变压器长时感应耐压及局部放电试验参数估算

变压器长时感应耐压及局部放电试验受变压器容量、变比、联结方式等因素影响,试验频率及试验电流等参数相差较大。本文对变压器现场长时感应耐压及局部放电时的容性无功功率、试验频率、有功损耗及试验电流进行估算,简化出试验时变压器等效电容量计算公式, 对比集中电容法与分布电容法估算试验参数的准确性,为现场变压器长时感应耐压及局部放电试验提供参考。

Parameter estimation for locale long-time induction withstand voltage test and partial discharge test of transformer

Because of long- time induction withstand voltage test and partial discharge test oftransformer are affected by the factors of the transformer such as the different transformer capacity, thedifferent transformer ratio and the connection mode, the parameter error of test frequency and testcurrent is large. This paper estimates capacitive reactive power, test frequency, active power loss andtest current for locale long- time induction withstand voltage test and partial discharge test oftransformer, simplifies the transformer equivalent capacity calculation formula for test, compares theaccuracy of estimating parameters between concentrated capacity method and distributed capacitymethod, provides reference for locale long-time induction withstand voltage and partial discharge testof transformer.