三繞組變壓器差動電流計算與差動保護新技術
羅璐1,謝蕓1,譚正奎2
(1 昆明鐵道職業(yè)技術學院,云南 昆明 650208;2 中國鐵路昆明局集團有限公司昆明供電段,云南 昆明 650208)
摘 要:變壓器調擋過程中往往由于差動保護定值整定時的變壓器擋位與實際運行擋位不一致產生差流,并觸發(fā)差動保護相關告警,威脅電網穩(wěn)定運行。以一起某110 kV變電站三繞組變壓器差動保護CT報警缺陷處理實例為依據,介紹了故障排查步驟,并以現場保護二次電流記錄為基礎,探討了三繞組變壓器差動電流大小計算方法,采用工作現場數據計算變壓器差動保護告警時的差流大小,為類似事件的計算分析提供參考,并提出預防措施。
關鍵詞:變壓器差動保護;三繞組變壓器;變壓器調擋;CT 報警
中圖分類號:TM423 文獻標識碼:A 文章編號:1007-3175(2020)05-0043-04
Calculation of Three-Winding Transformer Differential Current and New Differential Protection Technology
LUO Lu1, XIE Yun1, TAN Zheng-kui2
(1 Kunming Railway Vocational Technical College, Kunming 650208, China;
2 Kunming Section for Power Supply of China Railway Kunming Group Co., Ltd, Kunming 650208, China)
Abstract: In the process of shifting gears of transformer, differential current is often caused by the inconsistency between the gear at the differential protection value setting of the transformer and the gear in the actual operation of the transformer, with differential protection alarm triggered, which will threaten the stable operation of power grid. In an example of CT alarm defect treatment of differential protection of three-winding transformer in a 110 kV substation, this paper introduced the troubleshooting steps, and discussed the calculation method of differential current of three-winding transformer based on the records of secondary current in field protection, where the field data was used to calculate the differential current when transformer differential protection alarm was triggered, so as to provide references for the calculation and analysis of similar events as well as the preventive measures.
Key words: transformer differential protection; three-winding transformer; transformer gear shifting; CT alarm
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