Key Features of High Voltage 1250 KVA Transformers

• Vector Group: Transformers will be connected as per vector group reference Dyn 11. Other vector groups can be offered as per specific requirements.
• Terminal Arrangement: H. V - Bare Bushings or Cable Box, L. V-Bare Bushings or Cable Box. Disconnecting
• Temperature Rise: 1250 KVA transformers including range of 25 KVA Transformers and 5000 KVA Transformers are designed for a maximum temperature rise of 40/50 degree C of oil/winding. Lower temperature rise can be offered on request.
• Core: The core is constructed from low loss, cold rolled, grain oriented, annealed lamination of electrical sheet steel conforming to the latest international standards. Special frame is built-in-house for clamping the core to reduce the magnetic noise as well as making the whole structure rigid and robust.
• Windings: Coils are wound with electrolyte high conductivity paper covered or synthetic enamelled copper conductors. Cooling ducts are provided to keep the hot spot temperature as low as possible. Coils are dried in electric ovens. Rigid connection support and coil clamping is provided to ensure high shot circuit strength.
• Insulation: Pecompressed board PARMALI Board and JAPANEESE insulation paper of best quality is used.
• Oil: Oil is tested for resistively, dielectric and acidic characteristic conforming to IS - 335. Before topping up oil is filtered thoroughly.
• Tanks: The tanks are made of M.S. steel plates / sheets with adequate bracing & stiffness. Tanks are pressure tested to withstand any type of inside or outside pressure. All the external surfaces are given a primary coat of zinc chromate, red oxide and two finishing coats of grey paint. The inner surfaces are given a coat of heat and oil resisting paint.