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Neriamangalam Power Station

Synopsis

Neriamangalam Power Station was commissioned on 12.04.1961 by the Vice President of India Dr. S Radhakrishnan with two units (Unit 1 & 2). Unit 3 was put on service later in 11.05.1963. Each unit had a capacity of 15 MW. After 43 years of glorious service, renovation and modernization of the units were carried out during the period 2004-06 and re commissioned the Unit 1 on - 20.10.2004, Unit 2 – 30.11.2005 and Unit 3 – 29.09.2006 with an enhanced capacity of 17.5 MW each. The Neriamangalam Extension Scheme is envisaged to utilize 167 MCM. (40%) of the total spill water of Kallarkutty Reservoir to generate 58.27 MU per annum into the existing grid. The Neriamangalam Extension Scheme (1 X 25 MW) Project was dedicated to the nation on 25th  May 2008 by the Honorable Chief Minister of Kerala.

Neriamangalam Power Station utilizes water head available in Masonry Dam at Kallarkutty which is constructed in Muthirapuzha stream. This water is conveyed through a tunnel of length 3239.11 Meters, which ends in a surge shaft. One Low Pressure Pipe (LPP) (dia.3.35 M) of 101M length leads the water to the penstocks. 1.60 M diameter penstock for each unit starts from butterfly valve (Internal dia. 1.60 M) at valve house.  Water entering to the turbine is controlled by (Internal dia.1100 mm) Spherical valve (Main Inlet Valve) at Power House. One Y-piece pipe was inserted in the LPP to divert water to the Penstock Butterfly Valve located in the new Valve House adjacent to the old Valve House of the old Neriamangalam Power Station to conduct water to NES Power Station. Penstock of 2M diameter and length 435 M for the unit starts from Butterfly Valve at valve house.  Water entering to the turbine is controlled by a Main Inlet Valve (Spherical valve) at the Power Station.

Being one of the earliest power stations in the state, Neriamangalam Power station is one of the landmarks in Kerala’s Power Sector. The power station is situated at Panamkutty in the Neriamangalam hill valley. It is located in Idukki District 40 Km from Munnar, the famous tourist destination and the nearest railway station is Aluva, 83Km from power house.

Salient Features:

Location with district : Panamkutty, Idukki District

Category : Hydro Power Project

Capacity : 77.5 MW

River : Muthirapuzha Basin

Dam : Kallarkutty

Annual Energy Potential : 158 MU for NPH and 58.27 MU for NES

Reservoir :

Catchment Area : 281.24 Sq. K.M (108.58737 Sq. Miles)

Gross Storage : 5.49 MCM

Generation per MCM : 2.09 MCM/MU for NPS & 2.2 MCM/MU

Design Head : 180 Mts. NES 178.Mts.

Full Reservoir level (FRL) : 1497.99 Ft. (456.59M)

Min. Draw Down Level (MDDL) : 1462.95 Ft. 445.91M

Design Disch. through Machine : NPS, 0.18 M3 /sec,    NES, 5.3M3/sec

Date of Commissioning:

Unit – 1 : 12.04.1961

Unit – 2 : 12.04.1961

Unit – 3 : 11.05.1963

Unit – 4 : 25.05.2008 (NES)

Date of Rennovation:

Unit – 1 : 20.10.2004

Unit – 2 : 30.11.2005

Unit – 3 : 29.09.2006

Unit – 4 :

Technical:

1. TURBINE, #1,#2,#3                                                #4 (NES)

a) Type : Francis, Vertical                                              Francis, Vertical

b) Make : VA Tech Hydro

c) Design Net Head : 180 Mts.                                       178.3 Mts.

d) Rated Output :       17.55 MW                                   25 MW

e) Output Max./ Min : 17.55MW/9MW                            25MW/22MW

f) Normal Speed : 600 RPM                                           500 RPM

g) Runway speed : 1080 RPM                                        850 RPM

h) Disc. Through Machine : 10.18 M3                             15.3 M3

2. GENERATOR #1,#2,#3                                         #4 (NES) 

a) Type : Vertical                                                          Vertical

b) Make : Alsthom, Switzerland                                   VA Tech.

c) Rated Voltage : 11 V                                               11 V

d) Rated Out put : 19500 KVA 17.5 MW                       27778 KVA 25 MW

f) Speed : 600 RPM                                                    500 RPM

g) Power Factor : 0.9                                                  0.9

3. GENERATOR Transformers (NPS)                        NES

a) Type :  Step up                                                    Step up

b) Make : TELK                                                        EMCO

c) Rated Voltage :11/110KV                                   11/110KV

d) Rated Out put : 22000 KVA                                   35000 KVA

4. Power evacuation

a) NR – MV   (110 KV Neriamangalam - Muvattupuzha)

b) NR – MU   (110 KV Neriamangalam – Muttam)

c) NR – AD   (110 KV Neriamangalam – Adimali)

d) NR – SE   (110 KV Neriamangalam – Sengulam)

e) NR – KU-I  (110 KV Neriamangalam – Kuthungal-I)

f) NR – KU-II  (110 KV Neriamangalam – Kuthungal-II)

g) 11 KV Kanjikuzhy

h) 11 KV Adimaly

i) 11 KV Pambla

j) 11 KV Murickassery

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