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Gas-insulated substations (GIS) have different specifications in proportion to air-insulated substations. Transformer failures related to lightning and switching are often reported in the gas insulated substation (GIS). This problem is the voltage magnifications due to reflections of switching and lightning surges at various junctions within the GIS. Thereby overvoltages in GIS are more important than air-insulated substation. There are methods to suppress the stresses created by lightning and switching in the GIS. However, these methods are suitable before installing the substation and during the substation design period. This paper presents feasible methods for mitigation of the overvoltage magnitude. The advantages of the proposed methods are their simplicity and low cost for implantation along with producing minimal changes in the installed GIS.

Item Type:	Refereed Article
Keywords:	gas-insulated substations, very fast transient overvoltages, very fast transient currents, transient overvoltages, switching operations, lightning overvoltages, mitigation
Research Division:	Engineering
Research Group:	Electrical engineering
Research Field:	Electrical energy generation (incl. renewables, excl. photovoltaics)
Objective Division:	Energy
Objective Group:	Mining and extraction of energy resources
Objective Field:	Mining and extraction of energy resources not elsewhere classified
UTAS Author:	Tavakoli, A (Mr Ahmad Tavakoli)
ID Code:	94270
Year Published:	2011
Deposited By:	Engineering
Deposited On:	2014-09-04
Last Modified:	2014-09-08
Downloads:	0