描述
处理方法。从维护方面出发可以分为两个步聚:(1)根据现场变压器状况分析,判断处理外部因素影响的多点接地故障。干式变压器因长期停用或没有密封,积尘、受潮或凝露,可先对铁心表面进行清理后采用多个太阳灯对铁轭进行烘烤,或是在条件允许情况下,可采用空载法进行烘烤。要做好安全防护工作,将其变压器高压侧开路,低压侧通额定电压,所需时间较短。如果排除绝缘件受潮影响原因后,若其绝缘电阻仍为零可用交流试验装置对铁心进行加压,当故障接地点不牢固,在升压的过程中会出现放电点,可根据相应的放电点进行处理。(2)采用逐级排查方法处理内在因素造成的铁心接地故障。通常使用直流、交流法对铁心多点接地故障点进行查找,检查时应该从上铁轭开始,拆除穿心螺杆后测试铁心对地绝缘电阻。如故障不在穿心螺杆则需拆除上铁轭的紧固螺杆,使铁轭与铁心分离后继续测试铁心对地绝缘电阻以判断故障点。由于干式变压器三相高低压线圈是由下铁轭承托,如果要拆除下铁轭测试其绝缘电阻难度很大,且对大容量干式变压器拆铁轭现场检修条件不具备。为了尽量不返厂处理,对此故障可采用电容放电冲击法、交流电弧法、大电流冲击法(采用电焊机)。
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