New ISTS substation proposed in India
A new substation has been proposed in the Indian state of Assam as a path for interconnection between the northeastern and eastern region grids.
Image for illustration purposes.
India, Assam: A new substation, as part of the interstate transmission system (ISTS) network, has been proposed in the Indian state of Assam as a path for interconnection between the northeastern region (NER) and eastern region (ER) grids. The Bongaigaon substation is currently the gateway to the NER grid as all synchronous interconnections to NER originate from it. As Bongaigaon is a flood-prone area and all ER-NER AC interconnections are solely through the Bongaigaon substation, any mishap there could endanger the supply to the entire NER.
The Central Transmission Utility of India Ltd (CTUIL) has supported the creation of a new 400 kV substation at Bornagar in Assam. It will be at 400 kV level, with provisions to establish 765 kV and 220 kV voltage levels in the future.
The Bornagar substation, to be a 400 kV ISTS switching station, is proposed to be set up with loop-in, loop-out (LILO) of the existing 400 kV double-circuit (quad) Bongaigaon–Balipara line, and establishment of a new 400 kV D/C (quad) Alipurduar–Bornagar line by shifting of the existing 400 kV D/C (quad) Alipurduar–Bongaigaon line from Bongaigoan substation to the proposed Bornagar substation.
A major portion of the project will also be the disconnection of 400 kV D/C (quad) Alipurduar-Bongaigaon line from Bongaigaon end and the extension of the line for termination at Bornagar substation, to form the 400 kV D/C (quad) Alipurduar-Bornagar line. The additional section will run about 110 km. The existing substations at Alipurduar, Balipara and Bongaigaon and their connecting lines are owned by Power Grid Corporation of India Ltd (PGCIL). The project will be housed under an ISTS scheme called “North Eastern Region Expansion Scheme – XXV”, expected to cost around INR 833.24 crore ($99.2 million).
Source: T&D India
