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Protective resistor for use in ultrahigh-voltage very fast transient overvoltage test

A technology for transient overvoltage and resistance protection, applied in the direction of resistance elements adjusted by short-circuiting different numbers of resistance elements, resistor installation/support, etc. protection, etc.

Inactive Publication Date: 2010-11-10
STATE GRID ELECTRIC POWER RES INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the protective resistor is used outdoors, the outer layer of silica gel or RTV will break or fall off after being exposed to the air for a long time, resulting in the loss of protection of the resistance wire of the protective resistor and shortening the service life.

Method used

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  • Protective resistor for use in ultrahigh-voltage very fast transient overvoltage test
  • Protective resistor for use in ultrahigh-voltage very fast transient overvoltage test
  • Protective resistor for use in ultrahigh-voltage very fast transient overvoltage test

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Embodiment Construction

[0026] In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0027] The purpose of the present invention is to provide a protective resistor for UHV fast transient overvoltage test, which can prevent structural deformation or insulation damage of the protective resistor when it is used outdoors.

[0028] refer to figure 1 , is a schematic diagram of the structure of the protection resistor used in the UHV fast transient overvoltage test according to Embodiment 1 of the present invention.

[0029] The protective resistor includes: a connecting flange 10 , an insulating cylinder 20 , a resistance wire 30 , a middle uniform ring 40 and an end uniform ring 50 .

[0030] Wherein, the insulating cylinder 20 and the resistance wire 30 constitute a resistance body; the resistance wire 30 is wound ...

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Abstract

The invention discloses a protective resistor for use in an ultrahigh-voltage very fast transient overvoltage test, which comprises a connecting flange, a resistor body, middle uniform rings and end uniform rings, wherein the resistor body comprises an insulating barrel which is wounded with at least two layers of resistance wires; both of the two ends of the insulating barrel are connected with a connecting flange by a middle uniform ring; the other end of each connecting flange is connected with an end uniform ring; spiral grooves are formed on the outside surface of the insulating barrel; the resistance wires are wound in the spiral grooves; and the outside surface of the insulating barrel is wounded with an epoxy glass silk ribbon and cured after being wounded with each layer of resistance wires. When the embodiment of the invention is used, the structural deformation or insulation damage of the protective resistor used outdoor are prevented.

Description

technical field [0001] The invention relates to the technical field of UHV testing, in particular to a protective resistor for UHV rapid transient overvoltage testing. Background technique [0002] When performing VFTO: Very Transient Over-voltage (VFTO: Very Transient Over-voltage) test on gas-insulated combined electrical equipment (GIS: Gas Insulated Switchgear), in order to limit the system short-circuit current and protect the test power supply, it is necessary to connect a protective resistor to the test circuit. [0003] In the prior art, for high-voltage circuits below 500kV, the protective resistor is usually made by winding resistance wire on an insulating cylinder, or using resistance wire as weft and glass wire as warp to weave a ribbon resistor, and then the ribbon resistor Wrapped in insulating barrel. Among the existing protective resistors, the resistance wire mostly adopts the non-inductive winding method, which can be wound in multiple layers. The insulat...

Claims

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Application Information

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IPC IPC(8): H01C10/08H01C1/01
Inventor 马少石陈国强姚涛戴敏李振强李建刚
Owner STATE GRID ELECTRIC POWER RES INST
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