Gapless metal oxide arrester

An oxide, gapless technology, used in overvoltage protection resistors, varistors, etc., can solve the problems of excessively long axial length of the core body, low overvoltage capability, and uneven distribution of field strength. Anti-vibration performance, reduce leakage current, improve the effect of overvoltage release capability

Active Publication Date: 2014-11-05
STATE GRID CORP OF CHINA +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The arrester has the following disadvantages: the cylinder adopts a straight cylindrical structure without a smooth transition structure, the mechanical strength is low, and there are many welds, which may easily cause uneven distribution of field strength; the axial length of the core is too long, and the capacity of the resistor group is small. The ability to release the voltage is low, and the stability of the power station is not high

Method used

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Embodiment Construction

[0022] Embodiment 1 of the present invention, as Figure 1-8 As shown: the gapless metal oxide arrester includes a base 1, a cylinder 2 fixedly assembled on the base 1, a core fixed in the cylinder 2, a pressure equalizing cover 3 fixedly sleeved on the upper part of the core, and a fixed sleeve The protective cover 4 provided on the upper end of the cylinder body 2, an insulator is provided at the opening of the upper end of the cylinder body 2, and the insulator is a basin-type insulator 6, and an electrical connector 5 is fixedly mounted on the basin-type insulator 6, and the lower end of the electrical connector 5 is fixed Conductive rod 7 is arranged. The electrical connector 5, the conductive rod 7 and the core are electrically connected in sequence. The lower end of the conductive rod 7 is inserted into the pressure equalizing cover 3 .

[0023] The core body includes an upper platen 8 and a cylinder located below the upper platen 8. The number of cylinders is four, a...

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Abstract

The invention relates to a protection apparatus for a 550 kV gas insulated switchgear, especially to a gapless metal oxide arrester. The gapless metal oxide arrester comprises insulating rods sleeved by a plurality of layers of resistor discs. The number of the insulating rods is two or more than two; each insulating rod is further sleeved by a plurality of layers of insulating spacers arranged among different layers of the resistor discs at an interval. The gapless metal oxide arrester further comprises connecting pieces in conductive connection with the resistor discs on different insulating rods. The resistor discs on different insulating rods are in tandem electrical connection through connection of the connecting pieces. Compared with the prior art, the invention has the following advantages: the axial length of the insulating rod in a core can be reduced, great capacity of the resistor discs is realized, energy absorption capability and overvoltage discharging capability of the arrester are improved, and stable operation of a power station is guaranteed.

Description

technical field [0001] The invention relates to a protection device for a 550kV fully enclosed combined electrical appliance, in particular to a gapless metal oxide lightning arrester. Background technique [0002] The Chinese patent application number 200920088132.9 discloses a gapless metal oxide arrester, which includes a base, a cylinder, a core, a high-voltage insulator, and a protective cover. It is provided with an insulating backing plate, a diversion copper bar, a resistance sheet group, a gasket, a spring seat, a compression spring, and a pressure equalizing cover. The resistance sheet group is composed of a group of layered distribution and connected up and down sequentially. The high voltage insulator is electrically connected to the core body through the conductive rod. The lower end of the conductive rod is provided with a conductive rod connecting body, and the conductive rod connecting body is fixed above the pressure equalizing cover. The arrester has the ...

Claims

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Application Information

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IPC IPC(8): H01C7/12
Inventor 孟庆喜刘晓焱韩项峰何超王冠韶赵新科
Owner STATE GRID CORP OF CHINA
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