While both are excellent dry-type technologies, Integral Cast Coil transformers represent the high-end tier for critical applications due to three main factors:

1) Structural Rigidity: In a cast coil transformer, the copper windings are placed inside a mold and flooded with epoxy resin under vacuum. Once cured, it forms a thick, solid block of resin. This provides vastly superior mechanical strength to withstand extreme short-circuit forces compared to the thin varnish layer applied in VPI processes.

2) Absolute Moisture & Dust Barrier: The thick resin casting completely seals the conductors. Unlike VPI, which can be susceptible to long-term harsh humidity if the varnish cracks, cast coils are practically impervious to heavy moisture, chemical vapors, and heavy industrial dust.

3) Partial Discharge Elimination: The strict vacuum casting process removes 100% of air bubbles from within the winding block. This results in an exceptionally low partial discharge rate, ensuring the transformer will not suffer from internal electrical breakdown over its 25+ year lifespan.

It is a dry-type transformer with windings encapsulated in epoxy resin under vacuum casting. There is no liquid insulating medium. The solid epoxy shell protects coils against moisture, dust and chemical corrosion. It features low partial discharge, stable insulation performance and good mechanical strength, widely used in indoor power distribution, commercial buildings and industrial power supply systems.

This transformer has no flammable insulating oil, so fire risk is greatly reduced. It requires little routine maintenance and can be installed directly indoors without an oil pit. It works reliably in humid or polluted environments, produces lower noise during operation and will not cause oil leakage pollution, which meets strict environmental and safety requirements for urban power projects.

Its winding temperature rise follows IEC standard. The epoxy cast winding usually allows 80K or 100K temperature rise under rated load. Built-in temperature sensors monitor coil real-time temperature and trigger alarm or trip when overheating occurs. Users need to ensure proper ventilation around the transformer to avoid excessive accumulated heat affecting service life.

Yes. The vacuum epoxy cast coil forms a fully sealed protective layer, isolating copper conductors from the external air. It can adapt to environments with high humidity, condensation and moderate dust. However, heavy corrosive gas or conductive dust will still damage surface insulation. We suggest adding protective enclosure for harsh site conditions to extend service life.