干式变压器线圈中冲击过电压的分析和改善

摘要

变压器运行时的冲击过电压会对变压器的绝缘造成很大危害。因此在变压器的设计阶段就计算并分析冲击电压下变压器线圈中出现的过电压，以便合理布局，改善变压器线圈的绝缘结构，保证变压器的安全运行。分析了干式变压器线圈中雷电冲击电压下的波过程，并列举了相关等值电路、起始电位分布，最后提出了相关改善建议。%When the transformer is running, voltage surge will cause great harm to transformer insulation.Therefore, we calculated and analyzed the overvoltage in transformer windings in the design stage of the transformer, so that the reasonable layout, improve the insulation structure of transformer coil, ensuring the safe operation of transformer. This paper analyzes the process of the lightning wave dry-type transformer coil under impulse voltage,and lists the relevant equivalent circuit,initial voltage distribution,finally put forward relevant suggestions for improvement.