Cast resin Dry type Transformers

Design Structure

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  Insulation Type

  F and H class insulation are primarily used for the primary and secondary windings.

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  Winding Material

  Windings are made of copper or aluminium, depending on the current rating requirements.

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  Core Material and Hysteresis Loss

  Silicon steel is commonly used to ensure high permeability and minimal hysteresis loss.

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  Regulation

  Achieved with a leakage resistance of less than 2% to maintain design efficiency.

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  Lifespan

  Depends on winding insulation integrity, which is affected by temperature rise due to overloading.

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  Losses

  To minimize eddy current and core losses, leakage and winding resistance must be controlled.

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  Overload

  Leads to overheating, which limits loading capacity. A fan-cooling system is added to dry-type transformers to mitigate this issue.

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  Insulation Level

  Selected based on the primary impulse level, contributing to the transformer's longevity.

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  K-Factor

  Designed to withstand non-sinusoidal heat generation in the windings.