Overview
The epoxy resin cast dry-type transformer is a modern, safe and energy-efficient solution for power distribution. Unlike a traditional oil-immersed transformer, it contains zero oil, which eliminates leakage risk and fire hazards.
The windings are fully encapsulated under vacuum using flame-retardant epoxy resin. This produces excellent moisture resistance, low partial discharge and a long service life.
The transformer is available from 50 kVA to 5000 kVA with a primary voltage from 3 kV to 35 kV and a secondary voltage from 0.4 kV to 3.15 kV. It suits projects where safety, space and environmental requirements are strict, including high-rise buildings, hospitals, data centres, tunnels and industrial facilities.
Key Features
- Zero oil construction — the transformer contains no oil, eliminating leakage risk and fire hazards associated with oil-immersed designs.
- Vacuum encapsulated windings — the windings are fully encapsulated under vacuum using flame-retardant epoxy resin, giving excellent moisture resistance and long service life.
- Low partial discharge — the cast resin encapsulation produces low partial discharge.
- Wide capacity range — rated capacity from 50 kVA to 5000 kVA, with customisation available.
- Flexible voltage configuration — primary voltage from 3 kV to 35 kV and secondary voltage from 0.4 kV to 3.15 kV, both customisable.
- Copper or aluminium windings — windings can be supplied in copper or aluminium according to project requirements.
- Tapping range — tapping at ±2×2.5% or ±5% to suit the supply voltage conditions.
- Selectable enclosure protection — IP20, IP23, IP34 or IP54 enclosures are available as options.
Technical Specifications
| Product type | Epoxy resin cast dry-type transformer |
|---|---|
| Rated capacity | 50 kVA to 5000 kVA |
| Primary voltage | 3 kV to 35 kV (customisable) |
| Secondary voltage | 0.4 kV to 3.15 kV |
| Tapping range | ±2×2.5% or ±5% |
| Winding material | Copper or aluminium windings available |
| Enclosure protection | IP20, IP23, IP34, IP54 optional |
| Insulation | Flame-retardant epoxy resin, vacuum encapsulated |
| Oil content | Zero oil |
| Partial discharge | Low |
| Testing | 100% factory tested before shipment, including lightning impulse test |
| Warranty | 12 to 24 months |
Applications
- High-rise buildings and commercial complexes — indoor distribution where an oil-free transformer is required.
- Data centres and telecom stations — power supply for critical loads.
- Hospitals and laboratories — distribution where fire safety and reliability are essential.
- Subways, tunnels and airports — distribution in confined or high-traffic underground installations.
- Industrial plants and manufacturing lines — power supply for production equipment.
- Renewable energy systems — solar and wind power applications.
Installation Conditions
- Because the transformer contains zero oil, no oil containment or bunding is required at the installation.
- The enclosure can be specified from IP20 to IP54 to suit the cleanliness and humidity of the installation room.
- Maintain ventilation clearances around the transformer so heat is dissipated from the windings and core.
- Allow access for cable termination and for inspection of the windings and tapping links.
How to Select
- Rated capacity required, from 50 kVA to 5000 kVA.
- Primary voltage, from 3 kV to 35 kV, and the secondary voltage required.
- Winding material — copper or aluminium.
- Tapping range required — ±2×2.5% or ±5%.
- Enclosure protection level — IP20, IP23, IP34 or IP54.
- Installation environment and the relevant safety requirements.
FAQ
What does zero oil mean for this transformer?
The transformer contains no insulating oil at all. That eliminates the risk of oil leakage and removes the fire hazard associated with oil-immersed transformers, which is why it is preferred for indoor installations such as high-rise buildings, hospitals and tunnels.
How are the windings insulated?
The windings are fully encapsulated under vacuum using flame-retardant epoxy resin. This gives excellent moisture resistance, low partial discharge and a long service life, and it also provides mechanical protection for the winding.
What capacity and voltage range is available?
Rated capacity ranges from 50 kVA to 5000 kVA. Primary voltage ranges from 3 kV to 35 kV and secondary voltage from 0.4 kV to 3.15 kV, and both are customisable.
Can copper or aluminium windings be supplied?
Yes. The transformer is available with copper or aluminium windings, depending on the project requirements.
What enclosure protection levels are offered?
IP20, IP23, IP34 and IP54 enclosures are available as options. The level is selected according to the cleanliness and humidity of the installation room.
Is each transformer tested before shipment?
Yes. Every unit is 100% factory tested before shipment, and the testing includes the lightning impulse test. On-site installation guidance or third-party inspection can be arranged on request.
What is the warranty and lead time?
The warranty is 12 to 24 months. Lead time depends on the product type and order quantity, and is typically 10 to 15 working days. The minimum order quantity is one piece.
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