Expander for processing faults of GW20 type isolating switch in electrified mode

Abstract

The invention relates to an expander for processing faults of a GW20 type isolating switch in an electrified mode. The expander comprises an outer cylinder, a driving shaft, an outer insulating pipe,an inner insulating pipe, a transmission lead screw, an eccentric tip cone, a shifting arm and a threaded sleeve. A bearing is arranged between the driving shaft and the outer cylinder. The inner insulating pipe can move in the outer insulating pipe; one end of the outer insulating pipe is fixedly connected with the outer cylinder, and the other end is fixedly connected with the thread sleeve; oneend of the inner insulating pipe is fixedly connected with the driving shaft, the other end of the inner insulating pipe is fixedly connected with the transmission screw rod, the transmission screw rod is in threaded connection with the threaded sleeve, the end of the transmission screw rod is fixedly connected with the eccentric tip cone, the eccentric tip cone and the transmission screw rod arenot coaxial, shifting arms are symmetrically hinged to the end of the threaded sleeve, and tension springs are connected between the shifting arms. The expander has the advantages of being reasonablein structure, safe, reliable, and capable of being used when the GW20 type disconnecting switch breaks down, driving the moving contact to move beyond a certain distance, and processing the problem that the GW20 type disconnecting switch is difficult to separate in an electrified mode.

Description

technical field [0001] The invention relates to an expander for handling faults of a GW20 type isolating switch with electricity. Background technique [0002] In the 1980s, a company's newly built 220kV substation factory area was designed as a compact layout plan, and the original traditional horizontal opening type isolating switch on the ground was replaced with a vertical opening type GW20 series, which has been in operation for more than 20 years, such as GW20- 252D(W) is a single-column deflection structure, which forms a vertical insulation fracture after opening, and its opening and closing states are clear, which is convenient for inspection. Used as a bus disconnector in the power distribution device, it has the advantage of occupying a small area, especially in the connection of "double bus with bypass", the land saving effect is remarkable. In addition, its compact structure and well-enclosed transmission parts generally require little maintenance. However, in...

AI Technical Summary

Problems solved by technology

The first operation is due to the internal freezing of the single-column segregation structure, and the arc antenna at the top of the operating movable contact rod still maintains a sufficient clamping range, and the relative position of the moving and static contacts does not change at all; the second time is due to the internal contact of the single-column segregation structure. The clamping spring is weak, resulting in a small gap between the dynamic and static contacts and continuous discharge, burning, and adhesion, which seriously affects the smooth completion of the maintenance plan indicators

Under normal circumstances, one time is called accidental, two times is called connection, and three times is called inevitability. Then we have to develop a kind of expander for live operation when the 220kV isolating switch fails to solve the above safety production problems. It must be done, otherwise the 220kV substation, 220kV single busbar or double busbar will be forced to power outage, which will seriously affect the reliability of system power supply

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