一起10 kV配电变压器短路故障分析

针对某柱上配电变压器的短路故障,通过对配电变压器开展油色谱离线监测及直流电阻、绝缘电阻、变比测试数据的综合分析,并结合设备外观检查,判断出该配电变压器发生绕组变形、a相绕组有1根导线断股或脱焊,且a、b相铁芯与绕组间绝缘降低,最终解体检查验证试验数据理论的正确性,为以后分析配电变压器故障提供经验,并对其运行维护提出建议。

Analysis of short circuit fault of 10 kV distribution transformer

Aiming at the short-circuit fault of a pole distribution transformer, through the oil chromatography off-line monitoring and the comprehensive analysis of DC resistance, insulation resistance and transformation ratio test data of the distribution transformer, combined with the appearance inspection of the equipment, it was judged that the distribution transformer had winding deformation, one wire of phase a winding group is broken or desoldered, and the insulation between phase A and phase B iron core and winding is reduced, and the final disassembly inspection was carried out to verify the correctness of the test data theory, which provided experience for the later analysis of distribution transformer fault, and some suggestions for its operation and maintenance were proposed.