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s11变压器运行中常见故障分析及处理措施

作者:山东光大变压器制造有限公司 210 次浏览 时间:2019-08-29

信息摘要:

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 绕组的主绝缘和匝间绝缘故障。s11变压器绕组的主绝缘和匝间绝缘是容易发生故障的部位。主要原因是: 由于长期过负荷运行、或散热条件差、或使用年限长, 使s11变压器绕组绝缘老化脆裂, 抗电强度大大降低;s11变压器多次受到短路冲击, 使绕组受力变形, 隐藏着绝缘缺陷, 一旦遇有电压波动就有可能将绝缘击穿; s11变压器油中进水使绝缘强度大大降低而不能承受允许的电压, 造成绝缘击穿; 在高压绕组加强段处或低压绕组部位, 由于绝缘膨胀, 使油道阻塞, 影响了散热, 使绕组绝缘由于过热而老化, 发生击穿短路; 由于防雷设施不完善, 在大气过电压作用下, 发生绝缘击穿。s11变压器套管故障。主要是套管闪络和爆炸, s11变压器高压侧一般使用电容套管, 由于套管瓷质不良或者有沙眼和裂纹, 套管密封不严, 有漏油现象; 套管积垢太多等都有可能造成闪络和爆炸。铁心绝缘故障。s11变压器铁芯由硅钢片叠装而成, 硅钢片之间有绝缘漆膜。由于硅钢片紧固不好, 使漆膜破坏产生涡流而发生局部过热。同理, 夹紧铁心的穿心螺丝、圧铁等部件, 若绝缘损坏也会发生过热现象。此外, 若s11变压器内残留有铁屑或焊渣, 使铁芯两点或多点接地, 都会造成铁芯故障。

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