330 kV倒置式電流互感器噴油事故分析及預(yù)防措施
劉威峰，閆振華，周秀，馬云龍，李奇超，徐玉華
（國(guó)網(wǎng)寧夏電力有限公司電力科學(xué)研究院，寧夏 銀川 750011）
摘 要：針對(duì)一起倒置式電流互感器的噴油事故，分析了互感器的結(jié)構(gòu)及絕緣特點(diǎn)，綜合三比值法、特征氣體組分、大衛(wèi)三角形法對(duì)試驗(yàn)數(shù)據(jù)進(jìn)行判斷，并結(jié)合解體檢查認(rèn)為造成此類故障的原因：一是主絕緣制造工藝不良，絕緣包裹過(guò)程包扎不均勻，極易引起局部電場(chǎng)不均勻、局部發(fā)熱；二是安裝工藝不良引起密封不嚴(yán)所致，極易引起絕緣內(nèi)部受潮。上述缺陷會(huì)引起絕緣油劣化分解產(chǎn)生大量氣體，嚴(yán)重者導(dǎo)致頭部金屬膨脹器冒頂、噴油甚至爆炸事故，給出了相關(guān)處理措施，避免此類故障再次發(fā)生。
關(guān)鍵詞：倒置式電流互感器；膨脹器；油中溶解氣體；絕緣油
中圖分類號(hào)：TM452 文獻(xiàn)標(biāo)識(shí)碼：B 文章編號(hào)：1007-3175(2020)02-0058-04
Analysis and Preventive Measures of 330 kV Inverted Current Transformer Oil Injection Accident
LIU Wei-feng, YAN Zhen-hua, ZHOU Xiu, MA Yun-long, LI Qi-chao, XU Yu-hua
（State Grid Ningxia Electric Power Company Electric Power Research Institute, Yinchuan 750011 , China）
Abstract: Aiming at an oil injection accident of inverted current transformer, this paper analyzed the structure and insulation characteristics, synthesized three-ratio method, characteristic gas component method and David triangle method to carry out judgments for testing data, and combined strip inspection to conclude this type of faults causes: on the one hand, major insulation manufacturing technique badness and insulation-wrapping process bind-up asymmetry are easy to cause the partial electric field asymmetry and local heating, on the other hand, the installation technology badness causes untight seal, easy to cause insulation interior damp. The above mentioned defects will cause the insulation oil degradation decompose to generate a large amount of gas, which may cause the head metal expander collapse, the oil injection or even the explosion accident. This paper gave the relevant treatment measure to avoid this type of faults happening again.
Key words: inverted current transformer; expander; dissolved gas in oil; insulating oil
參考文獻(xiàn)
[1] 顧文雯，柯于剛.220 kV 倒置式電流互感器金屬膨脹器噴油分析及措施[J]. 電工電氣，2017(11)：56-58.
[2] 國(guó)家電網(wǎng)公司運(yùn)維檢修部. 電網(wǎng)設(shè)備帶電檢測(cè)技術(shù)[M]. 北京：中國(guó)電力出版社，2014.
[3] 錢國(guó)超，鄒德旭，馬儀，等. 倒立電流互感器典型缺陷及制造關(guān)鍵工藝分析[J]. 電力電容器與無(wú)功補(bǔ)償，2015，36(2)：73-77.
[4] 馬曉薇，樊培培，華超.500 kV油浸倒立式電流互感器故障實(shí)例及分析[J]. 電力電容器與無(wú)功補(bǔ)償，2018，39(6)：91-94.
[5] 中國(guó)電力企業(yè)聯(lián)合會(huì). 現(xiàn)場(chǎng)絕緣試驗(yàn)實(shí)施導(dǎo)則 介質(zhì)損耗因數(shù)tanδ試驗(yàn)：DL/T 474.3—2006[S]. 北京：中國(guó)電力出版社：8-9.
[6] 中國(guó)電力企業(yè)聯(lián)合會(huì). 變壓器油中溶解氣體分析和判斷導(dǎo)則：DL/T 722—2014[S]. 北京：中國(guó)電力出版社：6-12.
[7] 董均宇，鄒德旭，周駿，等.110 kV倒置少油電流互感器金屬膨脹器含氫拉伸故障[J]. 云南電力技術(shù)，2014，42(S1)：31-32.
