A SIMULATION OF BREAKDOWN CHARACTERISTICS OF SUSPENSION INSULATORS UNDER LIGHTNING IMPULSE VOLTAGES

Abstract

This thesis proposed 2 models for simulating flashover of 1-4 disc suspension insulator strings under lightning impulse voltage, based on integration method and leader progression method. The voltage-time characteristics of insulator strings under 1.2/50 μs standard impulse voltage and 4.8/54.8 μs non-standard impulse voltage of both positive and negative polarities are simulated and compared with laboratory measurements. It is found that the model based on leader progression method with the proposed parameters can provide good results. The proposed model can also be applied to predict the critical flashover voltage of insulator strings with good accuracy.