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PPT | 开关柜受潮放电情况及整治方法
2026-05-12 03:41:41
PPT | 开关柜受潮放电情况及整治方法
BEAUTIFUL
01
核心速览
本文主要围绕某电网35kV开关柜受潮放电问题展开,分析了设备运行现状、主要厂家产品情况、放电原因,并提出了相应的整治措施。
02
设备运行评述
设备规模
截至2014年2月初,某电网公司13个地市供电局共697面35kV高压开关柜在运,分布于52座110kV变电站和44座35kV变电站。
设备类型
移开式(KYN)585面,占84%;固定式(XGN)111面,占16%;GG1A型仅1面。
厂家分布
国产开关柜658面,占94%;合资开关柜39面,占6%,主要来自厦门ABB、施耐德和东芝白云。投运数量最大的制造厂家是某必达,其次为某金晖隆、许继电气、广州白云电器、湖南开关有限责任公司、陕西立元、常州太平洋等7家,占全省总量的77%。
投运年限
均为近15年内投运,2009 - 2012年间投运465面,占67%;2004 - 2008年间投运164面,占24%;2013年新投运38面,占5%。
放电情况
近3年发生与受潮有关的故障共41起,故障率5.9次/百面,分布在9个供电局(占69%)和34座变电站(占35%)。
柜体类型分析
放电几乎全部发生在移开式开关柜(40起,占98%),固定柜仅1起。移开柜尺寸小、结构复杂,空气净距多不满足标准要求,绝缘裕度小,绝缘件多;固定柜结构尺寸大,空气净距远大于标准,绝缘裕度大。
厂家分析
行业制造质量水平不高,各厂家产品受潮放电故障率普遍较高。某必达运行情况良好,故障次数和故障率最低;湖南开关、许继电气质量问题最为严重。
03
主要厂家调研情况
金晖隆
主要有落地式KYN61 - 40.5型、中置式KYN58 - 40.5和固定式XGN2 - 40.5三种型号,受潮放电集中在移开柜。移开柜受外形尺寸限制,空气净距无法满足300mm要求,采用绝缘热缩套作为复合绝缘,加装后最小空气静距不小于250mm(一般260mm),35kV热缩套厚度不低于3mm,热缩套与铜排一起试验验证。绝缘板由环氧板改为SMC板,固定柜绝缘裕度大,凝露试验未通过。
必达电器
主要有落地式KYN61 - 40.5型和固定式XGN81 - 40.5型,受潮放电集中在移开柜。移开柜绝缘系统设计增加绝缘裕度(大于300mm),通过弯曲铜排、减小宽度等满足标准要求。绝缘板由环氧板改为SMC板,固定柜绝缘裕度大,凝露试验通过。
04
放电原因及整治措施
放电主要原因
运行环境恶劣,相对湿度超过设计使用湿度,箱式变电站隔热效果差更易凝露;绝缘系统设计裕度过小,部分产品爬电距离和电气间隙不满足标准;
开关柜绝缘系统设计不合理,未采用均压屏蔽技术,存在局部电场场强过强;
绝缘材料材质存在问题,加工工艺不精,大部分未通过凝露污秽试验;安装、检修、维护不当,如电缆安装方式不正确、未接高压端屏蔽线等。
整治措施
对35KV高压柜增装防凝露装置、加热板、柜顶风机,各隔室顶部开百叶窗通风孔,降低IP防护等级至IP3X;
改善设备运行环境,对高压室密封改造,封堵进线电缆孔等位置,配备抽湿机或空调机;
加强运行指导,湿度≥85%时检查高压室密封、抽湿设备、驱潮装置及温湿度控制器状态;
箱式变电站做好箱体缝隙密封,多雨地区加装防雨棚,修编技术规范增加凝露污秽试验要求;
增加绝缘裕度,保证绝缘距离,热缩套不能作为复合绝缘,建议增大移开式开关柜尺寸,通过铜排弯曲等增加相间距离;
采用双层均压屏蔽技术,对导电件圆弧化、去毛刺,选用外形圆滑的电流电压互感器,优化元件布局;将环氧板改为SMC板;改进安装、检修和维护工作,重视电缆及屏蔽线正确安装。
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CONNECT:[ UseTime:0.000527s ] mysql:host=127.0.0.1;port=3306;dbname=h_sjds;charset=utf8mb4
SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000892s ]
SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000302s ]
SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000246s ]
SHOW FULL COLUMNS FROM `set` [ RunTime:0.000488s ]
SELECT * FROM `set` [ RunTime:0.000202s ]
SHOW FULL COLUMNS FROM `article` [ RunTime:0.000528s ]
SELECT * FROM `article` WHERE `id` = 512809 LIMIT 1 [ RunTime:0.000406s ]
UPDATE `article` SET `lasttime` = 1778720111 WHERE `id` = 512809 [ RunTime:0.004282s ]
SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000230s ]
SELECT * FROM `article` WHERE `id` < 512809 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000428s ]
SELECT * FROM `article` WHERE `id` > 512809 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000364s ]
SELECT * FROM `article` WHERE `id` < 512809 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.003943s ]
SELECT * FROM `article` WHERE `id` < 512809 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.002196s ]
SELECT * FROM `article` WHERE `id` < 512809 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.000657s ]
0.082081s