电力系统自动化Issue(14)：122-125,4.DOI:10.7500/AEPS20131124003
负荷变压器差动速断保护区外故障误动原因分析及对策
Analysis and Countermeasures of External Fault Maloperation for Load Transformer Differential Instantaneous Protection
周昊程 1陆广香 1周建新 2沈文英2
作者信息
- 1. 东南大学电气工程学院，江苏省南京市 210096
- 2. 南京南瑞继保电气有限公司，江苏省南京市 211102
- 折叠
摘要
Abstract
Differential instantaneous protection sets for fast fault clearing when serious fault happens inside a transformer and the general percentage differential protection may be no longer in force.Differential instantaneous protection maloperation is a big problem in actual engineering application.This maloperation is caused by low-pressure side current transformer saturation which happens in a load transformer such as the high-voltage house service operating transformer.For a case of external fault maloperation of differential instantaneous protection for high-voltage house service operating transformer,it is based on an analysis of the saturation characteristics of the current transformer to research the causes of differential relay maloperation. Countermeasures have been proposed to solve maloperation of differential instantaneous protection by using differential instantaneous protection made up of power frequency differential relays.Moreover,this maloperation is caused by low-pressure side current transformer saturation with high-voltage house service operating transformer and load transformer of direct distribution line.关键词
工频量差动速断保护/剩磁/电流互感器饱和/高压厂用变压器/负荷变压器Key words
power frequency differential instantaneous protection/remanence/saturation of current transformer/high-voltage house service operating transformer/load transformer引用本文复制引用
周昊程,陆广香,周建新,沈文英..负荷变压器差动速断保护区外故障误动原因分析及对策[J].电力系统自动化,2014,(14):122-125,4.
