Puffer type gas circuit breaker
A gas circuit breaker, gas technology, applied in the direction of high-voltage air circuit breakers, circuits, electrical components, etc., can solve the problems of pressure rise, stagnation, and low speed of insulating nozzles, and achieve the effects of improving cutting performance, suppressing stagnation, and flexible use
Inactive Publication Date: 2010-12-01
HITACHI LTD
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Problems solved by technology
[0005] However, in recent years, increasing the breaking capacity of the blower type gas circuit breaker and reducing the size of the equipment are required to improve the breaking performance. As shown in Patent Document 2, if the ablation effect is to be actively used, the initial stage of arc occurrence , the pressure in the insulating nozzle will rise above the required range due to the ablation effect
Once the pressure in the insulating nozzle rises, it will act as a reaction force on the operator, so it can be judged that there will be problems such as low speed or stagnation at the very beginning of the cutting operation, which will have a bad influence on the cutting performance.
[0006] The object of the present invention is to provide a gas blowing type gas circuit breaker which improves the breaking performance by utilizing the ablation effect while preventing the problem of the speed reduction at the beginning of the breaking operation.
Method used
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Embodiment 1
[0016] Next, a blown gas circuit breaker according to an embodiment of the present invention will be described based on the drawings. image 3 It is a cross-sectional view showing the overall structure of the blow-type gas circuit breaker, and is composed of an insulating arc extinguishing gas enclosed in a metal container 1 .
[0017] Both ends of the cut portion are led out while maintaining insulation in the metal container 1 through the central conductors 2 and 3 of the insulating lead-out device (not shown). The central conductor 2 supports and fixes a cylindrical exhaust tube 4. , a fixed conductor 14 is supported and fixed on the central conductor 3 . A fixed arc contact 5 is fixed on the central part of the exhaust cylinder 4 , and a fixed main contact 6 configured to surround the fixed arc contact 5 is fixed at the end of the exhaust cylinder 4 .
[0018] The top of the fixed arcing contact 5 is provided with a movable arcing contact 7 which is in contact in the inpu...
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A puffer type gas circuit breaker is capable of preventing a low speed at an initial period of cutting and simultaneously improving cutting performance by utilizing ablation effect. An isolation nozzle (11) is provided with an upstream side section (11a) made of isolation material with low ablation effect namely high thermal stability resin on the upstream side of a blow-in gas flow, e.g. on the upstream side of the blow-in gas flow until a throat (15) of the isolation nozzle (11), and a downstream side section (11b) made of isolation material with high ablation effect namely low thermal stability resin on the downstream side of the blow-in gas flow, so as to form the isolation nozzle (11).
Description
technical field [0001] The present invention relates to a blowing type gas circuit breaker which blows insulating arc-extinguishing gas to perform arc extinguishing using an insulating nozzle, and particularly relates to a blowing type gas circuit breaker which can improve the cut-off performance. Background technique [0002] Generally, the blowing type gas circuit breaker is composed of a fixed arc contact and a movable arc contact arranged coaxially in a contactable and separable manner, and housed in a sealed container filled with insulating fox-repelling gas such as SF6 gas. . [0003] A well-known prior art is: surrounding the space of the fixed arc contact and the movable arc contact, a cylindrical insulating nozzle is arranged, and when the current is cut off, the insulating arc-extinguishing gas is compressed by the compressing device while using this. The insulating nozzle guides and blows the arc generated by the separation of the stationary arc contact and the m...
Claims
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Login to View More IPC IPC(8): H01H33/70H01H33/91
Inventor 内山英昭佐藤贤
Owner HITACHI LTD