|
 The Power Station is a Run-of-River
scheme with an underground power plant. The underground power plant was
the first station in the north India and was commissioned in
the year 1975. The power station draws water from Ichari
dam located on the river Tons, one of the major tributary of river Yamuna.
The Chibro power station is a unique
engineering marvel in the country and was the first experience in
carrying out tunneling in the Himalayan Thrust Zones, which is a
challenge due to varied rock structure and strength and throws up
unexpected challenges in the tunneling effort.  The water from Ichari
dam is fed into the power station through a 6.2 km long Head Race
Tunnel (HRT) and the power plant comprising 4 units of 60 MW each with
Francis turbines of 84,000 HP output is housed in a rock cavern with
the major challenge of maintaining fresh air and safety measures due to
constraint in space. The Power Station's Design Energy is 750 MU with a
design head of 110 m.
The power plant has shown significant improvements since 2000 and the
generation has gone up in spite of restriction imposed by Irrigation
Department on the discharge in the tunnel and low hydrology in the year
2004-05.
There has been a restriction imposed by the Irrigation Department in
limiting the discharge in the HRT to 200 Cumecs
as against the earlier capacity of 225 Cumecs.
The plants downtime has reduced and the availability has improved
significantly.
The increase in the efficiency and availability has been possible due
to the number of maintenance and safety measures under taken which were
pending since long time. The APDP also provided funds for the
modernization in a limited way mainly for installation of
(i) Static Excitation System
(ii) Microprocessor based governors and
(iii) SF6 Breakers
(iv) Major overhauling of Unit-2
(v) Modernisation of Communication
System
(vi)Tandem control System
The major maintenance works undertaken in the plant that have been
responsible for improved performance are:-
i) Repairing of MIV.
ii) Monitoring of head loss.
iii) Reduction in the Break down losses.
UJVNL proposes to carry out the M&U of the power station which is estimated
to cost Rs. 201.25 crore.
The major M&U works proposed are:-
i) Modernization of Trash Rack cleaning
equipment at Ichari dam.
ii) Modernisation of Communication,
Test & Control, Protection & Instrumentation, fire
Protection equipment, switchyard equipment, hydro
mechanical equipment etc.
iii) Improvement in efficiencies of Turbines and generators.
iv) Replacement of old 220kV oil filled cables with new XLPE
cables
v) Replacement of Stators' cores
vi) Fire fighting system
vii) Fresh Air Ventilation System
The M&U works would enhance the life of power plant by another
20-25 years besides improvement in efficiency of turbines and
generators. The post M&U generation is expected to increase to 850
MU and the works are expected to be completed by 2011-12.
|
Year
|
2004-05
|
2005-06
|
2006-07
|
2007-08
|
2008-09
(Upto Nov-08)
|
|
Generation(MU)
|
637.90
|
804.94
|
756.17
|
755.08
|
724.19
|
|
