Vacuum arc-extinguishing device for ultrahigh-voltage isolation

Abstract

The invention discloses a vacuum arc-extinguishing device for ultrahigh-voltage isolation, which comprises a power part, an energy-storing unit, an executing part and an arc-extinguishing part. In the invention, a movable conductive rod of an isolating switch is used as a power source, and an arc-extinguishing chamber is opened or closed by a shifting fork-driving mechanism. When the isolating switch is switched on, the arc-extinguishing device is firstly switched on and bears a switching-on transfer current before contacting with a main contact. When the isolating switch is switched off, the main contact of the isolating switch is firstly switched off, and the arc-extinguishing device temporarily conducts the current and finally switches off to take the arc-extinguishing action. The invention solves the circumfluence and arc-extinguishing problems by the series compensation of a switching bus of the parallel-connected ultrahigh-voltage isolating switch and has the advantages of reasonable structure, reliable transmission, convenient operation and good arc-extinguishing performance.

Description

technical field [0001] The invention relates to a vacuum arc extinguishing device used in an ultra-high voltage isolating switch. Background technique [0002] For the double-bus power supply circuit, due to the high price of the bus-tie circuit breaker, the series-compensated parallel isolating switch is usually directly used as the double-bus switch. It satisfies the separation switch requirements, but for the 1100kV power supply circuit, due to the high voltage level, when the isolator operates, the relative potential difference of the busbar is large (the potential difference of the given parameter of the State Grid is 6kV, and the transfer current is 6300A). It has breaking capability, but cannot eliminate the arc, causing severe contact burnout, cannot be used for switching between buses of extra-high voltage isolating switches, and cannot meet the requirements of extra-high voltage isolating switches in special use occasions. Contents of the invention [0003] In o...

AI Technical Summary

Problems solved by technology

[0002]For double-bus power supply circuits, due to the high price of bus-tie circuit breakers, generally series-compensated and parallel-connected isolating switches are directly used as double-bus transfer switches. For power supply circuits below 500kV, due to The relative potential difference of the busbar is small, and the conventional design of the isolation arc contact can meet the requirements of the disconnector. However, for the 1100kV power supply circuit, due to the high voltage level, the relative potential difference of the busbar is large when the isolator is in operation (the potential difference of the given parameter of the State Grid is 6kV, the transfer current is 6300A), when the isolating switch is operated, because it does not have the breaking ability, the arc cannot be eliminated, and the contacts are burned seriously. Requirements in special use occasions

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