SALIENT TECHNICAL FEATURE FOR 132 KV SWITCHYARD EXTENSION PACKAGE

Salient technical feature of equipment/systems/services covered in Tender ID:- 2018_NTPC_6990 dated 17.07.2018 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 feature/specifications of equipment/systems/services covered in the bidding documents. Details provision in regards of scope of work and technical specification/ equipment/services, contained in the bidding documents shall be final and binding.

BRIEF SCOPE OF WORK:

The scope of work comprises of execution of 132 kV Switchyard extension works at Darlipali STPP including 132/34.5kV Transformer, 33kV Switchgear, 33kVCable & LT switchgear (ACDB/DCDB Board) etc as shown in tender single line diagram. The 132 kV switchyard employs double bus switching scheme. The scope of work shall comprise, but not limited to the design, engineering, manufacture, testing and inspection at manufacturer’s works, packing, supply, transportation, transit insurance, delivery to site, unloading, storage and equipment erection including associated civil and structural works and 33kV Switchgear Building. Further it shall also include the cabling, lighting, lightning protection, earthing, fire protection, ventilation, association of sub vendors if any in the erection, supervision, site testing, inspection and commissioning of complete 132 kV switchyard extension work as per tender SLD.

132 kV systems employing “Double Bus scheme”. The various bays work envisaged under this package are as follows:

(i)2 nos. of Transformer Bays (Double bus scheme)

(ii)33KV HV cables for connecting 2 no. of Transformers to new 33 kV Switchgear and switchgear to OCPL terminal point (DP) (Boundary wall)

(iii)2 numbers of 132/34.5 KV, 31.5 MVA transformer

(iv)33KV Switchgear board

(v)LT switchgear board (ACDB/DCDB)

In spite of above following works also includes.

1.Scope of work also includes 33kV cables for interconnection of 2 no. of 132kV/34.5kV Transformers to 33kV Switchgear and 33kV Switchgear to 33kV Line up to plant boundary (DP) as indicated in the tender SLD.

2.Integration of control, monitoring and protection IEDs being provided for the present scope of 132kV Transformer bays with the existing substation automation system for control and monitoring from existing OWS/EWS in order to have completely integrated SAS. Supply of

energy meters and its integration with existing metering master station. The modification of existing busbar protection (GE make P741/P743) and integration of present scope bus-bar protection with existing bus bar protection is in the scope of the bidder.

3.Fire protection arrangement for 2 No 132/34.5KV, 31.5MVA transformers covered under the scope of work.

4.Switchgear building as indicated in the tender drawings is also covered under the scope. All the civil works of switchgear building along with its ventilation as per specification requirement is covered under the scope of work.

5.Interconnection and laying of LT power and control cables in existing ACDB/DCDB/MLDBs in 765/132KV switchyard control room building to propose 33 KV switchgear room and termination of the same in new ACDB/DC Fuse boards/MLDB.