CN216747992U - Vacuum circuit breaker contact ablation detection device - Google Patents
Vacuum circuit breaker contact ablation detection device Download PDFInfo
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- CN216747992U CN216747992U CN202122637834.1U CN202122637834U CN216747992U CN 216747992 U CN216747992 U CN 216747992U CN 202122637834 U CN202122637834 U CN 202122637834U CN 216747992 U CN216747992 U CN 216747992U
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Abstract
The utility model discloses a contact ablation detection device of a vacuum circuit breaker, which comprises a milliammeter, a current-limiting resistor, a discharge tube, an integrating capacitor, a direct-current high-voltage generator and an insulating silicon rubber cylindrical container, wherein an arc extinguish chamber of the vacuum circuit breaker to be detected is placed in the insulating silicon rubber cylindrical container; the current-limiting resistor is connected in parallel with the high-voltage output end of the direct-current high-voltage generator after being connected in series with the discharge tube, the positive pole of the high-voltage output end of the direct-current high-voltage generator is sequentially connected in series with the milliammeter and one end of the break of the arc extinguish chamber of the tested vacuum circuit breaker, the other end of the break of the arc extinguish chamber of the tested vacuum circuit breaker is connected with the negative pole of the high-voltage output end of the direct-current high-voltage generator, and the integrating capacitor is connected in parallel with the discharge tube. The utility model realizes the on-site direct detection of the short-circuit breaking capacity of the circuit breaker by using a portable detection instrument, overcomes the huge energy consumption consumed during the arc extinguishing capacity detection operation of the circuit breaker, and has little damage to the tested equipment.
Description
Technical Field
The utility model relates to the field of power equipment detection, in particular to a vacuum circuit breaker contact ablation detection device.
Background
The vacuum circuit breaker has the advantages of small volume, light weight, suitability for frequent operation and no need of maintenance for arc extinction, and is relatively popularized in power distribution networks. However, in the actual operation of the vacuum circuit breaker, it is not uncommon that an abnormal accident, even an explosion accident of the arc extinguishing chamber, occurs, and especially, the vacuum circuit breaker for switching the capacitor is frequently operated, and the explosion accident caused by contact bounce, mechanism slow-breaking and slow-closing, vacuum leakage and the like occurs frequently.
The vacuum circuit breaker has small mechanical stroke and high difficulty in preventive tests of mechanical characteristics, and for a vacuum arc-extinguishing chamber, gas components are difficult to detect like an SF6 circuit breaker, so that vacuum leakage or internal arc decomposers cannot be found even if the vacuum leakage or the internal arc decomposers exceed standards, and the preventive tests of breaking capacity and mechanical characteristics of the vacuum circuit breaker are difficult to effectively develop due to the structural characteristics of the vacuum circuit breaker.
Therefore, until now, the detection of the arc extinguishing characteristic of the vacuum circuit breaker still stays at a very rough original stage, only the energy storage circuit is switched on and off for a plurality of times and the switching on and off time is normal, the fracture withstand voltage and the direct current resistance are normal, if the arc contact of the arc extinguishing chamber is worn, vacuum leakage occurs and the pull rod is jammed by friction, the detection items obviously cannot effectively reflect, but the actual arc extinguishing capability is reduced definitely. Therefore, the existing repair and test detection standard of the vacuum circuit breaker has great defects, and mechanical abnormity and arc extinguishing capacity reduction hidden danger of the circuit breaker can not be timely and effectively found out sometimes, and along with the development of the technology and the increasing improvement of the state repair and test requirements, the most important vacuum circuit breaker in primary equipment of a power grid below 35KV needs to have a technical method capable of conveniently and effectively detecting the arc extinguishing capacity of the vacuum circuit breaker.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a vacuum circuit breaker contact ablation testing device which can conveniently and effectively detect the arc extinguishing capability of a vacuum circuit breaker.
In order to solve the technical problems, the utility model adopts a technical scheme that: the provided ablation detection device for the contact of the vacuum circuit breaker comprises a milliammeter, a current-limiting resistor, a discharge tube, an integrating capacitor, a direct-current high-voltage generator and an insulating silicon rubber cylindrical container, wherein an arc extinguish chamber of the vacuum circuit breaker to be detected is placed in the insulating silicon rubber cylindrical container;
the current-limiting resistor is connected in parallel with the high-voltage output end of the direct-current high-voltage generator after being connected in series with the discharge tube, the positive pole of the high-voltage output end of the direct-current high-voltage generator is sequentially connected in series with the milliammeter and one end of the break of the arc extinguish chamber of the tested vacuum circuit breaker, the other end of the break of the arc extinguish chamber of the tested vacuum circuit breaker is connected with the negative pole of the high-voltage output end of the direct-current high-voltage generator, and the integrating capacitor is connected in parallel with the discharge tube.
In a preferred embodiment of the utility model, two ends of the arc extinguish chamber of the tested vacuum circuit breaker respectively extend out of the central positions of the upper bottom surface and the lower bottom surface of the insulated silicon rubber cylindrical container.
In a preferred embodiment of the utility model, the diameter of the upper bottom surface and the lower bottom surface of the insulating silicon rubber cylindrical container is not less than 15cm, and the height of the insulating silicon rubber cylindrical container is the same as the length of the insulating porcelain bushing of the arc extinguish chamber of the tested vacuum circuit breaker.
Further, the inside of the insulating silicon rubber cylindrical container is filled with vaseline.
In a preferred embodiment of the present invention, the voltage range of the output of the DC high voltage generator is 200-1000V.
The beneficial effects of the utility model are:
(1) the utility model realizes the capacity of directly detecting the short-circuit breaking of the breaker on site by using a portable detection instrument. The utility model discloses a method for detecting the breaking capacity of the short-circuit current of a breaker, which comprises the following steps that a detection instrument with extremely large capacity is required for testing the breaking capacity of the short-circuit current of the breaker in the prior art, and the detection instrument is difficult to use on site, so that a plurality of hidden dangers of a power grid caused by the hidden dangers of the hidden dangers due to insufficient arc extinguishing capacity cannot be found by visual detection means;
(2) the utility model overcomes the huge energy consumption consumed during the operation of detecting the arc extinguishing capability of the circuit breaker. The arc extinguishing capability test of the circuit breaker generally needs to be carried out under the short-circuit working condition, the short-circuit test of high-voltage power equipment under rated voltage consumes huge energy, instantaneous impact of a power grid can be caused during the test, and the energy consumption of one-time test of the vacuum circuit breaker above 35KV can reach dozens of degrees;
(3) the utility model has little damage to the tested equipment. The arc extinguishing capability of the circuit breaker must be tested under the short-circuit working condition of AC rated voltage in the prior art, the strong arc burning of the short-circuit working condition can bring different degrees of damage to the arc extinguishing chamber of the circuit breaker, and the high-voltage circuit breaker can only cut off short-circuit current for dozens of times.
Drawings
Fig. 1 is a schematic circuit diagram of a vacuum circuit breaker contact erosion detection apparatus of the present invention.
The parts in the drawings are numbered as follows: 1. milliammeter, 2, current-limiting resistor, 3, discharge tube, 4, integrating capacitor, 5, direct current high voltage generator, 6, insulating silicon rubber cylindrical container, 7, vacuum circuit breaker arc extinguish chamber under test.
Detailed Description
The following detailed description of the preferred embodiments of the present invention, taken in conjunction with the accompanying drawings, will make the advantages and features of the present invention more comprehensible to those skilled in the art, and will thus provide a clear and concise definition of the scope of the present invention.
Referring to fig. 1, an embodiment of the present invention includes:
a contact ablation detection device of a vacuum circuit breaker comprises a milliammeter 1, a current-limiting resistor 2, a discharge tube 3, an integrating capacitor 4, a direct-current high-voltage generator 5 and an insulating silicon rubber cylindrical container 6, wherein an arc extinguish chamber 7 of the vacuum circuit breaker to be detected is placed in the insulating silicon rubber cylindrical container 6, and two ends of the arc extinguish chamber respectively extend out of the center positions of the upper bottom surface and the lower bottom surface of the insulating silicon rubber cylindrical container 6. After the current-limiting resistor 2 is connected in series with the discharge tube 3, the current-limiting resistor is connected in parallel with the high-voltage output end of the direct-current high-voltage generator 5, the positive pole of the high-voltage output end of the direct-current high-voltage generator 5 is sequentially connected in series with the milliammeter 1 and one end of a fracture of the arc extinguish chamber 7 of the tested vacuum circuit breaker, the other end of the fracture of the arc extinguish chamber 7 of the tested vacuum circuit breaker is connected with the negative pole of the high-voltage output end of the direct-current high-voltage generator 5, and the integrating capacitor 4 is connected in parallel with the discharge tube 3.
The inner part of the insulating silicon rubber cylindrical container 6 is filled with vaseline, the diameter of the upper bottom surface and the diameter of the lower bottom surface of the insulating silicon rubber cylindrical container are not less than 15cm, and the height of the insulating silicon rubber cylindrical container is the same as the length of an insulating porcelain bushing of an arc extinguish chamber 7 of the tested vacuum circuit breaker.
The detection device detects the arc extinguishing capacity change of the circuit breaker by detecting the ablation condition of the contact. Generally, when a circuit breaker contact withstand voltage test is carried out, the circuit breaker contact withstand voltage test is limited by external insulation, and high voltage cannot be applied, so that the ablation condition of the circuit breaker contact cannot be effectively reflected, and the weakening of arc extinguishing capability is more difficult to reflect. Therefore, the utility model adopts the insulating silicon rubber cylindrical container 6, the container can place the arc extinguish chamber 7 of the tested circuit breaker into the container due to the elasticity of the silicon rubber, and the semisolid state vaseline is utilized to play a role in strengthening the external insulation, so that the voltage of the fracture withstand voltage test can be greatly improved, and the ablation condition of the contact can be reflected.
Further, the dc high voltage generator 5 may adopt a dc high voltage power supply, and the output voltage range is 200-1000V.
The working principle of the utility model is as follows:
if the arc extinguishing ability of the circuit breaker is normal, the contact can bear the direct current withstand voltage test voltage of several times of rated voltage, if the arc extinguishing ability of the circuit breaker is insufficient, the voltage is easy to break down and conduct after rising, but because the direct current voltage is controllable, the whole energy is small, the arc extinguishing chamber can not be damaged, through checking the reading of the milliammeter 1, and through the discharge tube 3 and the charging and discharging action of the integrating capacitor 4, pulse-shaped test voltage can be formed at the two ends of the contact of the circuit breaker, the base voltage threshold value of the contact is further accurately verified, meanwhile, because the pulse-shaped test voltage energy is small, the contact is further protected from burning loss of the test voltage. The utility model can conveniently test the real voltage-resisting level of the breaker fracture, thereby timely and sensitively discovering the burning hidden trouble and avoiding the accident hidden trouble caused by the insufficient arc extinguishing capability of the breaker.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes performed by the present specification and drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (5)
1. A contact ablation detection device of a vacuum circuit breaker is characterized by comprising a milliammeter, a current-limiting resistor, a discharge tube, an integrating capacitor, a direct-current high-voltage generator and an insulating silicon rubber cylindrical container, wherein an arc extinguish chamber of the vacuum circuit breaker to be detected is placed in the insulating silicon rubber cylindrical container;
the current-limiting resistor is connected in parallel with the high-voltage output end of the direct-current high-voltage generator after being connected in series with the discharge tube, the positive pole of the high-voltage output end of the direct-current high-voltage generator is sequentially connected in series with the milliammeter and one end of the break of the arc extinguish chamber of the tested vacuum circuit breaker, the other end of the break of the arc extinguish chamber of the tested vacuum circuit breaker is connected with the negative pole of the high-voltage output end of the direct-current high-voltage generator, and the integrating capacitor is connected in parallel with the discharge tube.
2. The apparatus for detecting ablation of a contact of a vacuum circuit breaker according to claim 1, wherein two ends of the arc extinguish chamber of the vacuum circuit breaker to be detected respectively extend out from the central positions of the upper and lower bottom surfaces of the cylindrical container of the insulating silicon rubber.
3. The contact ablation detection device of the vacuum circuit breaker as claimed in claim 1, wherein the diameter of the upper and lower bottom surfaces of the insulating silicon rubber cylindrical container is not less than 15cm, and the height is the same as the length of the insulating porcelain bushing of the arc extinguish chamber of the vacuum circuit breaker to be detected.
4. The vacuum circuit breaker contact ablation detecting apparatus according to any one of claims 1 to 3, wherein the inside of the insulating silicone rubber cylindrical container is filled with vaseline.
5. The apparatus for detecting ablation in a contact of a vacuum circuit breaker as claimed in claim 1, wherein the dc high voltage generator outputs a voltage in the range of 200-1000V.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122637834.1U CN216747992U (en) | 2021-10-29 | 2021-10-29 | Vacuum circuit breaker contact ablation detection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122637834.1U CN216747992U (en) | 2021-10-29 | 2021-10-29 | Vacuum circuit breaker contact ablation detection device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216747992U true CN216747992U (en) | 2022-06-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122637834.1U Active CN216747992U (en) | 2021-10-29 | 2021-10-29 | Vacuum circuit breaker contact ablation detection device |
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|---|---|
| CN (1) | CN216747992U (en) |
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2021
- 2021-10-29 CN CN202122637834.1U patent/CN216747992U/en active Active
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