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Catalogue values for Distribution Transformer, 3 Phase, 11 kV > 200 KVA up to and Including 2500 KVA

Category Specification Bid Requirement (Allowed Values)
STANDARDS Energy efficiency level 1
BEE Star Rating 1
Installation, Testing and Demonstration No
Minimum warranty on receipt of stores (in Months) 30
Minimum warranty from the date of installation (in Months) 24
RATINGS Nominal system voltage, HV ( in kV) 11
Nominal system voltage, LV ( in V) 415
Standard ratings (in kVA) 630
Minimum basic insulation level (in kVP) 75
No load voltage ratios (in Volts) 11000/433-250
Highest system voltage for equipment (in kV) 12
Rated lightning impulse withstand voltage (in kV Peak) (Refer IS:1180 (Part 1):2014 Annex-D) 75
CONSTRUCTION Core mateial CRGO (as per IS:3024 latest)
Conductor (Winding) material Copper
Vector Group Dyn-11
Type of Mounting Ground Mounted
Noise level at rated voltage and freqeuncy, Maximum (in dB) 55
TRANSFORMER TANK Transformer tank cover construction Non-sealed, Bolted
Tank configuration with With radiator fins
Material of transformer tank Stainless steel
Minimum thickness of top and bottom material of transformer tank (in mm) 6
Minimum thickness of side material of transformer tank (in mm) 4
Material of Bolts/Nuts/Wahers exposed to atmosphere Stainless steel (for upto 12 mm size), Brass (for upto 12 mm size), Electro Galvanized (for above 12 mm size), Hot Dip Galvanized (for above 12 mm size)
Gaskets wherever used shall conform to Type III (as per IS:11149) Type C (as per IS:4253 (Pt.2)
Provision of conservator Yes , for Non sealed type with Plain tank construction
Painting Type of painting on inside of tank (hint: Refer Table 12 of IS:1180 (Pt.1):2014) Oil resistant paint
Type of painting on External surface of tank (hint: Refer Table 12 of IS:1180 (Pt.1):2014) Polyurethane (finish coat)
TAP CHANGER Winding tapped HV
No. of positions (in Nos.) 7
Voltage variation +5% to -10% in steps of 2.5% for variation of HV
TERMINAL ARRANGEMENT Transformer fitted with bushings of appropriate voltage and curent ratings on HV side Yes. 3 Nos. (Conforming to IS:2099)
Transformer fitted with bushings of appropriate voltage and curent ratings on LV side Yes. 4 Nos. (Conforming to IS:7421)
Suitable provision for adoption of cables of suitable size on LV side No
Cable End Box on HV side No
Cable End Box on LV side Yes
MARKING Material of rating plate Anodized aluminium
Marking method on rating plate Engraved
Rating and terminal marking plates combined into one plate Yes
OPTIONAL FITTINGS Suitable rating lightning arrestors HT Side, 1 No. per phase
Bird guard Yes
Terminal connectors Yes
Oil temperature indicator and widning temperature indicator Yes
Jacking pads No
Buchholz relay Yes
Magnetic oil level gauge with low oil level alarm contact No
Non return valve Yes
Protection relay for sealed type transformers for internal parameters that is pressure, temperature, oil level and gas detection Yes
Unidirectional flat rollers Yes
Drain cum sampling valve Yes with steel plug (for transformers upto 500 KVA)
Self protection / disconnection devices On secondary side (as per IS/IEC:60947-2:2003
Expulsion fuse as disconnection device On Primay side (as per IS:9385 (Part 2):1980
SERVICE CONDITION Maximum altitude <1000 m
TEST REPORTS & CERTIFICATIONS Availability of type test reports to prove the confirmity of the specification from NABL Accrediated
Agreed for stage Inspection as required by buyer Yes
SPECIAL TEST REPORTS Availability of test report for Determination of sound level test No
Availability of test report for short circuit withstand test No
Availability of test report for No load current at 112.5 % Voltage Yes
Availability of test report for Paint adhesion test No
BDV and moisture content of oil in the transformer Yes for 1 No.
Other requirements Losses and Impedance values as per Cl.7.8 and Table 6 of IS:1180 (Part 1):2014 latest, Limits of temeprature-rise as per Cl.7.10 of IS:1180 (Part 1):2014 latest