idukki Hydro power project

hydropowerplant

1. HYDRO POWER ENGINEERING PRESENTATION IDUKKI HYDRO ELECTRIC POWER PLANT BY Aslesha P ……....… 141132 Manaswini V ……. 141248 Sai Priya M ……...141236

2. INTRODUCTION This is one of the largest Arch Dam in Asia. It is constructed across the Periyar River in a narrow gorge between two granite hills Kuravan and Kurathi in Kerala, India. At 167.68 meters It supports a 780 MW hydroelectric power station in Moolamattom , which started generating power on 4 October 1975. Technically, the dam type is a concrete, double curvature parabolic, thin arc dam. This dam was constructed along with two other dams at Cheruthoni and Kulamavu .

3. Together, the three dams have created an artificial lake that is 60 km² in area. The stored water is used to produce electricity at the Moolamattom Power house, which is located inside nearby rocky caves The Government of Canada aided in the building of the dam with long term loans and grants

4. History The idea of constructing a dam for power generation was first conceived in 1919 In 1947, a preliminary investigation report was prepared and submitted by Sri. P. Joseph John. The project report was prepared in 1961 and the Planning Commission accorded sanction for implementing the scheme in 1963

5. Idukki Dam upstream view 1968 Idukki Dam downstream view 1971

6. In 1964, under the leadership of Sri. E.U.Philipose , Superintending Engineer, preliminary works of the project were started. Storage of water in Idukki reservoir commenced in February, 1973 . Commercial operation of the Power Station was Commissioned on 12 February 1976 by the then Hon. Prime Minister Smt. Indira Gandhi .

7. DAMS Idukki dam Type Concrete , double curvature parabolic, thin arch dam Height above deepest foundation 555 feet (168.91 m) Length at top 1200 feet (365.85 m)

8. Cheruthony Dam Type Straight gravity concrete Height above deepest foundation  453.4 feet (138.2 m) Length at top 2135 feet (650.9 m) Spillway length 240 feet (73.2 m) No. of gates (radial) 5 nos. 40 feet x 34 feet (12.19 m x 10.36 m)

9. Kulamavu Dam Type Gravity masonry Intake sill level 2245 feet (684.45 m)

10. RESERVOIR Total capacity 1996x𝟏𝟎 𝟔 𝒎 𝟑 Active capacity 1459x10 6 𝑚 3 Inactive capacity 536x10 6 𝑚 3 Catchment Area 649.3 𝑘𝑚 3 Surface Area 60 𝑘𝑚 2 Normal elevation 732.62 m (2404 ft)

11. Idukki Hydroelectric Project Hydroelectric Project name Idukki Hydro electric Project state Kerala Districts Idukki River Periyar Basin West flowing rivers from Tadri to KanyaKumar Hydroelectric Region Southern HE Region Total Installed Capacity(MW) 780 Type of Project Major (>25 MW) Purpose Hydroelectric Owner State ( KSEB )

12. POWER STATION Commission date 1975 Turbines 6x130 MW Pelton Turbines Installed Capacity 780 MW

13. This dam has a capacity to hold 2,000 M.cum (2 Billion Tonnes ) of water.  The water which is collected in the Reservoir is diverted by means of an underground water conducting system which consists of a power tunnel and two underground pressure shafts to the underground the Moolamattom Power House in Muvattupuzha Valley 43 kms away producing hydro electric power. The fall of the water of about 2200 ft from the high reservoir to the lower power house creates the force which generates the power. POWER GENERATION

14. Section 23 inch dia (7.01 m) finished horse shoe concrete lined (18 inches ie . 45.7 cm minimum 22 inches average i.e. 55.9 cm) Length 6652 feet (2027.53 m) POWER TUNNEL Type  Restricted orifice type with inclined shaft completely underground. Size 28 feet 6 inches (8.69 m) dia. finished 250 feet (76.25 m) long and inclined at 53°. SURGE SHAFT

15. PRESSURE SHAFT No. of pressure shafts (under ground) 2 nos. (steel lined) Length 3259 feet (993.34 m), 3136 feet (955.85 m) Butterfly valves One in each pressure shaft located 300 feet away from surge shaft Number of Penstocks 2 Length of Penstock (m) 955 Size of Penstocks 3.858-2.159 Design discharge through each Pen-stock ( Cumec ) 76.5 PENSTOCKS

16. PENSTOCKS

17. Hydroelectric Basin West Flowing Rivers Seismic Zone Seismic Zone-III Type of Development Storage Structure Type DAM Type Under Ground Powerhouse Status Operational Year Commissioned 1986 Size of power house 463 feet (141.1 m) length. 65 feet (19.8 m) width 113.5 feet (34.6 m) height POWER HOUSE

18. The Moolamattom Power House of the Idukki Hydro Electric Project

19. Idukki Power Station

20. Hydraulic head (m ) 660 MDDL for Power house (m) 694.94 Annual Design energy (MU) 2398 Firm Power (MW) 280 No. of Turbines/Units (MW) 6 Capacity per turbine (MW) 130 Total Installed Capacity (MW)  Sum of IC of all turbines 780 Head Class of turbine High (Above 60 m)

21. Water Conductor System (WCS) (m) 3.3 Type of Turbines Pelton Turbine Make U1-U3 Neyrpic Canada U4-U6 Dominion Canada Rated Head (Net RTD) (m) 660 Speed (rpm) 375 Generator Make U1-U3 GE Canada U4-U6 MIL Canada

22. Turbine Floor of Idukki Hydro Project

23. Turbine Runner Assembly Idukki Hydro Project

24. Turbine Generator Coupling Idukki Hydro Electric Project

25. Control Room of Idukki Hydro Electric Project

26. TAIL RACE TUNNEL Length of tunnel 4000 feet (1220 m) Tunnel section 26 feet x 23 feet (7.29 m x 7m) 'D' shaped, finished with full section lining. 26 feet x 24 feet (7.92 m x 7.32 m) in weak zones 'D' shaped, finished with lining only for floor and sides. Length of open channel 852 feet (259.7 m)

27. Access tunnel of Idukki Hydro Electric Project

28. SWITCH YARD Switch yard area 821 feet x 282 feet (250.24 m x 85.95 m) Transmission lines One double circuit line to Kalamassery one single circuit line to Tamil Nadu One single circuit line to Pallom and three feeder bays forfuture .

29. Moolamattom power house Switch yard view and area 

30. OTHER USES 1. Irrigation: The tail waters flowing to Kudayathurpuzha through tunnel and open channel is diverted for irrigation purposes in the  Muvattupuzha  Valley.  2. Tourist destination and attraction: Idukki valley is 121 km away from Kottayam, and is a small hill town surrounded by a spread of beautiful, wooded valleys and meandering streams. Idukki is a well known tourist centre in Kerala. The Idukki wildlife sanctury extends over the Thodupuzhaand   Udumbanchola taluks of Idukki district spread over 77 km 2  and is about 450 – 748 m above sea level. The Idukki Reservoir formed by three dams -  Cheruthoni , Idukki and Kulamavu - extends to 33 km 2 . One can find Elephants, bisons , sambars, deers , wild dogs, jungle cats, tigers, wild boars etc. and a variety of snakes like cobra, viper, krait and a number of non-poisonous snakes in this sanctuary. The birds of Idukki are Jungle fowl, myna , laughing thrush, black bulbul, peafowl, woodpecker, kingfisher etc