Superposition detection method for surface corona discharge of high-voltage electrical equipment and electronic equipment

Abstract

The invention relates to a superposition detection method and electronic equipment for surface corona discharge of high-voltage electrical equipment, a superposition sounder device is arranged on each of three lateral surfaces of the high-voltage electrical equipment, a partial discharge detector is used for receiving superposition audio signal data on the fourth lateral surface, and the method comprises the following steps: measuring a surface corona discharge signal Max n1 of the high-voltage electrical equipment; the method comprises the following steps: sequentially turning on each superposition sounder device, emitting sound waves of 1K-20KHz, and measuring three-side full-frequency superposition audio signals of a corresponding A phase, namely sigma n, 1, sigma n, 2 and sigma n, 3; judging whether the full-frequency superposition audio signal is larger than Max n1 or not, if yes, determining that surface corona discharge occurs, and positioning a surface corona discharge part, and if not, determining that surface corona discharge does not occur; and repeating the steps, and detecting and positioning the B phase and the C phase. Compared with the prior art, the method has the advantages that the surface corona discharge can be timely and sensitively detected, the surface corona discharge part can be positioned, and the insulation deterioration degree can be pre-judged.

Description

Technical Field

[0001] The invention relates to the technical field of corona discharge detection along the surface of high-voltage electrical equipment, and in particular to a superposition detection method for corona discharge along the surface of high-voltage electrical equipment. Background Art

[0002] In the power system, high-voltage electrical appliances (such as high-voltage switchgear, all-metal busbar boxes, and bushings) will experience partial discharge. The partial discharge phenomenon is the phenomenon of arc discharge or corona discharge in local areas of electrical equipment. When partial discharge occurs, it is mainly accompanied by high-frequency electromagnetic waves, ultra-high frequency electromagnetic waves, and ultrasonic waves, while emitting infrared light, ultraviolet light, and producing gases such as ozone. At present, the commonly used partial discharge live detection technologies include ultrasonic method (AE), transient earth voltage method (TEV) and ultra-high frequency method (UHF). In recent years, live detection technology based on partial discharge detection has been increasingly widely used.

[0003] However, the following deficiencies were found during the on-site partial discharge detection process:

[0004] a) External interference and weak signal: The main reason for the unsatisfactory on-site detection effect is that there are many strong electromagnetic interference sources from the outside world. It is very difficult to eliminate and prevent external electromagnetic interference by relying solely on hardware technology. At the same time, the collected signal is weak and the amplitude is very small, which is easily submerged by background noise.

[0005] b) Fully enclosed metal shielding effect: When weak local discharge occurs in switch cabinets, all-metal bus boxes and all-metal combination electrical appliances, the weak local discharge cannot be discovered and detected in time because the fully enclosed metal container has a shielding effect on electromagnetic waves.

[0006] According to IEEE standards, the frequency range of partial discharge is usually between several thousand hertz and several hundred megahertz. In electrical equipment, partial discharge will generate weak pulse currents. The frequency range of these pulse currents is wide, but mainly concentrated in the frequency band of 30kHz to 500kHz. The frequency range of high-frequency partial discharge (HFPD) is 0.2 to 2GHz, the frequency range of ultra-high frequency partial discharge (UHF PD) is 300MHz to 3GHz, and the frequency range of ultra-high frequency partial discharge (TEV PD) is 20kHz to 500MHz.

[0007] The busbar refers to the connection of various voltage distribution devices in the substation, as well as the connection between electrical equipment such as transformers and corresponding distribution devices. Its function is to connect the various current-carrying branch circuits in the substation and distribution device together, and it plays the role of collecting, distributing and transmitting electric energy. It is an important equipment in the substation.

[0008] At present, the closed busbars used in substations generally have only ordinary sealing functions, which can prevent large foreign objects from entering, but cannot effectively separate sand and dust, moisture in the outside air, and the temperature display inside the busbar box. After running for a period of time, the following faults may occur:

[0009] 1) The surface of the operating support insulator will be degraded due to the accumulation of sand and dust. Under humid or other abnormal weather conditions, external humid air will enter the box. When the bus stops running or the support insulator is cooled by radiation at night and its temperature is lower than the ambient air temperature, the surface of the support insulator will absorb moisture or condense. Condensation can easily form a fully humidified state in all parts of the support insulator. In a humid environment, the ionizable substances in the dirty layer of the dirty insulator will gradually dissolve in water. A layer of conductive water film forms on the surface of the insulator. The ionizable substances in the dirt determine the conductivity of the water film, and the insoluble substances in the dirt can play a role in absorbing moisture. This water film forms a conductive path along the surface of the insulator, allowing the leakage current to pass through the surface of the insulator, resulting in a significant reduction in the insulation performance of the busbar, and then causing partial discharge.

[0010] 2) Condensation on the partitions on the inner column wall of the common box enclosed busbar. This is because the partition is an epoxy resin board, which is mainly composed of epoxy glass fiber, and has the characteristics of non-flame retardant, hard material, and easy to absorb moisture. Especially for the partitions installed on the common wall busbar, due to the pure indoor and outdoor temperature difference, when the busbar operating conditions change, the unit is shut down or the weather changes abnormally, a large amount of condensation water will appear on the surface of the partition. Dew. This condensation seriously affects the operation of the bus. For example, in the cold winter, when the outdoor temperature is -15℃, the saturated water vapor density per cubic meter in the air is 1.73g / M3, and the temperature of the indoor switch room is usually around 20℃. The saturated water vapor density per cubic meter of indoor air is 17.28g / M3. That is to say, when the indoor and outdoor temperature difference is 35℃, 15.55 grams of water will condense per cubic meter of air on the partition surface of the A column wall in the enclosed busbar and become dew adsorbed on it. On the surface of the partition, due to the concentration of condensation water, the partition becomes the weakest point of the insulation of the entire shared box enclosed busbar. This water will seriously affect the insulation of the busbar. (The above data is from the saturated humid air table).

[0011] 3) Each phase conductor of the common box busbar has a layer of insulating paint on it, the purpose is to improve the insulation level between the conductor and the supporting insulator. However, as the service life increases, the insulating layer will gradually age or oxidize, peel off from the conductor, and cause the conductor to leak. When encountering special and special climate and environmental changes, it is easy to cause discharge short circuit accidents.

[0012] Due to dust or dirt on the surface of the supporting insulator in the box busbar, the field strength increases. When the field strength reaches the gas breakdown strength, local discharge will occur in the equipment inside the box. Among them are: Surface discharge: The solid medium used to fix and support the live parts of electrical equipment is mostly in the air. When the voltage exceeds a certain limit, discharge along the surface of the solid medium often occurs at the interface between the solid medium and the air, which is called surface discharge. Air gap discharge: During the processing of the insulating medium, due to defects in the process and materials, impurities or air gaps will exist in the insulator, forming defects in the insulating medium. Generally, the air gap is filled with air or hydrocarbon gas, and the pressure is close to atmospheric pressure. When alternating high voltage is applied externally, local and repeated breakdown will occur at the insulation defect. Corona discharge: Corona discharge often occurs in areas with high electric field strength in non-uniform electric fields. Corona discharge occurs in places where the radius of curvature of the conductor shell is small, especially at the tip, where the charge density is very large. The electric field is proportional to the charge density close to the surface of the charged body, so the field strength is very strong at the tip of the conductor. Therefore, when the potential of the conductor around the air increases, corona discharge may occur at these tips.

[0013] The signals of surface discharge and corona discharge in these partial discharges are very weak and cannot be detected sensitively by existing partial discharge detectors and other equipment.

[0014] How to achieve sensitive detection of surface corona discharge in high-voltage electrical equipment has become a technical problem that needs to be solved. Summary of the invention

[0015] The purpose of the present invention is to overcome the defects of the above-mentioned prior art and provide a superposition detection method and electronic equipment for surface corona discharge of high-voltage electrical equipment.

[0016] The purpose of the present invention can be achieved by the following technical solutions:

[0017] According to one aspect of the present invention, a superposition detection method for surface corona discharge of high-voltage electrical equipment is provided, wherein a superposition sounder device is placed on each of the three lateral sides of the high-voltage electrical equipment, and a partial discharge detector is used on the fourth lateral side to receive superposition audio signal data, the method comprising:

[0018] Step S1, measuring the surface corona discharge signal Max n1 of the high-voltage electrical equipment;

[0019] Step S2, turn on each superposition sound generator device in turn, emit sound waves of 1K to 20KHz, and measure the lateral three-sided full-frequency superposition audio signals corresponding to phase A, which are: ∑n,1, ∑n,2 and ∑n,3 respectively;

[0020] Step S3, determining whether the full-frequency superimposed audio signal is greater than Max n1, if yes, surface corona discharge occurs, and the location of surface corona discharge is located, otherwise, surface corona discharge does not occur;

[0021] Repeat steps S2 to S3 to detect and locate phase B and phase C.

[0022] Preferably, the vertical distance between the sound-generating end of the superimposed sounder device and the center line of the opposite side of the high-voltage electrical equipment under test is greater than a set distance.

[0023] Preferably, the sound-emitting end of the superimposed sound generator device faces the end face of the high-voltage electrical equipment.

[0024] Preferably, if it is determined in step S3 that surface corona discharge occurs, the method further comprises emitting multi-band sound waves within 1K to 20KHz for detection to analyze the degree of insulation degradation of the discharge.

[0025] More preferably, the multiple frequency bands include 1K-6KHz, 5K-11KHz, 10K-16KHz and 15K-20KHz.

[0026] Preferably, the location of the surface corona discharge is located according to the frequency and amplitude of the waveform superimposed signal corresponding to each superimposed sound generator device.

[0027] More preferably, the waveform superposition effect occurs in the same frequency band as the surface corona discharge, and the amplitude after superposition increases, changing the original fluctuating waveform into a nearly horizontal line.

[0028] More preferably, after the superimposed sound generator device finishes playing the audio in the frequency band where the partial discharge is located, it returns to a fluctuating waveform.

[0029] According to another aspect of the present invention, an electronic device is provided, including a memory and a processor, wherein a computer program is stored in the memory, and the method described above is implemented when the processor executes the program.

[0030] According to a third aspect of the present invention, there is provided a computer-readable storage medium having a computer program stored thereon, wherein the program implements the method described above when executed by a processor.

[0031] Compared with the prior art, the present invention has the following beneficial effects:

[0032] 1) The present invention deploys superposition generator devices on three sides of high-voltage equipment suspected of local surface corona discharge, uses a partial discharge detector to receive superposition audio signal data on the fourth side, uses the superposition generator device to transmit audio signals, and produces a frequency superposition effect at the discharge frequency point. After superimposing the originally weak local discharge, an obvious frequency superposition effect is generated, which can promptly and sensitively detect the surface corona discharge and locate the location of the surface corona discharge.

[0033] 2) The present invention uses multi-band sound waves to perform detection respectively to predict the degree of insulation degradation of local corona discharge. The lower the discharge frequency, the more severe the insulation degradation.

[0034] 3) The tweeter mouth of the superimposed sounder device faces the high-voltage electrical equipment under test, but is not directly opposite the high-voltage electrical equipment under test, that is, it is deviated from the high-voltage electrical equipment by a certain distance to avoid interference with the measurement. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a schematic diagram of the superposition of the surface corona discharge frequency sound wave and the 1K~20KHz sound wave;

[0036] Figure 2 It is a schematic diagram of the frequency acoustic wave characteristics of surface corona discharge in the present invention;

[0037] Figure 3 It is a schematic diagram of the frequency characteristics after the surface corona discharge frequency sound wave and the actively emitted 50db sound wave are superimposed;

[0038] Figure 4 It is a schematic diagram of the frequency characteristics after the surface corona discharge frequency sound wave and the actively emitted 75db sound wave are superimposed;

[0039] Figure 5 This is a schematic diagram of the placement of various devices during the surface corona discharge test in the present invention;

[0040] Figure 5 (a) is another schematic diagram of the placement of each device during the surface corona discharge test in the present invention;

[0041] Figure 6 It is a schematic diagram of the frequency acoustic wave characteristics of the surface corona discharge at the Δn4 position during full wave scanning in the present invention;

[0042] Figure 7 It is a schematic diagram of full-wave scanning frequency acoustic wave characteristics after superimposing the actively emitted acoustic wave at the Δn4 position in the present invention;

[0043] Figure 8 It is a schematic diagram of the process of surface corona discharge detection in the present invention. DETAILED DESCRIPTION

[0044] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0045] Example 1

[0046] In response to the above problems, the present invention combines the "superposition principle" with partial discharge detection to indirectly measure the weak discharge in the bus box, while ensuring that the monitoring device will not affect the safe operation of the circuit breaker and the power grid. The research results have a relatively good implementation conclusion in the fully enclosed bus box, which is a new detection method.

[0047] The principle of wave superposition means that when several waves propagate in the same medium, if they meet somewhere in space, the vibration of the particle at the meeting point is the synthesis of the vibrations caused by each wave, and the displacement of the particle at any time is the vector sum of the displacements caused by each wave. After the waves meet, they still maintain their original frequency, wavelength, vibration direction and other characteristics and continue to move forward in the original propagation direction, as if they did not encounter other waves on their way. This is also called the principle of wave independence. Specifically, the waveform superposition principle shows that if there are two waveforms y1(t) and y2(t), their superposition is y(t) = y1(t) + y2(t), where y(t) is the waveform after superposition. This principle can be extended to any number of waveforms. For example, the waveform of the superposition of three waves y1(t), y2(t) and y3(t) is: y(t) = y1(t) + y2(t) + y3(t). The effect of superposition may be enhancement or cancellation, depending on the phase relationship of the waveforms.

[0048] The superposition principle of waves is an important physical principle that describes the way multiple waveforms interact with each other [3]. It has applications in many fields, such as electromagnetic wave communications, acoustics, and optics. In acoustics, the superposition principle of sound waves is used to describe the effect of multiple sound sources on the sound heard by the listener. This principle can also be applied to various types of waveforms, such as electromagnetic waves, sound waves, etc.

[0049] According to the superposition principle of sound waves, when there are two or more sound sources in space, the propagation law of the sound waves emitted by each sound source will not be changed by the existence of other sound waves. However, the fluctuation at a certain position in space is the superposition of the vibrations excited by each sound wave at that point.

[0050] This embodiment relates to a superposition detection method for surface corona discharge of high-voltage electrical equipment. It is suitable for detection in a 110 kV busbar box or an operating equipment environment. In order to ensure the safety of the detection personnel and prevent static electricity transmission in the operating equipment environment, the housing of the superposition generator device used for detection must be made of insulating material.

[0051] The superposition generator device actively emits a sound wave frequency, which has a superimposed effect with the frequency of local corona discharge. Since the surface corona discharge frequency is mostly concentrated between 6K and 15kHz, a superposition sound generator device is used to actively emit a sound wave frequency of 1K to 20KHz to ensure the accuracy of the emitted treble frequency. Figure 1 The middle green color is the frequency characteristic of the sound wave along the surface corona discharge, and the red color is the frequency characteristic of the sound wave superimposed after the actively emitted 1K~20kH sound wave.

[0052] In the process of superposition effect of an actively emitted sound wave frequency and the sound wave frequency generated by local surface corona discharge, the decibel size of the actively emitted superimposed sound wave frequency has a significant impact on the amplitude effect of the superimposed frequency band. The higher the decibel, the more obvious the amplitude change of the superimposed band.

[0053] Figure 2 is the frequency acoustic wave characteristic of surface corona discharge, Figure 3 The 50db superimposed frequency characteristics of the emission, Figure 4 The 75db superimposed frequency characteristic of the emission is calculated as follows:

[0054] Lg(n1+Δn)>Lgn1

[0055] Where n1 is the amplitude of the surface corona discharge sound wave, in decibels, and Δn is the amplitude of the external superimposed sound, in decibels.

[0056] An acoustic wave signal is actively emitted at the three locations Δn1, Δn2, and Δn3 on site, which is superimposed on the acoustic wave signal generated by the local surface corona discharge. The superposition results of the acoustic waves actively emitted at the three locations are similar.

[0057] Lg(n1+Δn1)>Lgn1~Lg(n1+Δn2)>Lgn1~Lg(n1+Δn3)>Lgn1

[0058] Among them, n1 is the amplitude of the surface corona discharge signal, Δni (i=1,2,3) is the amplitude of the external superimposed sound wave at each position, and ~ indicates similarity.

[0059] like Figure 5, place a superimposed sounder device on each of the three lateral sides of the high-voltage electrical equipment, with its horn facing the high-voltage electrical equipment, such as the positions of Δn1, Δn2 and Δn3, and use a partial discharge detector to receive the superimposed audio signal data in the fourth direction. Open the superimposed sounder devices on the three sides in turn for detection. The generating end (tweeter horn) of the superimposed sounder device faces the high-voltage electrical equipment under test, but avoid facing the high-voltage electrical equipment under test. The vertical distance between the tweeter horn and the center line of the opposite side of the high-voltage electrical equipment under test must at least meet the set distance. If the superimposed sounder device faces the high-voltage electrical equipment, it will interfere with the measurement.

[0060] like Figure 5 (a) Actively transmit the sound wave frequency at the Δn4 position next to the test position. After superposition, the waveform has no obvious change, so there is no need to actively transmit the sound wave signal at the Δn4 position. The Δn4 position will seriously interfere with the partial discharge detector. The actively transmitted sound wave will not be superimposed with the corona discharge sound wave inside the high-voltage electrical equipment. On the contrary, it will shield the corona discharge sound wave inside the high-voltage electrical equipment. Figure 6 It is the full-wave scanning frequency acoustic wave characteristics of surface corona discharge. Figure 7 The full-wave frequency scanning acoustic wave characteristics after superimposing the actively emitted acoustic wave at the Δn4 position.

[0061] The method for detecting surface corona discharge by each superimposed sounder device is as follows Figure 8 , including the following steps:

[0062] Step S1, measuring the surface corona discharge signal Max n1 of the high-voltage electrical equipment;

[0063] Step S2, turn on the superposition sound generator device, emit 1K~20KHz sound waves, and measure the full-frequency superposition audio signal of phase A corresponding to 1K~20KHz, that is, ∑n,1

[0064] Step S3, determining whether the full-frequency superimposed audio signal ∑n,1 is greater than Max n1;

[0065] Step S4: if yes, then the surface corona discharge occurs; otherwise, the surface corona discharge does not occur.

[0066] Repeat steps S2 to S3 to detect phase B and phase C.

[0067] Similarly, sound waves in the frequency bands of 1K~6KHz, 5K~11KHz, 10K~16KHz, and 15K~20KHz are emitted in sequence to obtain the corresponding full-frequency superimposed audio signals of phase A, phase B, and phase C. The test results are analyzed to output the frequency and amplitude corresponding to the discharge.

[0068] Using multi-frequency sound waves for testing, if multiple local discharges occur in high-voltage electrical appliances, such as dirty surface corona discharges in 35KV high-voltage bushings, and corona discharges occur on multiple skirts, if traditional local discharge instruments are used, only the discharge index or waveform can be measured, and the number of discharges cannot be displayed. In contrast, this device uses multi-frequency segmented superposition testing, and it is very convenient to determine the total number of discharges based on the number of superpositions. Using multiple superposition frequencies to output separately, the degree of insulation degradation of local corona discharge can be predicted. Generally speaking, the lower the discharge frequency, the more severe the insulation degradation.

[0069] Example 2

[0070] This embodiment also involves the application of a superimposed sounder device for detecting surface corona discharge of high-voltage electrical appliances. The project team conducted local surface corona discharge superimposed detection work at a 35 kV station.

[0071] On-site inspection found that the 35 kV B-phase bushing supporting the lower part of the porcelain bottle in the lead-in warehouse of the station had a slight partial discharge and surface corona discharge. The on-site detection results of the partial discharge detector showed that the B-phase bushing had obvious partial discharge waveforms. The following figure shows the detection results of the three phases A, B, and C from left to right.

[0072] The project team places the superimposed sound generator device of the present invention in front of the lead wire bin, with the speaker opening of the superimposed sound generator device facing the inside of the lead wire bin.

[0073] First, the superimposed sounder device emits a frequency of 1K to 20K. The waveform of phase B on the partial discharge detector fluctuates significantly and becomes a horizontal line. At the same time, the amplitude increases, which is significantly greater than the amplitude of the unsuperimposed detection frequency. After the audio in the frequency band of the partial discharge is played, the waveform recovers. However, the detection frequency waveform of the normal A and C phases without corona discharge does not change. At the same time, using a high-sensitivity full-frequency detection instrument, it is found that starting from the superimposed starting frequency, the frequency spectrum will gradually rise and fall, and near a certain frequency point, all frequency spectrum segments will rise and fall in sections, which is consistent with the detection results of the partial discharge detector.

[0074] Next, the superposition sounder device was divided into four frequency ranges of 1K~6K, 5K~11K, 10K~16K, and 15~20K for superposition sound detection. It was found that the surface corona discharge frequency of the B phase bushing through the building had a superposition effect in the range of 6K~8K.

[0075] Through on-site superposition detection, it was found that in a fully enclosed metal space (busbar box), when local corona discharge occurs, the sound of the same frequency band is used to produce a superposition effect, generating a superimposed audio frequency with an amplitude greater than the discharge frequency, which can be easily detected by a local discharge meter or a global audio detection instrument.

[0076] Example 3

[0077] This embodiment also relates to a method for positioning and detecting the surface corona discharge part of high-voltage electrical equipment.

[0078] When corona discharge occurs in high-voltage electrical equipment, the location of the corona discharge cannot be accurately located. For example, taking the bushing through a building at a certain station as an example, the partial discharge detector roughly detects that the discharge waveforms of the A and C phase bushings are normal, while the discharge waveform of the B phase bushing is abnormal outside the lead compartment (live equipment compartment). It can detect that corona discharge occurs in the B phase bushing, but cannot accurately locate the discharge location.

[0079] Use multiple partial discharge detectors placed in the top, middle and bottom (three are selected here) and record the time of waveform superposition. The first location where the waveform superposition changes is the discharge location to be located. Corona discharge occurs in the middle of the B-phase bushing on site. This method can solve the problem of locating the corona discharge location along the surface of partial discharge detection.

[0080] like Figure 5 , emit full-band audio signals on the three lateral sides of the high-voltage electrical equipment (three sides such as the left side, right side, and back), use a partial discharge detector to detect and record the time of waveform superposition in the direction of the fourth lateral side, and derive the location of the bushing discharge based on the time and intensity of the waveform superposition effect. Note: The tweeter mouth of the superimposed sounder device faces the high-voltage electrical equipment under test, but avoid facing the high-voltage electrical equipment under test. If the superimposed sounder device faces the high-voltage electrical equipment, it will interfere with the measurement. According to the attenuation of sound waves in the air, the experimental conclusion is that if the vertical distance away from the center line of the high-voltage electrical equipment under test is greater than 0.5 meters, the sound waves of the generator will not directly interfere with the test.

[0081] The location of the surface corona discharge is located according to the frequency and amplitude of the waveform superimposed signal corresponding to each superimposed sounder device. Specifically, for the same frequency band, if the amplitude of the superimposed signal at position Δn1 > the amplitude of the superimposed signal at position Δn3 > the amplitude of the superimposed signal at position Δn2, then the local discharge location is close to position Δn1 and away from position Δn2.

[0082] Example 4

[0083] The electronic device of the present invention includes a central processing unit (CPU), which can perform various appropriate actions and processes according to computer program instructions stored in a read-only memory (ROM) or loaded from a storage unit into a random access memory (RAM). In the RAM, various programs and data required for device operation can also be stored. The CPU, ROM and RAM are connected to each other via a bus. An input / output (I / O) interface is also connected to the bus.

[0084] Multiple components in the device are connected to the I / O interface, including: input units, such as keyboards, mice, etc.; output units, such as various types of displays, speakers, etc.; storage units, such as disks, optical disks, etc.; and communication units, such as network cards, modems, wireless communication transceivers, etc. The communication unit allows the device to exchange information / data with other devices through computer networks such as the Internet and / or various telecommunication networks.

[0085] The processing unit performs the various methods and processes described above, such as methods S1 to S4. For example, in some embodiments, methods S1 to S4 may be implemented as a computer software program, which is tangibly contained in a machine-readable medium, such as a storage unit. In some embodiments, part or all of the computer program may be loaded and / or installed on the device via a ROM and / or a communication unit. When the computer program is loaded into the RAM and executed by the CPU, one or more steps of methods S1 to S4 described above may be performed. Alternatively, in other embodiments, the CPU may be configured to execute methods S1 to S4 in any other appropriate manner (e.g., by means of firmware).

[0086] The functions described above herein may be performed at least in part by one or more hardware logic components. For example, without limitation, exemplary types of hardware logic components that may be used include: field programmable gate arrays (FPGAs), application specific integrated circuits (ASICs), application specific standard products (ASSPs), systems on chips (SOCs), complex programmable logic devices (CPLDs), and the like.

[0087] The program code for implementing the method of the present invention can be written in any combination of one or more programming languages. These program codes can be provided to a processor or controller of a general-purpose computer, a special-purpose computer or other programmable data processing device, so that the program code, when executed by the processor or controller, enables the functions / operations specified in the flow chart and / or block diagram to be implemented. The program code can be executed entirely on the machine, partially on the machine, partially on the machine as a stand-alone software package and partially on a remote machine, or entirely on a remote machine or server.

[0088] In the context of the present invention, a machine-readable medium may be a tangible medium that may contain or store a program for use by or in conjunction with an instruction execution system, device, or equipment. A machine-readable medium may be a machine-readable signal medium or a machine-readable storage medium. A machine-readable medium may include, but is not limited to, electronic, magnetic, optical, electromagnetic, infrared, or semiconductor systems, devices, or equipment, or any suitable combination of the foregoing. A more specific example of a machine-readable storage medium may include an electrical connection based on one or more lines, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.

[0089] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed by the present invention, and these modifications or replacements should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. A superposition detection method for surface corona discharge of high-voltage electrical equipment, characterized in that: A superimposed sound generator device is placed on each of the three lateral sides of the high-voltage electrical equipment, and a partial discharge detector is used on the fourth lateral side to receive superimposed audio signal data. The method comprises: Step S1, measuring the surface corona discharge signal Max n1 of the high-voltage electrical equipment; Step S2, turn on each superposition sound generator device in turn, emit sound waves of 1K to 20KHz, and measure the lateral three-sided full-frequency superposition audio signals corresponding to phase A, which are: ∑n,1, ∑n,2 and ∑n,3 respectively; Step S3, determining whether the full-frequency superimposed audio signal is greater than Max n1, if yes, surface corona discharge occurs, and the location of surface corona discharge is located, otherwise, surface corona discharge does not occur; Repeat steps S2 to S3 to detect and locate phase B and phase C.

2. A superposition detection method for surface corona discharge of high-voltage electrical equipment according to claim 1, characterized in that: The vertical distance between the sounding end of the superimposed sounder device and the center line of the opposite side of the high-voltage electrical equipment under test is greater than the set distance.

3. A superposition detection method for surface corona discharge of high-voltage electrical equipment according to claim 1, characterized in that: The sound-generating end of the superimposed sound generator device faces the end surface of the high-voltage electrical equipment.

4. A superposition detection method for surface corona discharge of high-voltage electrical equipment according to claim 1, characterized in that: If it is determined in step S3 that surface corona discharge occurs, the method further comprises emitting multi-band sound waves within 1K to 20KHz for detection to analyze the degree of insulation degradation of the discharge.

5. A superposition detection method for surface corona discharge of high-voltage electrical equipment according to claim 4, characterized in that: The multiple frequency bands include 1K~6KHz, 5K~11KHz, 10K~16KHz and 15K~20KHz.

6. The superposition detection method for surface corona discharge of high-voltage electrical equipment according to claim 1, characterized in that: The location of the surface corona discharge is located according to the frequency and amplitude of the waveform superimposed signal corresponding to each superimposed sound generator device.

7. A superposition detection method for surface corona discharge of high-voltage electrical equipment according to claim 6, characterized in that: The waveform superposition effect occurs in the same frequency band as the surface corona discharge, and the amplitude after superposition increases, changing the original fluctuating waveform into a nearly horizontal line.

8. A superposition detection method for surface corona discharge of high-voltage electrical equipment according to claim 6, characterized in that: After the superimposed sound generator device finishes playing the audio in the frequency band where the partial discharge is located, it returns to a fluctuating waveform.

9. An electronic device comprising a memory and a processor, wherein a computer program is stored in the memory, wherein: When the processor executes the program, the method according to any one of claims 1 to 8 is implemented.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, the method according to any one of claims 1 to 8 is implemented.

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