摘要
特高压换流变压器的对地电位很高,所以对其在冲击电压作用下纵绝缘的考核更为严格。文中对特高压换流变压器端部普遍采用多根并绕分数匝插花纠结式线饼的等值纵向电容求解公式进行推导,并根据得出的绕组等值电路参数构建多绕组等值电路模型,最后对特高压换流变压器高压绕组在标准雷电冲击全波下的波过程进行分析计算。结果表明:插花纠结式线饼的等值电容要比普通纠结式线饼大很多,而且线饼并联导线根数越多,其等值电容越大。因此,插花纠结式线饼具有更加优良的抗冲击性能。
The potential of UHV converter transformer to ground is very high,so the test of longitudinal insulationunder impulse voltage is more stringent. In this paper,the equivalent longitudinal capacitance of interleave coil is de-rived which commonly used at the end of UHV transformer winding. The obtained equivalent circuit parameters areused to construct a multi-winding equivalent circuit model. The wave process of high voltage winding in UHV convert-er transformer under standard lightning full wave impulse is analyzed and calculated. The results show that the equiv-alent capacitance of interleave coil is much larger than that of ordinary coil,and the more number of parallel wires,the larger the equivalent capacitance. Therefore,interleave coil has more excellent anti-impulse performance.
引文
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