Rihand

Rihand Power Station
Pipri, District : Sonebhadra, Uttar Pradesh


Installed capacity - 300 MW (6x50MW)

No. of units - 6







Sailent Features

01 Location i- about 165 km from Varanasi
ii- about 150 km from Mirzapur
iii-about 55 km from Obra
02 Name of River Rihand
  Name of Dam Rihand
  Name of reservoir Govind Ballav Pant Sagar
  Catchment area 5148 sq miles
03 - Details of Intake Structure
  Number 6
  Size of gates 15.20 ft x 27.15 ft
  Intake structure Bottom 701 ft
  Top 860 ft
  Trash Rack 6 Nos of 4 assemblies, 9.5ft x 14ft
04 - Details of water conductor system
  Penstock length 6 x 60 ft
  Dia of penstock 16 ft (each)
  CL of penstock inlet 734.49
  Pen stock operating gallery 6ftx 8ft at 683.67 ft
05 - Details of power house & Control room
  Power House Control Room
  Length 420 ft Length : 80ft.6 inch
  Width 86ft.6 inch Width : 27ft. 5inch
  Elevation of gen floor: 663 ft Elevation : 684 ft
  Elevation of erection bay floor : 683 ft  
  Elevation of erection bay floor : 683 ft  
06 - Head : 143 ft to 250 ft Max. discharge capacity from penstock : 93.77 cumecs
07 - Installed capacity : 300 MW (6x50 MW) Number of units : 6
08 - Type of turbine with details of governing system
  Type of turbine : Francis
Make : English Electric
Output at 199ft net head : 70000 BHP
Max. Output at net head of 224
and higher :
77000BHP
speed : 150 RPM
Max runaway speed : 273 RPM
Guide vane pitch circle dia : 14ft 4 inch
Guide vane height : 3ft. 4.5 inch
Spiral inlet dia : 15 ft. 3-13 /16 inch
Runner inlet dia : 11ft 2-1/2 inch
Runner exit dia : 12 ft 4-9/16 inch
Governor oil operating pressure : 270 - 300 lb/sq. inch
Governor oil pump motor : 30 HP., 1450 RPM
09 - Type of generator with excitation system Type of generator -- Vertical shaft salient pols umbrella type.
  10 - Excitation System.  
(a) Type wound Shunt wound self excited
(b) Max. Continuous rating 286 KW
(c) Nominal Voltage 360 volts
(d) Ceiling voltage 380 volts
(e) Rate of excitation response 1
(f) Field current for full load of generator at
Main Generator
Main excitor
0.9 pf & 12.1 kv
925 Amps
24 Amps
10 - Details of Tailrace
  Average tailrace water level : 632 ft
Max. probable tail water level : 675 ft
(spillway design flood)
Max. possible tail water level : 680 ft
 
Firm Power : 105 MW, Annual energy : 912 million kwh  
11 - Details of Switchyard
  Generating voltage 11000 volts
  Transmitting Voltage 132000 volts
  Number of bays 23
  Number of incomer 6 machine, Breaker - SF-6
  Bus coupler : 1 No. Breaker- MOCB
  Number of feeders 132 kv- 14 Nos 33kv - 1 No. 11kv- 4 Nos
Name of feeder (132kv)
(a) Anpara - I & II , Breaker - SF-6  
(b) Obra hydel - I & II, Breaker - MOCB  
(c) Kanoria factory - I, Breaker - MOCB  
(d) Robertsganj - I & II , Breaker - SF - 6  
(e) Aluminium (Hindalco) - I, II & III, Breaker - SF-6  
(f) Sonenagar (Bihar) - I Breaker - SF-6  
(g) Sonenagar(Jharkhand) - II, Breaker - ABCB  
(h) Obra Thermal - I, Brekaer - SF-6  
(i) Kota (NTPC, Singrauli)- I, Breaker - SF-6  
  Gen. transformer -6 No. Unit transformer- 6 Nos. + 2 Nos. Station
  Make - ASEA, SWEDEN
Type - Oil immersed water cooled with forced oil circulation
Rating - 60 MVA, 3 phase, 50 Hz., 132 / 11kv
Rating - 500 KVA, 3 Phase, 50 Hz, 11kv/0.415kv
  10 MVA Transformer : 2 Nos, Make - Lapper,132 kv / 33 kv
5 MVA Transformer   : 1 Nos. 33 kv / 11 kv
3 MVA Transformer   : 2 Nos, 33 kv / 11 kv
 
(xiii) Project Cost
  Total project cost Rs. 51.52 Crores
  Capital cost at the end of 2001-2002 Rs. 5151.72 lacs
  O&M cost and other cost, 2001-2002 Rs.1513. 1778 lacs
Unitwise Details of Machines as per name Plate
  (a) Turbine (b) Generator
  Make and type : English Electric, Francis type
Number : 6
O/P at best efficiency & 225 ft rated head : 70000 HP
Head : 143 ft to 250 ft
Speed : 150 RPM
Make & Type : English Electric, vertical shaft salient pole umbrella type
Number : 6
Out put : 55500 KVA
Power factor : 0.9 Lagging
Voltage : 11 KV, 3 phase, 50c/s
Details of Reservior
  (a) Name of reservoir : Govind Ballav Pant Sagar
  (b) Catchment area 5148 sq. miles.
  (c) Area submerged at full reservoir level 180 sq. miles
  (d) Gross storage capacity 86,00,000Ac-ft
  (e) Live Storage capicity 72,00,000 Ac-ft
  (f) Dead storage capacity 13,20,000 Ac-ft
  (g) Normal full reservoir level 880 ft., S.M.L
  (h) Max. probable reservoir level 886 ft. S.M. L.
  (i) Max. possible reservoir level 890.80 ft. S.M.L
  (j) Dead storage level 775 ft S.M.L
  (k) Average tailrace water level 632 ft. S.M.L
DAM
  (a) Name Rihand
  (b) Type Cement concerete, straight gravity
  (c) Length 3065 ft
  (d) Height 300 ft
  (e) Deepest foundation level 590 ft. S.M.L.
  (f) Elevation of road way at the top 894.5 ft
  (g) Base width at max. section 203 ft
  (h) Top width 24 ft
  (i) Volume of concrete in dam 20000000 Cubic ft
  (j) Total cement required 350,000 Ton
Package of RM & LE Work of Rihand Hydel Project
Package no.1
  (a) Suply, erection & commissioning of stator soil, core, field coils, & Unit 1,2,3,5 & 6surge ring
( F/H class insulation) CT, PT for GT cubicals, overhauling/ modification of CO2 system and ventilation system.
 (Supply, erection & commissioning)
 
  (b) Static excitation system
(c) Supply, erection and commissioning of Governor oil pumps
(e) Idler Valves for governing oil system
(f) HP lubrication oil system for thrust bearing
(g) Centralized grease lubrication
(h) Overhauling of Governor oil coolers
(i) Overhauling of breaking and jacking system
(j) Overhauling of cooling water system
(k) T & P item for erection & commissioning
Unit 1to 6
Unit 1to 6
Unit 1to 6
Unit 1to 6
Unit 1to 6
Unit 1to 6
Package no. -2
  (a) Repair of under water parts viz runner, guide vane, cleaning, repairing and epoxy painting of penstock. spiral casing and draft tube steel liner
Unit 1 to 6
  (b) Reapair /replacement of EVPV (emergency valve & plug valve) Motor & its erection & laying of new cable for remorte operation Unit 1 to 6
  (c) Painting of penstock up to the intake gate to spiral casing Unit 1 to 6
  (d) Overhauling of EOT cranes and replacement of cable  
  (e) Replacement of dewatering pumps.  
Package no. -3
1. Laying and termination
(a) Supply of control cable ( 2,4,6,10 & 16 core) (Switchyard) 1 job
(b) Supply laying and termination of power cables 1 to 6
  i. Supply, erection and commissioning of new static protection for machine 1 job
  ii. Supply and commissioning of new alarm/annunciation system (control room) 1 to 6
  iii. Supply and commissioning of Digital instruments for control/Turbine panel Unit 1 to 6
  iv.SCADA system for P.H. (for computerization and automation)  Unit 1 to 6
(c) Supply of Energy Meters of 0.2 accuracy All units and feeders
2.
(a) Supply, erection and commissioning of 500 Ah battery set for P.H.  2 nos.
(b) Supply, erection and commissioning of Battery charger 2 nos
(c) Supply, erection and commissioning of distribution boards for above 1 no.
Package no. -4
Capital overhauling of entake gate, draft tube gate and their hoisting arrangement.
Package no. -5 (Switchyard Equipment)
Package no. -6
(a) 11/132 KV Transformer (67.5 MVA) complete with multifyre projection system. 6 nos
(b) Auxiliary Transformer 500 KVA 6 nos
(c) Overhauling of centralized centrifuging syste (G.T)for main transformer.   
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