Design and Simulation of Gas Insulated Substation (GIS) for Electrified Railway System: Case study of Shiro Meda
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Date
2016-06
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Addis Ababa University
Abstract
Nowadays the demand for Gas Insulated Substation (GIS) is increasing over the world for efficient utilization of electric power and space. In this thesis a gas insulated substations is investigated or studied since they are more advantageous though, they use same protective devices or equipment when compared to air insulated substations. They are compact, requiring little maintenance, more reliable, have longer service life (more than 50 years) and safer. The compactness is due to the use of SF6 gas, which has high dielectric strength at moderate pressure for phase to phase and phase to ground insulation.
Gas insulated substation system creates a vision of the future more efficient substations which includes various technical, economic and environmental criteria, such as reliability, cost, interoperability, re-configurability, security, controllability and flexibility need to be considered. In this one of Addis Ababa Light rail transit (LRT) gas insulated substation has been studied, analyzed and compared to conventional air insulated substation.
This thesis work presents the design and simulation of gas insulated substation for the case of Shiro Meda. For this purpose, all the necessary electrical parameters data are collected through literature survey and from Ethiopian electric utility at the same time major components of gas insulated substation such as bus bar is designed consequently volume of SF6 is calculated.
For designing a substation it is crucial to know the maximum value of short circuit current of substation and load flow analysis. For this purpose Electrical Transient Analyzer Program (ETAP) power 12.6.0 version has been used for numerous fault condition in 3 phase132kV gas insulated substation. The load flow analysis and short circuit for different bus have been done and the result is within limit according to the IEC 60909 and IEC 61363 standard. However, our design results 12.5 and 90 and 92% reduction the cost of maintenance, space and operation by 12.5 and 90 and 92% respectively compared to air insulated substation.
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Keywords
Gas Insulated Substation, design, simulation, SF6, Etaps, Air Insulated Substation, short circuit, standards