三繞組變壓器差動電流計算與差動保護新技術(shù)
羅璐1,謝蕓1,譚正奎2
(1 昆明鐵道職業(yè)技術(shù)學(xué)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(diào)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(chǎn)生差流,并觸發(fā)差動保護相關(guān)告警,威脅電網(wǎng)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(jù),介紹了故障排查步驟,并以現(xiàn)場保護二次電流記錄為基礎(chǔ),探討了三繞組變壓器差動電流大小計算方法,采用工作現(xiàn)場數(shù)據(jù)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(yù)防措施。
關(guān)鍵詞:變壓器差動保護;三繞組變壓器;變壓器調(diào)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
參考文獻
[1] 譚雨珍,程本良,孫世磊,等. 主變壓器差動保護誤動故障實例分析[J]. 山東電力技術(shù),2016,43(12):42-45.
[2] 李智. 自耦變壓器差動保護動作原因分析及判斷[J]. 電氣化鐵道,2018(4):79-83.
[3] 程強,賈景東,李社勇. 一起220 kV變壓器差動保護誤動事故分析[J]. 山西電力,2017(2):5-8.
[4] 孟建英,荀華,郭紅兵. 變壓器差動保護動作原因分析[J]. 內(nèi)蒙古電力技術(shù),2017,35(1):95-100.
[5] 羅璐,張春剛. 無功功率就地補償對變壓器調(diào)檔過程的影響分析[J]. 電氣技術(shù),2019,20(4):86-90.
[6] 寧鐸,尤磊,李英春,等. 變壓器差動保護動作特性的仿真研究[J]. 電力系統(tǒng)保護與控制,2017,45(4):99-106.
[7] 姚東曉,張凱,賀要鋒,等. 變壓器多特征勵磁涌流識別方案研究[J]. 電力系統(tǒng)保護與控制,2017,45(13):149-154.
[8] 蘭生,張小釩. 基于多判據(jù)的變壓器差動保護方法[J]. 電力系統(tǒng)保護與控制,2015,43(23):125-131.
[9] 翁漢琍,王勝,林湘寧,等. 基于波形相似度的抗電流互感器飽和變壓器相位差動保護[J]. 電力系統(tǒng)自動化,2019,43(4):132-138.
[10] 黃婷,鄭濤,陸格野,等. 變壓器差動保護的P 級電流互感器“同型”匹配方法[J]. 電力自動化設(shè)備,2017,37(7):213-219.
[11] 金瑞,鮑斌,時伯年. 變壓器差動保護的三種比率制動方式及其系數(shù)整定的研究[J]. 電力系統(tǒng)保護與控制,2018,46(19):81-87.
[12] 鄭濤,陸格野,黃婷,等. 特高壓有載調(diào)壓變壓器差動保護自適應(yīng)算法[J]. 電工技術(shù)學(xué)報,2017,32(20):271-280.
[13] 曾杰,張祿亮,吳青華. 基于形態(tài)學(xué)骨架的變壓器差動保護[J]. 電力系統(tǒng)自動化,2017,41(23):68-76.
[14] 陸明,薛磊,余江,等. 變壓器零序差動保護的分析和改進[J]. 南方電網(wǎng)技術(shù),2018,12(10):35-40.
[15] 王雪,王增平. 變壓器電壓差動保護方法研究[J].電力系統(tǒng)保護與控制,2013,41(4):67-72.