Dry Type Transformer

We present Dry Type Transformers, which are non-explosive fire resistant, air insulated and cooled by natural circulation of air through ducts provided in the winding. High temperature and high dielectric insulating material like glass fiber reinforced, nomex insulation tapes are used in such a way that the entire assembly is capable of withstanding high electrical and mechanical stresses with good dissipation of heat causing low temperature rise within the prescribed limit of insulation class.

Standard
The Dry Type transformer are manufactured to comply with National International Standards BIS, IS 11171, IEC 76
Description
The winding are made up of electrolytic Grade, Soft and bright annealed copper conductors covered with nomex insulating tapes. The wound coils are preheating and impregnated with silicon varnish under vacuum pressure and undergo a curing cycle. The low voltage coils are wound over glass fiber reinforced cylinder having high mechanical strength. The high voltage coils are supported over yoke on glazed porcelain or resin insulators. The core is made of CRGO silicon steel laminations duly annealed after shearing and assembled in mitred construction for low “No Load” Loss.
The yoke frame has adjustable pressure plates to clamp & secure the coils adequately. Lifting arrangements is provide on the top yoke frame so that the core and coil assembly is lifted. Off-circuit Tamping if required are provided on HV winding and terminated on fiber glass terminal board for changing the transformer ratio in “OFF CKT” position.
Applications
Fire safety and environmental aspects are of increasing importance especially in respect of energy supply. The substitution of oil-filled transformers by dry type transformers is one of the most important step towards it. Dry Type transformer is used when it has to be located near load center and in a fire hazardous place. As there is no oil used in the transformer and special type of fire resistant insulation are used for the windings the fire risk is considerably reduced.
Advantage

• More efficient
• Non toxic
• Highly safe
• Non flammable
• Space saving by placing near the load end
• Low Noise
• Low Maintenance
• Can be supplied with off circuit links