Tender For Budgetary Offer For Supply Of Transformers, Raigad-Maharashtra

Tender For Budgetary Offer For Supply Of Transformers; 1. 7MVA Step down Transformer: 3 No’s Parameter Details Type Dry Type, Cast Resin Power Transformer Rated Capacity 7 MVA Cooling Type AN (Air Natural) Primary Voltage 33 kV (or as per project requirement) Secondary Voltage 6.6 kV (or as required) Frequency 50 Hz Phase 3 Phase Vector Group Dyn11 Winding Material Copper (Electrolytic Grade) Insulation Class Class F Tapping Range Off-Circuit Tap Changer: -5% to +5% Temperature Rise Max 100°C, 50°C ambient (as per site conditions) Impedance 6.25% Enclosure IP Rating IP42 Outdoor (in container) Standard IEC 60076-11, IS 11171, IEC 60076-1 Page 2 of 4 2. 4 MVA Step down Transformer – 3 No’s Parameter Details Transformer Type Cast Resin Dry Type Transformer Cooling Type AN (Air Natural) Rated Capacity 4 MVA Frequency 50 Hz Number of Phases 3 Phase Primary Voltage (HV) 6.6 kV Secondary Voltage (LV) 690 V Tapping Range Off-Circuit Tap Link: ±5% in steps of 2.5% Vector Group Dyn11 Winding Material Copper (Class F) Installation Type (Outdoor with enclosure) Ambient Temperature 50°C Enclosure Protection (Optional) IP42 Outdoor (in container) Standard Applicable IS 11171 / IEC 60076-11 Impedance 8% 3. 4 MVA Converter duty transformer – 3 No’s Parameter Details Transformer Type Dry Type, Cast Resin, Converter Duty Power Rating 4 MVA Cooling Type AN (Air Natural) Primary Voltage (LV) 0.69 kV Secondary Voltage (HV) 6.6 kV Frequency 50/60 Hz Vector Group Dyn11 Impedance 8% No. of Phases 3 Phase Tapping Range Off-Circuit Tap Link: ±5% in steps of 2.5% Duty Type Converter Duty (suitable for feeding variable frequency drives or rectifiers) Winding Material Electrolytic Grade Copper Insulation Class Class F (winding), Class H (resin), max temp rise: 100°C Installation IP 42 Ambient Temp. 50°C Applicable Standards IS 11171 / IEC 60076-11, IEEE C57.12.01, IEC 61378-1 (for converter duty) Page 3 of 4 4. 250 KVA Aux. Transformer – 1 No. Parameter Details Transformer Type Dry Type, Cast Resin Encapsulated Rated Capacity 250 kVA Primary Voltage (HV) 6.6 kV Secondary Voltage (LV) 433 V Frequency 50 Hz Phase 3 Phase Cooling Type AN (Air Natural) Vector Group Dyn11 Tapping Range Off-Circuit Tap Link: ±5% in steps of 2.5% Winding Material Copper (Electrolytic Grade) Insulation Class Class F (winding), Class H (resin), Temp rise ≤ 100°C over ambient Mounting Indoor (or outdoor with enclosure) Enclosure Protection (optional) IP23 standard (upgradable to IP44/IP55) Applicable Standards IS 11171 / IEC 60076-11

Sr No	CorrigendumDate	Corrigendum	CorrigendumType	NewSubmissionDate
1	07-07-2025	Corrigendum_1	Other	10-07-2025

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