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As a student of MBA – Power Management from the National Power Training Institute,
Faridabad, I got a rare opportunity to do my summer internship in Powergrid
Corporation of India Limited, India’s Central Transmission Utility.
Though my reporting office was the Regional Headquarters situated in New Delhi, the
authorities were generous enough to allocate me a working project that dealt with the
study of existing infrastructure at the 400/220 KV substation situated in Gurgaon which
supplies power to Haryana. The initial part of the project consisted of a thorough study
of the equipments used in the transmission substation. The study of existing
infrastructure showed the advantages of having a Gas Insulated Substation (GIS)
compared to the conventional one. It gives the advantage of housing the entire
machinery indoors, which eases the task of regular inspection, repair and maintenance.
Another big advantage is its easy compatibility with the Supervisory Control And Data
Acquisition (SCADA) system which provide easy mechanism for access and control.
The next phase of the project was about proposing an expansion plan of the existing
facility. The current system takes input at 400 KV and steps it down to 220 KV before
transmitting it to the Haryana distribution substation. Owing to the ambitious capacity
addition plans of the 12th five year plan, it has been decided to upgrade the existing
transmission facilities. In order to reduce the losses it has been proposed that the
transmission take place at 765 KV. A comparative study needed to be conducted to ascertain whether there was a need to completely overhaul the existing facility or an
upgrade would be enough.
The relevant study is still underway and it is expected to get over only by the end of this
year. Conducting tests on existing equipments requires coordination from all the three
vendors supplying the equipments, namely ABB, Samsung and Hayosung. From my 8
week stint at the substation, I could suggest the following measures:
 As the existing lines have been successfully charged at 765 KV, a complete
overhaul isn’t needed.
 The protective equipments of the circuits are in the process of being tested at
800 KV. The ABB machines stood up to the tests hence don’t need replacement
but the Hayosung equipments showed signs of instability during testing.
Samsung manufactured equipments could not be tested.
 Since there is plenty of barren land available in the vicinity of the existing
substation, there is no dearth of the space available for expansion. Thus, the
ideal scenario would be going for a mix of the two approaches, i.e. a healthy
mixture of expansion and up gradation.