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| 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 |
| DOI： |
| 分类号:TM773 |
| 基金项目: |
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| Influence of transformer inrush on zero-sequence current protection |
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FANG Yudong XU Xidong ZHU Bingquan
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| 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. |
| Key words: transformer,inrush current,simulative analysis,zero -sequence current protection |
