Self-powered circuit breaker and air cylinder assembly thereof

Abstract

The invention relates to the field of high-voltage circuit breakers, in particular to a self-powered circuit breaker and an air cylinder assembly thereof. The self-powered circuit breaker comprises an air cylinder assembly, wherein the air cylinder assembly comprises an air compression chamber air cylinder and an expansion chamber air cylinder; one end of the air compression chamber air cylinder is closed by a valve base, and the other end of the air compression chamber air cylinder has an open structure; the expansion chamber air cylinder is spliced into the open end of the air compression chamber air cylinder; one end, which is inserted into the air compression chamber air cylinder, of the expansion chamber air cylinder is further provided with a cylindrical extension segment; the valve base is provided with a convex compensating structure for being inserted into the expansion chamber air cylinder; and the size of the compensating structure is equal to the volume of the extension segment. In the self-powered circuit breaker, a plurality of contact fingers can be arranged correspondingly between the expansion chamber air cylinder and the air compression chamber air cylinder according to requirements, so that the resistance of a main loop is reduced, and the temperature rise of the circuit breaker is further reduced; and the size of the expansion chamber air cylinder does not change, so that the original short-circuit breaking performance of the circuit breaker is ensured.

Description

technical field [0001] The invention relates to the field of high-voltage circuit breakers, in particular to a self-energy circuit breaker and a cylinder assembly thereof. 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 exc...

AI Technical Summary

Problems solved by technology

However, in the current self-energized circuit breaker, due to the influence of the parameters of the expansion chamber, the length of the expansion chamber cylinder is limited, which directly leads to the inability to set corresponding, capable Satisfy the contact fingers required for breaking the current of the circuit breaker. Therefore, the rated current parameters of the current self-energy circuit breaker are actually limited, and it still cannot meet the requirements of use in some occasions.

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