Method for improving converted current switching capability of ultra-high voltage alternating current open isolating switch

A technology of UHV AC and isolating switches, which is applied in high-voltage/high-current switches, electric switches, high-voltage air circuit breakers, etc., can solve the problems of great influence of environmental conditions, limited opening and closing capacity, and limited breaking capacity, etc., to achieve The effect of high switching current switching capacity, simplified operation and control, and improved reliability

Active Publication Date: 2011-02-09
CHINA ELECTRIC POWER RES INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The arc is extinguished by elongating the air arc, the breaking capacity is very limited, and it is greatly affected by the environmental conditions;
[0006] ●Severe open air arc will be generated, and its ablation and diffusion will seriously affect the safe operation of switchgear and its surrounding equipment
[0007] ●Improving the opening and closing ability is limited, and can only meet the highest parameters stipulated in the existing standards: conversion current 1600A, conversion voltage 400V, which cannot meet the conversion current switching requirements of parallel isolation switches with conversion current 6300A and conversion voltage 6000V

Method used

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  • Method for improving converted current switching capability of ultra-high voltage alternating current open isolating switch
  • Method for improving converted current switching capability of ultra-high voltage alternating current open isolating switch
  • Method for improving converted current switching capability of ultra-high voltage alternating current open isolating switch

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Embodiment Construction

[0037] Explanation of related technical terms

[0038] Series compensation (referred to as "series compensation"): A technology that uses capacitor banks connected in series in the line to offset part of the line inductance to reduce the total line impedance, which can greatly improve line transmission capacity and system stability.

[0039] Isolating switch: When in the opening position, there is an insulation distance between the contacts that meets the specified requirements and an obvious disconnection mark; when in the closing position, it can carry the current under normal circuit conditions and abnormal conditions within the specified time (such as short circuit) current switching devices.

[0040] Note: When the circuit current is "very small", or when the voltage between the two terminals of each pole of the disconnector has no significant change before and after closing and breaking, the disconnector has the ability to close and break the circuit.

[0041] Parallel ...

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Abstract

The invention belongs to the technical field of ultra-high voltage power transmission, in particular to a method for improving the converted current switching capability of an ultra-high voltage open alternating current isolating switch. Auxiliary circuits are added on a main contact to switch converted current, and isolating switches are used to guide the operation of electric poles, so that the converted current switching capability of the isolating switches can be greatly improved, and the use requirements for connecting the isolating switches in parallel can be met. Thus, by using the method, the converted current switching capability is greatly improved, the requirements for connecting the isolating switches in parallel are easily met, the influence of electric arcs is almost completely eliminated, the operation and the control of the isolating switches are greatly simplified, the cost is lowered and the reliability is improved.

Description

technical field [0001] The invention belongs to the technical field of UHV power transmission, and in particular relates to a method for improving the switching current switching capability of an UHV open-type AC isolating switch. Background technique [0002] In order to improve the transmission capacity of UHV transmission lines and improve system stability, it is necessary to install UHV series compensation devices on the line. Parallel isolating switches are used to switch the operation mode of series compensation devices. They are important operating equipment and usually use open AC isolating switch. Parallel isolating switches for UHV series compensation require switching current switching capability to meet switching current 6300A and switching voltage 6000V. According to the current standard, the maximum parameters of switching current switching capacity of conventional isolating switches are 1600A switching current and 400V switching voltage, which cannot directly...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01H33/66H01H31/00
Inventor 李志兵崔博源王承玉刘北阳
Owner CHINA ELECTRIC POWER RES INST
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