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No Dead Zone Protection Method for Series Capacitor Bank

A technology of series capacitors and capacitor banks, which is applied in the direction of emergency protection circuit devices, electrical components, etc., to achieve the effects of eliminating action dead zones, high protection sensitivity, and reducing errors

Active Publication Date: 2015-08-19
ANHUI HUIDIAN SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Efforts to find a protection scheme so that the protection dead zone of the series capacitor bank is controlled within 3% and is not affected by the load current is a problem that must be solved to ensure the safe operation of the series capacitor bank, and it is also related to the high-voltage new series voltage compensation Whether the scientific research project of systematic research and development can be successfully completed

Method used

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  • No Dead Zone Protection Method for Series Capacitor Bank
  • No Dead Zone Protection Method for Series Capacitor Bank
  • No Dead Zone Protection Method for Series Capacitor Bank

Examples

Experimental program
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Effect test

Embodiment 1

[0025] See figure 2 , Figure 5 , the non-dead zone protection method of the series capacitor bank, the two parallel branches of the capacitor bank C 1 , C 2 The output terminals of both pass through a bridge differential current transformer CT Q , and the crossing direction is opposite, the output terminals of the two parallel branches are connected in series with the working current transformer CT G , working current transformer CT G Collect load current I G Then it is transmitted to the controller PLC. There is a voltage transformer PT connected in parallel between the input and output ends of the two parallel branches to collect the working voltage and then transmit it to the controller PLC. During normal operation, the shunts of the two parallel branches are equal. Current Transformer CT Q The magnetic potentials in are equal and opposite, and the bridge difference current transformer CT Q There is no current in the bridge differential current transformer CT when ...

Embodiment 2

[0027] See Figure 4 , Image 6 , the non-dead zone protection method of the series capacitor bank, the capacitors of the two parallel branches are divided into four groups, forming four bridge arms C 1 , C 2 , C 3 , C 4 , according to the H-type connection into a bridge connection, the bridge difference circuit is connected with a bridge difference current transformer CT G, the output terminals of the two parallel branches are connected in series with the working current transformer, and the working current transformer CT G Collect load current I G Then it is transmitted to the controller PLC. There is a sampling resistor R connected in parallel between the input and output ends of the two parallel branches to collect the working voltage and then transmit it to the controller PLC; due to the four bridge arms C 1 , C 2 , C 3 , C 4 The parameters are symmetrical, during normal operation, the bridge differential current transformer CT G There is no current in the middl...

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Abstract

The invention discloses a series capacitor bank no-dead-zone protection method. A working current mutual inductor is connected with output ends of two parallel branches. The working current mutual inductor collects a load current and transmits the load current to a controller. A ratio between an unbalanced current and the load current is defined as a bridge difference ratio. When the bridge difference ratio obtained through calculation of the controller exceeds a bridge difference ratio prewarning value, the controller gives an alarm. According to the series capacitor bank no-dead-zone protection method, a 'bridge difference ratio' protection formed by adoption of the ratio between the unbalanced current and the load current is used as a main protection of a series capacitor bank, motion dead zones are eliminated and the protection motion dead zones of the series capacitor bank are controlled to be less than 3% under any working conditions. Failure alarming dead zones of capacity of a single bridge arm capacitor can be controlled to be about 5% under any working conditions. The protection sensitivity is high and the series capacitor bank no-dead-zone protection method is not affected by the load current.

Description

technical field [0001] The invention relates to the field of power system planning and operation, in particular to a dead zone-free protection method for a capacitor bank connected in series. Background technique [0002] A capacitor bank is usually composed of multiple capacitors connected in series and parallel, and each capacitor is composed of multiple small units connected in parallel. When a fault occurs inside the capacitor, the built-in fuse connected in series with the small unit will quickly blow, cutting off the faulty part, while other intact parts can continue to work. [0003] Individual or a small number of faulty small units are cut off, and generally the capacity of the capacitor is not changed much, and the operation can still continue. However, when the number of small units cut off due to internal faults in the capacitor increases to a certain extent, it will have a significant impact on the capacity of the capacitor and should be replaced as soon as pos...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/16
Inventor 王川张国勇彭道平
Owner ANHUI HUIDIAN SCI & TECH