Disconnecting switch used for large current ice melting of high-voltage power transmission line

Abstract

The invention discloses a disconnecting switch used for large current ice melting of a high-voltage power transmission line. Two fixed contacts and an on-off control device are respectively arranged on a pedestal through insulator struts; the on-off control device comprises a conducting shaft and an insulation rotating shaft; two fixed contacts are separately arranged at two sides of the insulation rotating shaft; each fixed contact is provided with a U-shaped groove; the conducting shaft is arranged on the insulation rotating shaft, and the conducting shaft can rotate, so that two ends are respectively embedded into or are simultaneously far away from the U-shaped grooves of the two fixed contacts; a telescopic contact finger and two fixed contact fingers are arranged on two ends of the conducting shaft; the telescopic contact finger can break away from the bottom surfaces of the U-shaped grooves through sliding or be in close contact with the bottom surfaces of the U-shaped groove; the two fixed contact fingers can rotate along with the conducting shaft to break away from or be in close contact with two lateral surfaces of each U-shaped groove; the disconnecting switch further comprises a first driving component used for driving the conducting shaft to rotate along the insulation rotating shaft, a second driving component used for driving the conducting shaft to rotate along the own axis and a third driving component used for driving the telescopic contact finger to carry out concertina movement. The disconnecting switch has the advantages of reasonable structural design, good heat dissipation effect, strong through-current capability and high safe reliability.

Description

technical field [0001] The invention relates to the technical field of electrical engineering equipment, in particular to an isolating switch for high-current high-current melting ice of a high-voltage transmission line. Background technique [0002] my country is one of the countries that are seriously affected by icing disasters in the world. Icing will cause major accidents such as transmission line collapse and insulator flashover. UHV lines are used as backbone grids. Large-scale power outages are caused, which bring serious losses to power grid enterprises and the national economy. Taking 2008 as an example, the ice disaster caused large-scale collapse of towers and disconnection, causing losses to power grid companies as high as tens of billions. At present, the most effective measure to prevent and control ice disasters in the power system is to melt the ice, through the thermal effect of the current, to achieve the purpose of melting the ice. The ice-melting curren...

AI Technical Summary

Problems solved by technology

The ice-melting current is generally realized through the line on the isolating switch. The current level of the current isolating switch is about 6300A, which can meet the ice-melting of the 500kV and below lines. The UHV lines generally use eight-split conductors, and the ice-melting current is generally in the Above 10000A, the current flow level of the existing isolating switch cannot meet the ice melting of large cross-section conductors

The flow capacity of the

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