某500 kV變電站換流變閥側(cè)電壓互感器故障機(jī)理分析
吳繼平,鄭毅,季斌,章憶萌
(常州博瑞電力自動(dòng)化設(shè)備有限公司, 江蘇 常州 213025)
摘 要:某500 kV變電站融冰兼靜止無(wú)功補(bǔ)償裝置(SVC)用換流變閥側(cè)電壓互感器(PT)發(fā)生故障,基于故障PT 的解剖試驗(yàn)及系統(tǒng)運(yùn)行情況的仿真數(shù)據(jù),對(duì)PT 的故障機(jī)理進(jìn)行了分析,產(chǎn)生原因是由于大量的諧波及直流偏置分量,導(dǎo)致PT二次繞組絕緣損壞過熱故障。提出通過加裝濾波及直流偏置裝置或改變PT的接線方式以及提高PT自身的絕緣水平、局部放電水平等措施來(lái)抑制故障的發(fā)生。
關(guān)鍵詞:電壓互感器;融冰;靜止無(wú)功補(bǔ)償裝置;諧波;解剖試驗(yàn);故障機(jī)理
中圖分類號(hào):TM451 文獻(xiàn)標(biāo)識(shí)碼:B 文章編號(hào):1007-3175(2019)04-0035-04
Analysis of PT Failure Mechanism at Transformer Valve Side of Certain 500 kV Substation
WU Ji-ping, ZHENG Yi, JI Bin, ZHANG Yi-meng
(NR Electric Power Electronics Co., Ltd, Changzhou 213025, China)
Abstract: The PT at transformer valve side of certain 500 kV substation used in melting ice and static var compensator was out of order. Based on the simulation data of fault PT dissection test and system operation situation, this paper analyzed the PT failure mechanism. Almost all of the PT failures were caused by a good deal of harmonics and DC bias components, which led to the PT secondary winding insulation damage overheating. This paper proposes that the smoothing and DC bias device should be added to suppress those faults, or else change the PT connection mode, improve the PT self insulation level and partial discharge level etc measures.
Key words: PT; melting ice; static var compensator; harmonic; dissection test; failure mechanism
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