A precise location device for flashover discharge fault points in GIS equipment

Abstract

A precise location device for flashover discharge fault points in GIS equipment, relating to the field of discharge monitoring, includes a drive mechanism, a base, and a lifting mechanism. A main chamber is fixedly installed on the telescopic end of the lifting mechanism. A cover plate is fixedly installed on the upper surface of the main chamber. A disc is rotatably installed on the lower surface of the cover plate. At least three guide members are distributed and installed on the lower surface of the disc. An L-shaped plate is slidably installed in each guide member. A detection module is set on the L-shaped plate. The detection module includes a feature acquisition module, a noise sensing module, and a high-frequency sensing module. This utility model solves the problems of low efficiency, cumbersome operation, and inconsistent positioning benchmarks caused by the need for manual sensor replacement in traditional detection by fully automatic, rapid, and precise switching of the three functional modules. It adopts a scientific diagnostic process to achieve centimeter-level or even millimeter-level final precise positioning. This progressive strategy greatly improves positioning efficiency and accuracy.

Description

Technical Field

[0001] This utility model relates to the field of discharge monitoring, and in particular to a device for accurately locating flashover discharge fault points in GIS equipment. Background Technology

[0002] In power systems, the stable operation of gas-insulated switchgear (GIS) and gas-insulated metal-enclosed circuits (GIL) is crucial. However, flashover discharges can occur internally due to installation defects, metal particles, insulator aging, and other reasons, seriously threatening power grid safety. Therefore, rapid and accurate location of flashover discharge faults is a core challenge in operation and maintenance. Traditional location detection is mostly done manually, which can cause injury to personnel if the partial discharge is strong. At the same time, the location is not very accurate, making it difficult to locate the fault point in a short time, which complicates fault diagnosis and results in long maintenance times. Utility Model Content

[0003] The purpose of this invention is to provide a precise location device for flashover discharge fault points in GIS equipment, enabling seamless, efficient, and high-precision operation from large-scale screening to precise location, thereby solving the problems mentioned in the background art.

[0004] The technical problem solved by this utility model is achieved through the following technical solution:

[0005] A precise location device for flashover discharge fault points in GIS equipment includes a drive mechanism, a base, and a lifting mechanism. A main chamber is fixedly installed on the telescopic end of the lifting mechanism. A cover plate is fixedly installed on the upper surface of the main chamber. A disc is rotatably installed on the lower surface of the cover plate. At least three guide members are distributed and installed on the lower surface of the disc. An L-shaped plate is slidably installed in each guide member. A detection module is provided on the L-shaped plate. The detection module includes a feature acquisition module, a noise sensing module, and a high-frequency sensing module, which are respectively installed on the corresponding L-shaped plates.

[0006] Preferably, a detection window is provided in the main compartment, and an ejector block is fixedly provided at the bottom of the inner cavity of the main compartment, with the protrusion on the side of the ejector block facing the detection window.

[0007] Preferably, a servo motor is fixedly installed on the upper surface of the cover plate, and the output end of the servo motor is fixedly connected to the disk portion.

[0008] Preferably, the guide is configured as a rectangular frame with one end open.

[0009] Preferably, an elastic reset member is connected between the L-shaped plate and the side wall of the guide groove cavity facing the center of the disc portion.

[0010] Preferably, the drive mechanism is a track drive.

[0011] The advantages and positive effects of this utility model are:

[0012] This invention solves the problems of low efficiency, cumbersome operation, and inconsistent positioning benchmarks caused by the need for manual sensor replacement in traditional detection methods by fully automatic, rapid, and precise switching between three functional modules: high-frequency sensing, noise sensing, and feature acquisition. It employs a scientific diagnostic process: first, a large-area rapid scan is performed using the high-frequency sensing module to initially pinpoint the fault area; then, the noise sensing module is switched to narrow down the area; finally, the feature acquisition module is activated for detailed analysis of vibration and sound, achieving precise positioning at the centimeter or even millimeter level. This progressive strategy greatly improves positioning efficiency and accuracy. The entire detection process, from initial scanning to precise positioning, is seamlessly integrated without manual intervention, significantly shortening fault finding time. Attached Figure Description

[0013] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0014] Figure 1 This is a schematic diagram of the main structure of a device for accurately locating flashover discharge fault points in GIS equipment according to the present invention.

[0015] Figure 2 This is a schematic diagram of the main structure of a device for accurately locating flashover discharge fault points in GIS equipment according to the present invention.

[0016] Figure 3 This is a schematic diagram of the internal structure of the main compartment 13 in a precise location device for flashover discharge fault points in GIS equipment according to the present invention.

[0017] Figure 4 This is a schematic diagram of the main compartment 13 in a precise location device for flashover discharge fault points in GIS equipment according to the present invention.

[0018] Figure 5 This is a schematic diagram of the bottom structure of the disc part 21 in a precise positioning device for flashover discharge fault points in GIS equipment according to the present invention.

[0019] Figure 6 This is a schematic diagram of the track drive structure of a precise positioning device for flashover discharge fault points in GIS equipment according to the present invention.

[0020] The labels in the attached drawings are described as follows: drive mechanism 10; base 11; lifting mechanism 12; main chamber 13; detection window 14; cover plate 15; servo motor 16; ejection block 17; L-shaped plate 18; detection module 19; 20; disc part 21; guide component 22. Detailed Implementation

[0021] The present invention will now be described in further detail with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention. These drawings are simplified schematic diagrams, which are only used to illustrate the basic structure of the present invention in an illustrative manner. Therefore, they only show the components related to the present invention.

[0022] To facilitate understanding of this utility model, a more comprehensive description of the utility model will be given below with reference to the accompanying drawings, which show several embodiments of the utility model. However, the utility model can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of the utility model will be more thorough and complete.

[0023] In this utility model, unless otherwise explicitly specified and limited, the terms "installation", "connection", "linking", "fixing", 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, a direct connection, or an indirect connection through an intermediate medium; they can refer to the internal communication of at least two elements or the interaction relationship of at least two elements, 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. The embodiments of this utility model are further described in detail below with reference to the accompanying drawings:

[0024] Please see Figure 1-6This utility model provides an embodiment of a device for accurately locating flashover discharge fault points in GIS equipment, comprising a drive mechanism 10, a base 11, and a lifting mechanism 12. The drive mechanism 10 can be either a universal wheel drive or a track drive, selected based on the condition of the ground surface to be detected. A main chamber 13 is fixedly installed on the telescopic end of the lifting mechanism 12. A cover plate 15 is fixedly installed on the upper surface of the main chamber 13. A disc portion 21 is rotatably installed on the lower surface of the cover plate 15. Three guide members 22 are distributed and installed on the lower surface of the disc portion 21. A servo motor 16 is fixedly installed on the upper surface of the cover plate 15. The output end of the servo motor 16 is fixedly connected to the disc portion 21. L-shaped plates 18 are slidably installed in each of the guide members 22. A detection module 19 is provided on each L-shaped plate 18. The detection module 19 includes a feature acquisition module, a noise sensing module, and a high-frequency sensing module, which are respectively installed on the corresponding L-shaped plates 18. One module corresponds to one direction of the L-shaped plate 18. First, the noise sensing module and the high-frequency sensing module collect monitoring data of the discharge signal in the area and send it to the terminal system to analyze the problem area where the fault occurred. The initially analyzed area is still relatively large, so the feature acquisition module is used to collect the vibration and sound characteristics of the problem area. The collected data is sent to the terminal system for analysis. Then, the point with the largest frequency amplitude can be displayed in the time-frequency amplitude coordinate system interface of the data. By calculating the time corresponding to the point with the largest frequency amplitude, the location of the fault point in the problem area is completed.

[0025] It should be noted that, in this embodiment, a detection window 14 is provided in the main chamber 13, and an ejector block 17 is fixedly provided at the bottom of the inner cavity of the main chamber 13. The protrusion on the side of the ejector block 17 faces the detection window 14. The guide member 22 is configured as a rectangular frame with one end open. An elastic reset member is connected between the L-shaped plate 18 and the side wall of the guide member 22 facing the center of the disc portion 21. When it is necessary to switch between the function of the feature acquisition module, the noise sensing module and the high-frequency sensing module, the terminal system drives the servo... The motor 16 rotates, causing the disc 21 to rotate 120° via the lifting mechanism, which in turn causes the guide 22 to rotate. This allows the L-shaped plate 18 to move along the outer edge of the ejector block 17. When the L-shaped plate 18 rotates to the position of the detection window 14, it is pushed up by the side protrusion of the ejector block 17 and slides outward, thus ejecting the module that needs to be used. This is very convenient and ensures that the module can be retracted into the compartment for protection when not in use and can be ejected stably when in use, effectively avoiding bumps and damage to the sensor when it is moving or idle.

[0026] In practice, in the GIS (Gas Insulated Switchgear) room of the 110kV substation in the factory, the monitoring system detected intermittent insulation abnormalities in phase B of GIS bay No. 3. However, conventional methods could not determine the specific location of the fault. This bay is 15 meters long and contains multiple pot-type insulators and joints, making manual inspection difficult.

[0027] Phase 1: Technicians move the device to the vicinity of GIS bay number 3. Based on the flat indoor floor, a omnidirectional wheel drive mechanism is selected. The lifting mechanism 12 is controlled via a terminal (such as a tablet) to raise the main chamber 13, bringing the detection window 14 on the chamber to approximately the same height as the GIS pipe shell. At this point, the terminal system activates the high-frequency sensing module by default. The servo motor 16 inside the device rotates the disc 21 to the predetermined position, so that the L-shaped plate 18 containing the high-frequency sensing module faces the detection window 14. Under the action of the protruding part of the ejector block 17, the L-shaped plate is ejected, bringing the high-frequency sensor close to or against the GIS shell. Technicians initiate the automatic scanning program, and the drive mechanism 10 moves the device slowly along the GIS pipe. The high-frequency sensing module continuously collects electromagnetic wave signals within the pipe, searching for partial discharge pulse characteristics. When the device moves to approximately 8.5 meters from the starting point, the terminal system alarms, indicating the presence of a strong high-frequency pulse cluster in the area, initially pinpointing the fault area to the 8-9 meter range.

[0028] Phase Two: Switching Modules and Narrowing the Scope

[0029] The terminal issues a switching command: To further narrow down the scope, the technician selects "noise analysis mode" on the terminal, and the servo motor starts: The terminal command drives the servo motor 16 to rotate precisely 120°. The motor drives the disc part 21 and the three guide members 22 fixed on it to rotate together. The L-shaped plate 18 of the high-frequency sensing module, which was originally pushed out, moves out of the range of action of the push-out block 17 as it rotates. Under the tension of its elastic reset member (such as a spring), the L-shaped plate slides inward, retracting the high-frequency sensor into the main compartment 13 for protection. At the same time, the L-shaped plate, which was originally in the retracted state and contained the noise sensing module, is transported to the position of the detection window 14 as it rotates. When the L-shaped plate rotates to the protrusion of the push-out block 17, the protrusion extends into the groove of the guide member 22, overcoming the tension of the elastic reset member, and pushes the L-shaped plate outward, exposing the noise sensing module outside the detection window and putting it into the working position.

[0030] The device performs a secondary fine scan in the 8-9 meter range. The noise sensing module (a high-sensitivity ultrasonic microphone array) then activates, capturing ultrasonic signals generated by flashover discharge within the GIS. Data shows that the acoustic signal is strongest in the 8.6-8.8 meter range, reducing the fault location from 1 meter to 0.2 meters.

[0031] Phase 3: Final Switchover, Precise Location

[0032] Technicians selected "feature acquisition mode" for final positioning. The module switching motion steps (second switch: from "noise" to "feature acquisition") were exactly the same as the first switch: servo motor 16 rotated 120° again. The L-shaped plate of the noise sensing module retracted during rotation, while the L-shaped plate containing the feature acquisition module (which integrates vibration and broadband acoustic sensors) was rotated to the detection window and pushed out.

[0033] The device moves in millimeter-level steps within an extremely small range of 8.6 meters to 8.8 meters. The feature acquisition module simultaneously collects vibration and sound signals and transmits the data to the terminal in real time. The terminal system constructs a time-frequency amplitude coordinate system and clearly displays a maximum point where the frequency amplitude is significantly higher than the background noise. By analyzing information such as the time difference corresponding to this peak point, the system ultimately calculates the precise location of the flashover fault to be 8.72 meters from the starting point.

[0034] Based on the location results, maintenance personnel marked the corresponding location on the GIS pipeline casing. During power outage maintenance, the casing was opened, and arc burn marks caused by metal particles were found on the surface of a basin-type insulator, which perfectly matched the location results.

[0035] In summary, this invention achieves fully automated, rapid, and precise switching between three functional modules: high-frequency sensing, noise sensing, and feature acquisition. This solves the problems of low efficiency, cumbersome operation, and inconsistent positioning benchmarks caused by manual sensor replacement in traditional detection methods. It employs a scientific diagnostic process: first, a large-area rapid scan is performed using the high-frequency sensing module to initially pinpoint the fault area; then, the noise sensing module is switched to narrow down the area; finally, the feature acquisition module is used for detailed analysis of vibration and sound, achieving precise positioning at the centimeter or even millimeter level. This progressive strategy greatly improves positioning efficiency and accuracy. The entire detection process, from initial scanning to precise positioning, is seamlessly integrated without manual intervention, significantly shortening fault finding time. Simultaneously, automated operation reduces human error, ensuring the consistency and reliability of data acquisition, and providing key technical support for rapid fault diagnosis and ensuring the safe and stable operation of power equipment.

[0036] It should be emphasized that the embodiments described in this utility model are illustrative rather than limiting. Therefore, this utility model is not limited to the embodiments described in the specific implementation. Any other implementation methods derived by those skilled in the art based on the technical solutions of this utility model are also within the scope of protection of this utility model.

Claims

1. A precise location device for flashover discharge fault points in GIS equipment, comprising a drive mechanism (10), a base (11), and a lifting mechanism (12), characterized in that: The main chamber (13) is fixedly installed on the telescopic end of the lifting mechanism (12). A cover plate (15) is fixedly installed on the upper end face of the main chamber (13). A disc part (21) is rotatably installed on the lower end face of the cover plate (15). At least three guide members (22) are distributed and installed on the lower end face of the disc part (21). An L-shaped plate (18) is slidably installed in each guide member (22). A detection module (19) is provided on the L-shaped plate (18). The detection module (19) includes a feature acquisition module, a noise sensing module and a high-frequency sensing module, which are respectively installed on the corresponding L-shaped plate (18).

2. The device for accurately locating flashover discharge fault points in GIS equipment according to claim 1, characterized in that: The main compartment (13) is provided with a detection window (14), and an ejector block (17) is fixedly provided at the bottom of the inner cavity of the main compartment (13), with the protrusion on the side of the ejector block (17) facing the detection window (14).

3. The device for accurately locating flashover discharge fault points in GIS equipment according to claim 2, characterized in that: A servo motor (16) is fixedly installed on the upper surface of the cover plate (15), and the output end of the servo motor (16) is fixedly connected to the disc part (21).

4. The precise location device for flashover discharge fault points in GIS equipment according to claim 3, characterized in that: The guide (22) is configured as a rectangular frame with one end open.

5. A precise location device for flashover discharge fault points in GIS equipment according to claim 4, characterized in that: An elastic reset member is connected between the L-shaped plate (18) and the side wall of the guide member (22) on the side facing the center of the disc portion (21).

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