不同接线方式下变压器差动CT极性检测研究
马迎东1，王文栋2，许永强1，焦立波1，郭良基1
（1 神华福能发电有限责任公司，福建 泉州 362000；2 神华福建（龙岩/雁石）发电有限责任公司，福建 龙岩 364000）
摘 要：CT极性一旦错误将会导致设备非故障停运。以厂用电受电为背景，将启备变差动CT极性分高压侧空载冲击检查及低压侧小负载检查两部分，以判别整套差动保护CT极性的正确性，并根据保护装置0°和180°不同接线方式分析，给出两种不同接线方式判别方法。根据工程实际，利用现场保护装置特有灵活逻辑搭建变压器高压侧CT极性检测及变压器差动CT 极性检测方法，提高了该理论的实操性。
关键词：变压器差动保护；励磁涌流；CT 极性；无功功率；有功功率
中图分类号：TM403.5 文献标识码：A 文章编号：1007-3175(2019)12-0050-03
Research on Polarity Detection of Transformer Differential CT under Different Connection Mode
MA Ying-dong1, WANG Wen-dong2, XU Yong-qiang1, JIAO Li-bo1, GUO Liang-ji1
（1 Shenhua Funeng Power Generation Co., Ltd, Quanzhou 362000, China;
2 Shenhua Fujian (Longyan/Yanshi) Power Generation Co., Ltd, Longyan 364000, China）
Abstract: Whether the polarity of CT is correct or not will lead to the non-fault outage of equipment. Based on the background of auxiliary power supply, the polarity of start-up and standby differential CT was divided into two parts, including the high-voltage side impact test and the low-voltage side small load test, so as to judge the correctness of the polarity of the whole set of differential protection CT, also according to the analysis of different connection modes of protection device degree 0 and 180, two different connection discriminated methods were given. According to the engineering practice, the specific flexible logic of onsite protective device was used to create the transformer high-voltage side and differential CT polarity detection method to improve the practical operability of this theory.
Key words: transformer differential protection; inrush current; CT polarity; reactive power; active power
参考文献
[1] 唐海燕. 主变倒送电带负荷校验方案及试验分析[J]. 电工电气，2019(2)：52-55.
[2] 李本瑜，宋晓亮，王冰清，等. 主变CT极性和方向保护自适应校验技术研究[J]. 自动化与仪器仪表，2019(5)：171-174.
[3] 李本瑜，陈海龙，刘志文，等. 大型发变组保护CT极性及保护方向自动检测技术研究[J]. 电测与仪表，2018，55(14)：100-105.
[4] 宋梦琼. 发变组变压器零序差动保护电流互感器极性校验分析[J]. 武汉电力职业技术学院学报，2018，16(4)：47-49.
