电力变压器局部放电试验时容性无功的分析与估算

高压大容量变压器在现场进行局部放电(简称局放)试验以及超高压、超大容量变压器在制造厂内进行局放试验时,均需用电抗器来补偿被试变压器的容性无功功率,以避免发电机组出现自励磁。为了合理地选择电抗器,试验前需准确地估算被试变压器的容性无功。对变压器容性无功进行了分析与估算,通过2个实例验证了容性无功功率估算公式的准确性,并具有较高的估算精度。

Analysis and Calculation of Capacitive Reactive Power During Partial Discharge Test of Power Transformers

The compensative reactors must be used to prevent the so called self-excitation of generators when high voltage and large capacity power transformer is tested in substation or extra-high voltage and extra-large capacity power transformer is tested in manufactory to measure the partial discharges. So it is important to calculate the capacitive power of the tested transformer before testing. In this paper two methods are introduced to deduct the calculation of capacitive reactive power of large power transformer,and some calculation formulas of capacitive power have been presented. This paper also demonstrates that these calculation formulas have relatively high estimation precisions.