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变压器涌流对零序电流保护的影响分析
引用本文:方愉冬,徐习东,朱炳铨.变压器涌流对零序电流保护的影响分析[J].电力自动化设备,2008,28(9).
作者姓名:方愉冬  徐习东  朱炳铨
作者单位:1. 浙江电力调度通信中心,浙江,杭州,310007
2. 浙江大学,电气工程学院,浙江,杭州,310027
摘    要:采用ATP仿真计算与实际分析相结合的方法,分析了单台变压器励磁涌流最大零序分量,以及多台变压器涌流零序分量与主变中性点接地方式的关系,得出:剩磁越大,通过调整合闸角所能取得的涌流零序分量越大,当实际最大剩磁为0.7Bm时,涌流零序分量最大可到0.95IN;多台变压器涌流零序分量与中性点接地变压器台数成正比.结合220 kV零序电流保护整定原则,分析了涌流零序分量对220 kV零序电流保护的影响,得出它对主变零序电流保护和线路零序电流Ⅰ、Ⅱ、Ⅳ段没有影响,对线路零序电流Ⅲ段和母联保护有不利影响,并提出了运行和整定时需采取的相应措施.

关 键 词:变压器  励磁涌流:仿真分析  零序电流保护

Influence of transformer inrush on zero-sequence current protection
FANG Yudong,XU Xidong,ZHU Bingquan.Influence of transformer inrush on zero-sequence current protection[J].Electric Power Automation Equipment,2008,28(9).
Authors:FANG Yudong  XU Xidong  ZHU Bingquan
Abstract:With ATP simulative calculation and practical analysis,the maximum zero -sequence inrush current of single transformer,as well as the relationship between the zero -sequence inrush current of multiple transformers and the neutral point grounding mode of main transformer,is analyzed. The conclusions are that,the more the residual flux is,the greater the zero-sequence inrush current obtained by switching angle adjustment will be:when the actual maximum residual flux is 0.7 Bm,the maximum zero -sequence inrush current will be 0.95 I N;the zero -sequence inrush current of multiple transformers is proportional to the number of neutral point grounded transformers. Combined with the setting principle of 220 kV zero -sequence current protection,the influence of zero -sequence inrush current on it is analyzed. The zero -sequence inrush current has no influence on zero -sequence current protection of main transformer and on Zone 1,2 and 4 of line zero -sequence current protection,but has bad influence on Zone 3 of line zero -sequence current protection and bus -link protection. The corresponding measures are put forward for their operation and setting.
Keywords:transformer  inrush current  simulative analysis  zero -sequence current protection
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