Direct-current ice-melting isolating switch

Abstract

The invention discloses an isolating switch which accesses direct current to a high-voltage power transmission line in direct-current ice melting of the high-voltage power transmission line in winter. The isolating switch for direct-current ice melting provided by the invention is simple and safe in operation, is small in occupied area, is simple in structure, is investment-saving, comprises an alternating-current support insulator, a direct-current support insulator and an operation support insulator that are installed on an isolating switch support; the alternating-current support insulator is provided with an alternating-current wiring terminal and a static contact which are connected; the direct-current support insulator is provided with a vertically-arranged electric conducting disconnecting link and a direct-current wiring terminal which are connected; an operating mechanism connecting rod of the electric conducting disconnecting link is connected with the electric conducting disconnecting link through the operation support insulator; and the static contact is arranged above the electric conducting disconnecting link, and when the electric conducting disconnecting link is switched on, a moving contact of the electric conducting disconnecting link is connected with the static contact. According to the invention, the danger of manual operation is avoided, the occupied area is small, the investment is saved, and the operation is convenient.

Description

technical field [0001] The invention relates to high-voltage power transmission and transformation equipment in an electric power system, in particular to an isolating switch for connecting the DC current of a DC ice-melting device to the high-voltage transmission line when the high-voltage transmission line needs DC ice melting in winter. Background technique [0002] The icing of transmission lines in freezing, rainy and snowy weather in winter is a natural disaster that seriously threatens the safe and stable operation of power systems. Due to the increased ice load on the conductors, it will cause certain mechanical damage to the conductors, iron towers and fittings. Current DC ice melting technology is widely used in melting ice of transmission lines with different voltage levels and different conductor cross-sections. The principle of this method is to use the ice-coated line as a load, apply a DC power supply, and use a lower voltage to provide a DC short-circuit curr...

AI Technical Summary

Problems solved by technology

In order to ensure the safe distance of the equipment, the wall of this scheme needs to be expanded. At the same time, in order to meet the connection between the jumper trolley and the line, it is necessary to install a special connecting pipe busbar, and also need to configure a special trolley with the function of isolating switch. A single trolley is 1.5 million , a total of three trolleys are needed for each round of ice melting, totaling 4.5 million yuan, so the investment is large and the cost is high. At the same time, the construction of a special parking garage is required, and the operation of the trolleys is complicated due to the influence of the site environment

Images