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Protection device and series compensation system for metal oxide varistor in series compensation

A protection device and series compensation technology, applied in emergency protection circuit devices for limiting overcurrent/overvoltage, emergency protection circuit devices, reactive power compensation, etc., can solve losses, inherently slow operating time, capacitor banks and MOV Overvoltage burnout and other problems, to achieve safe operation and reduce failure rate

Active Publication Date: 2012-11-21
XJ ELECTRIC +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the inherent action time of the current bypass switch is relatively slow (at least 30ms). In actual projects, due to untimely protection, it often occurs that the capacitor bank and MOV are burned out due to overvoltage.
causing great loss

Method used

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  • Protection device and series compensation system for metal oxide varistor in series compensation
  • Protection device and series compensation system for metal oxide varistor in series compensation
  • Protection device and series compensation system for metal oxide varistor in series compensation

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Embodiment Construction

[0020] The specific embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

[0021] Such as figure 1 As shown, conventional capacitor protection devices include devices such as metal oxide voltage limiters (MOVs), spark gaps, bypass circuit breakers, and current-limiting damping resistors. When the line is short-circuited, the short-circuit current will definitely generate high voltage on the series-compensated capacitor bank. The function of MOV is to absorb the energy of the short-circuit current and limit the overvoltage on the capacitor bank. When the energy absorbed by the MOV exceeds its own allowable limit absorption When the energy is high, the series compensation control device will start the spark gap and bypass circuit breaker, bypass the capacitor bank and MOV, so as to protect the capacitor bank. Due to the limited capacity of the spark gap, the series compensation control device must simultaneously act...

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PUM

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Abstract

The invention relates to a protection device and a series compensation system for an MOV (Metal Oxide Varistor) in the series compensation, and belongs to the technical field of high-voltage protection systems. The protection device is connected in parallel with the two ends of the MOV, and comprises bypass circuit breaker, a damping circuit and an electronic switch, wherein the bypass circuit breaker and the electronic switch are connected in series with the damping circuit after being connected in parallel. According to the invention, the protection device, which is arranged at the two ends of the MOV in the series compensation system, comprises the bypass circuit breaker, the damping circuit and the electronic switch, and the bypass circuit breaker and the electronic switch are connected in series with the damping circuit after being connected in parallel. According to the invention, the electronic switch, which replaces a traditional spark gap, and the bypass circuit breaker having a harsh demand on the closing time are adopted to reduce the fault rate of both a series compensation capacitor group and the MOV, which is caused by over voltage, to the utmost, so that the reliable and safe operation of the series compensation capacitor group and the MOV is ensured.

Description

technical field [0001] The invention relates to a protection device for a metal oxide voltage limiter in series compensation and a series compensation system, belonging to the technical field of high voltage protection systems. Background technique [0002] The use of series capacitor compensation devices in ultra-high-voltage large-capacity long-distance AC transmission systems can reduce line impedance, improve reactive power balance, increase transmission capacity of transmission lines, and reduce line losses, thereby making full use of existing grid resources and reducing transmission costs. It saves valuable land resources for the society, saves huge line construction expenditures for the country, and brings considerable economic benefits to power companies. At present, more than 50 sets of series compensation devices have been put into operation in my country, covering various voltage levels of 500KV and below, and there are still many series compensation projects unde...

Claims

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Application Information

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IPC IPC(8): H02H9/04H02J3/18
CPCY02E40/30
Inventor 姚为正张建何青连王颖博洪波马俊民范彩云胡四全贾艳玲
Owner XJ ELECTRIC
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