2010-08-31 - As the switchyard is built on reclaimed land space saving was a crucial element in substation design
ABB in India has supplied and installed a 220KV switchyard with PASS (plug and switch system) hybrid switchgear, for evacuating power from India’s only barge mounted gas power plant. The order has been executed for GMR Energy’s 220 MW power plant established on the eastern coast of India. The scope of the turnkey switchyard system included a double bus six-bay 220 KV switchyard with hybrid switchgear, IEC-61850 automation and SCADA enabling solutions.
The floating power plant named Tanir Bavi, was earlier located at Mangalore in the state of Karnataka on India’s West coast and has been recently shifted to Kakinada in Andhra Pradesh, on India’s East coast. As the power plant is barge mounted it was easily transported by sea. Tanvir Bavi was earlier using naphtha as fuel and has now converted to gas to make use of the abundant gas resources recently discovered in the East Godavari region of Andhra Pradesh. ABB charged the switchyard in line with the generator commissioning at the power plant whereas total erection of the switchyard was completed in a period of 4 months.
The scope of equipment supply included 220KV PASS hybrid switchgear in double bus bar and single bus bar modules, 220KV current transformer and capacitor voltage transformer, control & relay panels with substation automation system and PLCC (Power Line Carrier Communication Equipment).
As the complete power plant auxiliary units and switchyard are on reclaimed land from the sea, space saving was major factor in this project. ABB’s innovative PASS modules helped in cost-reduction in terms of space saving of approximately 28% on-site and less Installation works. The substation also ensures high reliability and maintenance free functioning.
PASS is a hybrid version of air-insulated switchgear (AIS) and gas insulated switchgear (GIS) and up to 245kV the module are manufactured in ABB’s High Voltage Products factory in Lodi, Italy. The compact module can save up to 60% space as compared to conventional substations and possesses a major benefit in extension and/or refurbishment projects. Except for busbars all live parts in PASS are encapsulated in a grounded aluminum tank which is filled with pressurized SF6 gas. Each pole has its own enclosure, to increase availability and safety.
GMR Energy Ltd, which belongs to the GMR Group, has a significant presence in the power sector in India. GMR Group has a current installed capacity of 823 MW of power projects with nearly 8000 MW under various stages of implementation and development. GMR Energy has started exporting power from the barge mounted plant in Kakinada on trial basis.