一起220 kV主變壓器輕瓦斯保護(hù)動(dòng)作原因分析及處理
鄭偉欽，何勝紅，徐朋江，金向朝，張勇，鐘煒
(廣東電網(wǎng)有限責(zé)任公司佛山供電局，廣東 佛山 528000)
摘 要：介紹了某 220 kV 主變壓器氣體繼電器輕瓦斯保護(hù)動(dòng)作的經(jīng)過，利用變壓器油色譜分析技術(shù)和電氣試驗(yàn)對主變壓器進(jìn)行診斷，結(jié)合現(xiàn)場解體檢查確認(rèn)氣體繼電器輕瓦斯保護(hù)動(dòng)作原因，是由于變壓器內(nèi)部磁屏蔽焊接部位過熱熔化形成金屬雜質(zhì)，在油流的作用下附著在變壓器鐵芯表面和鐵芯絕緣油道內(nèi)部，造成鐵芯多點(diǎn)接地形成較大環(huán)流而產(chǎn)生大量熱量，導(dǎo)致變壓器油色譜分析數(shù)據(jù)異常，變壓器油中氣體含量不斷累積，使得油流達(dá)到氣體繼電器輕瓦斯保護(hù)動(dòng)作值造成輕瓦斯動(dòng)作。經(jīng)過采取有效處理措施后，設(shè)備運(yùn)行正常。
關(guān)鍵詞：變壓器；輕瓦斯保護(hù)；油色譜分析
中圖分類號：TM403.5 ；TM411 文獻(xiàn)標(biāo)識碼：B 文章編號：1007-3175(2021)10-0035-04
Analysis and Treatment of the Light Gas Relay Protection
Operation of a 220 kV Transformer
ZHENG Wei-qin, HE Sheng-hong, XU Peng-jiang, JIN Xiang-chao, ZHANG Yong, ZHONG Wei
（Foshan Power Supply Bureau of Guangdong Power Grid Co., Ltd, Foshan 528000, China）
Abstract: In this paper, the operation process of a light gas relay protection of a 220 kV transformer is introduced. Chromatographic analysis and electrical tests are performed to diagnose the transformer, with the on-the-spot disassembly, the reason of the light gas protection operation is found out, that is, the weld region of the magnetic shielding inside the transformer melted down at overheating meanwhile generated some metal impurity which adhered to the core and the channel of insulating oil by the oil flow. That metal impurity caused the core multipoint earthing with big loop current, and the resulting humorous heat led to abnormal data of the chromatographic analysis. As a result,the accrued gas in the transformer oil made oil flow over the operation value of light gas relay protection and finally caused the operation. In the end, the equipment operates normally after corresponding effective treatments.
Key words: transformer; light gas relay protection; oil chromatographic analysis
參考文獻(xiàn)
[1] 鐘天翔，金樹軍.500 kV 變壓器瓦斯繼電器誤動(dòng)作原因分析[J]. 高壓電器，2011，47(5) ：79-82.
[2] 國家能源局. 變壓器油中溶解氣體分析和判斷導(dǎo)則：DL/T 722—2014[S] . 北京：中國電力出版社，2014 ：11.
[3] 國家能源局. 電力變壓器檢修導(dǎo)則：DL/T 573—2010[S]. 北京：中國電力出版社，2010 ：4-13.
[4] 王天施，王清昊，候?qū)毭鳎? 一起 220 kV 變壓器鐵心故障的判斷與分析[J] . 高壓電器，2013，49(4) ：119-127.
[5] 韓彥華，遲清，吳經(jīng)鋒，等.750 kV 變壓器油色譜超標(biāo)問題分析[J]. 變壓器，2018，55(3) ：46-49.
[6] 賈仰楨. 變壓器鐵心多點(diǎn)接地故障的分析判斷與消除[J]. 變壓器，2007，44(11) ：42-44.
[7] 韓波. 磁屏蔽放電引起的變壓器乙炔含量超標(biāo)故障分析及處理[J]. 變壓器，2014，51(2) ：76-77.
