Title: Overvoltage and insulation coordination for high voltage substation: methodology, modelling approach and case study

Authors: Mohan Muniappan

Addresses: Power System Studies Expert, Siemens Energy, Erlangen, Germany

Abstract: Transient overvoltage is one of the major concerns for high voltage (HV) substations and transmission systems. Overvoltage and insulation coordination (IC) studies are essential for the proper design of an insulation level of the HV substations. In this paper, the methodology and modelling approach for the IC studies such as temporary overvoltage (TOV), switching overvoltage (SOV) and lightning induced overvoltage (LIOV) cases for HV substations are presented. The modelling and simulation studies are carried out for 400 kV air-insulated substation (AIS) under TOV, SOV, and LIOV cases using PSCAD/EMTDC. The maximum overvoltage is determined for the TOV, SOV, and LIOV cases in a 400 kV AIS. Also, the determined peak overvoltage is compared with the standard insulation level of the equipment for TOV, SOV, and LIOV cases and provide the recommendation to reduce the overvoltage when it exceeds the maximum permissible limit.

Keywords: high voltage; overvoltage; transients; insulation coordination; switching; lightning.

DOI: 10.1504/IJPEC.2023.133626

International Journal of Power and Energy Conversion, 2023 Vol.14 No.1, pp.45 - 74

Received: 22 Apr 2023
Accepted: 14 Jul 2023
Published online: 25 Sep 2023 *

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