Analysis of Electromagnetic Transients in HV Substations: Main Issues and Investigation Methodologies and Tools (original) (raw)

Abstract

This paper addresses the issue of the analysis of t he effects of lightning flashes (direct and indirec t) on power grid HV substations, in terms of the evaluation of overvoltage/overcurrent waveforms reaching the devices which could be potentially more afflicted by such d isturbances, namely the power transformers (or autotransformers). The study is mainly devoted to i dentify the more suitable models, methodologies and investigation tools to carry out transient evaluati ons on HV substations (1) with the final aim to def ine a calculation platform into the PSCAD-EMTDC electromagnetic environment (2) for the simulation of real p ower grid configurations. To investigate the cause of lightning failures of i nterconnection (auto)transformers, the first issue to be considered is the definition of suitable high frequ ency (HF) models for all the components of the power system under analysis (Fig. 1) and the development of tech niques for fitting the model parameters with rated character...

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