某35 kV開關柜局部放電及受潮的原因分析
林根德,陳達,黃繼來,葉隆,張海龍,鄭娟娟
(國網(wǎng)浙江省電力公司溫州供電公司,浙江 溫州 325000)
摘 要:針對某開關柜運行中多個間隔局部放電數(shù)值超標的現(xiàn)象,對開關柜內(nèi)設備進行停電檢查及絕緣性能試驗,分析了開關柜自身結構及其運行環(huán)境中存在的薄弱因素,建立了開關柜受潮過程的模型,研究了設備絕緣性能下降的機理,并提出了更換老化、受潮絕緣件,在開關柜內(nèi)安裝加熱器、除濕機,增強電纜溝防水性及電纜孔洞密封性等改進措施。經(jīng)過一年的跟蹤監(jiān)測,開關室內(nèi)的濕度保持在50% 左右,開關柜內(nèi)的濕度保持在48% 左右,未發(fā)現(xiàn)開關柜內(nèi)設備局部放電及受潮、老化現(xiàn)象,設備絕緣性能良好。
關鍵詞:開關柜;局部放電;受潮;絕緣性能
中圖分類號:TM591 文獻標識碼:B 文章編號:1007-3175(2017)08-0039-04
Causes Analysis of Partial Discharge and Damp for Certain 35 kV Switchgear
LIN Gen-de, CHEN Da, HUANG Ji-lai, YE Long, ZHANG Hai-long, ZHENG Juan-juan
(State Grid Zhejiang Whenzhou Electric Power Company, Wenzhou 325000, China)
Abstract: In allusion to the overproof standard phenomenon of multi-interval partial discharge, the equipment inside the switchgear was carried out the power-off examination and insulating property test. This paper analyzed the weakness factors existing in the structure of switchgear itself and its operating environment, established the model of switchgear damp process and studied the mechanism of insulating property degradation. This paper proposed the improvement measures, such as changing aging and damp insulating parts, installing heaters and dehumidifiers, enhancing cable ducts waterproofness and cable void leakproofness etc. after one year’s tracking monitoring, it is found that the humidity inside switch rooms keeps about 50%, the humidity inside switchgear keeps about 48% and the equipment inside the switchgear has no partial discharge, damp and aging, with good insulating property.
Key words: switchgear; partial discharge; damp; insulating property
參考文獻
[1] 李軍浩,韓旭濤,劉澤輝,等. 電氣設備局部放電檢測技術述評[J]. 高電壓技術,2015,41(8):2583-2601.
[2] 戴罕奇,趙晨龍,徐冰,等. 染污復合絕緣子受潮過程研究[J]. 電網(wǎng)技術,2016,40(7):2227-2235.
[3] 黃世龍,王曉輝,郭旭敏,等. 采用TEV傳感器的開關柜局部放電檢測技術研究與實現(xiàn)[J]. 高壓電器,2016,52(10):19-26.
[4] 馮波,肖代波,李毅,等. 暫態(tài)對地電壓和超聲法用于開關柜不同濕度PD檢測研究[J]. 高壓電器,2015,51(4):67-71.
[5] 鄧雨榮,田樹軍,李銳鵬,等. 一種改進的10 kV開關柜局部放電TEV檢測及定位技術[J]. 絕緣材料,2014,47(2):93-96.
[6] 丁然,田野,任紅向,等. 氣隙局部放電模型改進及仿真[J]. 高電壓技術,2016,42(12):3934-3940.
[7] 潘瑾,李曉峰,龐先海,等. 基于暫態(tài)對地電壓法和超聲波檢測法的開關柜局放實驗研究[J]. 電網(wǎng)技術,2014,38(s2):179-181.
[8] 高波,包健康,鐘鑫,等. 沿面放電時環(huán)氧樹脂車頂絕緣子的溫度分布及耐電痕分析[J]. 高電壓技術,2016,42(11):3576-3584.
[9] 葉海峰,錢勇,王紅斌,等. 開關柜表面暫態(tài)地電壓信號頻譜特征[J]. 高電壓技術,2015,41(11):3849-3857.
[10] 吳吉,呂鴻,王流火,等. 開關柜局部放電暫態(tài)地電波(TEV) 傳播特性的實驗研究[J]. 高壓電器,2014,50(11):115-121.
[11] 嵇麗明,邱崑,徐翀,等. 開關柜局部放電綜合診斷技術的應用研究[J]. 高壓電器,2014,50(7):106-110.