Quick-acting bypass switch

Abstract

The invention discloses a quick-acting bypass switch which is a gas spark switch and comprises a high-voltage electrode and a ground electrode. The quick-acting bypass switch is characterized in that: the bypass switch leads to forming of spraying plasma in a switch gap and continuous frontward development of the spraying plasma through forming the spraying plasma on the surface of the ground electrode and injecting into the switch gap; when a residual gap between the head of the plasma and a high-voltage electrode shortens continuously and leads to severe distortion of an electric field, gap discharge is caused, and furthermore conduction of a whole switch is caused, thereby realizing quick conduction of the switch. Because plasma in the switch gap provides a large amount of initial electrons for gap discharge, insulating strength of the gap is reduced, and therefore quick discharging of the switch can be triggered under an ultralow work coefficient which equals with 5%-10% self-breakdown voltage.

Description

technical field [0001] The invention relates to the field of fast bypass switch manufacturing in power systems, in particular to a fast-acting bypass switch. Background technique [0002] Due to its simple structure and fast breaking speed, fast bypass switches are widely used in power system fault current limiting, series compensation capacitor protection gaps, DC circuit breakers and many other occasions. With the further development of high-voltage and large-capacity transmission systems, in order to ensure the reliability of power supply for important loads, it is required that the bypass switch can operate quickly in a very short time after a fault occurs. [0003] At present, the bypass switch in the power system usually adopts a mechanical switch, and its typical switching time is between several seconds to tens of seconds. The switching speed is not ideal and cannot meet the requirements of its fast action. When a gas spark switch is used as a bypass switch, since i...

AI Technical Summary

Problems solved by technology

[0003] At present, the bypass switch in the power system usually adopts a mechanical switch, and its typical switching time is between several seconds to tens of seconds. The switching speed is not ideal and cannot meet the requirements of its fast action.

When a gas spark switch is used as a bypass switch, since it is usually triggered by an electric pulse, its effective working coefficient ranges from 60% to 85%. If the voltage continues to drop, the switch cannot be reliably triggered and turned on. When the voltage is near the zero crossing point, the switch cannot operate reliably, and cannot respond quickly to this fault

Therefore, the existing bypass switches cannot meet the performance requirements of fast trigger conduction under low operating coefficients

Images