24-09-2012, 05:24 PM
Gas Insulated Substation
Gas Insulated Substationn1234.doc (Size: 54.5 KB / Downloads: 95)
Why we need GIS
1) Gas insulated Substations have found a broad range applications in power systems over the last three decades because of their high reliability Easy maintenance, small ground space requirements etc.,.
2) In our country also few GIS units have been in operation and a large number of units are under various stages of installation.
3) Although GIS has been in operation in several years, some of the problems are needful attention
4) These problems include VFTO during switching operations or earth faults and transient enclosure voltages and particle contamination.
Advantages of GIS:
a) Because of the entire equipment being enclosed in enclosures, filled with pressurized SF6 gas, installation is not subject to environmental pollutions, as experienced along coastal areas or certain types of industries.
b) Such installations are preferred in cosmopolitan cities, industrial townships, etc., where cost of land isveryhighand higher cost of SF6 insulated switchgear is justified by saving due to reduction in floor area requirement. It is not necessary that high voltage or extra high voltage switchgear to be installed out doors. c) Since most of the construction is modular and the assembly is done in the works, one site erection time both for supporting structures and switchgear is greatly reduced.
Gas Insulated Substationn1234.doc (Size: 54.5 KB / Downloads: 95)
Why we need GIS
1) Gas insulated Substations have found a broad range applications in power systems over the last three decades because of their high reliability Easy maintenance, small ground space requirements etc.,.
2) In our country also few GIS units have been in operation and a large number of units are under various stages of installation.
3) Although GIS has been in operation in several years, some of the problems are needful attention
4) These problems include VFTO during switching operations or earth faults and transient enclosure voltages and particle contamination.
Advantages of GIS:
a) Because of the entire equipment being enclosed in enclosures, filled with pressurized SF6 gas, installation is not subject to environmental pollutions, as experienced along coastal areas or certain types of industries.
b) Such installations are preferred in cosmopolitan cities, industrial townships, etc., where cost of land isveryhighand higher cost of SF6 insulated switchgear is justified by saving due to reduction in floor area requirement. It is not necessary that high voltage or extra high voltage switchgear to be installed out doors. c) Since most of the construction is modular and the assembly is done in the works, one site erection time both for supporting structures and switchgear is greatly reduced.