NTPC LIMITED
PROJECT : Kahalgaon Super Thermal Power Project, Stage-I & II (4x210 MW+ 3x500 MW)
PACKAGE NAME : 400/132 KV Switchyard Extension Package
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“Salient Technical Features of the equipment/systems/services covered in IFB No. 40044242 dated 10.09.2015, Bidding Document No. CS-4200-572D(R)-9 are mentioned below. These Salient Technical Features are mentioned only to facilitate the prospective bidders to prima-facie understand the requirements under the tender and shall not in any way limit or alter the scope of work and technical features/specification of equipment/ systems/ services covered in the Bidding Documents. Detailed provisions in regard of scope of work and technical features/specification of equipment/systems/services, contained in the Bidding Documents shall be final and binding.”
A BRIEF SCOPE OF WORK
The Brief scope of work for the subject Main Plant Turnkey Package for Barethi STPP, Stage-I (4x660 MW) is as follows:
The switchyards at KAHALGAON STPP (4x210 MW+3x500MW) envisaged under ‘400/132kV Switchyard Extension Package’ are of 400 kV & 132 kV level with 400 kV system employing “One and a Half Breaker scheme” and 132 kV system employing “Double Bus scheme”. The scope of work in brief under this package is as follows:
Execution of following bays at 400 kV Switchyard:
2 nos. of Line bays
1 no. of Bus reactor bay
2 nos. of 400/132kV of 200MVA ICT Bays.
2 nos. of Bus Section Bays
Execution of following bays at 132 kV switchyard:
3 nos. of Station Transformer bays
2 nos. of 400/132kV ICT bays
2 nos. of Bus Section bays
2 nos. of Bus Coupler bays
1 no of Interconnection bay
(iii) Interconnection to existing switchyard with new 132kV switchyard through 132kV EHV Cables.
The above scope shall include over all project management, coordination, design, engineering, supply, erection, testing and commissioning of 400 kV & 132 kV switchyards (including extension of switchyard control room building and supply & laying of 132 kV Cable and accessories) alongwith associated civil and structural works. The scope also includes civil works for equipments such as Bus reactor, ICTs, etc.
B SALIENT TECHNICAL FEATURES
The switchyards at KAHALGAON STPP (4x210 MW+3x500MW) envisaged under ‘400/132kV Switchyard Extension Package’ are of 400 kV & 132 kV level with 400 kV system employing “One and a Half Breaker scheme” and 132 kV system employing “Double Bus scheme”.
SYSTEM PARAMETERS
The system parameters shall be as under:
400 kV 132 kV
a) Highest system voltage : 420 kV rms 145kV rms
b) Lightning Impulse voltage : 1425kVp 650kVp
c) Switching impulse voltage : 1050kVp -----
d) Power frequency withstand : 630 kV(rms) 275 kV(rms)
for 1 min. (rms)
e) Max. fault level (1 sec.) : 50 kA 31.5kA
f) Minimum creepage distance : 10500 mm 3625mm
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