Method for judging single-phase earth fault of controllable high-voltage shunt reactor

Method for judging single-phase earth fault of controllable high-voltage shunt reactor

The invention relates to a method for judging single-phase earth fault of a controllable high-voltage shunt reactor. The method comprises the following steps: 1) arranging current transformers 1LH and 2LH at the left side and the right side of a low-voltage side earthing point of each phase of the c...

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Hauptverfasser: YAO QINGLIN, LI RUISHENG, SU XIAOHUA, CAO LILU, ZHANG XIANGAN
Format: Patent
Sprache:chi ; eng
Schlagworte:
CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
ELECTRICITY
EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
GENERATION
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creator YAO QINGLIN
LI RUISHENG
SU XIAOHUA
CAO LILU
ZHANG XIANGAN
description The invention relates to a method for judging single-phase earth fault of a controllable high-voltage shunt reactor. The method comprises the following steps: 1) arranging current transformers 1LH and 2LH at the left side and the right side of a low-voltage side earthing point of each phase of the controllable high-voltage shunt reactor respectively; and 2) fetching phase current from the current transformers 1LH and 2LH to form split differential protection for reflecting three-phase ratio restraint of the phase current, wherein the split differential protection is used as main protection for single-phase earth faults of a low-voltage winding of the controllable high-voltage shunt reactor and a hollow reactor, the differential current Iop of the main protection is an absolute value of *1LH+*2LH, and the braking current Ires is equal to 1/2 absolute value of *1LH-*2LH. When any point in the low-voltage winding or the hollow reactor is earthed in single phase, the Iop is equal to total current flowing to the e
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subjects CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
ELECTRICITY
EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
GENERATION
title Method for judging single-phase earth fault of controllable high-voltage shunt reactor
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