Low temperature circuit breaker body

Abstract

The invention relates to a low temperature circuit breaker body. The low temperature circuit breaker body comprises an arc extinguish chamber and a support chamber. The arc extinguish chamber mainly comprises an arc extinguish chamber ceramic sheath, a stationary contact assembly, a moving contact assembly, a nozzle and an air cylinder. The support chamber mainly comprises a support chamber ceramic sheath and an insulating pull rod. One end of the insulating pull rod is connected with a piston rod of the air cylinder. The inner diameter of the support chamber ceramic sheath is smaller than that of the arc extinguish chamber sheath, and the outer diameter of an umbrella tray of the support chamber ceramic sheath is smaller than that of the arc extinguish chamber sheath. The nozzle is located in the middle of the arc extinguish chamber sheath when the circuit breaker is on-position. The inner diameter of the original ceramic sheath is reduced so as to reduce material consumption of the sheath. The amount of sulfur hexafluoride gas is correspondingly reduced, the manufacturing cost is low and the structure is more compact. The nozzle is located on one side close to a moving wire holder in the arc extinguish chamber ceramic sheath when the circuit breaker is on-position so that a blowing part of the nozzle in the opening process is close to the moving wire holder so as to provide an enough buffering distance and radiating space for sulfur hexafluoride gas to guarantee the insulating strength.

Description

technical field [0001] The invention relates to a circuit breaker body, in particular to a low-temperature circuit breaker body with low manufacturing cost. Background technique [0002] Circuit breakers are one of the main electrical equipment in substations. It can not only cut off and connect high-voltage lines and various no-load and load currents when the system is running normally, but also cut off various overload currents automatically, quickly and reliably through the function of the relay protection device when the system fails. and short-circuit current to prevent the occurrence and expansion of the scope of the accident. Sulfur hexafluoride circuit breaker is a new type of switch using sulfur hexafluoride gas as insulating medium and arc extinguishing medium. Sulfur hexafluoride gas is a colorless, odorless, non-toxic, non-flammable inert gas with high electrical strength and good arc extinguishing performance, and its dielectric strength far exceeds that of tr...

AI Technical Summary

Problems solved by technology

This kind of structure has certain disadvantages: the size of the porcelain sleeve is large, there are many consumables, and the amount of sulfur hexafluoride gas filled in it is correspondingly large, and the manufacturing cost of the circuit breaker body is high.

The setting of the arc extinguishing chamber cover further increases the manufacturing cost

Images