January 23, 2021
This document was originally created when the company was known as Alstom Grid. The company is now known as GE Vernova.
New 220 kV conversion substation enables Indian National Aluminium Company to boost production
An entirely new substation converts the 220 kVac power supply to 195 kA - 1,200 Vdc, feeding potline 4. The turnkey solution comprises four groups including:
- 10 x 220 kV semi-pantograph disconnectors,
- 12 lightning arrestors,
- 4 regulating transformers (105 MVA),
- 4 rectifier transformers (2 x 52.5 MVA each),
- 8 rectifiers (37 kA – 1,200 Vdc),
- 8 LEM (40 kA),
- 2 LEM (225 kA),
- 16 DC switches
- and the necessary group and potline control system.
Customer profile
NALCO (National Aluminium Company Limited) is a state-owned business. It operates opencast mines, refines alumina and smelts aluminium in Orissa in East India, the mountainous state on the Bay of Bengal where bauxite deposits were discovered in 1981.
Business challenges
In support of continuous growth, NALCO launched plans to step up the production capacity of the smelters at Angul, Orissa from 345,000 to 460,000 tons per year.
Project objectives
Install a new 220 kV conversion substation in order to power the additional 240-pot, 115,000-ton capacity potline-4 within a very short time.
Finding the right partner
Alstom Grid’s PEM unit in Massy, France, teamed up with Alstom Grid India to deliver indigenous equipment, civil works and installation. Alstom Grid Turkey (ATT) was chosen to manufacture the main power transformers and the 220 kV disconnectors were produced by Alstom Grid in Italy.
