电网技术2017，Vol.41Issue(6)：2020-2026,7.DOI:10.13335/j.1000-3673.pst.2016.2219
基于变压器电流直流分量衰减特性的励磁涌流识别方法
A Novel Inrush Current Distinguishing Scheme Based on DC Component Decaying Characteristics of Transformer Current
摘要
Abstract
In order to distinguish inrush current and fault current effectively to ensure reliability of transformer protection, based on difference of DC component decaying characteristics between magnetizing inrush current and fault current, this paper proposes a novel magnetizing inrush currents distinguishing scheme, using export circuit breaker current of transformer as detection signal to identify inrush current and fault current by setting decay rate of DC component and fundamental component amplitude ratio as a logical criterion. This paper analyzes above-mentioned difference and influences of system short-circuit capacity, transformer rated capacity, core remanence and other factors. Through typical simulation and field data verification, the inrush current distinguishing method is proved effective and reliable, suitable to case of circuit breaker without closing resistor installed. This scheme possesses advantages of clear principle, less necessary data, easy implement and promising engineering applications.关键词
变压器/励磁涌流/短路电流/直流分量/衰减特性/识别方法Key words
transformer/magnetizing inrush current/fault current/DC component/decay characteristic/distinguishing method分类
信息技术与安全科学引用本文复制引用
郑彬,滕文涛,项祖涛,邓帅荣,周佩朋,李岩军,班连庚,詹花茂..基于变压器电流直流分量衰减特性的励磁涌流识别方法[J].电网技术,2017,41(6):2020-2026,7.基金项目
国家电网公司科技项目(SGNX0000DKJS1500066). Project Supported by Science and Technology Foundation of State Grid Corporation of China (SGNX0000DKJS1500066). （SGNX0000DKJS1500066）
