Analysis of Breakdown Voltage of Low Pour Point Synthetic Ester Insulating Liquids Under Lightning Impulse Voltage of Both Polarities

In this article, the lightning impulse breakdown (LIBV) behavior of two low pour point synthetic ester liquids is presented in comparison to a typical synthetic ester (TSE) at both positive and negative polarities. Traditional mineral insulating oil has also been considered for reference purposes. A detailed breakdown behavior analysis of the four test liquids under a nonuniform field (medium gap, point-plane electrode system) and quasi-uniform field (smaller gap, U-plane electrode system) is envisaged. The LIBV measurements based on the source voltage waveforms and light activity during the discharge process are presented. The Weibull breakdown failure rates and streamer velocity during the breakdown of different liquids for all the cases (± polarities and both electrode configurations) are reported in support of the discussions. In the case of nonuniform fields, the lightning breakdown voltage of the low pour point liquids is found to be higher than TSE s and is comparable to mineral oil (MO) under both polarities. While in the case of quasi-uniform field, the lightning breakdown voltage of the low pour point liquids is found to be lower than MO and comparable to the TSE under both polarities. These findings add to limited knowledge on the application of esters in cold countries and allow insulation designers to estimate the behavior of the low pour point synthetic ester liquids under lightning conditions.