Very Fast Transient Overvoltages generated by Gas Insulated Substations

Author

Pinches, D.S. ; Al-Tai, M.A.

Author_Institution

Areva T&D Ltd., Stafford

fYear

2008

fDate

1-4 Sept. 2008

Firstpage

1

Lastpage

5

Abstract

Very fast transient overvoltages (VFTO) are caused by disconnector switching operations within a gas insulated substation (GIS). The very fast transient overvoltages contains very high frequency components in the order of several 10psilas of MHz and may cause high frequency oscillations in the transformer windings, leading to possible overstressing of the transformer insulation. By modelling a gas insulated substation as very short transmission lines with an electromagnetic transient programme it is possible to predict the magnitude of these fast transients and their high frequency components. In this paper, PSCAD/EMTDC was used to model the switching operation of disconnectors in a GIS installation.

Keywords

EMTP; gas insulated transformers; power system transients; power transformer insulation; power transmission lines; PSCAD-EMTDC; disconnector switching operations; electromagnetic transient programme; gas insulated substations; transformer insulation; transformer windings; very fast transient overvoltages; very short transmission lines; Electromagnetic transients; Frequency; Gas insulation; Geographic Information Systems; Power system transients; Power transformer insulation; Substations; Surges; Switchgear; Windings;

fLanguage

English

Publisher

ieee

Conference_Titel

Universities Power Engineering Conference, 2008. UPEC 2008. 43rd International

Conference_Location

Padova

Print_ISBN

978-1-4244-3294-3

Electronic_ISBN

978-88-89884-09-6

Type

conf

DOI

10.1109/UPEC.2008.4651627

Filename

4651627