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电力系统的绝缘 PowerPoint PPT Presentation


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电力系统的绝缘. 第一节 均匀电场气隙的击穿特性. 一、均匀电场气隙的击穿特性. 均匀电场击穿所需的时间很短,它在直流、工频和冲击电压作用下的击穿电压基本相同,击穿电压分散性很小,伏秒特性很快就变平。. 均匀电场空气间隙击穿电压特性可用下面的经验公式来表示 :. 式中 U b —— 击穿电压峰值, kV ; d —— 极间距离, cm ; δ —— 空气相对密度. 上式符合巴申定律。由上式可知,随着极间距离 d 的增大,击穿场强 E b 稍有下降。 相应的平均击穿场强 :.

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电力系统的绝缘

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