High-voltage capacitor on-line monitoring device

Abstract

The utility model discloses a high-voltage capacitor on-line monitoring device, and relates to the technical field of power monitoring, the high-voltage capacitor on-line monitoring device comprises a high-voltage capacitor body and a capacitor on-line monitoring assembly, the upper end of the front side of the high-voltage capacitor body is connected with a resistance sensing head in an adhesion manner, and a discharge sensor is connected with a clamping groove in the tail end of the lower side of a high-voltage end binding post. A discharge sensing probe is arranged on the inner side of the discharge sensor, a vibration sensor is arranged on the right side of the partial discharge sensor, the vibration sensing probe is connected to the lower end of the right side of the high-voltage capacitor body in an adhesion mode, and a limiting frame and an installation frame are fixedly installed through external bolts. The limiting frame and the mounting frame are sleeved on the outer side of the high-voltage capacitor body and are fixed through friction between the limiting frame and the mounting frame, so that damage to the high-voltage capacitor body can be reduced, a sufficient fixing effect is achieved, and the thermosensitive resistance sensing head can sensitively sense temperature change during operation of the high-voltage capacitor body.

Description

Technical Field

[0001] This utility model relates to the field of power monitoring technology, and in particular to an online monitoring device for high-voltage capacitors. Background Technology

[0002] A high-voltage capacitor is a type of capacitor composed of outgoing porcelain bushings, capacitor banks, and a casing. It features low loss and light weight and is mainly used in industrial frequency AC power systems to improve the power factor and enhance grid quality. Its structure includes a cylindrical body, a top of the body, a flat or hemispherical end cap, sealing elements, and accessories. The casing is made of thin steel plate and is sealed and welded. The internal capacitor bank consists of several capacitors connected together. In transmission lines, it can be used to form series compensation stations to improve transmission capacity. In large substations, it can be used to form SVCs to improve power quality. It can also be used at the end of distribution lines to improve the power factor and as a filter.

[0003] A search revealed that the document with publication number "CN217061773U" mentions that "this utility model relates to a high-voltage capacitor, including a shell and a capacitor body located inside the shell. Heat-conducting sheets are provided on the inner sidewalls and bottom wall of the shell, and heat sinks are correspondingly provided on the outer sidewalls and bottom wall of the shell. A heat-conducting column is provided between the heat-conducting sheets and the heat sinks. An anode lead and a cathode lead are electrically connected to the top of the capacitor body. An insulating rubber layer is sleeved on the anode lead and the cathode lead. A sealing cap is provided on the top of the insulating rubber layer. Limiting protrusions are provided on both the insulating rubber layer and the sealing cap, and corresponding limiting grooves are provided inside the shell." In use, this utility model offers good sealing, strong installation stability, good heat dissipation, a simple structure, and a compact size. However, in the monitoring of high-voltage capacitors, the monitoring of circuit current is often used. This monitoring method does not provide significant monitoring of the high-voltage capacitor itself. Therefore, if problems that do not affect the specific operation of the high-voltage capacitor occur during operation, detection loopholes can easily appear, potentially leading to accidents.

[0004] To address these issues, we provide an online monitoring device for high-voltage capacitors. Utility Model Content

[0005] The purpose of this invention is to provide an online monitoring device for high-voltage capacitors, thereby solving the problems mentioned in the background art.

[0006] This application provides an online monitoring device for high-voltage capacitors, including a high-voltage capacitor body and an online monitoring assembly. High-voltage terminals are mounted on the upper side of the high-voltage capacitor body. The online monitoring assembly includes a limiting frame located at the rear of the high-voltage capacitor body, a mounting frame mounted on the front of the high-voltage capacitor body, and a device mounting groove welded to the front of the mounting frame. A temperature sensor is mounted inside the device mounting groove. A resistance sensing head is adhered to the upper front end of the high-voltage capacitor body. A partial discharge sensor is located to the right of the temperature sensor. A discharge sensor is slotted to the lower end of the high-voltage terminals, and a discharge sensing probe is located inside the discharge sensor. The surface of the discharge sensor is coated with an insulating ceramic coating. Fixing frames are screwed to both sides of the discharge sensor. A vibration sensor is located to the right of the partial discharge sensor, and a vibration sensing probe is adhered to the lower right end of the high-voltage capacitor body. An online monitor is screwed to the front of the mounting frame.

[0007] Preferably, the limiting frame and the mounting frame are connected by screws, the limiting frame and the mounting frame form a slot connection for the high voltage capacitor body, and the limiting frame and the mounting frame fit tightly against the high voltage capacitor body.

[0008] Preferably, the temperature sensor and the resistance sensing head are electrically connected, and the resistance sensing head is a thermistor sensing head.

[0009] Preferably, the discharge sensor is electrically connected to the discharge sensing probe and the partial discharge sensor, and the discharge sensor and the discharge sensing probe are ultra-high frequency discharge sensing structures.

[0010] Preferably, the insulating ceramic coating and the discharge sensor are bonded together, and the insulating ceramic coating and the discharge sensor are tightly adhered to each other.

[0011] Preferably, the fixing frame and the high-voltage capacitor body are bonded together, the fixing frame and the discharge sensor are connected by screws, and the fixing frame and the discharge sensor are symmetrically arranged on the left and right sides.

[0012] Preferably, the vibration sensor and the vibration sensing probe are electrically connected, and the vibration sensor is a piezoelectric vibration sensor.

[0013] As can be seen from the above technical solution, this application provides a high-voltage capacitor online monitoring device. In use, firstly, the high-voltage capacitor body is installed in the desired position. Then, the limiting bracket and mounting bracket are fitted onto the outside of the high-voltage capacitor body and connected and fixed using external bolts. After preparation, the temperature sensor, partial discharge sensor, and vibration sensor are inserted into the equipment mounting slot, and the online monitor is fixed to the outer wall of the equipment mounting slot using bolts. Subsequently, the temperature sensor, partial discharge sensor, and vibration sensor are connected to the online monitor signal. After preparation, glue is applied to the inner side of the resistance sensing head connected to the temperature sensor, and then it is attached... Apply glue to the surface of the high-voltage capacitor body, and attach the vibration sensing probe connected to the vibration sensor to the inner side of the high-voltage capacitor body. Then, attach the discharge sensor connected to the partial discharge sensor to the bottom of the high-voltage terminal. The two should fit tightly together, allowing the discharge sensing probe to adhere to the surface of the high-voltage terminal. An insulating ceramic coating separates the two. Apply glue to the bottom of the mounting bracket for further fixation. If maintenance is required later, remove the external fixing bolts to access the discharge sensor. This completes the usage process of a high-voltage capacitor online monitoring device.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] 1. The limiting bracket and mounting bracket are fixedly installed by external bolts. The limiting bracket and mounting bracket are sleeved on the outside of the high voltage capacitor body. The fixing is achieved by the friction between the limiting bracket and the mounting bracket. This can reduce damage to the high voltage capacitor body and has a sufficient fixing effect. The thermistor sensor can sensitively detect the temperature change of the high voltage capacitor body during operation. Its shell is made of high temperature resistant and insulating ceramic material to ensure close contact with the high voltage capacitor body without interference.

[0016] 2. The discharge sensor and discharge induction probe operate based on the ultra-high frequency principle. They detect whether there is local leakage or discharge within the insulating medium of the high-voltage terminal during operation. The insulating ceramic coating has excellent insulation properties, which can effectively prevent current leakage between the discharge sensor and the high-voltage terminal, avoid interference with the partial discharge signal detection of the discharge induction probe, and ensure the accuracy of the monitoring data. The mounting bracket can fix the discharge sensor with screws to ensure that it will not loosen during contact. The mounting bracket is fixed to the high-voltage capacitor body by adhesive to avoid damage to the high-voltage capacitor body. Furthermore, a piezoelectric vibration sensor is selected to capture the minute vibrations inside the high-voltage capacitor body caused by electrical stress, mechanical loosening, etc., and is suitable for installation in the key support parts of the high-voltage capacitor body shell.

[0017] In summary, this application allows for direct monitoring of the high-voltage capacitor itself, thus providing a more intuitive understanding of whether the high-voltage capacitor is experiencing operational problems. Attached Figure Description

[0018] To more clearly illustrate the technical solution of this application, the accompanying drawings used in the implementation examples will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained from these drawings without any creative effort.

[0019] Figure 1 This is a schematic diagram of the overall appearance structure proposed in this utility model;

[0020] Figure 2 This is a schematic diagram of the overall structure of the capacitor online monitoring component proposed in this utility model;

[0021] Figure 3 This is a schematic diagram of the side structure of the high-voltage capacitor body proposed in this utility model;

[0022] Figure 4 This is a schematic diagram of the overall structure of the discharge sensor proposed in this utility model.

[0023] In the diagram: 1. High-voltage capacitor body; 2. High-voltage terminal; 3. Capacitor online monitoring component; 301. Limiting frame; 302. Mounting frame; 303. Equipment mounting slot; 304. Temperature sensor; 305. Resistance sensor head; 306. Partial discharge sensor; 307. Discharge sensor; 308. Discharge sensing probe; 309. Insulating ceramic coating; 310. Fixing frame; 311. Vibration sensor; 312. Vibration sensing probe; 313. Online monitor. Detailed Implementation

[0024] To enable those skilled in the art to better understand the technical solutions in this application, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings.

[0025] See Figure 1-4A high-voltage capacitor online monitoring device includes a high-voltage capacitor body 1 and a capacitor online monitoring component 3. High-voltage terminal posts 2 are installed on the upper side of the high-voltage capacitor body 1. The capacitor online monitoring component 3 includes a limiting frame 301 located at the rear of the high-voltage capacitor body 1, a mounting frame 302 installed on the front of the high-voltage capacitor body 1, an equipment mounting groove 303 welded to the front of the mounting frame 302, a temperature sensor 304 installed inside the equipment mounting groove 303, and a resistance sensing head 305 bonded to the upper front end of the high-voltage capacitor body 1. The right side of the temperature sensor 304... A partial discharge sensor 306 is provided on the side. A discharge sensor 307 is connected to the lower end of the high-voltage terminal 2 via a slot. A discharge sensing probe 308 is provided inside the discharge sensor 307. An insulating ceramic coating 309 is applied to the surface of the discharge sensor 307. Fixing brackets 310 are screwed to both sides of the discharge sensor 307. A vibration sensor 311 is provided on the right side of the partial discharge sensor 306. A vibration sensing probe 312 is attached to the lower right side of the high-voltage capacitor body 1. An online monitor 313 is screwed to the front of the mounting bracket 302.

[0026] In this utility model, the limiting frame 301 and the mounting frame 302 are connected by screws. The limiting frame 301 and the mounting frame 302 form a slot connection with the high voltage capacitor body 1. The limiting frame 301 and the mounting frame 302 fit tightly against the high voltage capacitor body 1. When needed, the limiting frame 301 and the mounting frame 302 are fixedly installed by external bolts. The limiting frame 301 and the mounting frame 302 are sleeved on the outside of the high voltage capacitor body 1 and fixed by friction between the limiting frame 301 and the mounting frame 302. This can reduce damage to the high voltage capacitor body 1 and has a sufficient fixing effect.

[0027] In this invention, the temperature sensor 304 and the resistance sensor head 305 are electrically connected. The resistance sensor head 305 is a thermistor sensor head. When needed, the thermistor sensor head 305 can sensitively sense the temperature change of the high-voltage capacitor body 1 during operation. Its outer shell is made of high-temperature resistant and insulating ceramic material to ensure close contact with the high-voltage capacitor body 1 without interference.

[0028] In this invention, the discharge sensor 307 is electrically connected to the discharge sensing probe 308 and the partial discharge sensor 306. The discharge sensor 307 and the discharge sensing probe 308 are ultra-high frequency discharge sensing structures. When needed, the discharge sensor 307 and the discharge sensing probe 308 operate based on the ultra-high frequency principle, detecting whether there is local leakage or discharge phenomenon inside the insulating medium of the high-voltage terminal 2 during operation.

[0029] In this invention, the insulating ceramic coating 309 and the discharge sensor 307 are bonded together. The insulating ceramic coating 309 and the discharge sensor 307 are tightly attached. When needed, the insulating ceramic coating 309 has excellent insulation properties, which can effectively prevent current leakage between the discharge sensor 307 and the high-voltage terminal 2, avoid interference with the partial discharge signal detection of the discharge induction probe 308, and ensure the accuracy of the monitoring data.

[0030] In this invention, the fixing frame 310 is bonded to the high-voltage capacitor body 1, and the fixing frame 310 is screwed to the discharge sensor 307. The fixing frame 310 and the discharge sensor 307 are symmetrically arranged on the left and right sides. When needed, the fixing frame 310 can fix the discharge sensor 307 with screws to ensure that it will not loosen during contact. The fixing frame 310 is fixed to the high-voltage capacitor body 1 by adhesive bonding to avoid damage to the high-voltage capacitor body 1.

[0031] In this utility model, the vibration sensor 311 and the vibration sensing probe 312 are electrically connected. The vibration sensor 311 is a piezoelectric vibration sensor. When needed, the piezoelectric vibration sensor 311 is selected, which can capture the minute vibrations inside the high voltage capacitor body 1 caused by electrical stress, mechanical loosening, etc. It is suitable for installation in the key support parts of the outer shell of the high voltage capacitor body 1.

[0032] As can be seen from the above technical solution, in use, firstly, the high-voltage capacitor body 1 is installed in the required position. Then, the limiting bracket 301 and mounting bracket 302 are fitted onto the outside of the high-voltage capacitor body 1 and connected and fixed using external bolts. After preparation, the temperature sensor 304, partial discharge sensor 306, and vibration sensor 311 are inserted into the equipment mounting slot 303, and the online monitor 313 is fixed to the outer wall of the equipment mounting slot 303 with bolts. Subsequently, the temperature sensor 304, partial discharge sensor 306, and vibration sensor 311 are connected to the online monitor 313. After preparation, glue is applied to the inner side of the resistance sensing head 305 connected to the temperature sensor 304, and then it is attached to the high-voltage capacitor body 1. The surface of the high-voltage capacitor body 1 is covered with adhesive, and the vibration sensing probe 312, which is connected to the vibration sensor 311, is also glued to the inner side and attached to the bottom right side of the high-voltage capacitor body 1. Then, the discharge sensor 307, which is connected to the partial discharge sensor 306, is clipped to the bottom of the high-voltage terminal 2, and the two are tightly attached to each other. The discharge sensing probe 308 is attached to the surface of the high-voltage terminal 2, and the two are isolated by an insulating ceramic coating 309. Then, adhesive is applied to the bottom of the mounting bracket 310 for pasting and fixing. If maintenance is required later, the external fixing bolts can be removed to repair the discharge sensor 307. This completes the use process of a high-voltage capacitor online monitoring device.

[0033] Other embodiments of this application will readily occur to those skilled in the art upon consideration of the specification and practice of the application disclosed herein. This application is intended to cover any variations, uses, or adaptations of this application that follow the general principles of this application and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope of this application is indicated by the claims.

[0034] It should be understood that this application is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The above embodiments of this application do not constitute a limitation on the scope of protection of this application.

Claims

1. A high-voltage capacitor online monitoring device, comprising a high-voltage capacitor body (1) and a capacitor online monitoring assembly (3), wherein a high-voltage terminal post (2) is installed on the upper side of the high-voltage capacitor body (1), characterized in that: The capacitor online monitoring component (3) includes a limiting frame (301) disposed on the rear side of the high-voltage capacitor body (1), a mounting frame (302) mounted on the front side of the high-voltage capacitor body (1), an equipment mounting groove (303) welded to the front side of the mounting frame (302), a temperature sensor (304) mounted on the inner side of the equipment mounting groove (303), a resistance sensing head (305) bonded to the upper front end of the high-voltage capacitor body (1), a partial discharge sensor (306) disposed on the right side of the temperature sensor (304), and the lower end of the high-voltage terminal (2) A discharge sensor (307) is connected to the slot. A discharge sensing probe (308) is provided on the inner side of the discharge sensor (307). An insulating ceramic coating (309) is applied to the surface of the discharge sensor (307). Fixing brackets (310) are screwed to both the left and right sides of the discharge sensor (307). A vibration sensor (311) is provided on the right side of the partial discharge sensor (306). A vibration sensing probe (312) is adhered to the lower right side of the high voltage capacitor body (1). An online monitor (313) is screwed to the front side of the mounting bracket (302).

2. The online monitoring device for high-voltage capacitors according to claim 1, characterized in that, The limiting frame (301) and the mounting frame (302) are connected by screws. The limiting frame (301) and the mounting frame (302) form a slot connection with the high voltage capacitor body (1). The limiting frame (301) and the mounting frame (302) fit tightly against the high voltage capacitor body (1).

3. The online monitoring device for high-voltage capacitors according to claim 1, characterized in that, The temperature sensor (304) and the resistance sensor (305) are electrically connected, and the resistance sensor (305) is a thermistor sensor.

4. The online monitoring device for high-voltage capacitors according to claim 1, characterized in that, The discharge sensor (307) is electrically connected to the discharge sensing probe (308) and the partial discharge sensor (306), and the discharge sensor (307) and the discharge sensing probe (308) are ultra-high frequency discharge sensing structures.

5. The online monitoring device for high-voltage capacitors according to claim 1, characterized in that, The insulating ceramic coating (309) and the discharge sensor (307) are bonded together, and the insulating ceramic coating (309) and the discharge sensor (307) are tightly attached to each other.

6. The online monitoring device for high-voltage capacitors according to claim 1, characterized in that, The fixing frame (310) is bonded to the high voltage capacitor body (1), and the fixing frame (310) is screwed to the discharge sensor (307). The fixing frame (310) and the discharge sensor (307) are arranged symmetrically on the left and right sides.

7. The online monitoring device for high-voltage capacitors according to claim 1, characterized in that, The vibration sensor (311) and the vibration sensing probe (312) are electrically connected, and the vibration sensor (311) is a piezoelectric vibration sensor.

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