GIS partial discharge detection cover plate of integrated sensor and installation method and system

Abstract

The invention discloses a GIS partial discharge detection cover plate of an integrated sensor and a mounting method and system, and belongs to the technical field of power equipment state monitoring, the GIS partial discharge detection cover plate comprises a cover plate main body and a mounting seat, the cover plate main body is provided with a mounting hole, and the cylindrical mounting seat corresponds to the mounting hole and is filled with an insulating material; a sensor module, a wireless transmission module and an edge computing unit are embedded and integrated in the insulating material; a connecting plate is arranged at the end part of the mounting seat. According to the device, the problem that partial discharge signals are difficult to capture due to the fact that built-in sensors of old GIS equipment are insufficient and the layout spacing is too long is solved, and the acquisition capacity of weak and accidental partial discharge signals is improved; the defect that an external sensor is susceptible to electromagnetic interference is overcome, and the signal-to-noise ratio and the accuracy of partial discharge detection signals are improved; non-intrusive accurate positioning of partial discharge of the GIS equipment is realized, and the high-efficiency detection requirement in a power-off maintenance window period is met; disassembly and sealing damage to the GIS equipment in the detection process are avoided, and the operation reliability of the equipment is guaranteed.

Description

Technical Field

[0001] This invention belongs to the field of power equipment condition monitoring technology, and particularly relates to a cover plate for GIS partial discharge detection with integrated sensors, as well as its installation method and system. Background Technology

[0002] Gas-insulated switchgear (GIS) is a core piece of equipment in power systems, boasting advantages such as compact structure, small footprint, and high reliability. It is widely used in substations for 750 kV and above high-voltage transmission lines. However, due to its fully enclosed structure, partial discharge (PD) faults within GIS equipment are difficult to detect directly, posing a significant challenge to fault location and troubleshooting.

[0003] Currently, partial discharge detection in GIS equipment mainly relies on two existing technical solutions. The first is the built-in UHF sensor detection solution: a built-in UHF sensor is pre-installed during the GIS tank production stage, detecting partial discharge by capturing the 300MHz-3GHz high-frequency electromagnetic waves generated. This solution is used in some new equipment, but for older GIS equipment produced and put into operation around 2013 (such as the ZF27-800(L) 750kV combined electrical appliance produced by Henan Pinggao Co., Ltd.), there are problems with insufficient number of built-in UHF sensors and excessively long sensor spacing, resulting in severe attenuation of the partial discharge signal during propagation, and nearby sensors being unable to effectively capture weak signals. The second solution is the external UHF sensor detection solution: an UHF sensor is installed outside the GIS equipment without modifying the equipment structure. However, the sensors in this solution are directly exposed to the substation environment, making them susceptible to external electromagnetic interference. The signal-to-noise ratio of the detected signal is low, making it difficult to accurately distinguish between partial discharge signals and interference signals. Furthermore, for the highly enclosed GIS tank, the signal penetration capability is limited, making it difficult to capture deep discharge signals inside the equipment.

[0004] Furthermore, when GIS equipment exhibits sporadic or intermittent partial discharge signals (such as a floating discharge signal with an amplitude stable at around -22dBm and occurring twice within one cycle), traditional detection methods also face the problem of insufficient positioning accuracy. For example, in the partial discharge detection of phase C of the 7541 circuit breaker on the 750kV Dawu Line 2 of Dabancheng Substation, high-precision positioning instruments such as the Grubb PD71S and Shanghai Moke EC3000 were used. Traditional methods such as acoustic-electric combined positioning and UHF time difference positioning failed to achieve accurate positioning due to factors such as unreasonable sensor layout, signal attenuation, and external interference.

[0005] In summary, existing technologies have the following drawbacks: In older GIS equipment, the deployment of built-in UHF sensors is insufficient and the spacing is too long, resulting in severe partial discharge signal attenuation and poor weak signal capture capabilities, failing to meet the requirements for intermittent partial discharge detection. External UHF sensors are susceptible to external electromagnetic interference, have low signal-to-noise ratios, poor detection accuracy, and limited signal penetration into enclosed tanks. Traditional detection methods cannot achieve non-invasive, precise positioning, requiring complex positioning algorithms and high-precision instruments, making operation difficult and the detection cycle long, making it difficult to match the time requirements of power outage maintenance windows. Furthermore, existing detection methods require disassembling the equipment or damaging its seals, posing safety risks such as dust, moisture, and damage to secondary terminals, affecting the reliability of GIS equipment operation. Summary of the Invention

[0006] The technical problem to be solved by this invention is to overcome the shortcomings of the existing technology and provide a cover plate for GIS partial discharge detection with integrated sensors. The main solution is to technically modify the original current transformer cover plate of GIS equipment and develop a special cover plate with integrated sensor modules. This enables efficient acquisition and accurate positioning of partial discharge signals from GIS equipment, solving the problem of insufficient built-in UHF sensors and excessive spacing between them in older GIS equipment, which makes it difficult to capture partial discharge signals. It also improves the acquisition capability of weak and intermittent partial discharge signals; overcomes the defect of external UHF sensors being susceptible to electromagnetic interference, and improves the signal-to-noise ratio and accuracy of partial discharge detection signals; achieves non-invasive and accurate positioning of partial discharge in GIS equipment, shortens the detection cycle, meets the high-efficiency detection needs during power outage maintenance windows; and avoids disassembly and damage to the sealing of GIS equipment during the detection process, reducing operational safety risks and ensuring the reliability of equipment operation.

[0007] The solution adopted by this invention to solve its technical problem is as follows:

[0008] A cover plate for partial discharge detection in GIS with integrated sensors, comprising:

[0009] The main body of the cover plate is made of metal based on the size and installation interface of the original CT cover plate of the GIS equipment, forming a continuous electromagnetic shielding layer. While maintaining mechanical compatibility with the original equipment, it achieves shielding against low-frequency interference.

[0010] The cover plate body has a through mounting hole at its center, and the area of ​​the mounting hole is 30%-50% of the total area of ​​the cover plate body.

[0011] The cover plate body has a cylindrical mounting base corresponding to the mounting hole on its side, which is fixed to the outside of the cover plate body and is filled with insulating material.

[0012] The insulating material integrates a sensor module, a wireless transmission module, and an edge computing unit.

[0013] The sensor module's signal output terminal is connected to a T-type connector. The sensor module integrates a self-test circuit for monitoring sensor sensitivity, insulation status, and communication link status. The wireless transmission module supports 5G or LoRa communication protocols. The edge computing unit is used for signal preprocessing, feature extraction, and data compression.

[0014] The mounting base is provided with a connecting plate at its end;

[0015] The cover plate body has an installation groove on its inner edge, and a sealing gasket is provided in the installation groove.

[0016] As a preferred embodiment of the present invention

[0017] The insulating material is epoxy resin insulating material or polytetrafluoroethylene insulating material, and its dielectric constant ranges from 3.2 to 3.6.

[0018] As a preferred embodiment of the present invention

[0019] The sensor module includes an ultra-high frequency sensor.

[0020] As a preferred embodiment of the present invention

[0021] The sensor module includes a combination of an ultra-high frequency sensor and an ultrasonic sensor.

[0022] As a preferred embodiment of the present invention

[0023] The mounting hole is a circular hole or an annular hole.

[0024] As a preferred embodiment of the present invention

[0025] A corrugated metal sealing ring is provided between the mounting base and the cover plate body.

[0026] As a preferred embodiment of the present invention

[0027] The side of the connecting plate is provided with a protective sleeve corresponding to the T-type connector. The protective sleeve includes a tube body and a threaded housing.

[0028] A GIS partial discharge detection system with integrated sensors, comprising:

[0029] One or more cover plate bodies are distributed in the original CT cover plate position;

[0030] The data aggregation node is used to receive data collected by the sensor modules in each cover plate body;

[0031] The cloud platform is used for multi-source data fusion and location calculation.

[0032] A method for installing a cover plate for partial discharge detection in GIS with integrated sensors includes the following steps:

[0033] Step S1: Customize a matching dedicated cover body according to the original CT cover plate specifications of the GIS equipment;

[0034] Step S2: Remove the original CT cover plate, install the cover plate body of the present invention, and perform sealing treatment;

[0035] Step S3: Start sensor acquisition and connect it to the partial discharge monitor via a T-connector;

[0036] Step S4: If installed on both sides, use the time difference positioning method to calculate the discharge point;

[0037] Step S5: If installed on one side, use a combination of ultra-high frequency and ultrasonic signals for positioning.

[0038] As a preferred embodiment of the present invention

[0039] The time difference positioning method in step S4 includes the following steps:

[0040] Step S41: Install two cover plate bodies at the CT positions on both sides of the same phase of the GIS equipment;

[0041] Step S41: Record the time difference between the signals received by the sensor modules in the two cover plates. ;

[0042] Step S41: Based on the signal propagation speed Spacing with sensor Establish a system of equations:

[0043] ;

[0044] in, The distance from the discharge point to one side of the sensor module. Given the distance from the discharge point to the sensor module on the other side, the distances X and Y from the discharge point to each sensor are calculated.

[0045] The joint analysis and localization in step S5 includes comparing and verifying the time-frequency characteristics of UHF signals and ultrasonic signals to distinguish between real partial discharge and interference signals.

[0046] Compared with the prior art, the present invention has the following beneficial effects:

[0047] 1. Non-invasive design, safe and reliable:

[0048] By directly modifying and integrating the functions of the original CT cover plate, non-invasive sensor installation is achieved. No alteration to the GIS main structure or damage to the equipment's seal is required; detection can be performed simply by replacing the CT cover plate. This avoids risks such as damage to the equipment's seal and secondary terminals, perfectly adapting to older equipment and resolving the contradiction between insufficient built-in sensors and the difficulty of installing external sensors. Furthermore, the dual-seal design (sealing gasket + metal corrugated sealing ring) ensures dust and moisture resistance reliability during long-term operation, avoiding secondary safety risks introduced during detection.

[0049] 2. Significantly improved signal acquisition capability:

[0050] The cover plate is installed at the CT position of the GIS equipment, close to critical areas such as internal conductive components and closing resistors. Through the combination design of the metal shielded cover plate, circular / annular mounting holes, and epoxy resin / PTFE insulation material, it effectively blocks external electromagnetic interference, improves the signal-to-noise ratio by more than 40%, ensures the accuracy of partial discharge signals, avoids misjudgment of interference signals, and can effectively capture weak and occasional partial discharge signals, solving the signal acquisition problem caused by insufficient sensors in old equipment.

[0051] 3. High accuracy of multi-mode sensing and intelligent positioning:

[0052] It supports two modes: UHF single-sensor time-difference positioning and UHF-ultrasonic dual-sensor joint analysis. It can adapt to dual-side or single-side installation scenarios. Combined with the accurate calculation of signal propagation speed inside the GIS tank, the positioning error can be controlled within ±0.15 meters. Combined with edge computing and cloud platform analysis, it can achieve meter-level accurate positioning of the discharge point and fault type identification, significantly improving detection reliability and diagnostic efficiency.

[0053] 4. Enhanced wireless and intelligent capabilities:

[0054] It integrates 5G / LoRa wireless transmission, edge computing unit and sensor self-test circuit, realizes wireless data backhaul, on-site preprocessing and status self-sensing, supports multi-device collaborative networking and remote monitoring, reduces on-site wiring and improves system deployment flexibility and intelligence level.

[0055] 5. Efficient and convenient deployment:

[0056] The cover plate is designed based on the original CT cover plate specifications, which is fully compatible with the original equipment. It has strong adaptability and simple installation process. The installation process only requires replacing the cover plate and completing the sealing. It can be quickly deployed during power outage maintenance windows. With a long-term monitoring capability of more than 50 hours, it meets the high-efficiency detection needs during power outage maintenance windows and significantly shortens the detection cycle.

[0057] 6. Cost-effective and easy to promote:

[0058] This solution features low retrofit costs and simple construction. It is compatible with various brands of partial discharge locators, such as Grubb, Mok, and Huacheng, and is suitable for various scenarios such as inspection, fault diagnosis, and status monitoring. It provides an efficient, reliable, and scalable complete solution for the partial discharge management of old GIS equipment, and has significant engineering application value and promotion prospects. Attached Figure Description

[0059] Figure 1 This is a schematic diagram of the structure of a cover plate for GIS partial discharge detection with an integrated sensor proposed in this invention;

[0060] Figure 2 This is a schematic diagram of the main body of the cover plate in the GIS partial discharge detection cover plate with integrated sensor proposed in this invention;

[0061] Figure 3 This is a partial schematic diagram of a cover plate for GIS partial discharge detection with integrated sensor proposed in this invention;

[0062] Figure 4 This is a schematic diagram of the connecting seat in a cover plate for partial discharge detection of GIS with an integrated sensor proposed in this invention;

[0063] Figure 5 This is a cross-sectional schematic diagram of the main body of the cover plate in the GIS partial discharge detection cover plate with integrated sensor proposed in this invention;

[0064] Figure 6 This is a front view of the main body of a cover plate for GIS partial discharge detection with integrated sensors proposed in this invention;

[0065] Figure 7 This is a flowchart of an installation method for a cover plate for GIS partial discharge detection with integrated sensors, as proposed in this invention.

[0066] Figure 8 This is a schematic block diagram of a GIS partial discharge detection system with integrated sensors proposed in this invention.

[0067] Explanation of reference numerals in the attached figures:

[0068] 1. Cover plate body,

[0069] 1-1. Mounting holes

[0070] 1-2, Mounting slot,

[0071] 1-3, Connecting holes

[0072] 2. Mounting base,

[0073] 2-1, Sensor Module

[0074] 2-2, T-type connector,

[0075] 2-3. Connecting plate

[0076] 2-4. Protective cover

[0077] 2-5. Connect the ear.

[0078] 2-6. Threaded rod. Detailed Implementation

[0079] The specific embodiments of the present invention are described below with reference to the accompanying drawings and examples:

[0080] It should be noted that the structures, colors, proportions, sizes, etc. shown in the accompanying drawings are only used to complement the content disclosed in the specification, so that those skilled in the art can understand and read them, and are not intended to limit the conditions under which the present invention can be implemented. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and objectives that the present invention can produce, should still fall within the scope of the technical content disclosed in the present invention.

[0081] At the same time, in the description of the present invention, it should be understood that the terms "one end", "the other end", "middle", "upper", "side", "top", "inner", "front", "center", "both ends", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and 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, and therefore should not be construed as a limitation of the present invention.

[0082] Furthermore, the terms "first," "second," "third," and "fourth" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first," "second," "third," or "fourth" may explicitly or implicitly include at least one of those features.

[0083] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "setting," "connection," "fixing," "screw connection," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components or the interaction between two components. Unless otherwise explicitly limited, those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0084] like Figures 1-6As shown, this invention provides a cover plate for GIS partial discharge detection with integrated sensors. By technically modifying the original current transformer (CT) cover plate of GIS equipment, a dedicated cover plate integrating a sensor module is developed, enabling efficient acquisition and precise positioning of partial discharge signals from GIS equipment. Specifically, it includes a cover plate body. Based on the dimensions and installation interface of the original CT cover plate of the GIS equipment, the cover plate body is designed with metal shielding to ensure compatibility with the original equipment without requiring modifications to the original installation structure. Simultaneously, the cover plate body uses the same material and thickness as the original CT cover plate to ensure the overall mechanical strength and sealing performance of the cover plate.

[0085] The cover plate body has a mounting hole and a mounting base at its center, with the mounting base corresponding to the mounting hole. The mounting base is fixed to the side of the cover plate body away from the inside of the GIS equipment via connecting lugs, threaded rods, and connecting holes. The mounting hole penetrates the cover plate body, and its area accounts for 30%-50% of the total area of ​​the cover plate body. This proportion range provides sufficient wave-transmitting area to ensure effective penetration and reduce attenuation of the UHF signal from the sensor module, while retaining sufficient metal structure to maintain the mechanical strength and electromagnetic shielding performance of the cover plate body, and meeting the volume requirements of the mounting base. This avoids a decrease in the rigidity of the cover plate body or shielding failure due to excessive perforation, and does not affect the overall sealing and installation adaptability of the cover plate. In addition, it ensures that the volume of the mounting base corresponding to the mounting hole is sufficient to accommodate the embedded sensor module, ensuring that the sensor module's detection surface is fully exposed inside the GIS equipment.

[0086] The mounting base adopts a cylindrical hollow structure. The mounting holes and the inner cavity of the mounting base are filled with insulating material to accommodate the sensor module, wireless transmission module and edge computing unit. During the manufacturing process, the insulating material is first poured, and then the sensor module, wireless transmission module and edge computing unit are embedded and installed inside the insulating material.

[0087] The wireless transmission module uses 5G or LoRa technology to achieve wireless data transmission, reducing on-site cable layout and further improving operational convenience. It is suitable for large-area, multi-device simultaneous detection scenarios. The sensor module integrates a self-testing circuit, which can periodically detect the sensor's sensitivity, insulation status, and communication link, enabling sensor status self-awareness and fault early warning. The edge computing unit is used to process acquired signals, extract features, and compress data in real time, reducing transmission load and improving system response speed and intelligence level.

[0088] A connecting plate is provided on the side of the mounting base away from the main body of the cover plate. The connecting plate is fixed to the end of the mounting base by applying glue for sealing. The detection surface of the sensor module faces the inside of the GIS equipment. The signal output end of the sensor module passes through the connecting plate and connects to the T-type connector. Multiple devices can be connected at the same time through the T-type connector, so that it can be connected to partial discharge locators of different brands.

[0089] The cover plate body has an installation groove and connection hole near the edge on the side facing the inside of the GIS equipment. The cover plate body is fixed to the GIS equipment through the connection hole and the bolts inside. A sealing gasket is placed in the installation groove to ensure the airtightness of the cover plate body after installation and prevent dust and moisture from entering the inside of the GIS equipment.

[0090] In another embodiment of the present invention, a protective sleeve corresponding to the T-joint is provided on the side of the connecting plate to improve the environmental adaptability of on-site operations. Specifically, the protective sleeve consists of a tube fixed to the side of the connecting plate and a shell threadedly connected thereto.

[0091] In another embodiment of the present invention, the mounting hole is selected as a circular hole or an annular hole, and the corresponding sensor module is selected as a circular sensor. Neither a circle nor an annular hole has sharp corners, thus preventing electromagnetic scattering and standing wave effects at the corners. This ensures more uniform signal penetration and attenuation in all directions, effectively preventing signal distortion. Simultaneously, the circular or annular hole provides a more uniform stress distribution during machining, avoiding structural fatigue caused by stress concentration at the corners, thereby improving the fatigue resistance and long-term operational reliability of the cover plate. Furthermore, the smooth electromagnetic boundary helps reduce signal reflection, further improving the transmission efficiency of the sensor signal.

[0092] In another embodiment of the present invention, the sensor module may include an ultra-high frequency sensor. When the GIS equipment has CT installation positions on both sides, the device of the present invention can be installed at the CT installation positions on both sides of the same phase. Based on the dual-sensor time difference positioning principle, by recording the time difference between the partial discharge signals received by the two sensor modules and solving the equations based on the known straight-line distance between the two sensor modules, the precise location of the discharge point can be calculated, thereby achieving non-invasive precise positioning.

[0093] In another embodiment of the present invention, the sensor module may also include a combination of a UHF sensor and an ultrasonic sensor. When the GIS equipment has only one CT mounting position on one side, both the UHF sensor and the ultrasonic sensor can be embedded in the mounting base simultaneously. By fusing the joint detection and cross-verification analysis of UHF electromagnetic signals and ultrasonic acoustic signals, it is possible to effectively distinguish between real partial discharge signals and external interference in complex electromagnetic environments, improving the reliability of signal recognition in single detection mode. This is particularly suitable for partial discharge detection and preliminary localization in situations where sensor placement is limited or there is strong interference.

[0094] In another embodiment of the present invention, the above-mentioned insulating material may be epoxy resin insulating material or polytetrafluoroethylene insulating material.

[0095] Epoxy resin insulation materials have the characteristics of high insulation, low dielectric loss and high mechanical strength after curing. They can ensure low attenuation penetration of ultra-high frequency signals, while effectively shielding low frequency electromagnetic interference, thus realizing the integrated function of "high frequency penetration and low frequency shielding" and adapting to the complex operating environment of GIS equipment.

[0096] Polytetrafluoroethylene (PTFE) insulation material has superior insulation properties, extremely low dielectric loss, and stable insulation characteristics over a wide temperature range. It can ensure ultra-low attenuation penetration of ultra-high frequency signals, while effectively blocking low-frequency electromagnetic interference. It can also achieve the integrated function of "high-frequency penetration and low-frequency shielding" and is suitable for the harsh operating environment of GIS equipment.

[0097] As another embodiment of the present invention, a metal corrugated sealing ring is provided at the joint between the cover plate body and the mounting base to achieve dual protection of mechanical sealing and elastic sealing, further improving the dustproof and moisture-proof reliability of the device of the present invention during long-term operation.

[0098] like Figure 7 As shown, a method for installing a cover plate for partial discharge detection in GIS with integrated sensors includes the following steps:

[0099] Step S1, Preliminary Preparation: Customize a matching special cover plate according to the CT cover plate specifications of the target GIS equipment to ensure that the cover plate is fully compatible with the installation interface of the GIS equipment CT; conduct a low-voltage electric shock risk assessment of the work area; when removing the original cover plate, the operators should wear low-voltage electrician gloves to prevent contact with the CT secondary terminals; formulate pre-control measures for dust prevention, secondary terminal protection, and post-installation sealing; and prepare a special construction plan.

[0100] Step S2, Cover Replacement: Remove the original CT cover of the GIS equipment and clean the impurities on the installation contact surface; align the main body of the special cover with the installation interface and tighten it with the original fixing bolts to ensure a firm installation; apply sealant to the gaps in the contact surface to complete the sealing treatment.

[0101] Step S3, Signal Acquisition: Connect the signal output terminal of the UHF sensor to the partial discharge monitor (such as the Mok ICU monitor, GRUB PD71X locator, etc.) via a T-connector, and turn on the device to acquire signals. Based on the fact that the longest time interval between intermittent signals detected by the built-in UHF sensor is 50 hours, the sensor is designed for long-term monitoring experiments to continuously monitor for more than 50 hours to ensure the capture of intermittent partial discharge signals.

[0102] Step S4, Positioning Calculation:

[0103] 1. When both sides of the GIS equipment have CT installation positions: Based on the dual-sensor time-difference positioning principle, the device of this invention is installed at the CT installation positions on both sides of the same phase of the GIS equipment (such as the CT positions on the I bus side and II bus side of phase C of the circuit breaker), and the time difference between the two sensor modules receiving the partial discharge signal is recorded. Based on the propagation speed of partial discharge signals inside the GIS tank. (approximately 3 x 10) 8 (m / s), combined with the straight-line distance between the two sensor modules Establish a system of two linear equations in two variables:

[0104] ;

[0105] in, For the discharge point to Distance of the mother-side sensor module, For the discharge point to The distance to the mother-side sensor module; the precise location of the discharge point is calculated by solving a system of equations;

[0106] 2. When the GIS equipment has a CT mounting position on only one side: Simultaneously embed an ultra-high frequency (UHF) sensor and an ultrasonic sensor (partial discharge will generate ultrasonic signals). Through mutual verification of the "UHF + ultrasonic" dual-mode signals, the false alarm rate of a single signal is reduced. This is particularly suitable for partial discharge detection in complex electromagnetic environments and applicable to GIS equipment with special structures.

[0107] For example: A 220 kV substation's GIS equipment only has a CT installation location on one side. The implementation steps are as follows:

[0108] Cover plate customization and installation: A custom cover plate body integrating UHF + ultrasonic dual sensors is installed at the A-phase CT position of the circuit breaker to complete the sealing treatment.

[0109] Signal acquisition: Connect the Shanghai Moke EC3000 partial discharge monitor, start long-term monitoring, and intermittent partial discharge signal was captured in the 32nd hour.

[0110] Joint analysis: Extracting UHF and ultrasonic signals, comparing and verifying time and frequency characteristics, eliminating external electromagnetic interference, confirming the signal as a real partial discharge, and initially locating the discharge point to provide precise direction for maintenance.

[0111] like Figure 8 As shown, a GIS partial discharge detection system with integrated sensors includes:

[0112] One or more non-invasive cover plates are deployed at the corresponding positions of the original CT cover plates in the GIS equipment. The sensor modules in each cover plate can be configured as either a UHF single-sensor mode or a UHF-ultrasound dual-sensor mode according to the on-site detection requirements, enabling on-site signal preprocessing and adaptive acquisition. The cover plate body has a built-in wireless transmission module that supports 5G / LoRa adaptive networking, enabling wireless transmission of acquired data.

[0113] The data aggregation node is used to receive data collected by the sensor modules in each cover plate body and complete local caching and protocol unification;

[0114] The cloud platform is used for multi-source data fusion and positioning calculation, and outputs the positioning results through a visual interface.

[0115] Preferably, the cloud platform can also be configured with discharge mode recognition and trend prediction functions, and generate diagnostic reports and early warning information.

[0116] The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

[0117] Many other changes and modifications can be made without departing from the concept and scope of this invention. It should be understood that this invention is not limited to the specific embodiments, and the scope of this invention is defined by the appended claims.

Claims

1. A cover plate for GIS partial discharge detection with integrated sensors. Its features are, Include: The cover plate body is made of metal based on the size and installation interface of the original CT cover plate of the GIS equipment, forming a continuous electromagnetic shielding layer. While maintaining mechanical compatibility with the original equipment, it achieves shielding against low-frequency interference. The cover plate body has a through mounting hole at its center, and the area of ​​the mounting hole is 30%-50% of the total area of ​​the cover plate body. The cover plate body has a cylindrical mounting base corresponding to the mounting hole on its side, which is fixed to the outside of the cover plate body and is filled with insulating material. The insulating material integrates a sensor module, a wireless transmission module, and an edge computing unit. The sensor module's signal output terminal is connected to a T-type connector. The sensor module integrates a self-test circuit for monitoring sensor sensitivity, insulation status, and communication link status. The wireless transmission module supports 5G or LoRa communication protocols. The edge computing unit is used for signal preprocessing, feature extraction, and data compression. The mounting base is provided with a connecting plate at its end; The cover plate body has an installation groove on its inner edge, and a sealing gasket is provided in the installation groove.

2. A cover plate for GIS partial discharge detection with integrated sensors as described in claim 1. Its features are, The insulating material is epoxy resin insulating material or polytetrafluoroethylene insulating material, and its dielectric constant ranges from 3.2 to 3.

6.

3. A cover plate for GIS partial discharge detection with integrated sensors as described in claim 1. Its features are, The sensor module includes an ultra-high frequency sensor.

4. A cover plate for GIS partial discharge detection with integrated sensors as described in claim 1. Its features are, The sensor module includes a combination of an ultra-high frequency sensor and an ultrasonic sensor.

5. A cover plate for GIS partial discharge detection with integrated sensors as described in claim 1. Its features are, The mounting hole is a circular hole or an annular hole.

6. A cover plate for GIS partial discharge detection with integrated sensor as described in claim 1. Its features are, A corrugated metal sealing ring is provided between the mounting base and the cover plate body.

7. A cover plate for GIS partial discharge detection with integrated sensor as described in claim 1. Its features are, The side of the connecting plate is provided with a protective sleeve corresponding to the T-type connector. The protective sleeve includes a tube body and a threaded housing.

8. A GIS partial discharge detection system with integrated sensors, employing the GIS partial discharge detection cover plate with integrated sensors as described in claim 1. Its features are, include: One or more cover plate bodies are distributed in the original CT cover plate position; The data aggregation node is used to receive data collected by the sensor modules in each cover plate body; The cloud platform is used for multi-source data fusion and location calculation.

9. A method for installing a cover plate for GIS partial discharge detection with integrated sensors, comprising the cover plate for GIS partial discharge detection with integrated sensors as described in claim 1. Its features are, Includes the following steps: Step S1: Customize a matching dedicated cover body according to the original CT cover plate specifications of the GIS equipment; Step S2: Remove the original CT cover plate, install the cover plate body of the present invention, and perform sealing treatment; Step S3: Start sensor acquisition and connect it to the partial discharge monitor via a T-connector; Step S4: If installed on both sides, use the time difference positioning method to calculate the discharge point; Step S5: If installed on one side, use a combination of ultra-high frequency and ultrasonic signals for positioning.

10. The method for installing a cover plate for GIS partial discharge detection with an integrated sensor as described in claim 9. Its features are, The time difference positioning method in step S4 includes the following steps: Step S41: Install two cover plate bodies at the CT positions on both sides of the same phase of the GIS equipment; Step S42: Record the time difference between the signals received by the sensor modules in the two cover plates. ; Step S43: Based on the signal propagation speed Spacing with sensor Establish a system of equations: ； in, The distance from the discharge point to one side of the sensor module. Given the distance from the discharge point to the sensor module on the other side, the distances X and Y from the discharge point to each sensor are calculated. The joint analysis and localization in step S5 includes comparing and verifying the time-frequency characteristics of UHF signals and ultrasonic signals to distinguish between real partial discharge and interference signals.

Images