 represents the first distance, and s2 represents the second distance.

[0018] In a possible implementation, the second processing module is specifically configured to execute: Determining a first distance between the first acoustic-electric combined partial discharge sensor and the fault location based on the first time difference, the transmission rate of the electromagnetic wave signal, and the transmission rate of the ultrasonic signal; A second distance between the second acoustic-electric combined partial discharge sensor and the fault location is determined according to the second time difference, the transmission rate of the electromagnetic wave signal, and the transmission rate of the ultrasonic signal.

[0019] In a possible implementation, the fourth processing module is specifically configured to execute: The fault location information is determined based on the position of the first combined acoustic and electrical partial discharge sensor, the position of the projection point, and the first distance, or the fault location information is determined based on the position of the second combined acoustic and electrical partial discharge sensor, the position of the projection point, and the second distance.

[0020] In one possible implementation, a line between the fault location and the projection point is perpendicular to a line between the first acoustic-electric combined partial discharge sensor and the second acoustic-electric combined partial discharge sensor; and when determining the fault location information based on the position of the first acoustic-electric combined partial discharge sensor, the position of the projection point, and the first distance, the fourth processing module is specifically configured to execute: determining a third distance from the first acoustic-electric combined partial discharge sensor to the projection point based on the position of the first acoustic-electric combined partial discharge sensor and the position of the projection point; determining a fourth distance between the fault location and the projection point based on the third distance and the first distance; The fault location is determined according to the projection point and the fourth distance.

[0021] In one possible implementation, the apparatus further includes a fifth processing module; the plane coordinate diagram of the switch cabinet stores device layout information of the switch cabinet; after determining the fault location according to the projection point, the fifth processing module is specifically configured to execute: In the plane coordinate diagram of the switch cabinet, the faulty component is determined by combining the component layout information of the switch cabinet and the fault location.

[0022] In a possible implementation, the apparatus further includes a sixth processing module; after determining the failed component, the sixth processing module is specifically configured to execute: Generates corresponding cabinet partial discharge abnormality alarm information based on the determined faulty device.

[0023] In a third aspect, the present invention provides an electronic device comprising a processor and a memory, wherein the memory stores at least one instruction, at least one program, a code set or an instruction set, and the at least one instruction, the at least one program, the code set or the instruction set is loaded and executed by the processor to implement the method for locating partial discharge in a substation switch cabinet as described in any one of the above items.

[0024] In a fourth aspect, the present invention provides a computer-readable storage medium, which stores at least one instruction, at least one program, a code set or an instruction set. The at least one instruction, the at least one program, the code set or the instruction set is loaded and executed by a processor to implement the method for locating partial discharge in a substation switch cabinet as described in any one of the above items.

[0025] The method for locating partial discharge in a transformer substation switch cabinet provided by an embodiment of the present invention is applied in practice. First, a first time difference between an electromagnetic wave signal and an ultrasonic signal emitted by a fault location is received by a first acoustic-electric combined partial discharge sensor, and a second time difference between an electromagnetic wave signal and an ultrasonic signal is received by a second acoustic-electric combined partial discharge sensor. Second, a first distance between the first acoustic-electric combined partial discharge sensor and the fault location and a second distance between the second acoustic-electric combined partial discharge sensor and the fault location are calculated based on the first time difference, the second time difference, the transmission rate of the electromagnetic wave signal, and the transmission rate of the ultrasonic signal. Third, a projection point of the fault location in the switch cabinet is determined based on the position of the first acoustic-electric combined partial discharge sensor, the position of the second acoustic-electric combined partial discharge sensor, the first distance, and the second distance. Finally, the fault location is determined based on the position of the projection point. The present invention deploys the first acoustic-electric combined partial discharge sensor and the second acoustic-electric combined partial discharge sensor in the transformer substation cabinet, and adopts an acoustic-electric combined method to quickly and accurately locate the discharge source in the switch cabinet, making it convenient for operation and maintenance personnel to quickly and accurately locate the fault point, thereby reducing the equipment operation and maintenance workload of grassroots business personnel, improving operation and maintenance efficiency, and ensuring the reliability of power supply services. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 A flowchart of the steps of a method for locating partial discharge in a substation switch cabinet provided by an embodiment of the present invention; Figure 2 A plane coordinate diagram of a switch cabinet in a method for locating partial discharge in a substation switch cabinet provided by an embodiment of the present invention; Figure 3 This is a structural block diagram of a partial discharge locating device in a substation switch cabinet provided by an embodiment of the present invention.

[0027] Reference numerals and descriptions: 11. First acoustic-electric combined partial discharge sensor; 12. Second acoustic-electric combined partial discharge sensor; 13. Fault location; 14. Projection point; 31. Cart room; 32. Busbar room; 33. Cable room; 331. Current transformer; 332. Outgoing line contact; 333. Earthing switch; 334. Line arrester; 34. Instrument room. DETAILED DESCRIPTION

[0028] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0029] In the following, the terms "first" and "second" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present disclosure, unless otherwise specified, "multiple" means two or more. In addition, the use of "based on" or "according to" means openness and inclusiveness, because the process, steps, calculations or other actions "based on" or "according to" one or more of the conditions or values may be based on additional conditions or values beyond the stated in practice.

[0030] In order to solve the problem in the prior art that partial discharges in substation switch cabinets cannot be located quickly and accurately, embodiments of the present invention provide a method, apparatus, device, and storage medium for locating partial discharges in substation switch cabinets.

[0031] like Figure 1 As shown, in its first aspect, the present invention provides a method for locating partial discharges in a substation switchgear, comprising a processor, and first and second acoustic-electric combined partial discharge sensors, each disposed within the switchgear and connected to the processor. The first and second acoustic-electric combined partial discharge sensors are each configured to collect electromagnetic and ultrasonic signals emitted from the fault location.

[0032] The embodiment of the present invention provides a method for locating partial discharge in a substation switch cabinet, including: Step 101: respectively obtain a first time difference between an electromagnetic wave signal and an ultrasonic signal received by a first acoustic-electric combined partial discharge sensor, and a second time difference between an electromagnetic wave signal and an ultrasonic signal received by a second acoustic-electric combined partial discharge sensor.

[0033] A combined acoustic and electrical partial discharge sensor is a device used to detect partial discharge (PD) within electrical equipment, such as transformers or circuit breakers. PD refers to localized discharges within or on the surface of insulating materials. While this type of discharge typically doesn't cause immediate equipment failure, if left uncontrolled and untreated, it can lead to insulation degradation over time, ultimately causing equipment failure.

[0034] The acoustic-electric combined partial discharge sensor can capture the weak signals generated by partial discharge, including electromagnetic wave signals and ultrasonic signals.

[0035] When abnormalities in the switchgear are detected, the switchgear is located to detect PD data errors. When abnormal PD occurs, the fault location emits ultrasonic and electromagnetic waves.

[0036] The transmission speed of electromagnetic waves is relatively fast, which is the speed of light; while the transmission speed of ultrasonic waves is relatively slow, that is, the speed at which sound propagates in the air, which can be taken as 340m / s for calculation.

[0037] When a partial discharge occurs at the fault location, both ultrasonic and electromagnetic signals are emitted simultaneously. Because ultrasonic and electromagnetic signals travel at different speeds in the medium, there's a time difference between the ultrasonic and electromagnetic signals being received by the combined acoustic-electrical partial discharge sensor.

[0038] Electromagnetic wave signals travel faster, so the combined AE PD sensor receives the electromagnetic wave signal first, followed by the ultrasonic signal. Since the ultrasonic and electromagnetic wave signals arrive at each AE PD sensor at different times, the time difference between the two signals reaching the sensor can be calculated.

[0039] Specifically, multiple acoustic-electric combined partial discharge sensors are deployed inside the switch cabinet to collect ultrasonic and electromagnetic wave signals. There are no further restrictions on the number and locations of the acoustic-electric combined partial discharge sensors.

[0040] The first time difference is determined based on the first time when the first acoustic-electric combined partial discharge sensor receives the electromagnetic wave signal and the second time when it receives the ultrasonic signal; the second time difference is determined based on the third time when the second acoustic-electric combined partial discharge sensor receives the electromagnetic wave signal and the fourth time when it receives the ultrasonic signal.

[0041] Taking the first acoustic-electric combined partial discharge sensor as an example, the first time when the first acoustic-electric combined partial discharge sensor receives the electromagnetic wave signal is represented by t1, and the second time when it receives the ultrasonic signal is represented by t2; the first time difference between the electromagnetic wave signal and the ultrasonic signal is t2-t1. In this embodiment, the first time difference is represented by Δt.

[0042] Step 102: Determine a first distance between the first acoustic-electric combined partial discharge sensor and the fault location, and a second distance between the second acoustic-electric combined partial discharge sensor and the fault location based on the first time difference, the second time difference, the transmission rate of the electromagnetic wave signal, and the transmission rate of the ultrasonic signal.

[0043] Specifically, when the transmission speed of the electromagnetic wave signal, the transmission speed of the ultrasonic signal, and the time difference between the electromagnetic wave signal and the ultrasonic signal received by the acoustic-electric combined partial discharge sensor are known, the distance between the acoustic-electric combined partial discharge sensor and the fault location can be calculated according to the speed formula.

[0044] In this embodiment of the present invention, the calculation of the first distance between the first combined acoustic and electric PD sensor and the fault location is used as an example: the transmission speed of the electromagnetic wave signal is represented by v1, and the transmission speed of the ultrasonic signal is represented by v2. Assuming that the distance between the fault location and the first combined acoustic and electric PD sensor is S1, according to the velocity formula, S1 / v1 = t1, S1 / v2 = t2, and therefore Δt = t2 - t1 = S1 / v2 - S1 / v1.

[0045] From the above, we can see that when Δt, v2 and v1 are all known, the value of S1 can be calculated.

[0046] Step 103 : In the plane coordinate diagram of the switch cabinet, determine the projection point of the fault position in the switch cabinet according to the position of the first combined acoustic and electrical partial discharge sensor, the position of the second combined acoustic and electrical partial discharge sensor, the first distance, and the second distance.

[0047] The projection point is located on a line connecting the first acoustic-electric combined partial discharge sensor and the second acoustic-electric combined partial discharge sensor.

[0048] Specifically, in the plane coordinate diagram of the switch cabinet, the position coordinates of the first acoustic-electric combined partial discharge sensor and the position coordinates of the second acoustic-electric combined partial discharge sensor are known; the first distance between the first acoustic-electric combined partial discharge sensor and the fault location and the second distance between the second acoustic-electric combined partial discharge sensor and the fault location are known and have been calculated in step 103. According to the projection theorem, the position coordinates of the projection point can be calculated.

[0049] Step 104: Determine the fault location based on the projection point.

[0050] Specifically, in the plane coordinate diagram of the switch cabinet, the position coordinates of the first acoustic-electric combined partial discharge sensor and the second acoustic-electric combined partial discharge sensor are known, and the position coordinates of the projection point are also known; according to the properties of the projection, the straight line between the fault position and the projection point is perpendicular to the straight line between the first acoustic-electric combined partial discharge sensor and the second acoustic-electric combined partial discharge sensor. Therefore, the position coordinates of the fault position can be calculated based on trigonometric functions.

[0051] In actual application, the method for locating partial discharge in a substation switch cabinet provided by an embodiment of the present invention first obtains a first time difference between an electromagnetic wave signal and an ultrasonic signal emitted from a fault location received by a first acoustic-electric combined partial discharge sensor, and a second time difference between an electromagnetic wave signal and an ultrasonic signal received by a second acoustic-electric combined partial discharge sensor; secondly, based on the first time difference, the second time difference, the transmission rate of the electromagnetic wave signal, and the transmission rate of the ultrasonic signal, a first distance between the first acoustic-electric combined partial discharge sensor and the fault location, and a second distance between the second acoustic-electric combined partial discharge sensor and the fault location are calculated; thirdly, in a plane coordinate diagram of the switch cabinet, a projection point of the fault location in the switch cabinet is determined based on the position of the first acoustic-electric combined partial discharge sensor, the position of the second acoustic-electric combined partial discharge sensor, the first distance, and the second distance; finally, the fault location is determined based on the position of the projection point.

[0052] The present invention deploys a first acoustic-electric combined partial discharge sensor and a second acoustic-electric combined partial discharge sensor in the substation cabinet, and adopts an acoustic-electric combined method to quickly and accurately locate the discharge source in the switch cabinet, making it convenient for operation and maintenance personnel to quickly and accurately locate the fault point, thereby reducing the equipment operation and maintenance workload of grassroots business personnel, improving operation and maintenance efficiency, and ensuring the reliability of power supply services.

[0053] Optionally, in the plane coordinate diagram of the switch cabinet, the projection point of the fault location in the switch cabinet is determined according to the position of the first acoustic-electric combined partial discharge sensor, the position of the second acoustic-electric combined partial discharge sensor, the first distance, and the second distance, specifically: In the plane coordinate diagram of the switch cabinet, the first position coordinate is determined according to the position of the first acoustic-electric combined partial discharge sensor, and the second position coordinate is determined according to the position of the second acoustic-electric combined partial discharge sensor.

[0054] Combining the straight line equation with the projection theorem, the projection point of the fault position in the switch cabinet is determined according to the first position coordinate, the second position coordinate, the first distance, and the second distance.

[0055] like Figure 2 As shown, a first acoustic-electric combined partial discharge sensor 11 and a second acoustic-electric combined partial discharge sensor 12 are respectively deployed on the right side wall of the switch cabinet. The present invention does not specifically limit the specific layout positions of the first acoustic-electric combined partial discharge sensor 11 and the second acoustic-electric combined partial discharge sensor 12 in the switch cabinet.

[0056] In this embodiment of the present invention, the switch cabinet further includes a trolley compartment 31, a busbar compartment 32, a cable compartment 33, and an instrument compartment 34. The first acoustic-electric combined partial discharge sensor 11 is deployed in the instrument compartment 34, and the second acoustic-electric combined partial discharge sensor 12 is deployed in the cable compartment 33.

[0057] The cable chamber 33 also includes a current transformer 331 , an outgoing contact 332 , a grounding switch 333 and a line lightning arrester 334 .

[0058] Optionally, combining the straight line equation and the projection theorem, determining the projection point 14 of the fault position in the switch cabinet according to the first position coordinate, the second position coordinate, the first distance, and the second distance specifically includes: According to the projection theorem, the ratio of the first distance to the second distance is equal to the distance between the first acoustic-electric combined partial discharge sensor 11 and the projection point 14 and the distance between the second acoustic-electric combined partial discharge sensor 12 and the projection point 14. Combining the first position coordinate and the second position coordinate, a first equation is obtained. The equation of the straight line passing through the first position coordinate and the second position coordinate is used as the second equation; By solving the first equation and the second equation simultaneously, the coordinates of the projection point 14 of the fault position in the switch cabinet are obtained.

[0059] Optionally, the first position coordinate is represented by (x1, y1), the second position coordinate is represented by (x2, y2), and the coordinate of the projection point 14 is represented by (x, y); the first equation is specifically: ; The second equation is specifically: ; Here, s1 represents the first distance, and s2 represents the second distance.

[0060] According to this embodiment, in the plane coordinate diagram of the switch cabinet, when the line connecting the first acoustic-electric combined partial discharge sensor 11 and the second acoustic-electric combined partial discharge sensor 12 in the coordinate system of the plane coordinate diagram is parallel to the y-axis of the coordinate system, so that x-x1 and x2-x1 are both 0, the first equation can be simplified to: ; The coordinates of the projection point 14 are determined in this way.

[0061] Optionally, determining a first distance between the first acoustic-electric combined partial discharge sensor 11 and the fault location 13 and a second distance between the second acoustic-electric combined partial discharge sensor 12 and the fault location 13 based on the first time difference, the second time difference, the transmission rate of the electromagnetic wave signal, and the transmission rate of the ultrasonic signal specifically includes: Determine a first distance between the first acoustic-electric combined partial discharge sensor 11 and the fault location 13 according to the first time difference, the transmission rate of the electromagnetic wave signal, and the transmission rate of the ultrasonic signal; The second distance between the second acoustic-electric combined partial discharge sensor 12 and the fault location 13 is determined according to the second time difference, the transmission rate of the electromagnetic wave signal, and the transmission rate of the ultrasonic wave signal.

[0062] Specifically, take the calculation of the first distance between the first acoustic-electric combined partial discharge sensor 11 and the fault location 13 as an example. According to the formula Δt=t2-t1=S1 / v2-S1 / v1, it can be known that: ; The transmission speed of the electromagnetic wave signal v1 can be calculated as the speed of light, and the transmission speed of the ultrasonic signal v2 can be calculated as the speed of sound in air, 340 m / s.

[0063] Since the transmission speed of electromagnetic wave signals is much greater than that of ultrasonic signals, the above formula can be simplified in specific calculations: ; Based on this, the first distance can be determined solely based on the product of the ultrasonic signal's transmission speed and the first time difference; the second distance can be determined based on the product of the ultrasonic signal's transmission speed and the second time difference. In other words, the first time is used as the reference time, and the second time at which the first acoustic-electric combined PD sensor receives the ultrasonic signal is used as the acoustic wave transmission time of the discharge source signal to determine the distance between the fault location 13 and the acoustic-electric combined PD sensor.

[0064] Optionally, the fault location information is determined based on the projection point 14, specifically: Determine the fault location information according to the position of the first acoustic-electric combined partial discharge sensor 11, the position of the projection point 14, and the first distance; Alternatively, the fault location information is determined according to the position of the second acoustic-electric combined partial discharge sensor 12 , the position of the projection point 14 , and the second distance.

[0065] Optionally, the line between the fault location 13 and the projection point 14 is perpendicular to the line between the first acoustic-electric combined partial discharge sensor 11 and the second acoustic-electric combined partial discharge sensor 12 .

[0066] Determining the fault location information according to the position of the first acoustic-electric combined partial discharge sensor 11, the position of the projection point 14, and the first distance specifically includes: Determine a third distance from the first acoustic-electric combined partial discharge sensor 11 to the projection point 14 according to the position of the first acoustic-electric combined partial discharge sensor 11 and the position of the projection point 14; Determine a fourth distance between the fault location 13 and the projection point 14 based on the third distance and the first distance; The fault location 13 is determined based on the projection point 14 and the fourth distance.

[0067] Optionally, the plane coordinate diagram of the switch cabinet stores device layout information of the switch cabinet; after determining the fault location 13 according to the projection point 14, the method further includes: In the plane coordinate diagram of the switch cabinet, the faulty component is determined by combining the component layout information of the switch cabinet and the fault location 13 .

[0068] Specifically, the switchgear component layout information includes the position coordinates of each component in the switchgear, indicating the specific location of each component within the switchgear, including the location information of components such as the current transformer 331, outgoing contact 332, grounding switch 333, and line lightning arrester 334. By comparing the fault location 13 with the locations of the components, one or more components near the fault location 13 are identified as faulty components.

[0069] Optionally, after determining the failed device, the method further includes: Generates corresponding cabinet partial discharge abnormality alarm information based on the determined faulty device.

[0070] Specifically, in order to facilitate users to timely obtain information about faulty components in the switch cabinet and to handle the faulty components, corresponding partial discharge abnormality alarm information is generated in the cabinet according to the faulty components.

[0071] The present invention constructs an algorithm for locating partial discharges inside the cabinet. By monitoring ultrasonic signals and electromagnetic wave signals through an acoustic-electric combined partial discharge sensor, the distance between the fault location and the acoustic-electric combined partial discharge sensor is determined based on the time arrival difference between the ultrasonic and electromagnetic wave signals, thereby locating the partial discharge power source inside the cabinet.

[0072] In an embodiment of the present invention, the parameters of the combined acoustic and electrical partial discharge sensor include: ultrasonic monitoring range 20-60kHz, sensitivity 0dBμV; transient monitoring range 3-100MHz, ultra-high frequency monitoring range 500-1500MHz, sensitivity -60dBm; wireless communication RF transmission power 15-17dBm; receiving sensitivity -109dBm.

[0073] The method for locating partial discharges within a substation switch cabinet of the present invention is applicable to the field of partial discharge monitoring of substation switch cabinets and can be used by operation and maintenance personnel to provide accurate identification of partial discharge anomalies inside and outside the switch cabinet when the switch cabinet has a partial discharge anomaly. When a partial discharge anomaly of the switch cabinet is caused by an internal abnormality of the switch cabinet, an internal partial discharge anomaly alarm is issued, and alarm information of the internal partial discharge anomaly alarm is sent to the distribution network cloud master station so that the partial discharge anomaly within the cabinet can be handled. Corresponding data can also be sent to the distribution network cloud master station so that the specific data source of the abnormality, including partial discharge maps, etc., can be displayed on the distribution network cloud master station to assist operation and maintenance personnel in further analysis.

[0074] The method for locating partial discharge in a substation switch cabinet of the present invention can accurately locate the partial discharge in the switch cabinet based on the combined acoustic and electrical partial discharge sensor when it is determined that the partial discharge abnormality in the switch cabinet is caused by an abnormality inside the switch cabinet. This helps operation and maintenance personnel to quickly and accurately find the fault point, reduce the equipment operation and maintenance workload of grassroots business personnel, improve operation and maintenance efficiency, and ensure the reliability of power supply services.

[0075] The present invention also supports sensor group scheduling when connecting to various sensors, and supports calculation of up to 4 groups with a total of 40 sensors. It can separately schedule the sensors deployed in each switch cabinet and locate the source of local discharge in the cabinet.

[0076] like Figure 3 As shown, in a second aspect, the present invention provides a device for locating partial discharge in a substation switch cabinet, the device comprising a processor, and a first acoustic-electric combined partial discharge sensor and a second acoustic-electric combined partial discharge sensor disposed in each switch cabinet and connected to the processor; the first acoustic-electric combined partial discharge sensor and the second acoustic-electric combined partial discharge sensor are both used to collect electromagnetic wave signals and ultrasonic signals emitted from the fault location; the device is applied to the processor, and the device comprises: The first processing module 201 is used to respectively obtain a first time difference between the electromagnetic wave signal and the ultrasonic signal received by the first acoustic-electric combined partial discharge sensor, and a second time difference between the electromagnetic wave signal and the ultrasonic signal received by the second acoustic-electric combined partial discharge sensor; A second processing module 202 is configured to determine a first distance between the first combined acoustic-electric partial discharge sensor and the fault location, and a second distance between the second combined acoustic-electric partial discharge sensor and the fault location based on the first time difference, the second time difference, the transmission rate of the electromagnetic wave signal, and the transmission rate of the ultrasonic signal; A third processing module 203 is configured to determine, within the plane coordinate diagram of the switchgear, a projection point of the fault location within the switchgear based on the position of the first combined acoustic-electric partial discharge sensor, the position of the second combined acoustic-electric partial discharge sensor, the first distance, and the second distance; the projection point being located on a line connecting the first combined acoustic-electric partial discharge sensor and the second combined acoustic-electric partial discharge sensor; The fourth processing module 204 is configured to determine the fault location according to the projection point.

[0077] Optionally, the third processing module 203 is specifically configured to execute: In the plane coordinate diagram of the switch cabinet, a first position coordinate is determined according to the position of the first acoustic-electric combined partial discharge sensor, and a second position coordinate is determined according to the position of the second acoustic-electric combined partial discharge sensor; Combining the straight line equation with the projection theorem, the projection point of the fault position in the switch cabinet is determined according to the first position coordinate, the second position coordinate, the first distance, and the second distance.

[0078] Optionally, when determining the projection point of the fault location in the switch cabinet according to the first position coordinate, the second position coordinate, the first distance, and the second distance in combination with the straight line equation and the projection theorem, the third processing module 203 is specifically configured to execute: According to the projection theorem, the ratio of the first distance to the second distance is equal to the distance between the first acoustic-electric combined partial discharge sensor and the projection point and the distance between the second acoustic-electric combined partial discharge sensor and the projection point. Combining the first position coordinate and the second position coordinate yields a first equation. The equation of the straight line passing through the first position coordinate and the second position coordinate is used as the second equation; The first and second equations are solved together to obtain the coordinates of the projection point of the fault position in the switch cabinet.

[0079] Optionally, in the third processing module 203, the first position coordinate is represented by (x1, y1), the second position coordinate is represented by (x2, y2), and the coordinate of the projection point is represented by (x, y); the first equation is specifically configured as: ; The second equation is specifically configured as: ; Here, s1 represents the first distance, and s2 represents the second distance.

[0080] Optionally, the second processing module 202 is specifically configured to execute: Determining a first distance between the first acoustic-electric combined partial discharge sensor and the fault location based on the first time difference, the transmission rate of the electromagnetic wave signal, and the transmission rate of the ultrasonic signal; A second distance between the second acoustic-electric combined partial discharge sensor and the fault location is determined according to the second time difference, the transmission rate of the electromagnetic wave signal, and the transmission rate of the ultrasonic wave signal.

[0081] Optionally, the fourth processing module 204 is specifically configured to execute: The fault location information is determined based on the position of the first combined acoustic and electrical partial discharge sensor, the position of the projection point, and the first distance, or the fault location information is determined based on the position of the second combined acoustic and electrical partial discharge sensor, the position of the projection point, and the second distance.

[0082] Optionally, a line between the fault location and the projection point is perpendicular to a line between the first combined acoustic and electrical partial discharge sensor and the second combined acoustic and electrical partial discharge sensor; when determining the fault location information based on the position of the first combined acoustic and electrical partial discharge sensor, the position of the projection point, and the first distance, the fourth processing module 204 is specifically configured to execute: Determining a third distance from the first acoustic-electric combined partial discharge sensor to the projection point based on the position of the first acoustic-electric combined partial discharge sensor and the position of the projection point; determining a fourth distance between the fault location and the projection point based on the third distance and the first distance; The fault location is determined based on the projection point and the fourth distance.

[0083] Optionally, the device further includes a fifth processing module; the plane coordinate diagram of the switch cabinet stores the device layout information of the switch cabinet; after determining the fault location according to the projection point, the fifth processing module is specifically configured to execute: In the plane coordinate diagram of the switch cabinet, the faulty device is determined by combining the device layout information of the switch cabinet and the fault location.

[0084] Optionally, the apparatus further includes a sixth processing module; after determining the failed component, the sixth processing module is specifically configured to execute: Generates corresponding cabinet partial discharge abnormality alarm information based on the determined faulty device.

[0085] Those skilled in the art will clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0086] By deploying the partial discharge locating device in the substation switch cabinet of the present invention in the substation, the position of the partial discharge source in the cabinet can be accurately located using a combined acoustic and electrical fault locating method, thereby helping operation and maintenance personnel to quickly and accurately find the fault point, shorten the troubleshooting time, improve maintenance efficiency, and achieve the purpose of accurately identifying and quickly handling switch cabinet faults.

[0087] In a third aspect, an embodiment of the present invention further provides an electronic device comprising a processor and a memory, wherein the memory stores at least one instruction, at least one program, a code set or an instruction set, and the at least one instruction, at least one program, a code set or an instruction set is loaded and executed by the processor to implement the method for locating partial discharge in a substation switch cabinet in an embodiment of the present invention.

[0088] In a fourth aspect, an embodiment of the present invention further provides a computer-readable storage medium, which stores at least one instruction, at least one program, code set or instruction set, and the at least one instruction, at least one program, code set or instruction set is loaded and executed by a processor to implement the method for locating partial discharge in a substation switch cabinet in an embodiment of the present invention.

[0089] In the above embodiments, all or part of the embodiments can be implemented using software, hardware, firmware, or any combination thereof. When implemented using software, all or part of the embodiments can be implemented in the form of a computer program product. A computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, all or part of the processes or functions according to the embodiments of the present invention are generated. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions can be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another. For example, the computer instructions can be transmitted from one website, computer, server, or data center to another website, computer, server, or data center via wired (e.g., coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) means. The computer-readable storage medium can be any available medium that can be accessed by a computer, or a data storage device such as a server or data center that integrates one or more available media. Available media can include magnetic media (e.g., floppy disks, hard disks, magnetic tapes), optical media (e.g., DVDs), or semiconductor media (e.g., solid-state drives (SSDs)).

[0090] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions within the technical scope disclosed by the present invention shall be covered by the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be subject to the scope of protection of the claims.

Claims

1. A method for locating partial discharge in a substation switch cabinet, characterized in that: The invention comprises a processor, and a first acoustic-electric combined partial discharge sensor and a second acoustic-electric combined partial discharge sensor disposed in each switch cabinet and connected to the processor; the first acoustic-electric combined partial discharge sensor and the second acoustic-electric combined partial discharge sensor are both used to collect electromagnetic wave signals and ultrasonic signals emitted from the fault location; the method is applied to the processor, and the method comprises: Respectively obtaining a first time difference between when the first acoustic-electric combined partial discharge sensor receives the electromagnetic wave signal and the ultrasonic signal, and a second time difference between when the second acoustic-electric combined partial discharge sensor receives the electromagnetic wave signal and the ultrasonic signal; Determining a first distance between the first acoustic-electric combined partial discharge sensor and the fault location, and a second distance between the second acoustic-electric combined partial discharge sensor and the fault location, based on the first time difference, the second time difference, the transmission rate of the electromagnetic wave signal, and the transmission rate of the ultrasonic signal; In the plane coordinate diagram of the switch cabinet, a projection point of the fault position in the switch cabinet is determined based on the position of the first combined acoustic-electric partial discharge sensor, the position of the second combined acoustic-electric partial discharge sensor, the first distance, and the second distance; the projection point is located on a line connecting the first combined acoustic-electric partial discharge sensor and the second combined acoustic-electric partial discharge sensor; The fault location is determined according to the projection point.

2. The method for locating partial discharge in a substation switch cabinet according to claim 1, characterized in that: Determining, in the plane coordinate diagram of the switch cabinet, a projection point of the fault location within the switch cabinet based on the position of the first combined acoustic-electric partial discharge sensor, the position of the second combined acoustic-electric partial discharge sensor, the first distance, and the second distance, specifically includes: In the plane coordinate diagram of the switch cabinet, a first position coordinate is determined according to the position of the first acoustic-electric combined partial discharge sensor, and a second position coordinate is determined according to the position of the second acoustic-electric combined partial discharge sensor; In combination with the straight line equation and the projection theorem, the projection point of the fault position in the switch cabinet is determined according to the first position coordinate, the second position coordinate, the first distance, and the second distance.

3. The method for locating partial discharge in a substation switch cabinet according to claim 2, characterized in that: Combining the straight line equation and the projection theorem to determine the projection point of the fault position in the switch cabinet according to the first position coordinate, the second position coordinate, the first distance, and the second distance specifically includes: According to the projection theorem, the ratio of the first distance to the second distance is equal to the distance between the first acoustic-electric combined partial discharge sensor and the projection point and the distance between the second acoustic-electric combined partial discharge sensor and the projection point. The first position coordinate and the second position coordinate are combined to obtain a first equation. The equation of the straight line passing through the first position coordinate and the second position coordinate is used as the second equation; The first equation and the second equation are solved together to obtain the coordinates of the projection point of the fault position in the switch cabinet.

4. The method for locating partial discharge in a substation switch cabinet according to claim 3, characterized in that: The first position coordinates are represented by (x1, y1), the second position coordinates are represented by (x2, y2), and the coordinates of the projection point are represented by (x, y); the first equation is specifically: ； The second equation is specifically: ； Here, s1 represents the first distance, and s2 represents the second distance.

5. The method for locating partial discharge in a substation switch cabinet according to claim 1, characterized in that: Determining a first distance between the first acoustic-electric combined partial discharge sensor and the fault location, and a second distance between the second acoustic-electric combined partial discharge sensor and the fault location, based on the first time difference, the second time difference, the transmission rate of the electromagnetic wave signal, and the transmission rate of the ultrasonic signal, specifically includes: Determining a first distance between the first acoustic-electric combined partial discharge sensor and the fault location based on the first time difference, the transmission rate of the electromagnetic wave signal, and the transmission rate of the ultrasonic signal; A second distance between the second acoustic-electric combined partial discharge sensor and the fault location is determined according to the second time difference, the transmission rate of the electromagnetic wave signal, and the transmission rate of the ultrasonic signal.

6. The method for locating partial discharge in a substation switch cabinet according to claim 1, characterized in that: Determine the fault location information according to the projection point, specifically: The fault location information is determined based on the position of the first combined acoustic and electrical partial discharge sensor, the position of the projection point, and the first distance, or the fault location information is determined based on the position of the second combined acoustic and electrical partial discharge sensor, the position of the projection point, and the second distance.

7. The method for locating partial discharge in a substation switch cabinet according to claim 6, characterized in that: The line between the fault position and the projection point is perpendicular to the line between the first acoustic-electric combined partial discharge sensor and the second acoustic-electric combined partial discharge sensor; and determining the fault position information according to the position of the first acoustic-electric combined partial discharge sensor, the position of the projection point, and the first distance specifically includes: determining a third distance from the first acoustic-electric combined partial discharge sensor to the projection point based on the position of the first acoustic-electric combined partial discharge sensor and the position of the projection point; determining a fourth distance between the fault location and the projection point based on the third distance and the first distance; The fault location is determined according to the projection point and the fourth distance.

8. The method for locating partial discharge in a substation switch cabinet according to claim 1, characterized in that: The plane coordinate diagram of the switch cabinet stores the device layout information of the switch cabinet; after determining the fault location according to the projection point, the method further includes: In the plane coordinate diagram of the switch cabinet, the faulty component is determined by combining the component layout information of the switch cabinet and the fault location.

9. The method for locating partial discharge in a substation switch cabinet according to claim 8, characterized in that: After determining the failed component, the method further includes: Generates corresponding cabinet partial discharge abnormality alarm information based on the determined faulty device.

10. A partial discharge positioning device in a substation switch cabinet, characterized in that: The device comprises a processor, and a first acoustic-electric combined partial discharge sensor and a second acoustic-electric combined partial discharge sensor disposed in each switch cabinet and connected to the processor; the first acoustic-electric combined partial discharge sensor and the second acoustic-electric combined partial discharge sensor are both used to collect electromagnetic wave signals and ultrasonic signals emitted from the fault location; the device is applied to the processor, and the device comprises: a first processing module, configured to respectively obtain a first time difference between when the first acoustic-electric combined partial discharge sensor receives the electromagnetic wave signal and the ultrasonic signal, and a second time difference between when the second acoustic-electric combined partial discharge sensor receives the electromagnetic wave signal and the ultrasonic signal; a second processing module, configured to determine a first distance between the first acoustic-electric combined partial discharge sensor and the fault location, and a second distance between the second acoustic-electric combined partial discharge sensor and the fault location based on the first time difference, the second time difference, the transmission rate of the electromagnetic wave signal, and the transmission rate of the ultrasonic signal; a third processing module, configured to determine, in the plane coordinate diagram of the switch cabinet, a projection point of the fault location within the switch cabinet based on the position of the first combined acoustic-electric partial discharge sensor, the position of the second combined acoustic-electric partial discharge sensor, the first distance, and the second distance; the projection point being located on a line connecting the first combined acoustic-electric partial discharge sensor and the second combined acoustic-electric partial discharge sensor; The fourth processing module is used to determine the fault location according to the projection point.

11. The partial discharge locating device in a substation switch cabinet according to claim 10, characterized in that: The third processing module is specifically configured to execute: In the plane coordinate diagram of the switch cabinet, a first position coordinate is determined according to the position of the first acoustic-electric combined partial discharge sensor, and a second position coordinate is determined according to the position of the second acoustic-electric combined partial discharge sensor; In combination with the straight line equation and the projection theorem, the projection point of the fault position in the switch cabinet is determined according to the first position coordinate, the second position coordinate, the first distance, and the second distance.

12. The partial discharge locating device in a substation switch cabinet according to claim 11, characterized in that: When determining the projection point of the fault location within the switch cabinet according to the first position coordinate, the second position coordinate, the first distance, and the second distance in combination with a straight line equation and a projection theorem, the third processing module is specifically configured to execute: According to the projection theorem, the ratio of the first distance to the second distance is equal to the distance between the first acoustic-electric combined partial discharge sensor and the projection point and the distance between the second acoustic-electric combined partial discharge sensor and the projection point. The first position coordinate and the second position coordinate are combined to obtain a first equation. The equation of the straight line passing through the first position coordinate and the second position coordinate is used as the second equation; The first equation and the second equation are solved together to obtain the coordinates of the projection point of the fault position in the switch cabinet.

13. The partial discharge locating device in a substation switch cabinet according to claim 12, characterized in that: In the third processing module, the first position coordinates are represented by (x1, y1), the second position coordinates are represented by (x2, y2), and the coordinates of the projection point are represented by (x, y); the first equation is specifically configured as: ； The second equation is specifically configured as: ； Here, s1 represents the first distance, and s2 represents the second distance.

14. The partial discharge locating device in a substation switch cabinet according to claim 10, characterized in that: The second processing module is specifically configured to execute: Determining a first distance between the first acoustic-electric combined partial discharge sensor and the fault location based on the first time difference, the transmission rate of the electromagnetic wave signal, and the transmission rate of the ultrasonic signal; A second distance between the second acoustic-electric combined partial discharge sensor and the fault location is determined according to the second time difference, the transmission rate of the electromagnetic wave signal, and the transmission rate of the ultrasonic signal.

15. The partial discharge locating device in a substation switch cabinet according to claim 10, characterized in that: The fourth processing module is specifically configured to execute: The fault location information is determined based on the position of the first combined acoustic and electrical partial discharge sensor, the position of the projection point, and the first distance, or the fault location information is determined based on the position of the second combined acoustic and electrical partial discharge sensor, the position of the projection point, and the second distance.

16. The partial discharge locating device in a substation switch cabinet according to claim 15, characterized in that: The line between the fault location and the projection point is perpendicular to the line between the first acoustic-electric combined partial discharge sensor and the second acoustic-electric combined partial discharge sensor; when determining the fault location information based on the position of the first acoustic-electric combined partial discharge sensor, the position of the projection point, and the first distance, the fourth processing module is specifically configured to execute: determining a third distance from the first acoustic-electric combined partial discharge sensor to the projection point based on the position of the first acoustic-electric combined partial discharge sensor and the position of the projection point; determining a fourth distance between the fault location and the projection point based on the third distance and the first distance; The fault location is determined according to the projection point and the fourth distance.

17. The partial discharge locating device in a substation switch cabinet according to claim 10, characterized in that: The device further includes a fifth processing module; the plane coordinate diagram of the switch cabinet stores the device layout information of the switch cabinet; after determining the fault location according to the projection point, the fifth processing module is specifically configured to execute: In the plane coordinate diagram of the switch cabinet, the faulty component is determined by combining the component layout information of the switch cabinet and the fault location.

18. The partial discharge locating device in a substation switch cabinet according to claim 17, characterized in that: The apparatus further includes a sixth processing module; after determining the failed component, the sixth processing module is specifically configured to execute: Generates corresponding cabinet partial discharge abnormality alarm information based on the determined faulty device.

19. An electronic device, characterized in that: The electronic device includes a processor and a memory, wherein the memory stores at least one instruction, at least one program, a code set, or an instruction set, and the at least one instruction, the at least one program, the code set, or the instruction set is loaded and executed by the processor to implement the method for locating partial discharge in a substation switch cabinet according to any one of claims 1 to 9.

20. A computer-readable storage medium, characterized in that The storage medium stores at least one instruction, at least one program, a code set, or an instruction set, and the at least one instruction, the at least one program, the code set, or the instruction set is loaded and executed by the processor to implement the method for locating partial discharge in a substation switch cabinet according to any one of claims 1 to 9.

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