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The Compact dry transformer by Wendy zong
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The Compact dry transformer |
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Business,Business Opportunities,Manufacturing
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Electrical transformers are generally oil filled or dry. In oil filled transformers, transformer oil is the coolant for cooling the core and coil assembly of the transformer. Oil filled transformers are cost effective and operate generally at temperatures of the order of 70 to 90° C. They, however, require periodic maintenance and replacement of the oil and are susceptible to fire hazards. The transformer oil is environmentally polluting and may cause health hazards.
Dry type transformers comprise magnetic material core and coil assembly comprising windings with insulation between the turns and layers of the windings. The coil assembly is impregnated and/or encapsulated with a resin for each phase and assembled onto the core and located in a protective metallic tank. Such transformer is generally used for outdoor applications. Alternatively, the core and the impregnated and/or encapsulated coil assembly together is encapsulated further with a resin and used for indoor or outdoor applications without or with the protective metallic tank.
Dry transformers are compact, environmentally compatible and flame proof. They do not require periodic maintenance and are preferred in hazardous areas such as mines, densely populated residential areas or hospitals. Dry type transformer generally operates at temperatures of the order of 120 to 180° C. Temperature rise above ambient is the effect of losses in the windings caused by the resistance of the conductors of the windings and the current flowing through the windings and also losses in the magnetic material core. In order to reduce the losses, the windings are normally designed with lower current densities to provide larger crosssectional area of the conductors. This reduces the resistance of the windings and hence the losses. For a given set of design variables a lower current density increases the size and weight of the core. Higher the weight of the core, higher the no load losses. This also increases the cost of the transformer. Therefore, the operating temperatures of a dry-type transformer cannot be allowed to drop below certain limits if it has to be cost effective. Cooling ducts are known to be provided within or between the windings and core to facilitate passage of coolants such as air for the dissipation of heat and operation of the transformer at lower temperatures. Ducts add to the size and cost of the transformers. source:news suneltrans
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