Three-station isolation switch and atmospheric pressure sealed permanent magnet circuit breaker cabinet

Abstract

The invention provides a three-station isolation switch which comprises a switch moving contact knife switch device and a static contact knife switch device. The static contact knife switch device hasan isolated static contact knife switch and a grounded static contact knife switch which are disposed apart from each other. The switch moving contact knife switch device comprises a moving matchingmember, a transmission mechanism and an isolating moving contact knife switch, the switch moving contact knife switch device is selectively in contact with the isolated static contact knife switch andthe grounded static contact knife switch, one end of the transmission mechanism is connected to the moving matching member, the other end is connected to the isolated static contact knife switch, themoving matching member drives the transmission of the transmission mechanism, and therefore, the isolating moving contact knife switch is pulled to rotate. The three-station isolation switch has theadvantages that the three-station isolation switch has three independent isolation switches, an unrecoverable insulating failure caused by high-voltage breakdown between phases is avoided, therefore,the problem of safety hazard due to insulation aging is prevented, at the same time, the three-station isolation switch is arranged reasonably such that the whole body does not occupy extra space.

Description

technical field [0001] The invention relates to the field of electric power technology, in particular to a three-position isolating switch and an airtight permanent magnet circuit breaker cabinet at normal pressure. Background technique [0002] As people's awareness of environmental protection increases, the application of environmentally friendly gas-insulated and even air-insulated switchgear in power transmission and distribution equipment is becoming more and more common, and the corresponding air-insulated disconnectors have relatively high insulation requirements. The fracture, phase-to-phase and ground-to-ground power frequency withstand voltages should meet the experimental requirements of the corresponding voltage levels in an air-insulated environment at normal pressure. [0003] At present, in the actual use of medium-voltage or high-voltage ring network switchgear on the market, the two ends of the three-phase isolation fracture of the isolating switch are mostl...

AI Technical Summary

Problems solved by technology

[0003] At present, in the actual use of medium-voltage or high-voltage ring network switchgear on the market, the two ends of the three-phase isolation fracture of the isolating switch are mostly fixed on two insulating shafts respectively. The insulation performance of the insulating shaft meets the phase-to-phase insulation requirements of the switch. The insulation performance of the insulating shaft can mostly meet the phase-to-phase insulation requirements of the switch, but once the insulation of the switch ages, the insulation performance decreases, and the phase-to-phase or relatively non-recoverable insulation failure due to high voltage breakdown will cause serious damage to personal safety and power supply safety. threaten

[0004] Therefore, in the actual use of medium-voltage or high-voltage switchgear in the industry, the operating shaft of some isolating switches is made of metal materials in consideration of mechanical strength, and in order to achieve the insulation strength between it and the live part, it is usually realized by increasing the volume of the switch, but Increase the insulation distance by increasing the volume of the switch. Although the insulation strength can be increased, it will also increase the overall size of the switch cabinet, thereby increasing the production cost and land cost of the switch cabinet.

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