Lightning overvoltages in electrical power system of a power plant

Deepak Subedi, Matti Lehtonen

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review


This paper analyzes lightning overvoltage spikes in an internal network of a large power plant. The cases considered are direct stroke to the phase conductor of the connected power transmission line and back flashover resulting from the lightning stroke to the transmission tower or shield wire. To investigate the transmitted overvoltages through transformers, high frequency models of the transformers are used. The voltage rise at the secondary side of each connected transformer at different voltage levels in the house load network of the power generation plant is analyzed. Protective measures are compared in order the study how to mitigate the transferred overvoltage at the different house load power system levels and to ensure that the impulse voltage is within the basic insulation level (BIL) of the connected equipment. Simulations using different combinations of protective surge arrestors and protective capacitors are done and recommendations on overvoltage protection are presented.

Original languageEnglish
Title of host publicationProceedings of the 2019 20th International Scientific Conference on Electric Power Engineering, EPE 2019
EditorsStanislav Rusek, Radomir Gono
Number of pages4
ISBN (Electronic)9781728113333
Publication statusPublished - 1 May 2019
MoE publication typeA4 Article in a conference publication
EventInternational Scientific Conference Electric Power Engineering - Kouty nad Desnou, Czech Republic
Duration: 17 May 201719 May 2017
Conference number: 18

Publication series

NameInternational scientific conference electric power engineering


ConferenceInternational Scientific Conference Electric Power Engineering
Abbreviated titleEPE
CountryCzech Republic
CityKouty nad Desnou


  • EMTP
  • overvoltage
  • surge arrestor
  • transformer

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