Insulation electrical equipment partial discharge detection device and method

Abstract

The invention provides a partial discharge detection device and method for insulated electrical equipment, and the device comprises a device main body which is provided with a simulation cavity which is used for accommodating a to-be-detected electrode piece and is filled with an insulating medium, and the device main body is internally provided with a discharge assembly which is at least partially located in the simulation cavity, so as to simulate the to-be-detected electrode piece to discharge; the optical detection assembly is connected with the device main body, communicates with the interior of the simulation cavity and is used for acquiring an optical signal generated in the simulation cavity in the discharging process and converting the optical signal into an electric signal; the electrical detection assembly is connected with the discharge assembly and is used for acquiring a plurality of electrical signals generated in the simulation cavity in the discharge process; and the signal display is respectively connected with the optical detection assembly and the electrical detection assembly and is used for analyzing a plurality of electrical signals acquired by the optical detection assembly and the electrical detection assembly to obtain the partial discharge defect state of the to-be-detected electrode piece. The problem that in the prior art, the accuracy of detecting the partial discharge defect of the insulated electrical equipment is low is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of partial discharge defect detection of insulated electrical equipment, and more particularly, to a partial discharge detection device and method for insulated electrical equipment. Background Art

[0002] At present, with the upgrading and expansion of the power system, ensuring the reliability and safety of electrical equipment has become an important issue in the power industry. In high-voltage, extra-high-voltage and even ultra-high-voltage power transmission and distribution networks, clean air-insulated switchgear has been widely used due to its environmental and economic advantages. However, these devices operate in harsh environments for a long time, and the degradation of the insulation medium performance, especially the generation of partial discharge defects, poses a major threat to the stability and safety of the power system. Therefore, accurately and quickly detecting and diagnosing partial discharge defects is crucial for maintaining the healthy operation of the power system.

[0003] In the prior art, the detection methods for partial discharge defects involve multiple fields such as optics, electricity and chemistry. Among them, optical detection technology has been widely used in the identification of partial discharges due to its non-contact and on-line monitoring characteristics, as well as its strong anti-electromagnetic interference ability. Electrical detection technology relies on capturing the changes in current and voltage waveforms and exhibits the advantage of high sensitivity. However, its direct-contact detection method is easily affected by electromagnetic interference and environmental noise, resulting in errors in the detection results.

[0004] However, the following problems exist in the prior art: In a strong light environment, the sensitivity of optical detection will drop significantly, making it difficult to capture weak discharge light signals. This limitation is more obvious especially in outdoor or indoor environments with high light intensity. At the same time, although electrical detection has high sensitivity, due to the need to establish a physical connection with electrical equipment, it is extremely vulnerable to electromagnetic interference and environmental noise. Especially under high-voltage and complex electromagnetic environment conditions, the challenge of detection accuracy is particularly severe. Summary of the Invention

[0005] The main object of the present invention is to provide a partial discharge detection device and method for insulated electrical equipment, so as to solve the problem of low accuracy in detecting partial discharge defects of insulated electrical equipment in the prior art.

[0006] To achieve the above object, according to one aspect of the present invention, there is provided a partial discharge detection device for an insulated electrical equipment, including: a device main body having a simulation cavity for accommodating a to-be-tested electrode member and filling an insulating medium, and a discharge assembly at least partially located in the simulation cavity in the device main body for simulating discharge of the to-be-tested electrode member; an optical detection assembly connected to the device main body and at least part of the optical detection assembly communicating with the inside of the simulation cavity for acquiring an optical signal generated during the discharge process in the simulation cavity and converting it into an electrical signal; an electrical detection assembly connected to the discharge assembly for acquiring a plurality of electrical signals generated during the discharge process in the simulation cavity; and a signal display respectively connected to the optical detection assembly and the electrical detection assembly for analyzing the plurality of electrical signals acquired by the optical detection assembly and the electrical detection assembly to obtain the partial discharge defect state of the to-be-tested electrode member.

[0007] Further, the discharge assembly includes: a high-voltage discharge part and a low-voltage discharge part oppositely arranged in the simulation cavity, the to-be-tested electrode member is arranged between the high-voltage discharge part and the low-voltage discharge part, one end of the high-voltage discharge part is connected with a high-voltage terminal through a guide rod, and the high-voltage terminal is connected with a power transmission assembly for outputting high-voltage electricity to the high-voltage discharge part; one end of the low-voltage discharge part extending out of the simulation cavity is connected with a low-voltage terminal for grounding.

[0008] Further, the device main body is provided with an installation opening communicating with the simulation cavity, and the optical detection assembly includes: a fixing plate provided with a plurality of connection holes along its circumferential direction for installing the fixing plate at the installation opening on the device main body through the plurality of connection holes; a through hole provided on the fixing plate; a connecting pipe, one end of the connecting pipe is connected with the through hole, the other end of the connecting pipe is provided with a convex lens, and a signal connecting member is arranged in the connecting pipe and at least part of the signal connecting member extends into the simulation cavity.

[0009] Further, the optical detection assembly further includes: a photomultiplier tube respectively connected to the signal connecting member in the connecting pipe and the signal display through connection lines for collecting optical pulses generated during the discharge process in the simulation cavity, enhancing the optical signal, and converting the optical signal into an electrical signal and transmitting it to the signal display.

[0010] Further, an insulating member is arranged in the device main body, and the insulating member and a part of the inner wall of the device main body enclose the simulation cavity. The electrical detection assembly includes: a UHF sensor arranged on the device main body and connected to the insulating member, and the UHF sensor is connected to the signal display through a connection line for monitoring electromagnetic waves generated during the discharge process in the simulation cavity and transmitting them to the signal display.

[0011] Further, the electrical detection component includes: a high-voltage probe, one end of the high-voltage probe is connected to the high-voltage terminal, the housing of the high-voltage probe is grounded, and the other end of the high-voltage probe is connected to the signal display through a connecting wire, so as to synchronously obtain a sine reference signal and transmit it to the signal display when the power transmission component outputs high-voltage electricity to the high-voltage terminal.

[0012] Further, the power transmission component includes: a transformer; a capacitor, which is connected to the transformer through a resistor, and one end of the capacitor is connected to the high-voltage terminal through a connecting wire, so as to output high-voltage electricity to the high-voltage terminal.

[0013] Further, the electrical detection component includes: a current detector, the first end of the current detector is connected to the capacitor, the second end of the current detector is grounded, and the third section of the current detector is connected to the signal display through a connecting wire, so as to obtain a pulse current signal when the power transmission component outputs high-voltage electricity to the high-voltage terminal and transmit it to the signal display.

[0014] Further, the partial discharge detection device for insulated electrical equipment further includes: an air extraction component, which is communicated with the simulation cavity to evacuate the simulation cavity; and / or, a ventilation component, which is communicated with the simulation cavity to fill the simulation cavity with an insulating medium.

[0015] According to another aspect of the present invention, there is provided a method for detecting partial discharge of an insulated switch, which is applicable to the above-mentioned partial discharge detection device for insulated electrical equipment. The detection method includes: controlling the test electrode component in the simulation cavity to discharge after filling the simulation cavity with an insulating medium; controlling the optical detection component to obtain the optical signal generated during the discharge process in the simulation cavity and convert it into an electrical signal; controlling the electrical detection component to obtain a plurality of electrical signals generated during the discharge process in the simulation cavity; analyzing the plurality of electrical signals collected by the optical detection component and the electrical detection component through the signal display to obtain the partial discharge limit distribution state of different test electrode components.

[0016] Applying the technical solution of the present invention, there is provided a partial discharge detection device for insulated electrical equipment, including a device main body, an optical detection component, an electrical detection component and a signal display; the device main body has a simulation cavity for accommodating a test electrode component and filling an insulating medium, and a discharge component at least partially located in the simulation cavity is provided in the device main body to simulate the discharge of the test electrode component; the optical detection component is connected to the device main body and at least part of the optical detection component is communicated with the simulation cavity to obtain the optical signal generated during the discharge process in the simulation cavity and convert it into an electrical signal; the electrical detection component is connected to the discharge component to obtain a plurality of electrical signals generated during the discharge process in the simulation cavity; the signal display is respectively connected to the optical detection component and the electrical detection component to analyze the plurality of electrical signals obtained by the optical detection component and the electrical detection component to obtain the partial discharge defect state of the test electrode component.

[0017] With the technical solution of the present invention, an optical detection component is used to collect the light pulses radiated during the discharge process in the simulation cavity and convert them into electrical signals; an electrical detection component obtains the pulse current, ultra-high frequency signal, and sine reference signal in the partial discharge defect during the discharge process in the simulation cavity. Furthermore, a signal analyzer synchronously collects the optical and electrical signals generated by the partial discharge defect, and discriminates and monitors the discharge through the partial discharge defect phase distribution map. By combining optical detection and electrical detection, the present invention improves the sensitivity and accuracy of partial discharge defect detection, reduces the problem of the influence of external light on optical detection, and at the same time reduces the influence of electromagnetic interference and environmental noise on the detection result in electrical detection, thereby solving the problem of low accuracy in detecting partial discharge defects of insulating electrical equipment in the prior art. This combined detection method not only enhances the reliability of detection, but also realizes more accurate fault monitoring and diagnosis, which helps to ensure the safe operation of the power system. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings forming a part of this application are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention. In the drawings:

[0019] Figure 1 Shows the overall structural schematic diagram provided by the embodiment of the partial discharge detection device for insulating electrical equipment according to the present invention;

[0020] Figure 2 Shows the structural schematic diagram of the optical detection component provided by the embodiment of the partial discharge detection device for insulating electrical equipment according to the present invention;

[0021] Figure 3 Shows the partial discharge phase distribution map of spike discharge provided by the embodiment of the partial discharge detection device for insulating electrical equipment according to the present invention;

[0022] Figure 4 Shows the partial discharge phase distribution map of surface discharge provided by the embodiment of the partial discharge detection device for insulating electrical equipment according to the present invention;

[0023] Figure 5 Shows the partial discharge phase distribution map of floating discharge provided by the embodiment of the partial discharge detection device for insulating electrical equipment according to the present invention.

[0024] Among them, the above-mentioned accompanying drawings include the following reference numerals:

[0025] 1. Electrode component to be measured; 10. Device main body; 11. Simulation chamber; 12. Installation port; 13. Insulating component; 20. Discharge component; 21. High-voltage discharge part; 22. Low-voltage discharge part; 23. Guide rod; 24. High-voltage terminal; 25. Low-voltage terminal; 30. Optical detection component; 31. Fixed plate; 310. Connection hole; 311. Through hole; 32. Connecting pipe; 33. Convex lens; 34. Photomultiplier tube; 40. Electrical detection component; 41. Ultra-high frequency sensor; 42. High-voltage probe; 43. Current detection component; 50. Signal display; 60. Power transmission component; 61. Transformer; 62. Capacitor; 63. Resistor. Detailed implementation manners

[0026] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the drawings and in combination with the embodiments.

[0027] In order to solve the problem of low accuracy in detecting partial discharge defects of insulating electrical equipment in the prior art, the present invention provides a partial discharge detection device and method for insulating electrical equipment.

[0028] Please refer to Figures 1 to 5 As shown, one aspect of the present invention provides a partial discharge detection device for insulating electrical equipment, including a device main body 10, an optical detection component 30, an electrical detection component 40 and a signal display 50; the device main body 10 has a simulation chamber 11 for accommodating the electrode component 1 to be measured and filling with an insulating medium, and at least part of the discharge component 20 is arranged in the device main body 10 and located in the simulation chamber 11 for simulating the discharge of the electrode component 1 to be measured; the optical detection component 30 is connected to the device main body 10 and at least part of the optical detection component 30 communicates with the inside of the simulation chamber 11 for obtaining the optical signal generated during the discharge process in the simulation chamber 11 and converting it into an electrical signal; the electrical detection component 40 is connected to the discharge component 20 for obtaining a plurality of electrical signals generated during the discharge process in the simulation chamber 11; the signal display 50 is respectively connected to the optical detection component 30 and the electrical detection component 40 for analyzing the plurality of electrical signals obtained by the optical detection component 30 and the electrical detection component 40 to obtain the partial discharge defect state of the electrode component 1 to be measured.

[0029] In one aspect of applying the technical solution of this embodiment, an optical detection component 30 collects optical pulses radiated during the discharge process in the simulation cavity 11 and converts them into electrical signals; an electrical detection component 40 acquires pulse current, ultra-high frequency signals, and sine reference signals in the partial discharge defect during the discharge process in the simulation cavity 11. Furthermore, a signal analyzer synchronously collects the optical and electrical signals generated by the partial discharge defect, and discriminates and monitors the discharge through a partial discharge defect phase distribution map. By combining optical detection and electrical detection, the present invention improves the sensitivity and accuracy of partial discharge defect detection, reduces the problem of optical detection being affected by external light, and at the same time reduces the influence of electromagnetic interference and environmental noise on the detection result in electrical detection, thereby solving the problem of low accuracy in detecting partial discharge defects of insulating electrical equipment in the prior art. This combined detection method not only enhances the reliability of detection, but also realizes more accurate fault monitoring and diagnosis, which helps to ensure the safe operation of the power system.

[0030] In this embodiment, the electrode component 1 to be measured is a needle-plate electrode, a surface discharge electrode, a floating potential electrode, etc., and is used to simulate the detection of partial discharge defects such as spikes, surface discharges, and floating potentials in a clean air-insulated switchgear.

[0031] In this embodiment, the signal display 50 is an oscilloscope; the insulating medium is clean air.

[0032] In this embodiment, the discharge component 20 includes a high-voltage discharge part 21 and a low-voltage discharge part 22. The high-voltage discharge part 21 and the low-voltage discharge part 22 are oppositely arranged in the simulation cavity 11. The electrode component 1 to be measured is arranged between the high-voltage discharge part 21 and the low-voltage discharge part 22. One end of the high-voltage discharge part 21 is connected with a high-voltage terminal 24 through a guide rod 23, and the high-voltage terminal 24 is connected with the power transmission component 60 to output high-voltage electricity to the high-voltage discharge part 21; one end of the low-voltage discharge part 22 extending out of the simulation cavity 11 is connected with a low-voltage terminal 25, and the low-voltage terminal 25 is used for grounding. The connection between the high-voltage terminal 24 and the power transmission component 60 enables the high-voltage terminal 24 to access a voltage of 0 to 100 kV. An insulator is provided between the high-voltage terminal 24 and the device main body 10, and the insulator is processed from silicone rubber material.

[0033] With the above settings, the high-voltage discharge part 21 and the low-voltage discharge part 22 are arranged opposite to each other, which can simulate the electric field distribution and voltage gradient during the actual operation of the electrical equipment. Especially when the electrode part to be measured 1 is placed between them, an environment similar to the occurrence of partial discharge in a real device can be formed, thus ensuring the accuracy and reliability of the detection results. The connection design between the high-voltage terminal 24 and the power transmission component 60 enables the device to precisely control and adjust the voltage output to the high-voltage discharge part 21, and flexible test conditions can be provided according to the detection requirements or to simulate partial discharge under different voltage levels, enhancing the adaptability and test range of the device. The grounding design of the low-voltage discharge part 22 effectively shields external electromagnetic interference, ensures the signal purity during the simulated discharge process, avoids the influence of environmental noise on the detection results, and improves the accuracy of signal detection.

[0034] As Figure 1 and Figure 2 shown, the device body 10 is provided with an installation port 12 communicating with the simulation cavity 11. The optical detection component 30 includes a fixing plate 31 and a connecting pipe 32; a plurality of connecting holes 310 are provided on the fixing plate 31 along its circumferential direction, so that the fixing plate 31 is installed at the installation port 12 on the device body 10 through the plurality of connecting holes 310; a through hole 311 is provided on the fixing plate 31; one end of the connecting pipe 32 is connected to the through hole 311, the other end of the connecting pipe 32 is provided with a convex lens 33, and a signal connector is arranged in the connecting pipe 32, and at least part of the signal connector extends into the simulation cavity 11. With the above settings, the fixing plate 31 is processed from 3mm stainless steel material, the signal connector is an SMA interface, and the convex lens 33, the connecting pipe 32 and the SMA interface are all made of fused quartz material and can transmit the emission spectrum from 200nm to 2000nm. In this way, the plurality of connecting holes 310 on the fixing plate 31 cooperate with the installation port 12 on the device body 10, ensuring that the optical detection component 30 can be accurately aligned with the simulation cavity 11, providing a stable installation method, and avoiding optical signal distortion caused by vibration or displacement during the detection process. The convex lens 33 at the end of the connecting pipe 32 can focus the optical signals generated in the simulation cavity 11, especially the weak optical pulses generated by partial discharge. The convex lens 33 concentrates these optical signals and enhances their intensity, facilitating the efficient detection by the subsequent photomultiplier tube 34 and improving the sensitivity and accuracy of optical detection. At least part of the signal connector in the connecting pipe 32 extends into the simulation cavity 11, which can directly and stably capture the optical signals and transmit them to the photomultiplier tube 34. This design reduces the loss and interference during the transmission of optical signals and ensures the reliability of the signal transmission from the simulation cavity 11 to the signal display 50.

[0035] Specifically, the optical detection component 30 further includes a photomultiplier tube 34. The photomultiplier tube 34 is respectively connected to the signal connector in the connecting tube 32 and the signal display 50 through connecting wires, so as to collect the light pulses generated during the discharge process in the simulation cavity 11, enhance the optical signal, and convert the optical signal into an electrical signal and transmit it to the signal display 50. The connecting wire between the photomultiplier tube 34 and the signal connector is a UV quartz optical fiber to transmit the collected optical signal to the photomultiplier tube 34.

[0036] With the above settings, the photomultiplier tube 34 has extremely high optical detection sensitivity and can capture the weak optical pulse signals generated during the partial discharge process in the simulation cavity 11. Even in a low-light environment, the photomultiplier tube 34 can significantly improve the ability of the device to detect partial discharge, ensuring the precise capture of tiny discharge events. Moreover, the photomultiplier tube 34 can not only detect optical signals but also significantly amplify the detected optical signals. This step is crucial for detecting weak partial discharge optical pulses because it converts the optical signal into an analyzable electrical signal for subsequent processing and display. This characteristic ensures that even the weakest optical signals can be effectively converted, improving the reliability of detection. At the same time, the signal conversion process of the photomultiplier tube 34 is not affected by the electromagnetic field. Therefore, it performs excellently in the detection of partial discharge in high-voltage and complex electromagnetic environments, capable of providing pure and interference-free signals, which is extremely critical in the field of power equipment detection, ensuring the accuracy and consistency of detection results.

[0037] In this embodiment, the partial discharge detection device for insulated electrical equipment further includes a host computer. The host computer is connected to the photomultiplier tube 34, and the host computer is used to control the opening of the photomultiplier tube 34 to adjust and increase the weak optical signal to an appropriate size.

[0038] Such as Figure 1As shown in the figure, an insulating member 13 is provided inside the device main body 10. The insulating member 13 and a part of the inner wall of the device main body 10 enclose an analog cavity 11. The electrical detection component 40 includes a UHF sensor 41. The UHF sensor 41 is arranged on the device main body 10 and connected to the insulating member 13. The UHF sensor 41 is connected to a signal display 50 through a connecting wire, so as to monitor the electromagnetic waves generated during the discharge process in the analog cavity 11 and transmit them to the signal display 50. The insulating member 13 is made of silicone rubber material, and the UHF sensor 41 is placed on the insulating member 13 and wound with a metal shielding tape. In this way, the UHF sensor 41 can capture the electromagnetic waves generated during the discharge process in the analog cavity 11. The signals in this frequency band are usually closely related to partial discharge activities. The UHF sensor 41 has high sensitivity and can detect weak electromagnetic fluctuations, which is crucial for early detection and location of partial discharge defects. At the same time, since the UHF sensor 41 is directly installed on the device main body 10 and is closely connected to the insulating member 13, this minimizes the propagation distance of the electromagnetic wave signal in the air, thereby reducing the possibility of signal attenuation and distortion, and ensuring the signal quality transmitted from the analog cavity 11 to the signal display 50.

[0039] Specifically, the electrical detection component 40 includes a high-voltage probe 42. One end of the high-voltage probe 42 is connected to the high-voltage terminal 24. The housing of the high-voltage probe 42 is grounded. The other end of the high-voltage probe 42 is connected to the signal display 50 through a connecting wire, so as to synchronously obtain a sine reference signal and transmit it to the signal display 50 when the power transmission component 60 outputs high-voltage electricity to the high-voltage terminal 24. The above setting enables the high-voltage probe 42 to capture the synchronous reference signal of the high-voltage electricity output from the power transmission component 60 to the high-voltage terminal 24. This signal is usually in the form of a sine wave. It provides a time reference for the signal display 50, enabling the electrical signals generated by partial discharge to be compared with the sine reference signal, which helps to determine the phase position of partial discharge and is crucial for analyzing the relationship between discharge and voltage peak. At the same time, the high-voltage probe 42 is directly connected to the signal display 50 through a connecting wire, and can transmit the obtained high-voltage electrical signals in real time, including the synchronous sine reference signal, which helps the signal display 50 to immediately analyze the signals and provide the detection results of partial discharge in a timely manner.

[0040] In this embodiment, the power transmission component 60 includes a transformer 61, a resistor 63, and a capacitor 62. The resistor 63 is connected between the capacitor 62 and the transformer 61. One end of the capacitor 62 is connected to the high-voltage terminal 24 through a connecting wire for outputting high-voltage electricity to the high-voltage terminal 24. In this way, through the step-up function of the transformer 61, the low-voltage power supply can be converted into high-voltage electricity, thereby providing the required high-voltage electrical energy for the discharge component 20. The series use of the resistor 63 can adjust the stability of the output voltage, control the amplitude and waveform of the high-voltage electricity, and ensure the controllability and safety of the discharge process. As an energy storage element, the capacitor 62 accumulates electrical energy during the charging process and then quickly releases it during discharge. This spike electrical pulse can simulate the electric field effect of partial discharge in the device under test 1, providing a test environment close to the actual partial discharge situation.

[0041] Specifically, the electrical detection component 40 includes a current detection component 43. The first end of the current detection component 43 is connected to the capacitor 62, the second end of the current detection component 43 is grounded, and the third section of the current detection component 43 is connected to the signal display 50 through a connecting wire for obtaining the pulse current signal when the power transmission component 60 outputs high-voltage electricity to the high-voltage terminal 24 and transmitting it to the signal display 50. Through the above settings, the current detection component 43 can directly monitor the pulse current signal generated when the capacitor 62 discharges to the high-voltage terminal 24, can capture the peak state of the current in real time, and provide direct evidence of partial discharge. And it is directly connected to the signal display 50 through a connecting wire, ensuring that the detected pulse current signal can be transmitted to the signal display 50 quickly and without loss, facilitating immediate analysis and processing, and contributing to the real-time monitoring and rapid response of partial discharge.

[0042] In this embodiment, the current detection component 43 is an impedance-type pulse current detection device, and the parallel method is used to measure the loop, with one end of the input impedance connected to the coupling capacitor 62.

[0043] In this application, the partial discharge detection device for insulated electrical equipment further includes an air extraction component. The air extraction component is communicated with the simulation chamber 11 for evacuating the simulation chamber 11. With the above settings, evacuating can create an environment close to vacuum or low pressure, which helps to reduce the influence of impurities and gases in the air on partial discharge detection. Molecules and impurities in the air may absorb or scatter light signals, affecting the light signal detection efficiency of the photomultiplier tube 34; at the same time, the discharge characteristics in the air medium may be different from the insulation medium environment of actual high-voltage electrical equipment. Evacuating can more accurately simulate the operating conditions of high-voltage electrical equipment and improve the accuracy and reliability of detection.

[0044] In this application, the partial discharge detection device for insulating electrical equipment further includes a ventilation component, which is connected to the simulation chamber 11 for filling an insulating medium into the simulation chamber 11. In this way, after evacuating the simulation chamber 11 two to three times, clean air is filled into the simulation chamber 11 through the ventilation component to simulate the operating environment of a real electrical equipment during the detection process, ensuring the accuracy and reliability of the detection results and providing a more practical data basis for subsequent equipment maintenance and fault prediction. Moreover, different insulating media have different effects on suppressing partial discharge and its characteristics. The ventilation component can fill different types of insulating media, which helps to study the influence of the media on partial discharge, including discharge patterns, discharge frequencies, and discharge intensities, etc. This has important scientific research value for optimizing the design of insulating electrical equipment and improving its insulation performance.

[0045] In this embodiment, before evacuating the simulation chamber 11, the inner wall of the simulation chamber 11 is wiped 2 - 3 times with a lint-free cloth dipped in anhydrous ethanol, and the simulation chamber 11 is sealed after drying.

[0046] According to another aspect of the present invention, a partial discharge detection method for an insulating switch is provided, which is applicable to the partial discharge detection device for insulating electrical equipment mentioned above. The detection method includes: controlling the test electrode component 1 in the simulation chamber 11 to discharge after filling an insulating medium into the simulation chamber 11; controlling the optical detection component 30 to acquire the optical signal generated during the discharge process in the simulation chamber 11 and convert it into an electrical signal; controlling the electrical detection component 40 to acquire multiple electrical signals generated during the discharge process in the simulation chamber 11; analyzing the multiple electrical signals collected by the optical detection component 30 and the electrical detection component 40 through the signal display 50 to obtain the partial discharge limit distribution state of different test electrode components 1. In this way, this method combines optical detection and electrical detection technologies and can collect the optical signal and electrical signal generated during the discharge process simultaneously. This comprehensive detection method provides multi-dimensional information, can more comprehensively reflect the characteristics of partial discharge, improves the accuracy and reliability of the detection, and solves the problem of low accuracy in detecting partial discharge defects of insulating electrical equipment in the prior art.

[0047] In this application, the specific detection process: the optical detection process is that the external spectral response enhancement module collects the optical pulses radiated during the discharge process and sends them to the photomultiplier tube 34 (PMT) to be converted into electrical signals; the electrical detection process includes that the impedance type pulse current detection device acquires the pulse current in the partial discharge defect, the ultra-high frequency sensor 41 (UHF) monitors the ultra-high frequency signal generated by the partial discharge defect, and the high-voltage probe 42 synchronously acquires the sine reference signal. The oscilloscope synchronously collects the optical and electrical signals generated by the partial discharge defect, and discriminates and monitors the discharge through the phase distribution map of the partial discharge defect.

[0048] As Figures 3 to 5As shown, they are the partial discharge phase distribution diagrams of spike discharge, surface discharge, and floating potential discharge respectively.

[0049] During the spike discharge process, the UHF, optical pulse, and pulse current signals first appear near 270° where it is easier to form corona. After that, as the applied voltage further increases, the signals start to appear near 90° in the positive half cycle.

[0050] During the surface discharge process, the UHF, optical pulse, and pulse current signals appear near 90° and 270° of the applied voltage, showing certain signal characteristics of corona discharge.

[0051] During the floating potential discharge process, the UHF, optical pulse, and pulse current signals all appear at the rising and falling edges of the positive and negative half cycles of the applied voltage. Compared with spike and surface discharges, the number of signal pulses of floating discharge is the least.

[0052] From the above description, it can be seen that the above embodiments of the present invention achieve the following technical effects:

[0053] The partial discharge detection device for insulated electrical equipment includes a device main body 10, an optical detection component 30, an electrical detection component 40, and a signal display 50; the device main body 10 has a simulation cavity 11 for accommodating the electrode component to be measured and filling with an insulating medium, and at least part of a discharge component 20 located in the simulation cavity 11 is provided in the device main body 10 for simulating the discharge of the electrode component to be measured; the optical detection component 30 is connected to the device main body 10 and at least part of the optical detection component 30 communicates with the inside of the simulation cavity 11 for acquiring the optical signal generated during the discharge process in the simulation cavity 11 and converting it into an electrical signal; the electrical detection component 40 is connected to the discharge component 20 for acquiring a plurality of electrical signals generated during the discharge process in the simulation cavity 11; the signal display 50 is respectively connected to the optical detection component 30 and the electrical detection component 40 for analyzing the plurality of electrical signals acquired by the optical detection component 30 and the electrical detection component 40 to obtain the partial discharge defect state of the electrode component to be measured. By adopting the technical solution of the present invention, the optical detection component 30 collects the optical pulses radiated during the discharge process in the simulation cavity 11 and converts them into electrical signals; the electrical detection component 40 acquires the pulse current, ultra-high frequency signal, and sine reference signal in the partial discharge defect during the discharge process in the simulation cavity 11. Furthermore, the signal analyzer synchronously acquires the optical and electrical signals generated by the partial discharge defect, and discriminates and monitors the discharge through the phase distribution map of the partial discharge defect. By combining optical detection and electrical detection, the present invention improves the sensitivity and accuracy of partial discharge defect detection, reduces the problem of the optical detection being affected by external light, and at the same time reduces the influence of electromagnetic interference and environmental noise on the detection result in electrical detection, thereby solving the problem of low accuracy in detecting partial discharge defects of insulated electrical equipment in the prior art. This combined detection method not only enhances the reliability of detection, but also realizes more accurate fault monitoring and diagnosis, which helps to ensure the safe operation of the power system.

[0054] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0055] Unless otherwise specifically stated, the relative arrangement of components and steps, numerical expressions, and values set forth in these embodiments do not limit the scope of the present invention. At the same time, it should be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn in actual proportional relationships. Technologies, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, such technologies, methods, and devices should be regarded as part of the authorization specification. In all the examples shown and discussed here, any specific values should be construed as merely exemplary and not as limitations. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that like reference numerals and letters denote like items in the following figures, and thus, once an item is defined in one figure, it does not need to be further discussed in subsequent figures.

[0056] In the description of the present invention, it should be understood that the orientation or positional relationships indicated by orientation terms such as "front, rear, upper, lower, left, right", "lateral, vertical, perpendicular, horizontal", and "top, bottom", etc., are generally based on the orientation or positional relationships shown in the drawings. These are only for the convenience of describing the present invention and simplifying the description. Without contrary statements, these orientation terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the protection scope of the present invention; the orientation terms "inner, outer" refer to the inside and outside relative to the contour of each component itself.

[0057] For ease of description, spatial relative terms such as "above...", "over...", "on the upper surface of...", "above-mentioned", etc., can be used here to describe the spatial positional relationship between a device or feature shown in the figure and other devices or features. It should be understood that the spatial relative terms are intended to encompass different orientations in use or operation in addition to the orientation described in the figure for the device. For example, if the device in the figure is inverted, the device described as "above other devices or structures" or "over other devices or structures" will then be positioned "below other devices or structures" or "under other devices or structures". Thus, the exemplary term "above..." can include both the orientations of "above..." and "below...". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and corresponding interpretations should be made for the spatial relative descriptions used here.

[0058] In addition, it should be noted that the use of terms such as "first", "second", etc. to limit components is only for the convenience of differentiating the corresponding components. Without otherwise stating, these terms have no special meanings. Therefore, they should not be construed as limiting the protection scope of the present invention.

[0059] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A partial discharge detection device for an insulating electrical equipment, characterized in that, Comprising: A device main body (10) having a simulation cavity (11) for accommodating an electrode component to be measured (1) and filling an insulating medium. At least part of a discharge component (20) is disposed in the device main body (10) and located in the simulation cavity (11) for simulating the discharge of the electrode component to be measured (1). An optical detection component (30) connected to the device main body (10), and at least part of the optical detection component (30) communicates with the inside of the simulation cavity (11) for acquiring an optical signal generated during the discharge process in the simulation cavity (11) and converting it into an electrical signal. An electrical detection component (40) connected to the discharge component (20) for acquiring a plurality of electrical signals generated during the discharge process in the simulation cavity (11). A signal display (50) connected to the optical detection component (30) and the electrical detection component (40) respectively for analyzing the plurality of electrical signals acquired by the optical detection component (30) and the electrical detection component (40) to obtain the partial discharge defect state of the electrode component to be measured (1).

2. The partial discharge detection device for an insulated electrical equipment according to claim 1, characterized in that, The discharge component (20) includes: A high-voltage discharge part (21) and a low-voltage discharge part (22) which are oppositely arranged in the simulation cavity (11). The electrode component to be measured (1) is disposed between the high-voltage discharge part (21) and the low-voltage discharge part (22). One end of the high-voltage discharge part (21) is connected to a high-voltage terminal (24) through a guide rod (23), and the high-voltage terminal (24) is connected to a power transmission component (60) for outputting high-voltage electricity to the high-voltage discharge part (21). One end of the low-voltage discharge part (22) extending out of the simulation cavity (11) is connected to a low-voltage terminal (25) for grounding.

3. The partial discharge detection device for an insulated electrical equipment according to claim 1, characterized in that, An installation port (12) communicating with the simulation cavity (11) is provided on the device main body (10). The optical detection component (30) includes: A fixing plate (31) having a plurality of connection holes (310) provided along its circumferential direction for installing the fixing plate (31) at the installation port (12) on the device main body (10) through the plurality of connection holes (310). A through hole (311) is provided on the fixing plate (31). A connecting pipe (32) having one end connected to the through hole (311), and the other end of the connecting pipe (32) is provided with a convex lens (33). A signal connecting member is provided in the connecting pipe (32), and at least part of the signal connecting member extends into the simulation cavity (11).

4. The partial discharge detection device for an insulated electrical equipment according to claim 3, characterized in that, The optical detection component (30) further includes: A photomultiplier tube (34) connected to the signal connecting member in the connecting pipe (32) and the signal display (50) respectively through connection lines for collecting optical pulses generated during the discharge process in the simulation cavity (11), enhancing the optical signal, and converting the optical signal into an electrical signal for transmission to the signal display (50).

5. The partial discharge detection device for an insulated electrical equipment according to claim 1, characterized in that, An insulating member (13) is provided inside the device main body (10), and the insulating member (13) and a part of the inner wall of the device main body (10) enclose the simulation cavity (11). The electrical detection component (40) includes: A very high frequency sensor (41) is disposed on the device main body (10) and connected to the insulating member (13). The very high frequency sensor (41) is connected to the signal display (50) through a connecting wire, and is used to monitor the electromagnetic waves generated during the discharge process in the simulation cavity (11) and transmit them to the signal display (50).

6. The partial discharge detection device for an insulated electrical equipment according to claim 2, wherein, The electrical detection component (40) includes: A high voltage probe (42). One end of the high voltage probe (42) is connected to the high voltage terminal (24), the housing of the high voltage probe (42) is grounded, and the other end of the high voltage probe (42) is connected to the signal display (50) through a connecting wire, and is used to synchronously obtain a sine reference signal and transmit it to the signal display (50) when the power transmission component (60) outputs high voltage electricity to the high voltage terminal (24).

7. The partial discharge detection device for an insulated electrical equipment according to claim 2, characterized in that, The power transmission component (60) includes: A transformer (61); A capacitor (62) is connected to the transformer (61) through a resistor (63). One end of the capacitor (62) is connected to the high voltage terminal (24) through a connecting wire, and is used to output high voltage electricity to the high voltage terminal (24).

8. The partial discharge detection device for an insulated electrical equipment according to claim 7, characterized in that, The electrical detection component (40) includes: A current detection component (43). The first end of the current detection component (43) is connected to the capacitor (62), the second end of the current detection component (43) is grounded, and the third section of the current detection component (43) is connected to the signal display (50) through a connecting wire, and is used to obtain the pulse current signal when the power transmission component (60) outputs high voltage electricity to the high voltage terminal (24) and transmit it to the signal display (50).

9. The partial discharge detection device for an insulated electrical equipment according to claim 1, wherein, The partial discharge detection device for insulated electrical equipment further includes: An air extraction component, which is communicated with the simulation cavity (11) and is used to evacuate the simulation cavity (11); and / or, A ventilation component, which is communicated with the simulation cavity (11) and is used to fill the insulating medium into the simulation cavity (11).

10. A method for detecting partial discharge of an insulating switch, applicable to the partial discharge detection device of the insulating electrical equipment described in any one of claims 1 to 9, characterized in that, The detection method includes: After filling the insulating medium into the simulation cavity, controlling the test electrode component in the simulation cavity to discharge; Controlling the optical detection component to obtain the optical signal generated during the discharge process in the simulation cavity and convert it into an electrical signal; Controlling the electrical detection component to obtain a plurality of electrical signals generated during the discharge process in the simulation cavity; Analyzing the plurality of electrical signals collected by the optical detection component and the electrical detection component through the signal display to obtain the partial discharge limit distribution state of different test electrode components.

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