Multi-section porcelain shell type vacuum arc-extinguishing chamber with outer shielding structure
A vacuum interrupter and external shielding technology, which is applied to high-voltage air circuit breakers, high-voltage/high-current switches, electrical components, etc., can solve problems such as insufficient insulation performance, achieve optimized insulation performance, prolong service life, and simple structure Effect
Pending Publication Date: 2022-05-27
XIAN XD SWITCHGEAR ELECTIC CO LTD +1
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[0006] The purpose of the present invention is to provide a multi-section porcelain shell type vacuum interrupter with an outer shielding structure to solve the problem of insufficient insulation performance of the existing vacuum interrupter
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[0028] The present invention will be further described below with reference to the accompanying drawings.
[0029] In the present invention, an insulation test is carried out on the circuit breaker formed by the vacuum interrupter arranged in the metal shell. After the test, it is found that the surface of the ceramic shell of the vacuum interrupter has surface discharge. The simulation found that there is a large electric field concentration between the porcelain shells and the exposed root of the inner shield. Therefore, due to the needs of the project, the design of adding external shielding was carried out for the vacuum interrupter. Then, the design effect was simulated, and it was found that the maximum value of the electric field decreased from 25kV / mm to about 9kV / mm, indicating that the optimized design had an obvious effect of uniform electric field strength.
[0030] like figure 1 As shown, the present invention provides a multi-section ceramic shell type vacuum in...
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The invention discloses a multi-section porcelain shell type vacuum arc-extinguishing chamber with an outer shielding structure. The multi-section porcelain shell type vacuum arc-extinguishing chamber comprises a vacuum arc-extinguishing chamber body (1) and a shielding structure (2), the vacuum arc-extinguishing chamber body (1) is provided with a plurality of sections of porcelain shells, an inner shielding cover is arranged between every two adjacent sections of porcelain shells, and a shielding structure (2) protruding towards the outside of the porcelain shell is arranged in the circumferential direction of the root of each inner shielding cover. Under the condition that the diameter of the vacuum arc-extinguishing chamber is not obviously increased, the shielding structure is additionally arranged at the position where the inner shielding cover is welded between the ceramic shells, so that the effect of balancing an electric field outside the vacuum arc-extinguishing chamber of a multi-section ceramic shell structure with multiple inner shielding covers is achieved, and the problem of electric field concentration at a three-phase junction point is solved.
Description
technical field [0001] The invention belongs to the field of medium and high voltage vacuum switches, in particular to a multi-section ceramic shell type vacuum interrupter with an outer shielding structure. Background technique [0002] SF 6 Due to its excellent insulation and arc extinguishing properties, gas is widely used in power systems, but at the same time, as a highly stable and strong greenhouse effect gas (its GWP value is 23,500, and its atmospheric life is 3,200 years), it provides a long-term living environment for human beings. serious impact. Limit or reduce SF in power system equipment 6 The use and discharge of gas is imperative. The vacuum interrupter has the characteristics of high insulation performance and environmental friendliness, and has been widely used in the medium voltage field (12 ~ 40.5kV), and is regarded as one of the important choices to replace the SF6 gas switch in the field of high voltage power transmission. [0003] Under normal ci...
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Login to View More IPC IPC(8): H01H33/664H01H33/662
CPCH01H33/664H01H33/66261
Inventor 朱凯常治国李欣马占峰阮艳丽栾日维仝润东万媛
Owner XIAN XD SWITCHGEAR ELECTIC CO LTD