不同接線方式下變壓器差動CT極性檢測研究
馬迎東1，王文棟2，許永強1，焦立波1，郭良基1
（1 神華福能發電有限責任公司，福建 泉州 362000；2 神華福建（龍巖/雁石）發電有限責任公司，福建 龍巖 364000）
摘 要：CT極性一旦錯誤將會導致設備非故障停運。以廠用電受電為背景，將啟備變差動CT極性分高壓側空載沖擊檢查及低壓側小負載檢查兩部分，以判別整套差動保護CT極性的正確性，并根據保護裝置0°和180°不同接線方式分析，給出兩種不同接線方式判別方法。根據工程實際，利用現場保護裝置特有靈活邏輯搭建變壓器高壓側CT極性檢測及變壓器差動CT 極性檢測方法，提高了該理論的實操性。
關鍵詞：變壓器差動保護；勵磁涌流；CT 極性；無功功率；有功功率
中圖分類號：TM403.5 文獻標識碼：A 文章編號：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
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