不同接線方式下變壓器差動(dòng)CT極性檢測研究
馬迎東1，王文棟2，許永強(qiáng)1，焦立波1，郭良基1
（1 神華福能發(fā)電有限責(zé)任公司，福建 泉州 362000；2 神華福建（龍巖/雁石）發(fā)電有限責(zé)任公司，福建 龍巖 364000）
摘 要：CT極性一旦錯(cuò)誤將會(huì)導(dǎo)致設(shè)備非故障停運(yùn)。以廠用電受電為背景，將啟備變差動(dòng)CT極性分高壓側(cè)空載沖擊檢查及低壓側(cè)小負(fù)載檢查兩部分，以判別整套差動(dòng)保護(hù)CT極性的正確性，并根據(jù)保護(hù)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(jù)工程實(shí)際，利用現(xiàn)場保護(hù)裝置特有靈活邏輯搭建變壓器高壓側(cè)CT極性檢測及變壓器差動(dòng)CT 極性檢測方法，提高了該理論的實(shí)操性。
關(guān)鍵詞：變壓器差動(dòng)保護(hù)；勵(lì)磁涌流；CT 極性；無功功率；有功功率
中圖分類號：TM403.5 文獻(xiàn)標(biāo)識(shí)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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