In these units, coils are enveloped in resign by process of moulding.
The transformer coils are solidly cast in resin under a vacuum in a mould.
The manufacture ring process in such that winding is locked in strong epoxy resign.
Epoxy resign as a high dielectric strength which makes the transformer sustain extreme operating conditions.
In the actual environments like chemical process plant, constructional material factories outdoor installations coil needs additional strength and protections. Cost resign is suitable for this.
In such environments salts, moisture caustic gases and metal particles ruin other types of dry transformers.
Electrical surges and overloads of repeated shorts duration are handled by this type.
Advanced electronic control the windings process this achieve uniformly distributed winding and high level of occurring.