Single-phase Cast Resin High/Low Voltage Distribution Transformer

Applications

• Single-phase supply sections of rail transit
• Single-phase HV starting circuits for large machinery
• Special industrial high-frequency heating equipment
• Small step-down systems in rural areas
• Machinery equipment
• Hospitals
• Department stores
• Supermarkets
• Hotels
• Underground shopping streets
• Sewer systems
• Tunnels
• Electrified railways
• Steel plants
• Food factories
• Chemical plants
• High-tech electronics factories
• Other special sites or public buildings

Capacity

• Voltage level: 3.3, 6.6, 11, 22, 33kV or below
• Single phase: 3~150kVA
• Complete product series; custom designs available for special customer requirements

Product Features

• Withstands HV surges: The vacuum-cast epoxy resin layer provides very high dielectric strength, effectively blocking lightning or switching surges from the high-voltage side.
• Robust single-phase load capacity: Optimized for demanding single-phase unbalanced loads or local momentary heavy loads, delivering highly stable voltage output.
• No oil-leak risk: HV/LV conversion without insulating oil completely eliminates leakage risk and the high cost of ongoing oil testing.
• International quality certification: Certified to ISO 9001:2015, ensuring electrical safety.
• Flame-retardant and pollution-free: The insulation is a mixture of epoxy resin, quartz powder and other insulating materials, giving moisture resistance, weather resistance, flame retardancy and self-extinguishing properties. The epoxy resin does not release toxic gases under the high temperatures of combustion, and since the transformer contains no mineral oil or liquids, it causes no environmental pollution—a highly eco-friendly product.
• Strong short-circuit withstand: The coils are circular and the conductors are embedded in glass-fiber-reinforced epoxy resin, increasing AC and impulse voltage withstand while greatly reducing radial and axial electromagnetic forces on the coils during a short circuit.
• High lightning withstand: A unique HV coil winding technique gives uniform potential distribution and high impulse withstand, meeting the voltage and impulse withstand requirements of IEC or any other applicable standard.
• Low partial discharge: Designed for long-term use, the coils are cast under high vacuum, leaving no voids or bubbles; every HV coil undergoes partial-discharge testing during production for high safety.
• High thermal-shock resistance: Filler-free manufacturing technology provides high resistance to thermal shock, so coils do not crack or deform under drastic temperature changes or intermittent overloads.
• High overload capacity: Cast resin transformers have a large winding thermal time constant, so their short-time overload capability far exceeds other transformer types; forced-air cooling can further increase usable capacity.
• Strong moisture resistance: Because the coils are cast under vacuum, moisture cannot penetrate, making them suitable for high-humidity environments. Even after long storage, they can be energized without drying.
• Easy maintenance: Thanks to their non-absorbent properties and the absence of insulating oil, they can be operated almost maintenance-free.