广东电力
廣東電力
엄동전력
GUANGDONG ELECTRIC POWER
2015年
2期
82-87
,共6页
黄颖%唐波%余占清%曾嵘%覃煜%李宁智
黃穎%唐波%餘佔清%曾嶸%覃煜%李寧智
황영%당파%여점청%증영%담욱%리저지
变压器中性点%雷击过电压%线饼模型%放电间隙%氧化锌避雷器
變壓器中性點%雷擊過電壓%線餅模型%放電間隙%氧化鋅避雷器
변압기중성점%뢰격과전압%선병모형%방전간극%양화자피뢰기
transformer neutral point%lightning over-voltage%line cake model%discharge gap%zinc oxide arrester
为获得雷电流冲击下110 kV变压器不接地中性点上的过电压,采用线饼模型对110 kV 变压器绕组进行建模,并用 PSCAD仿真软件对该模型进行仿真计算。利用该模型对广州地区110 kV 变压器中性点击穿事故进行仿真分析,结果表明对变压器中性点仅加装放电间隙不足以防止雷电侵害,并且雷电波入侵变压器时中性点故障率高达到0.686次/年,说明需要结合其他防护措施对这一地区变压器中性点进行保护。根据仿真结果提出采用130 mm的间隙并联Y1.5W-72/186避雷器实施改造措施。
為穫得雷電流遲擊下110 kV變壓器不接地中性點上的過電壓,採用線餅模型對110 kV 變壓器繞組進行建模,併用 PSCAD倣真軟件對該模型進行倣真計算。利用該模型對廣州地區110 kV 變壓器中性點擊穿事故進行倣真分析,結果錶明對變壓器中性點僅加裝放電間隙不足以防止雷電侵害,併且雷電波入侵變壓器時中性點故障率高達到0.686次/年,說明需要結閤其他防護措施對這一地區變壓器中性點進行保護。根據倣真結果提齣採用130 mm的間隙併聯Y1.5W-72/186避雷器實施改造措施。
위획득뇌전류충격하110 kV변압기불접지중성점상적과전압,채용선병모형대110 kV 변압기요조진행건모,병용 PSCAD방진연건대해모형진행방진계산。이용해모형대엄주지구110 kV 변압기중성점격천사고진행방진분석,결과표명대변압기중성점부가장방전간극불족이방지뇌전침해,병차뇌전파입침변압기시중성점고장솔고체도0.686차/년,설명수요결합기타방호조시대저일지구변압기중성점진행보호。근거방진결과제출채용130 mm적간극병련Y1.5W-72/186피뢰기실시개조조시。
In order to work out over-voltage on insulated neutral point of 1 1 0 kV transformer under lightning current impact, line cake model was used for modeling for 1 1 0 kV transformer winding and PSCAD software was adopted for simulating cal-culation on this model. Simulating analysis was carried out for breakdown of 1 1 0 kV transformer neutral point in Guangzhou region by using this model and the result indicates that it is not enough to prevent lightning by only installing discharge gap for transformer neutral point and the fault rate of neutral point reaches up to 0.686 times a year when lightning wave inva-ding the transformer which explains that it needs to combine other control measures for protection on the transformer neu-tral point in this region. According to simulation result,transformation measure of using 130 mm gap in parallel connection with Y1.5 W-72/1 86 typed arrester is proposed.