66kV主变压器低压侧近区短路故障分析及预防
Jilin Electric Power(2020)
Abstract
针对一起66 kV主变压器低压侧发生近区短路故障进行诊断及分析.对绝缘电阻、直流电阻、电容量及介质损耗因数进行测试,并采用频响法测试一、二次绕组变形曲线,通过对测试结果分析判断二次绕组绝缘破损且存在严重变形、c相存在断股现象,对变压器进行解体检查,验证了分析结果的正确性.得出变压器近区多次短路冲击是造成故障的主要原因,提出加装限流电抗器、缩短保护动作时间等措施预防主变压器连续遭受短路冲击.
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