• Miraj Instrumentation Services (I) Private Limited

Dry Type Transformers

Miraj Instrumentation Services (I) Pvt Ltd offers a range of Dry Type Transformers. These are non-explosive fire resistant, air insulated, and are cooled by natural circulation of air through ducts provided in the windings. High temperature and high dielectric insulating materials like glass fibre reinforced, and Nomex insulating 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. The transformers in general conform to IS 11171-1985 for dry type transformers. The windings are made up of electrolytic grade, soft and bright annealed copper conductors covered with Nomex insulating tapes. The wound coils are preheated and impregnated with silicon varnish under vacuum pressure and undergo a curing cycle. The low voltage coils are wound over glass fibre 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 and secure the coils adequately. Lifting arrangement is provided on the top yoke frame so that the core and coil assembly is lifted. Off-circuit tamping if required is provided on HV windings and terminated on a fibre glass terminal board for changing the transformer ratio in "off ckt" position. Voltage grade – up to 24 kV, capacity – up to 2000 kVA.