Porcelain knob breaker

Abstract

This invention relates to converter device and to high pressure knob breaker, which comprises comprise three phase or single phase knob, knob lever and structure case, wherein, the knob adopts high voltage SF6 gas as arc extinction and insulator medium; each knob column knob down end is located with heating device; the heater device comprises temperature controller, heater, contact and heater breaker; the above elements form heater circuit.

Description

technical field [0001] The invention relates to a power transmission and transformation equipment, in particular to a high-voltage porcelain column circuit breaker. Background technique [0002] Patent No. ZL200420027316.1 discloses an outdoor high-voltage self-energized sulfur hexafluoride circuit breaker, which uses high-voltage SF6 gas as the arc extinguishing and insulating medium. Outdoor high-voltage circuit breakers are used in a wide range. For example, in Xinjiang, Inner Mongolia and Northeast China, the winter climate is cold, and the outdoor temperature reaches -40°C, and some areas even reach -50°C. Liquefied, the gas pressure is reduced to the blocking pressure value, the circuit breaker cannot work normally, and has to be out of operation, and in serious cases, it will cause a large-scale power outage. [0003] In order to solve the problem of reliable operation of high-voltage SF6 circuit breakers at ultra-low temperatures, relevant manufacturers and research...

AI Technical Summary

Problems solved by technology

[0004] 1. The mixed gas (SF6 / N2; SF6 / CF4, etc.) is used as the arc extinguishing and insulating medium. The disadvantage is that the breaking current capacity of the circuit breaker is only about 80% of the original; the mixing method of the mixed gas ratio needs to be reasonably matched. Otherwise, the insulating properties and arc extinguishing properties of the mixed gas will be severely weakened, and once the gas leaks, the supplementary gas process is very complicated and cannot meet the product technical requirements

[0005] 2. Reduce the SF6 gas pressure to reduce the liquefaction point of SF6 gas, but due to the reduction of gas pressure, the gas density also decreases, resulting in a decrease in the arc extinguishing performance and insulation performance of the circuit breaker

Directly affect the breaking current capacity of the circuit breaker

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