SJVN JFE & FE case studies

SJVN JFE & FE · Put your knowledge to work in context.

SJVN Limited is a Navratna public sector enterprise under the administrative control of the Ministry of Power, Government of India, established on 24 May 1988 as a joint venture of the Government of India and the Government of Himachal Pradesh. Its published shareholding pattern places 55.00% with the Government of India, 26.85% with the Government of Himachal Pradesh and 18.15% with the public. The SJVN JFE & FE case studies are 5 cases and about 5,286 words.

Feeder F-7: An Earth-Fault Relay That Cannot See the Fault

At the 132/11 kV auxiliary switchyard of a 412 MW run-of-the-river station, 11 kV feeder F-7 supplies the dewatering pump house and the gallery ventilation boards over 3.2 km of 3 × 95 mm² Cu/XLPE cable. The feeder CT is 200/1 A and the numerical relay uses the IEC Standard Inverse curve with a plug setting of 1.3 A and TMS 0.10; the instantaneous element is disabled because of the 11 kV/415 V transformer at the far end.

996 words, about 5 min 2

Part-Load Operation of a Francis Unit in the Monsoon

Each of the three 60 MW Francis units at a 180 MW station is rated at 100 m head and 70 m³/s at 150 rpm. The runner setting is 2.1 m above the minimum tailwater level, the summer water temperature is 25 °C (vapour pressure head 0.24 m), and atmospheric pressure is taken as 10.3 m of water.

1,060 words, about 5 min 3

Head Race Tunnel: Is the Head Loss Real, and When Do You Dewater?

A 330 MW station (3 × 110 MW) is fed by an 8.2 km concrete-lined D-shaped head race tunnel of 60 m² area, 25 m wetted perimeter and design Manning n = 0.014, designed for 250 m³/s at a gross head of 152 m with a design head loss of 9.0 m. After this year's floods, with all three units at 100 MW each (about 220 m³/s), the piezometric difference between the intake and the surge tank shows a head loss of 13.6 m instead of the expected value.

1,053 words, about 5 min 4

Line Commissioning: Two Crews, One Blocked Orchard, and a Rig on the Critical Path

A 220 kV double-circuit line, 42 km long with 108 towers, must be commissioned on 30 June. Today is 28 April and 18 km has been strung in the 48 working days since stringing began.

1,018 words, about 5 min 5

Unit-2 Trip at 02:40: The Message, the Chain and the Press Line

You are the shift engineer at a 3 × 110 MW station connected to the inter-state transmission system. At 02:40, Unit 2 (110 MW) tripped on generator differential protection; the 400 kV busbar protection did not operate and the other two units are running normally.

1,159 words, about 6 min