【摘要】 换流变压器结构复杂,在其中的某些油、纸板和电极的三结合点处极易发生沿面局部放电,运行过程中沿面局部放电导致的沿面闪络是导致换流变压器事故的主要原因。换流变压器阀侧绕组承受的是交直流等多种电压的复合电压,研究复合电压作用下沿面放电的放电特性,对于换流变压器的绝缘试验、击穿机理研究均具有重要意义。文中构建了油纸绝缘典型的沿面放电模型,研究了交直流复合电压下油纸绝缘沿面局部放电特性,通过调节不同的直流电压分量幅值,研究了复合电压中直流电压分量对局部放电特性的影响规律。更多还原

【Abstract】 The main cause of converter transformer accident is surface flashover caused by surface partial discharge.The withstand voltage of valve side of converter transformer insulation is composite voltage of DC and AC. It has a great significance for the converter transformer insulation test,the breakdown mechanism to study the discharge characteristics of the surface discharge under composite voltage. The surface defect over oil/paper interface is made and the PD characteristics are studied under AC voltage and composite voltage of AC and DC. Independent voltage component in the composite voltage PD characteristics are analyzed through adjusting the DC voltage component amplitude.更多还原