| 引用本文: | 黄少锋,李 欧,费 彬,申洪明.开口三角绕组任意连接的电压互感器断线闭锁新方法[J].电力自动化设备,2015,35(7): |
| HUANG Shaofeng,LI Ou,FEI Bin,SHEN Hongming.Wire-break blocking for PT connected arbitrarily with open delta winding[J].Electric Power Automation Equipment,2015,35(7): |
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| 摘要: |
| 现有电压互感器（TV）断线闭锁措施没有考虑系统发生故障时TV断线的情况，因此在智能电网信息共享的大背景下，针对开口三角绕组任意连接的TV，提出短路故障时利用开口三角电压与电压互感器二次侧自产零序电压的关系对电压互感器的断线情况进行识别。对所提方法的识别盲区提出了解决方法。分析结果表明结合选相元件，所提方法能够在线路故障的情况下发生TV断线时对相关保护进行有效闭锁。在系统发生接地故障且没有发生TV断线的情况下，可利用故障报告预先判断接线极性，简化后续的TV断线识别过程。 |
| 关键词: 电压互感器 断线 开口三角电压 故障 闭锁 选相 继电保护 |
| DOI： |
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| 基金项目:国家重点基础研究发展计划（973计划）资助项目（2012CB215206） |
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| Wire-break blocking for PT connected arbitrarily with open delta winding |
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HUANG Shaofeng, LI Ou, FEI Bin, SHEN Hongming
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State Key Laboratory of New Energy Power System，North China Electric Power University，Beijing 102206，China
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| Abstract: |
| The existing measures of PT（Potential Transformer） wire-break blocking do not consider its conditions during system faults，aiming at which，it is proposed to identify the wire-break conditions of the PT connected arbitrarily with open delta winding during the short-circuit fault according to the relationship between the open delta voltage and the zero-sequence voltage in the background of smart grid information sharing. Solutions to the blind zone of the proposed method are proposed. Analytical results indicate that，combined with the phase selecting element，the proposed method effectively blocks the corresponding relay protections when PT wire-break occurs during line fault. After the grounding fault of system without PT wire-break，the fault report can be used to recognize the winding polarity for simplifying the identification of PT wire-break conditions later on. |
| Key words: potential transformer wire-break open delta voltage fault blocking phase selecting relay protection |
