Circuit breaker and circuit breaker contact centering support device

Abstract

The invention discloses a circuit breaker and a centering support device for a contact of the circuit breaker, which comprises a porcelain sleeve, a core rod and a static contact arranged at the front end of the core rod. The device includes a centering block. The centering block has an inner hole through the front and rear. The centering block is provided with a guide hole connecting the inner hole of the centering block and the outside of the centering block. The guide hole is equipped with a supporting mechanism. The supporting mechanism includes a Piston slidingly and sealingly matched with the guide hole, a support rod pushed and fitted with the outer end surface of the piston, and a one-way thrust structure used to prevent the support rod from moving from outside to inside. The core rod has an air passage connected to the inner hole of the centering block. By injecting high-pressure gas into the air passage of the core rod, the high-pressure gas pushes the support rod to move from the inside to the outside, and the support rod is pressed against the inner wall of the porcelain sleeve. Due to the function of the stop structure, it can be ensured that the support rod cannot move from the outside of the centering block. Move inward to make it reliably press against the inner wall of the porcelain casing, and play a central support role for the core rod.

Description

technical field [0001] The invention relates to the field of high-voltage switchgear, in particular to a circuit breaker and a centering support device for contacts of the circuit breaker. Background technique [0002] In the ultra-high voltage power system, the circuit breaker closes the no-load long line, especially when the power supply voltage amplitude and the line residual voltage are in reverse phase. Due to the sudden change of line parameters, the oscillation of electromagnetic energy on the power grid will cause a large Voltage. In order to limit the generation of overvoltage, a closing resistor is usually installed in the circuit breaker. When closing, the closing resistor can absorb part of the electric energy in the grid and convert it into heat energy, so as to weaken the electromagnetic oscillation and limit the overvoltage. Purpose. However, in the porcelain column circuit breaker, the porcelain bushing is generally a cylindrical structure. Limited by the s...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a centering support device to solve the problems of poor centering and unstable contact of the dynamic and static contacts in the circuit breaker; at the same time, the present invention also provides a circuit breaker using the centering support device

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