Partial discharge detection device and method for insulated electrical equipment

Abstract

The present invention provides a device and method for detecting partial discharge in insulated electrical equipment. The detection device comprises: a device body having a simulation cavity for accommodating an electrode to be tested and filled with an insulating medium; a discharge assembly disposed within the device body, at least partially within the simulation cavity, for simulating discharge in the electrode to be tested; an optical detection assembly connected to the device body and in communication with the simulation cavity, for acquiring optical signals generated in the simulation cavity during discharge and converting them into electrical signals; an electrical detection assembly connected to the discharge assembly, for acquiring multiple electrical signals generated in the simulation cavity during discharge; and a signal display connected to each of the optical and electrical detection assemblies for analyzing the multiple electrical signals acquired by the optical and electrical detection assemblies to determine the partial discharge defect status of the electrode to be tested. The present invention solves the problem of low accuracy in detecting partial discharge defects in insulated electrical equipment in the prior art.

Description

Technical Field

[0001] The present invention relates to the technical field of partial discharge defect detection of insulating electrical equipment, and in particular to a device and method for detecting partial discharge of insulating electrical equipment. Background Art

[0002] With the upgrade and expansion of power systems, ensuring the reliability and safety of electrical equipment has become a critical issue in the power industry. In high-voltage, extra-high-voltage, and even ultra-high-voltage transmission and distribution networks, clean-air insulated switchgear (CAIS) has been widely used due to its environmental and economic advantages. However, the long-term operation of these devices in harsh environments can lead to degradation of the insulation performance, particularly the occurrence of partial discharge (PD) defects, which pose a significant threat to the stability and safety of power systems. Therefore, accurate and rapid detection and diagnosis of PD defects are crucial to maintaining the healthy operation of power systems.

[0003] Existing methods for detecting partial discharge defects involve multiple fields, including optics, electricity, and chemistry. Optical detection technology is widely used in partial discharge identification due to its non-contact, online monitoring capabilities, and strong resistance to electromagnetic interference. Electrical detection technology relies on capturing changes in current and voltage waveforms, offering the advantage of high sensitivity. However, its direct contact detection method is susceptible to electromagnetic interference and environmental noise, leading to errors in detection results.

[0004] However, existing technologies present the following challenges: Optical detection significantly decreases in sensitivity under strong light conditions, making it difficult to capture weak discharge light signals. This limitation is particularly pronounced outdoors or in high-light-intensity indoor environments. Furthermore, while electrical detection is highly sensitive, it requires a physical connection to electrical equipment and is therefore susceptible to electromagnetic interference and environmental noise. This poses a particularly severe challenge to detection accuracy, particularly under high voltage and complex electromagnetic environments. Summary of the Invention

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

[0006] In order to achieve the above-mentioned purpose, according to one aspect of the present invention, there is provided a partial discharge detection device for insulating electrical equipment, comprising: a device body, having a simulation cavity for accommodating an electrode member to be tested and filled with an insulating medium, a discharge component at least partially located in the simulation cavity within the device body, for simulating the discharge of the electrode member to be tested; an optical detection component, connected to the device body and at least partially connected to the simulation cavity, for acquiring an optical signal generated in the simulation cavity during the discharge process and converting it into an electrical signal; an electrical detection component, connected to the discharge component, for acquiring multiple electrical signals generated in the simulation cavity during the discharge process; and a signal display, respectively connected to the optical detection component and the electrical detection component, for analyzing the multiple electrical signals acquired by the optical detection component and the electrical detection component to obtain the partial discharge defect state of the electrode member to be tested.

[0007] Furthermore, the discharge assembly includes: a high-voltage discharge part and a low-voltage discharge part, which are arranged relatively in the simulation cavity, and the electrode part to be tested is arranged between the high-voltage discharge part and the low-voltage discharge part. One end of the high-voltage discharge part is connected to a high-voltage terminal through a guide rod, and the high-voltage terminal is connected to the 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 to a low-voltage terminal, and the low-voltage terminal is used for grounding.

[0008] Furthermore, a mounting port communicating with the simulation cavity is provided on the device body, and the optical detection assembly includes: a fixing plate, which is provided with a plurality of connecting holes along its circumferential direction, so that the fixing plate can be installed at the mounting port on the device body through the plurality of connecting holes; a through hole is provided on the fixing plate; a connecting tube, one end of the connecting tube is connected to the through hole, and the other end of the connecting tube is provided with a convex lens, and a signal connector is provided in the connecting tube, and at least a portion of the signal connector extends into the simulation cavity.

[0009] Furthermore, the optical detection component also includes: a photomultiplier tube, which is connected to the signal connector and the signal display in the connecting tube through connecting wires, so as to collect the light pulses generated in the simulation cavity during the discharge process and enhance the light signal, and convert the light signal into an electrical signal and transmit it to the signal display.

[0010] Furthermore, an insulating part is provided in the device body, and the insulating part and part of the inner wall of the device body form a simulation cavity. The electrical detection component includes: a ultra-high frequency sensor, which is arranged on the device body and connected to the insulating part. The ultra-high frequency sensor is connected to the signal display through a connecting line to monitor the electromagnetic waves generated in the simulation cavity during the discharge process and transmit them to the signal display.

[0011] Furthermore, the electrical detection component includes: a high-voltage probe, one end of the high-voltage probe is connected to the high-voltage terminal, the shell of the high-voltage probe is used for grounding, and the other end of the high-voltage probe is connected to the signal display through a connecting line, so as to synchronously obtain a sinusoidal reference signal and transmit it to the signal display when the power transmission component outputs high voltage electricity to the high-voltage terminal.

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

[0013] Furthermore, the electrical detection component includes: a current detection element, a first end of the current detection element is connected to the capacitor, a second end of the current detection element is used for grounding, and a third end of the current detection element is connected to the signal display through a connecting line, so as to obtain a pulse current signal when the power transmission component outputs high voltage to the high voltage terminal and transmit it to the signal display.

[0014] Furthermore, the partial discharge detection device for insulated electrical equipment also includes: an exhaust component connected to the simulation cavity for vacuuming the simulation cavity; and / or a ventilation component connected to the simulation cavity for filling the simulation cavity with an insulating medium.

[0015] According to another aspect of the present invention, a method for detecting partial discharge of an insulating switch is provided, which is applicable to the partial discharge detection device for insulating electrical equipment mentioned above. The detection method includes: after filling an insulating medium into a simulation cavity, controlling the electrode member to be tested in the simulation cavity to discharge; controlling the optical detection component to obtain the light signal generated in the simulation cavity during the discharge process and converting it into an electrical signal; controlling the electrical detection component to obtain multiple electrical signals generated in the simulation cavity during the discharge process; and analyzing the multiple electrical signals collected by the optical detection component and the electrical detection component through a signal display to obtain the local discharge limit distribution status of different electrode members to be tested.

[0016] By applying the technical solution of the present invention, a partial discharge detection device for insulating electrical equipment is provided, comprising a device body, an optical detection component, an electrical detection component and a signal display; the device body has a simulation cavity for accommodating an electrode member to be tested and filled with an insulating medium, and a discharge component at least partially located in the simulation cavity is provided in the device body for simulating the discharge of the electrode member to be tested; the optical detection component is connected to the device body and at least part of the optical detection component is connected to the simulation cavity for acquiring an optical signal generated in the simulation cavity during the discharge process and converting it into an electrical signal; the electrical detection component is connected to the discharge component for acquiring multiple electrical signals generated in the simulation cavity during the discharge process; the signal display is respectively connected to the optical detection component and the electrical detection component for analyzing the multiple electrical signals acquired by the optical detection component and the electrical detection component to obtain the partial discharge defect state of the electrode member to be tested.

[0017] Using the technical solution of the present invention, an optical detection component collects light pulses radiated during a simulated intracavity discharge process and converts them into electrical signals. An electrical detection component acquires pulse currents, ultra-high frequency signals, and sinusoidal reference signals from local discharge defects during the simulated intracavity discharge process. A signal analyzer then synchronously collects the optical and electrical signals generated by the local discharge defect, identifying and monitoring the discharge using a local discharge defect phase distribution map. By combining optical and electrical detection, the present invention improves the sensitivity and accuracy of local discharge defect detection, reduces the effects of external light on optical detection, and reduces the impact of electromagnetic interference and environmental noise on detection results during electrical detection. This addresses the low accuracy of local discharge defect detection in insulating electrical equipment in the prior art. This combined detection method not only enhances detection reliability but also enables more accurate fault monitoring and diagnosis, helping to ensure the safe operation of power systems. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings, which constitute part of this application, are intended to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are intended to explain the present invention and do not constitute an undue limitation of the present invention. In the accompanying drawings:

[0019] Figure 1 It shows a schematic diagram of the overall structure of an embodiment of a partial discharge detection device for insulated electrical equipment according to the present invention;

[0020] Figure 2 It shows a schematic structural diagram of an optical detection assembly provided by an embodiment of a partial discharge detection device for insulated electrical equipment according to the present invention;

[0021] Figure 3 It shows a partial discharge phase distribution diagram of a spike discharge provided by an embodiment of a partial discharge detection device for insulated electrical equipment according to the present invention;

[0022] Figure 4 It shows a partial discharge phase distribution diagram of creeping discharge provided by an embodiment of the partial discharge detection device for insulated electrical equipment according to the present invention;

[0023] Figure 5 A partial discharge phase distribution diagram of suspended discharge provided by an embodiment of the partial discharge detection device for insulated electrical equipment according to the present invention is shown.

[0024] The above drawings include the following reference numerals:

[0025] 1. Electrode to be tested; 10. Device body; 11. Simulation cavity; 12. Mounting port; 13. Insulator; 20. Discharge assembly; 21. High-voltage discharge part; 22. Low-voltage discharge part; 23. Guide rod; 24. High-voltage terminal; 25. Low-voltage terminal; 30. Optical detection assembly; 31. Fixing plate; 310. Connection hole; 311. Through hole; 32. Connecting tube; 33. Convex lens; 34. Photomultiplier tube; 40. Electrical detection assembly; 41. UHF sensor; 42. High-voltage probe; 43. Current detection component; 50. Signal display; 60. Power transmission assembly; 61. Transformer; 62. Capacitor; 63. Resistor. DETAILED DESCRIPTION

[0026] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present invention will be described in detail below with reference to the accompanying 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 device and method for detecting partial discharge of 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 insulated electrical equipment, including a device body 10, an optical detection component 30, an electrical detection component 40 and a signal display 50; the device body 10 has a simulation cavity 11 for accommodating an electrode member 1 to be tested and filled with an insulating medium, and a discharge component 20 is provided in the device body 10, which is at least partially located in the simulation cavity 11, for simulating the discharge of the electrode member 1 to be tested; the optical detection component 30 is connected to the device body 10 and at least part of the optical detection component 30 is connected to the simulation cavity 11, for obtaining the optical signal generated in the simulation cavity 11 during the discharge process and converting it into an electrical signal; the electrical detection component 40 is connected to the discharge component 20, for obtaining multiple electrical signals generated in the simulation cavity 11 during the discharge process; the signal display 50 is connected to the optical detection component 30 and the electrical detection component 40 respectively, for analyzing the multiple 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 member 1 to be tested.

[0029] In one aspect of the technical solution of this embodiment, an optical detection component 30 collects light pulses radiated during the discharge process within the simulated cavity 11 and converts them into electrical signals. An electrical detection component 40 acquires pulse current, ultra-high frequency signals, and a sinusoidal reference signal from the local discharge defect during the discharge process within the simulated cavity 11. A signal analyzer then synchronously collects the optical and electrical signals generated by the local discharge defect, identifying and monitoring the discharge using the local discharge defect phase distribution map. By combining optical and electrical detection, the present invention improves the sensitivity and accuracy of local discharge defect detection, reduces the impact of external light on optical detection, and reduces the impact of electromagnetic interference and environmental noise on the detection results during electrical detection. This addresses the low accuracy of local discharge defect detection in insulating electrical equipment in the prior art. This combined detection method not only enhances detection reliability but also enables more accurate fault monitoring and diagnosis, helping to ensure the safe operation of the power system.

[0030] In this embodiment, the electrode member 1 to be tested is a needle plate electrode, a surface discharge electrode, a floating potential electrode, etc., which is used to simulate the detection of local discharge defects such as spikes, surface discharge, and floating potential in clean air insulated switchgear.

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

[0032] In this embodiment, the discharge assembly 20 includes a high-voltage discharge section 21 and a low-voltage discharge section 22. The high-voltage discharge section 21 and the low-voltage discharge section 22 are arranged relative to each other within the simulation chamber 11. The electrode member 1 to be tested is arranged between the high-voltage discharge section 21 and the low-voltage discharge section 22. One end of the high-voltage discharge section 21 is connected to a high-voltage terminal 24 via a guide rod 23. The high-voltage terminal 24 is connected to the power transmission assembly 60 for outputting high voltage electricity to the high-voltage discharge section 21. The end of the low-voltage discharge section 22 extending from the simulation chamber 11 is connected to a low-voltage terminal 25 for grounding. The high-voltage terminal 24 is connected to the power transmission assembly 60, allowing it to be connected to a voltage of 0 to 100 kV. An insulator made of silicone rubber is provided between the high-voltage terminal 24 and the device body 10.

[0033] Through the above-mentioned arrangement, the high-voltage discharge section 21 and the low-voltage discharge section 22 are arranged relative to each other, which can simulate the electric field distribution and voltage gradient during actual operation of the electrical equipment. In particular, when the electrode 1 to be tested is placed between the two, an environment similar to the occurrence of local discharge in a real device can be formed, thereby ensuring the accuracy and reliability of the test results. The connection design between the high-voltage terminal 24 and the power transmission component 60 enables the device to accurately control and adjust the voltage output to the high-voltage discharge section 21. It can provide flexible test conditions according to the detection requirements or simulate local discharge conditions of different voltage levels, thereby enhancing the adaptability and test range of the device. The grounding design of the low-voltage discharge section 22 effectively shields external electromagnetic interference, ensures the purity of the signal during the simulated discharge process, avoids the influence of environmental noise on the test results, and improves the accuracy of signal detection.

[0034] like Figure 1 and Figure 2 As shown, the device body 10 is provided with a mounting port 12 connected to the simulation cavity 11, and the optical detection assembly 30 includes a fixing plate 31 and a connecting tube 32; the fixing plate 31 is provided with a plurality of connecting holes 310 along its circumferential direction, so that the fixing plate 31 can be installed at the mounting port 12 on the device body 10 through the plurality of connecting holes 310; the fixing plate 31 is provided with a through hole 311; one end of the connecting tube 32 is connected to the through hole 311, and the other end of the connecting tube 32 is provided with a convex lens 33, and a signal connector is provided in the connecting tube 32, and at least a portion of the signal connector extends into the simulation cavity 11. In the above configuration, the fixing plate 31 is made of 3mm stainless steel, the signal connector is an SMA interface, and the convex lens 33, connecting tube 32 and SMA interface are all made of fused quartz material, which can transmit the emission spectrum of 200nm to 2000nm. In this way, the multiple connection holes 310 on the fixing plate 31 cooperate with the mounting 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 tube 32 can focus the light signals generated in the simulation cavity 11, especially the weak light pulses generated by local discharge. The convex lens 33 concentrates these light signals and enhances their intensity, facilitating the subsequent efficient detection of the photomultiplier tube 34, thereby improving the sensitivity and accuracy of optical detection. The signal connector in the connecting tube 32 at least partially extends into the simulation cavity 11, and can directly and stably capture the light signal and transmit it to the photomultiplier tube 34. This design reduces the loss and interference during the transmission of the optical signal, ensuring the reliability of the signal transmission from the simulation cavity 11 to the signal display 50.

[0035] Specifically, the optical detection assembly 30 also includes a photomultiplier tube 34, which is connected to the signal connector in the connecting tube 32 and the signal display 50 via connecting wires. The photomultiplier tube 34 is used to collect light pulses generated during the discharge process in the simulation cavity 11, amplify the light signal, and convert the light signal into an electrical signal for transmission 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 light signal to the photomultiplier tube 34.

[0036] Through the above-mentioned configuration, the photomultiplier tube 34 has extremely high light detection sensitivity and is capable of capturing the weak light pulse signals generated during the local discharge process in the simulation cavity 11. Even in low-light environments, the photomultiplier tube 34 can significantly improve the device's ability to detect local discharges, ensuring the accurate capture of tiny discharge events. Furthermore, the photomultiplier tube 34 is not only capable of detecting light signals, but also significantly amplifying the detected light signals. This step is crucial for detecting weak local discharge light pulses because it converts the light signals into analyzable electrical signals, facilitating subsequent processing and display. This feature ensures that even the weakest light 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 electromagnetic fields. Therefore, it performs well in local discharge detection in high-voltage and complex electromagnetic environments, and can provide pure, interference-free signals, which is extremely critical in the field of power equipment detection and ensures the accuracy and consistency of the detection results.

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

[0038] like Figure 1As shown, an insulating member 13 is provided within the device body 10. The insulating member 13 and part of the inner wall of the device body 10 enclose a simulated cavity 11. The electrical detection component 40 includes a UHF sensor 41. The UHF sensor 41 is disposed on the device body 10 and connected to the insulating member 13. The UHF sensor 41 is connected to a signal display 50 via a connecting line to monitor the electromagnetic waves generated during the discharge process in the simulated cavity 11 and transmit them to the signal display 50. The insulating member 13 is made of silicone rubber. The UHF sensor 41 is placed on the insulating member 13 and wrapped with a metal shielding tape. In this way, the UHF sensor 41 can capture the electromagnetic waves generated during the discharge process in the simulated cavity 11. Signals in this frequency band are generally closely related to partial discharge activity. The UHF sensor 41 has high sensitivity and can detect weak electromagnetic fluctuations, which is crucial for the early detection and location of partial discharge defects. At the same time, since the UHF sensor 41 is directly mounted on the device body 10 and tightly connected to the insulating part 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 simulation cavity 11 to the signal display 50.

[0039] Specifically, the electrical detection assembly 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 via a connecting cable. This probe is used to synchronously acquire a sinusoidal reference signal when the power transmission assembly 60 outputs high voltage electricity to the high-voltage terminal 24 and transmit it to the signal display 50. This configuration enables the high-voltage probe 42 to capture the synchronous reference signal of the high-voltage electricity output by the power transmission assembly 60 to the high-voltage terminal 24. This signal is typically in the form of a sine wave. This provides a time reference for the signal display 50, allowing the electrical signal generated by partial discharge to be compared with the sinusoidal reference signal, helping to determine the phase position of the partial discharge, which is crucial for analyzing the relationship between discharge and voltage peaks. Furthermore, the high-voltage probe 42 is directly connected to the signal display 50 via a connecting cable, enabling real-time transmission of the acquired high-voltage electrical signal, including the synchronous sinusoidal reference signal. This facilitates the signal display 50 to immediately analyze the signal and provide timely partial discharge detection results.

[0040] In this embodiment, the power transmission component 60 includes a transformer 61, a resistor 63 and a capacitor 62, which is connected to the transformer 61 through the resistor 63. One end of the capacitor 62 is connected to the high-voltage terminal 24 through a connecting line for outputting high voltage electricity to the high-voltage terminal 24. In this way, the low-voltage power supply can be converted into high-voltage electricity through the boosting effect of the transformer 61, thereby providing the required high-voltage power to 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. The capacitor 62 acts as an energy storage element, accumulating electrical energy during the charging process and then quickly releasing it during discharge. This spike electrical pulse can simulate the electric field effect of local discharge in the electrode member 1 to be tested, providing a test environment close to the actual local discharge situation.

[0041] Specifically, the electrical detection component 40 includes a current detection element 43, the first end of the current detection element 43 is connected to the capacitor 62, the second end of the current detection element 43 is used for grounding, and the third end of the current detection element 43 is connected to the signal display 50 via a connecting line, so as 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. Through the above-mentioned setting, the current detection element 43 can directly monitor the pulse current signal generated when the capacitor 62 discharges to the high-voltage terminal 24, and can capture the peak state of the current in real time, providing direct evidence of partial discharge. And the direct connection with the signal display 50 via the connecting line ensures that the detected pulse current signal can be quickly and losslessly transmitted to the signal display 50, which is convenient for immediate analysis and processing, and helps to achieve real-time monitoring and rapid response of partial discharge.

[0042] In this embodiment, the current detection element 43 is an impedance pulse current detection device, which uses a parallel measurement circuit, and one end of the input impedance is connected to the coupling capacitor 62.

[0043] In the present application, the device for detecting partial discharges of insulated electrical equipment further includes an exhaust component, which is in communication with the simulation chamber 11 and is used to evacuate the simulation chamber 11. With the above arrangement, evacuation can create an environment close to vacuum or low pressure, which helps to reduce the impact 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 differ from the insulating medium environment of actual high-voltage electrical equipment. Vacuuming can more accurately simulate the operating conditions of high-voltage electrical equipment and improve the accuracy and reliability of detection.

[0044] In the present application, the partial discharge detection device for insulated electrical equipment also includes a ventilation component, which is connected to the simulation cavity 11 and is used to fill the simulation cavity 11 with an insulating medium. In this way, after the simulation cavity 11 is vacuumed 2 to 3 times, clean air is filled into the simulation cavity 11 through the ventilation component to simulate the operating environment of the real electrical equipment during the detection process, thereby ensuring the accuracy and reliability of the test results and providing a more practical data basis for subsequent equipment maintenance and fault prediction. In addition, different insulating media have different effects on the suppression effect and characteristics of partial discharge. The ventilation component can be filled with different types of insulating media, which helps to study the influence of the medium on partial discharge, including discharge mode, discharge frequency and discharge intensity, 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 vacuuming the simulation cavity 11 , the inner wall of the simulation cavity 11 is wiped 2 to 3 times with a dust-free cloth dipped in anhydrous ethanol, and the simulation cavity 11 is sealed after drying.

[0046] According to another aspect of the present invention, a method for detecting partial discharge of an insulating switch is provided, which is applicable to the above-mentioned partial discharge detection device for insulating electrical equipment. The detection method includes: after filling the simulation cavity 11 with an insulating medium, controlling the electrode member 1 to be tested in the simulation cavity 11 to discharge; controlling the optical detection component 30 to obtain the optical signal generated in the simulation cavity 11 during the discharge process and converting it into an electrical signal; controlling the electrical detection component 40 to obtain multiple electrical signals generated in the simulation cavity 11 during the discharge process; and 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 electrode members 1 to be tested. In this way, the method combines optical detection and electrical detection technology, and can simultaneously collect optical signals and electrical signals generated during the discharge process. This comprehensive detection method provides multi-dimensional information, can more comprehensively reflect the characteristics of partial discharge, improves the accuracy and reliability of 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 is as follows: the optical detection process involves an external spectral response enhancement module collecting light pulses emitted during the discharge process, feeding them into a photomultiplier tube (PMT) 34 for conversion into electrical signals; the electrical detection process involves an impedance-type pulse current detection device acquiring the pulse current in the partial discharge defect, an ultra-high frequency (UHF) sensor 41 monitoring the UHF signal generated by the partial discharge defect, and a high-voltage probe 42 synchronously acquiring a sinusoidal reference signal. An oscilloscope simultaneously collects the optical and electrical signals generated by the partial discharge defect, and the discharge is identified and monitored using the partial discharge defect phase distribution spectrum.

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

[0049] During the spike discharge, the ultra-high frequency, optical pulse, and pulse current signals first appear near 270°, where dizziness is more likely to occur. As the applied voltage increases further, the signals begin to appear near 90° in the positive half cycle.

[0050] During the surface discharge process, ultra-high frequency, light pulse and pulse current signals appear near 90° and 270° of the applied pressure, which have certain signal characteristics of corona discharge.

[0051] During the suspended potential discharge process, ultra-high frequency (UHF), light pulses, and pulsed current signals all appear on the rising and falling edges of the positive and negative half-cycles of applied pressure. Compared to spike and surface discharges, suspended discharges have the fewest signal pulses.

[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 body 10, an optical detection component 30, an electrical detection component 40 and a signal display 50; the device body 10 has a simulation cavity 11 for accommodating an electrode member 1 to be tested and filled with an insulating medium, and a discharge component 20 is provided in the device body 10, at least part of which is located in the simulation cavity 11, for simulating the discharge of the electrode member 1 to be tested; the optical detection component 30 is connected to the device body 10 and at least part of the optical detection component 30 is connected to the simulation cavity 11, for obtaining the optical signal generated in the simulation cavity 11 during the discharge process and converting it into an electrical signal; the electrical detection component 40 is connected to the discharge component 20, for obtaining multiple electrical signals generated in the simulation cavity 11 during the discharge process; the signal display 50 is respectively connected to the optical detection component 30 and the electrical detection component 40, for analyzing the multiple 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 member 1 to be tested. Using the technical solution of the present invention, the optical detection component 30 collects light pulses radiated during the discharge process within the simulated cavity 11 and converts them into electrical signals. The electrical detection component 40 acquires the pulse current, ultra-high frequency signal, and sinusoidal reference signal from the local discharge defect during the discharge process within the simulated cavity 11. A signal analyzer then synchronously collects the optical and electrical signals generated by the local discharge defect, and uses the local discharge defect phase distribution spectrum to identify and monitor the discharge. By combining optical and electrical detection, the present invention improves the sensitivity and accuracy of local discharge defect detection, reduces the impact of external light on optical detection, and reduces the impact of electromagnetic interference and environmental noise on the detection results during electrical detection. This addresses the low accuracy of local discharge defect detection in insulating electrical equipment in the prior art. This combined detection method not only enhances detection reliability but also enables more accurate fault monitoring and diagnosis, helping 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 the parts and steps, the numerical expressions and the numerical 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 sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship. The techniques, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the techniques, methods and equipment should be considered as part of the authorization specification. In all examples shown and discussed here, any specific values ​​should be interpreted as being merely exemplary and not as limiting. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following figures, and therefore, 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 directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "horizontal, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention; the directional words "inside and outside" refer to the inside and outside relative to the outline of each component itself.

[0057] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used herein to describe the spatial positional relationship of a device or feature to other devices or features as shown in the figures. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figures. For example, if the device in the drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0058] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0059] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. A partial discharge detection device for insulated electrical equipment, characterized in that: include: The device body (10) has a simulation cavity (11) for accommodating the electrode member (1) to be tested and filled with an insulating medium, and a discharge component (20) at least partially located in the simulation cavity (11) is provided in the device body (10) for simulating the discharge of the electrode member (1) to be tested; an optical detection component (30) connected to the device body (10) and at least a portion of the optical detection component (30) communicating with the interior of the simulation cavity (11), for acquiring an optical signal generated during a discharge process in the simulation cavity (11) and converting the optical signal into an electrical signal; An electrical detection component (40) connected to the discharge component (20) for acquiring a plurality of electrical signals generated in the simulation cavity (11) during the discharge process; a signal display (50) connected to the optical detection component (30) and the electrical detection component (40), respectively, for analyzing a plurality of electrical signals acquired by the optical detection component (30) and the electrical detection component (40) to obtain a partial discharge defect state of the electrode member (1) to be tested; The discharge assembly (20) includes: a high-voltage discharge portion (21) and a low-voltage discharge portion (22), which are arranged relative to each other in the simulation cavity (11); the electrode member to be tested (1) is arranged between the high-voltage discharge portion (21) and the low-voltage discharge portion (22); one end of the high-voltage discharge portion (21) is connected to a high-voltage terminal (24) through a guide rod (23); the high-voltage terminal (24) is connected to the power transmission assembly (60) for outputting high voltage electricity to the high-voltage discharge portion (21); one end of the low-voltage discharge portion (22) extending out of the simulation cavity (11) is connected to a low-voltage terminal (25); the low-voltage terminal (25) is used for grounding; The electrical detection component (40) includes: a current detection component (43), a first end of the current detection component (43) is connected to the power transmission component (60), a second end of the current detection component (43) is grounded, and a third end of the current detection component (43) is connected to the signal display (50) via a connecting line, so as to obtain a pulse current signal when the power transmission component (60) outputs high voltage electricity to the high voltage terminal (24) and transmit the pulse current signal to the signal display (50).

2. The partial discharge detection device for insulated electrical equipment according to claim 1, characterized in that: The device body (10) is provided with a mounting port (12) communicating with the simulation cavity (11), and the optical detection component (30) comprises: A fixing plate (31), the fixing plate (31) being provided with a plurality of connection holes (310) along its circumferential direction, so that the fixing plate (31) can be installed at the installation opening (12) on the device body (10) through the plurality of connection holes (310); a through hole (311) is provided on the fixing plate (31); A connecting tube (32), one end of the connecting tube (32) is connected to the through hole (311), the other end of the connecting tube (32) is provided with a convex lens (33), a signal connector is provided in the connecting tube (32), and at least a portion of the signal connector extends into the simulation cavity (11).

3. The partial discharge detection device for insulated electrical equipment according to claim 2, characterized in that: The optical detection assembly (30) further includes: The photomultiplier tube (34) is connected to the signal connector in the connecting tube (32) and the signal display (50) via connecting wires, respectively, to collect light pulses generated in the discharge process in the simulation cavity (11), enhance light signals, and convert the light signals into electrical signals for transmission to the signal display (50).

4. The partial discharge detection device for insulated electrical equipment according to claim 1, characterized in that: An insulating member (13) is provided in the device body (10), and the insulating member (13) and a portion of the inner wall of the device body (10) enclose the simulation cavity (11). The electrical detection component (40) includes: A UHF sensor (41) is provided on the device body (10) and connected to the insulating member (13). The UHF sensor (41) is connected to the signal display (50) via a connecting line to monitor electromagnetic waves generated during the discharge process in the simulation cavity (11) and transmit the electromagnetic waves to the signal display (50).

5. The partial discharge detection device for insulated electrical equipment according to claim 1, characterized in that: The electrical detection component (40) comprises: A high-voltage probe (42), one end of the high-voltage probe (42) is connected to the high-voltage terminal (24), a housing of the high-voltage probe (42) is used for grounding, and the other end of the high-voltage probe (42) is connected to the signal display (50) via a connecting line, so as to synchronously obtain a sinusoidal 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).

6. The partial discharge detection device for insulated electrical equipment according to claim 1, characterized in that: The power transmission component (60) includes: transformer (61); The capacitor (62) is connected to the transformer (61) via a resistor (63), and one end of the capacitor (62) is connected to the high-voltage terminal (24) via a connecting wire, so as to output high voltage electricity to the high-voltage terminal (24).

7. The partial discharge detection device for insulated electrical equipment according to claim 1, characterized in that: The partial discharge detection device for insulating electrical equipment further comprises: an air extraction component, connected to the simulation cavity (11), for evacuating the simulation cavity (11); and / or, A ventilation component is in communication with the simulation cavity (11) and is used for filling the simulation cavity (11) with the insulating medium.

8. A method for detecting partial discharge of an insulating switch, applicable to the device for detecting partial discharge of insulating electrical equipment according to any one of claims 1 to 7, characterized in that: The detection method comprises: After filling the simulation cavity with an insulating medium, controlling the electrode to be tested in the simulation cavity to discharge; Controlling the optical detection component to obtain the optical signal generated in the simulation cavity during the discharge process and converting it into an electrical signal; Controlling the electrical detection component to obtain a plurality of electrical signals generated in the simulation cavity during the discharge process; The multiple electrical signals collected by the optical detection component and the electrical detection component are analyzed by a signal display to obtain the local discharge limit distribution states of different electrode components to be tested.

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