Tender Document Volume - 2 - BPDB

2.2.2 Step-Up Transformers And Associated Equipment:
1) One (1) lot of three phase bank of 3 single phase step-up transformers
and one spare transformer (capacity as specified in Clause 5.2.2) and associated
equipment with the following features.
Type
Rating
: Oil immersed Single phase,
outdoor power transformer
: To meet the required of
the specification as stated in Clause 5
Voltage ratio of single phase 11 230
transformer at full load : / KV
√3
Connection [HV-LV] :Ynd 11 as shown in single
line diagram.
Rated insulation level
: HV winding LV winding
Lighting impulse Withstand : .... kV (Peak) 75 kV Peak
Voltage (1.2/50 micro sec.)
Power frequency withstand : .......kV 28kV
Voltage (for 1 min).
Impedance voltage
: Shall be within the range of
15% and 18%
Tap changer
: On load at high tension
winding ±8 x 1.25 %.
Termination
High tension side
:Outdoor bushing for Cable Pot Head
Low tension side
:11 kV Isolated & insulated phase bus
duct and XLPE cables.
2) One (1) lot of associated equipment.
2.3. Unit Auxiliary Transformer, Station Transformers and Associated
Equipment
1) One (1) set of unit auxiliary transformer and associated equipment with
the following features:
Type
Rating
: Oil immerse, three phase and
two windings, outdoor power transformer.
: To meet the requirement of the
Specification
Ghorasal 200 MW to 300 MW Gas Turbine Peaking Power Plant Project (Vol-2 of 3)
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