Direct-current ice-melting isolating switch
A technology of isolating switch and DC ice melting, applied in electric switches, high-voltage air circuit breakers, electrical components, etc., can solve the problems of complicated operation, high cost and large investment of trolleys
Active Publication Date: 2014-04-30
四川电力设计咨询有限责任公司
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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
Method used
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[0024] The present invention will be further described below in conjunction with the accompanying drawings.
[0025] The DC deicing isolating switch and the DC bus support 7 of the present invention are installed on the outlet side of the high-voltage power distribution device in the substation.
[0026] A group of AC post insulators 2 are installed on the isolating switch bracket 1 , and a voltage equalizing ring 16 is installed on the upper end of the AC post insulators 2 . The static contact 3, the AC connection terminal 17 and the pressure equalizing ring 16 are connected as a whole. The AC connection terminal 17 is connected to the power transmission line by being connected to the AC connection wire 6 .
[0027] In this embodiment, the conductive knife switch 8 adopts the conductive knife switch structure of an electric single-arm vertical telescopic isolating switch, including a conductive rod 19, a conductive base 12, an operating post insulator 18, an operating mechan...
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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...
Claims
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IPC IPC(8): H01H31/00
Inventor 吴家林李晔王亚莉何立新王正华李根富
Owner 四川电力设计咨询有限责任公司