Superimposed detection method and electronic device for surface corona discharge of high-voltage electrical apparatus

Abstract

The present application relates to a kind of superimposed detection method and electronic equipment for high-voltage electrical equipment surface corona discharge, three superimposed sounder devices are placed on the lateral three sides of high-voltage electrical equipment, and the superimposed audio signal data is received by partial discharge detector on the lateral fourth side, the method comprises: measuring the surface corona discharge signal Max n1 of high-voltage electrical equipment;In turn open each superimposed sounder device, emit 1K~20KHz sound wave, measure the three full-frequency superimposed audio signals corresponding to phase A, respectively: ∑n,1, ∑n,2 and ∑n,3;Determine whether full-frequency superimposed audio signal is greater than Max n1, if yes, surface corona discharge occurs, and the site of surface corona discharge is positioned, otherwise, surface corona discharge does not occur;Repeat the above steps, detect and position phase B and phase C.Compared with prior art, the present application has the advantages of being able to detect surface corona discharge in time and acutely, and positioning the site of surface corona discharge, as well as predicting the degree of insulation deterioration.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of high-voltage electrical equipment surface corona discharge detection, and particularly relates to a superimposed detection method for surface corona discharge of high-voltage electrical equipment. BACKGROUND

[0002] In a power system, partial discharge may occur in high-voltage electrical equipment such as a high-voltage switch cabinet, a full-metal busbar box and a through-floor bushing. The partial discharge phenomenon is a phenomenon of arc discharge or corona discharge in a local area of electrical equipment. When the partial discharge occurs, high-frequency electromagnetic waves, ultra-high-frequency electromagnetic waves, ultrasonic waves, infrared light, ultraviolet light and ozone gas are simultaneously generated. Currently, common partial discharge detection technologies include an ultrasonic wave method (AE), a transient earth voltage method (TEV) and an ultra-high-frequency method (UHF). In recent years, the partial discharge detection-based live detection technology has been increasingly applied.

[0003] However, the following problems are found in the process of carrying out the partial discharge detection on site.

[0004] a) Weak signal quantity and external interference: The main reason for the unsatisfactory on-site detection effect is that there are many external strong electromagnetic interference sources, and it is difficult to remove and prevent the external electromagnetic interference by simply relying on hardware technology. Meanwhile, the collected signal quantity is weak, and the amplitude is very small, which is easily submerged by background noise.

[0005] b) Full-closed metal shielding effect: When weak partial discharge occurs in a switch cabinet, a full-metal busbar box and a full-metal combined electrical apparatus, the weak partial discharge cannot be timely discovered and detected due to the shielding effect of the full-closed metal container on electromagnetic waves.

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

[0007] The busbar refers to the connection of various voltage distribution devices at each level in a substation and the connection of electrical equipment such as a transformer and corresponding distribution devices. The busbar plays a role of collecting, distributing and transmitting electric energy by connecting various current branch circuits in the distribution device together, and is an important device of the substation.

[0008] Currently, the closed busbar used in the power distribution station only has the general sealing function, which can prevent large foreign matters from entering, but cannot effectively separate dust, moisture in the outside air and temperature in the busbar box. After a period of operation, the following faults may occur:

[0009] 1) The surface of the running support insulator will be accumulated with dust, which will cause the insulation to be reduced. In humid or other abnormal weather conditions, the outside humid air will enter the box. When the busbar stops running or the support insulator is cooled by radiation at night, its temperature is lower than that of the surrounding air, the surface of the support insulator will absorb moisture or dew. Condensation can easily form a completely humidified state on all parts of the support insulator. In a humid environment, the ionizable substances in the dirty insulator layer will gradually dissolve in water. A layer of conductive water film is formed 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 absorb water. This water film forms a conductive path along the surface of the insulator, allowing leakage current to pass through the surface of the insulator, resulting in a significant reduction in the insulation performance of the busbar, and further causing partial discharge.

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

[0011] 3) There is an insulating paint layer on each phase conductor of the common box busbar, which is to improve the insulation level between the conductor and the support insulator. However, with the increase of service life, the insulation layer will gradually age or oxidize, peel off from the conductor, and cause the conductor to leak. When encountering special, special climate environment changes, it is easy to cause discharge short circuit accident.

[0012] The partial discharge phenomenon of the equipment in the box occurs when the field strength increases due to the surface layer of the supporting insulator caused by dust or contamination and the like in the box-shaped bus, and the gas breakdown field strength is reached. Among them: surface discharge: the solid dielectric used to fix and support the charged part in the electrical equipment is mostly in the air. When the voltage exceeds a certain limit, the surface discharge phenomenon along the surface of the solid dielectric often occurs at the interface between the solid dielectric and the air, which is called surface discharge. Air gap discharge: due to the defects of process and material in the process of processing the insulating medium, impurities or air gaps will exist in the insulating body, forming defects in the insulating medium. Generally, the air gap is filled with air or carbon hydrogen gas, and the pressure is close to atmospheric pressure. When the external alternating high voltage is applied, the insulating defects will occur locally and repeatedly. Corona discharge: corona discharge often occurs in areas with high electric field strength in non-uniform electric field. The electric charge density is large at the small curvature radius of the conductor shell, especially at the sharp end. The electric field is proportional to the charge density at the surface adjacent to the charged body, so the field strength at the sharp end of the conductor is very strong. Therefore, when the potential of the conductor around the air is raised, corona discharge may occur at these sharp ends.

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

[0014] How to realize sensitive detection of surface corona discharge of high-voltage electrical equipment becomes a technical problem to be solved. SUMMARY

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

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

[0017] According to one aspect of the present application, a superimposed detection method for surface corona discharge of high-voltage electrical equipment is provided, and a superimposed sounder device is arranged on each of the three lateral sides of the high-voltage electrical equipment, and a partial discharge detector is used to receive superimposed audio signal data on the fourth lateral side. The method comprises the following steps:

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

[0019] Step S2, sequentially turning on each superimposed sounder device to emit sound waves with a frequency of 1K-20KHz, and measuring the full-frequency superimposed audio signals of the three lateral sides corresponding to phase A, which are ∑n,1, ∑n,2 and ∑n,3, respectively.

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

[0021] Steps S2-S3 are repeated to detect and locate the B phase and the C phase.

[0022] Preferably, the sound emitting end of the superimposed sound emitter device is vertically away from the center line of the high-voltage electrical equipment by a distance greater than a set distance.

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

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

[0025] More preferably, the multi-frequency band comprises 1K-6KHz, 5K-11KHz, 10K-16KHz and 15K-20KHz.

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

[0027] More preferably, the waveform superimposition effect occurs in the same frequency band as the surface corona discharge, and the amplitude of the superimposed waveform increases, and the original fluctuating waveform becomes an approximately horizontal line.

[0028] More preferably, after the superimposed sound emitter device plays the audio in the frequency band of the partial discharge, the fluctuating waveform is restored.

[0029] According to another aspect of the present application, an electronic device is provided, comprising a memory and a processor, the memory stores a computer program, and the processor executes the program to realize the method.

[0030] According to a third aspect of the present application, a computer readable storage medium is provided, which stores a computer program, and the program is executed by a processor to realize the method.

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

[0032] 1) The invention is to deploy superimposed generator devices on three sides of high-voltage equipment suspected of partial surface corona discharge, and use a partial discharge detector on the fourth side to receive superimposed audio signal data. The superimposed generator device emits audio signals, and produces a frequency superposition effect at the discharge frequency point. The originally weak partial discharge produces a clear frequency superposition effect after superposition, which can timely and sensitively detect surface corona discharge and locate the position of surface corona discharge.

[0033] 2) The invention uses multiple frequency bands of sound waves to detect and predict the degree of insulation deterioration of partial corona discharge. The lower the discharge frequency, the more serious the insulation deterioration.

[0034] 3) The high-pitched loudspeaker of the superimposed sound generator device faces the high-voltage electrical equipment being measured, but does not directly face the high-voltage electrical equipment being measured, that is, it is offset from the high-voltage electrical equipment by a certain distance to avoid interference with the measurement. BRIEF DESCRIPTION OF DRAWINGS

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

[0036] Figure 2 is a characteristic diagram of surface corona discharge frequency sound waves in the invention;

[0037] Figure 3 is a frequency characteristic diagram of the superposition of surface corona discharge frequency sound waves and actively emitted 50db sound waves;

[0038] Figure 4 is a frequency characteristic diagram of the superposition of surface corona discharge frequency sound waves and actively emitted 75db sound waves;

[0039] Figure 5 is a schematic diagram of the placement position of each device during surface corona discharge testing in the invention;

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

[0041] Figure 6 is a characteristic diagram of surface corona discharge frequency sound waves in the invention;

[0042] Figure 7 is a characteristic diagram of surface corona discharge frequency sound waves in the invention;

[0043] Figure 8 is a flowchart of surface corona discharge detection in the invention. DETAILED DESCRIPTION

[0044] With reference to the drawings of the embodiments of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by a person of ordinary skill in the art without creative effort should fall within the protection scope of the present application.

[0045] Embodiment 1

[0046] In view of the above problems, the present application combines the superposition principle with partial discharge detection to indirectly measure the weak discharge in the bus box, while ensuring that the monitoring device does not affect the safe operation of the circuit breaker and the power grid. The research results have better implementation conclusions in detecting the fully enclosed bus box, and are a new detection method.

[0047] The superposition principle of waves refers to when several waves propagate in the same medium, if they meet at a certain place in space, the vibration of the particles at the meeting place is the superposition of the vibrations caused by each wave. At any time, the displacement of the particle is the vector sum of the displacements caused by each wave. After several 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 have not met other waves on their way. It is also called the independence principle of waves. Specifically, the wave superposition principle states 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 superimposed waveform. This principle can be extended to any number of waveforms, for example, three waveforms y1(t), y2(t) and y3(t) superimposed together are: 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 interaction of multiple waveforms [3] and has applications in many fields, such as electromagnetic wave communication, acoustics, optics, etc. In acoustics, the principle of wave superposition is used to describe the influence of multiple sound sources on the sound heard by a listener. This principle can also be applied to various types of waveforms, such as electromagnetic waves, sound waves, etc.

[0049] According to the principle of wave superposition, when there are two or more sound sources in space, the sound waves emitted by each sound source will not change their propagation rules due to the presence of other sound waves. However, the wave motion at a certain position in space is the superposition of the vibrations excited by each wave at that point.

[0050] This embodiment relates to a superposition detection method for surface corona discharge in high-voltage electrical equipment. It is suitable for detection in 110 kV busbar boxes or operating equipment environments. For the safety of personnel and to prevent electrostatic transmission in operating equipment environments, the housing of the superposition generator used for detection must be made of insulating material.

[0051] The superposition generator actively emits a sound wave frequency, which superimposes with the frequency of local corona discharge. Since the frequency of surface corona discharge is mostly concentrated between 6K and 15kHz, the superposition generator actively emits a sound wave frequency of 1K to 20KHz to ensure the accuracy of the emitted high-frequency sound. Figure 1 The green area represents the acoustic wave characteristics of the corona discharge frequency along the surface, while the red area represents the acoustic wave frequency characteristics superimposed on the actively emitted 1K~20kH acoustic waves.

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

[0053] Figure 2 For the acoustic characteristics of surface corona discharge frequency, Figure 3 The 50dB superimposed frequency characteristics of the transmission Figure 4 The 75dB superimposed frequency characteristics of the transmission are calculated as follows:

[0054] Lg(n1+Δn)>Lgn1

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

[0056] At three locations Δn1, Δn2, and Δn3, an acoustic wave signal is actively emitted, which is superimposed on the acoustic wave signal generated by 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] Wherein, 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, in the high-voltage electrical equipment side to the three sides of the front of each put a superimposed sounder device, its loudspeaker mouth towards the high-voltage electrical equipment, such as Δn1, Δn2 and Δn3 in the position, in the fourth direction with the local emission detector to receive superimposed audio signal data. In turn open three sides of the superimposed sounder device for detection. The occurrence of the superimposed sounder device (high sound loudspeaker mouth) towards the measured high-voltage electrical equipment, but avoid directly opposite the measured high-voltage electrical equipment. High sound loudspeaker mouth and the measured high-voltage electrical equipment directly opposite the center line of the vertical distance at least meet the set distance. If the superimposed sounder device directly opposite the high-voltage electrical equipment, the measurement is disturbed.

[0060] As Figure 5 (a), in the Δn4 position next to the test position actively emits sound waves, the superimposed waveform has no obvious change, so there is no need to actively emit sound wave signals in the Δn4 position. Δn4 position will seriously interfere with the local emission detector, actively emit sound waves will not be superimposed with the corona discharge sound wave inside the high-voltage electrical equipment, on the contrary, shielding the corona discharge sound wave inside the high-voltage electrical equipment. Figure 6 For full-wave scanning along the surface of the corona discharge frequency sound wave characteristics, Figure 7 For Δn4 position superimposed active emission of sound waves after full-wave scanning frequency sound wave characteristics.

[0061] Each superimposed sounder device detects the method of along the surface of the corona discharge as Figure 8 , comprising the following steps:

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

[0063] Step S2, open the superimposed sounder device, emit 1K~20KHz sound waves, measure 1K~20KHz corresponding to the A phase of the full frequency superimposed audio signal, that is, ∑n,1

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

[0065] Step S4, if yes, the along surface corona discharge occurs, otherwise, no along surface corona discharge occurs.

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

[0067] Similarly, in turn emit 1K~6KHz, 5K~11KHz, 10K~16KHz, 15K~20KHz frequency band of sound waves, get the corresponding A phase, B phase and C phase of the full frequency superimposed audio signal, analyze the test results, output the corresponding frequency and amplitude of discharge.

[0068] The device uses multi-segment frequency to emit sound waves for testing. If multiple partial discharges occur in high-voltage electrical appliances, such as the pollution surface corona discharge of a 35KV high-voltage bushing, and the corona discharge occurs in multiple segments of the skirt, the traditional partial discharge instrument can only detect the discharge index or waveform and cannot show how many discharges occur. In contrast, the device uses multi-segment frequency segmentation for superimposed testing, which can easily determine the number of discharges based on the number of superpositions. By using multi-segment superimposed frequency output, the degree of insulation deterioration of partial corona discharge can be predicted. Generally, the lower the discharge frequency, the more severe the insulation deterioration.

[0069] Embodiment 2

[0070] This embodiment also relates to the application of the superimposed sound emitter device for detecting surface corona discharge of high-voltage electrical appliances. The project team conducted on-site partial surface corona discharge superimposed detection work at a 35-kilovolt station.

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

[0072] The project team placed the superimposed sound emitter device of the present application in front of the lead wire warehouse side, with the horn opening direction of the superimposed sound emitter device facing the inside of the lead wire warehouse.

[0073] Firstly, the superimposed sound emitter device emits 1K-20K frequency, and the waveform of B-phase on the partial discharge detector has obvious fluctuation and becomes a horizontal line, with the amplitude increasing significantly, which is obviously larger than the amplitude of the detection frequency without superposition. After the audio frequency of the frequency range of the partial discharge is played, the waveform returns to normal. Meanwhile, the normal A and C phases without corona discharge bushing detection frequency waveform have no change. At the same time, using a high-sensitivity full-frequency detector, it is found that from the start frequency of superposition, the frequency spectrum gradually rises and falls, and at a certain point frequency, the segment frequency spectrum rises and falls, which is consistent with the detection results of the partial discharge detector.

[0074] Then, the superimposed sound emitter device superimposes and detects four segments of 1K-6K, 5K-11K, 10K-16K, and 15-20K frequencies respectively, and finds that the surface corona discharge frequency of the B-phase through-floor bushing occurs in the range of 6K-8K.

[0075] Through on-site superimposed detection, it is found that when partial corona discharge occurs in a fully enclosed metal space (busbar box), the same frequency sound produces a superimposed effect, producing a superimposed audio frequency greater than the discharge frequency amplitude, which is easy to be detected by a partial discharge instrument or a full-range audio frequency detector.

[0076] Embodiment 3

[0077] The embodiment also relates to a positioning detection method for a surface corona discharge part of a high-voltage electrical apparatus.

[0078] When a corona discharge occurs in a high-voltage electrical apparatus, the position of the corona discharge cannot be accurately positioned. For example, a station through a floor bushing, a partial discharge detector detects that the discharge waveforms of A-phase and C-phase bushings are normal and the discharge waveform of B-phase bushing is abnormal outside the lead wire bin (charged equipment bin), and can detect that a corona discharge occurs in the B-phase bushing, but cannot accurately position the discharge position.

[0079] The method can solve the positioning of the surface corona discharge position of the partial discharge.

[0080] For example, Figure 5 In the lateral three sides of the high-voltage electrical apparatus, full-band audio signals are emitted, and the partial discharge detector is used to detect and record the time of waveform superposition in the direction of the fourth lateral side. According to the time and intensity of the waveform superposition effect, the position of the bushing discharge is obtained. Note that the loudspeaker of the superimposed sound generator device faces the measured high-voltage electrical apparatus, but avoids directly facing the measured high-voltage electrical apparatus. If the superimposed sound generator device directly faces the high-voltage electrical apparatus, it will interfere with the measurement. According to the attenuation of sound waves in air, the experimental conclusion is that the perpendicular distance from the center line of the measured high-voltage electrical apparatus is greater than 0.5 meters, and the sound wave of the generator will not directly interfere with the test.

[0081] According to the corresponding waveform superposition signal frequency and amplitude of each superimposed sound generator device, the position of the surface corona discharge is positioned. Specifically, for the same frequency band, if the amplitude of the superimposed signal at Δn1 position > the amplitude of the superimposed signal at Δn3 position > the amplitude of the superimposed signal at Δn2 position, the partial discharge position is positioned close to Δn1 position and far away from Δn2 position.

[0082] Embodiment 4

[0083] The electronic device of the present application includes a central processing unit (CPU) that can perform various appropriate actions and processes according to computer program instructions stored in a read-only memory (ROM) or computer program instructions 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 through a bus. An input / output (I / O) interface is also connected to the bus.

[0084] A number of components in the device are connected to the I / O interface, including: input units, such as a keyboard, a mouse, etc.; output units, such as various types of displays, speakers, etc.; storage units, such as a magnetic disk, an optical disk, etc.; and communication units, such as a network card, a modem, a wireless communication transceiver, etc. The communication units allow the device to exchange information / data with other devices through a computer network, such as the Internet, and / or various telecommunication networks.

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

[0086] The functions described above in this document can be performed, at least in part, by one or more hardware logic components. For example, and without limitation, illustrative types of hardware logic components that can be used include: field-programmable gate arrays (FPGAs), application-specific integrated circuits (ASICs), application-specific standard products (ASSPs), system-on-a-chip systems (SOCs), complex programmable logic devices (CPLDs), etc.

[0087] Program code for carrying out methods of the present application can be written in any combination of one or more programming languages. This program code can be provided to a processor or controller of a general purpose computer, special purpose computer, or other programmable data processing apparatus, such that the program code, when executed by the processor or controller, causes the functions / operations specified in the flow charts and / or block diagrams to be implemented. The program code can execute entirely on a machine, partly on the machine, as a stand-alone software package, partly on the machine and partly on a remote machine or entirely on the remote machine or server.

[0088] In the context of the present application, a machine-readable medium can be a tangible medium that can contain or store a program for use by or in connection with an instruction execution system, apparatus, or device. The machine-readable medium can be a machine-readable signal medium or a machine-readable storage medium. Machine-readable storage media can include, without limitation, electronic, magnetic, optical, electromagnetic, infrared, or semiconductor systems, apparatus, or devices, or any suitable combination of the foregoing. More specific examples of machine-readable storage media can include one or more lines of electrical wire, portable computer disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or Flash memory), optical fiber, portable compact disc read-only memory (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination of the foregoing.

[0089] The above description is only specific embodiments of the present application, but the protection scope of the present application is not limited thereto, and any person skilled in the art can easily think of various equivalent modifications or replacements within the technical scope disclosed by the present application, and these modifications or replacements should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A method for superposition detection of a surface corona discharge of a high voltage electrical apparatus, characterized in that, The method comprises the following steps: Step S1, measuring the along-surface corona discharge signal Max n1 of the high-voltage electrical equipment; Step S2, opening each superimposed sounder device in turn, emitting 1K-20KHz sound waves, and measuring the full-frequency superimposed audio signals of the three lateral sides corresponding to phase A, respectively ∑n,1, ∑n,2 and ∑n,3; Step S3, judging whether the full-frequency superimposed audio signals are greater than Max n1, if yes, the along-surface corona discharge occurs and the position of the along-surface corona discharge is located, otherwise, the along-surface corona discharge does not occur; Steps S2-S3 are repeated to detect and locate phase B and phase C.

2. The method for superimposed detection of a surface corona discharge in a high voltage electrical device according to claim 1, characterized in that The sound-emitting end of the superimposed sounder device is vertically away from the center line of the opposite face of the high-voltage electrical equipment by a distance greater than a set distance.

3. The method for detecting superimposed surface corona discharge of high voltage electrical apparatus according to claim 1, wherein The sound-emitting end of the superimposed sounder device faces the end face of the high-voltage electrical equipment.

4. The method for detecting superimposed surface corona discharge of high voltage electrical apparatus according to claim 1, wherein If the along-surface corona discharge occurs in step S3, the method further comprises emitting multi-frequency band sound waves within 1K-20KHz for detection to analyze the insulation deterioration degree of the discharge.

5. The method for superimposed detection of a surface corona discharge in a high voltage electrical device according to claim 4, characterized in that The multi-frequency band comprises 1K-6KHz, 5K-11KHz, 10K-16KHz and 15K-20KHz.

6. The method for superposition detection of a surface corona discharge of a high voltage electrical device according to claim 1, characterized in that The position of the along-surface corona discharge is located according to the frequency and amplitude of the waveform superimposed signals corresponding to each superimposed sounder device.

7. The method for detecting superposition of surface corona discharge in high voltage electrical apparatus according to claim 6, wherein The waveform superimposition effect occurs in the same frequency band as the along-surface corona discharge, and the amplitude after superimposition increases, and the original fluctuating waveform becomes an approximately horizontal line.

8. The method for detecting superposition of surface corona discharge of high voltage electrical apparatus according to claim 6, wherein After the superimposed sounder device plays the audio of the frequency band of the partial discharge, it returns to the fluctuating waveform.

9. An electronic device comprising a memory and a processor, said memory having stored thereon a computer program, characterized in that, The processor executes the program to implement the method of any one of claims 1-8.

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

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