6SL3353-3AG35-5CA0
具体试验方法为通过提高试验电压或频率建立主绝缘电寿命曲线。至少选择3个电压或频率,并以绝缘发生击穿时为试验终点。每个试验电压下至少7个主绝缘样品。在试验过程中一般需要注意以下几点:
避免引入在实际运行中不存在的失效机理;
通过提高试验电压或频率建立主绝缘电寿命曲线;
如果使用工频电压(50Hz或60Hz),在高电压下的平均失效时间应为50h左右且低电压下的平均失效时间应大于5000h。
其中主绝缘鉴定试验合格准则为:在同一频率下对比待评和基准寿命曲线:
在相同的试验电压下,待评结构寿命曲线的90%置信上限超过基准主绝缘寿命曲线的90%置信上限;
在低试验电压下,待评结构寿命曲线的90%置信下限大于或等于基准主绝缘寿命曲线的90%置信下限。且待评结构均值回归线的斜率比基准绝缘结构寿命曲线的斜率陡(如待评结构的n值大于基准结构)。
6SL3353-3AG35-5CA0
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