Zhejiang Jiangshan Hengli Electrical Co., Ltd. is one of the leading manufacturers and suppliers of dry resin transformer in China. If you're going to wholesale durable dry resin transformer made in China, welcome to get pricelist from our factory. All customized products are with high quality and low price.
Zhejiang Hengli Electrical supplies Dry Resin Transformers for power distribution systems where oil-free insulation, reliable operation and long service life are important. Also known as Cast Resin Dry Type Transformers, these units use epoxy resin to encapsulate the windings instead of liquid insulation.
The resin-encapsulated winding provides a solid insulation barrier around the conductors, helping protect the active parts from moisture, dust and common environmental contaminants. Vacuum casting is used to improve resin penetration and reduce internal voids, supporting stable dielectric performance during long-term operation.
Main Parameters
|
Parameter |
Typical Specification |
|
Rated Capacity |
50–5000kVA or customized |
|
HV Voltage |
6 / 10 / 11 / 20 / 35kV or customized |
|
LV Voltage |
0.4 / 0.415 / 0.433 / 0.69kV or customized |
|
Frequency |
50 / 60 Hz |
|
Phase |
Three Phase |
|
Insulation |
Epoxy Resin |
|
Cooling |
AN / AF |
|
Insulation Class |
Class F / H |
|
Winding Material |
Copper / Aluminum |
|
Vector Group |
Dyn11 / Yyn0 or customized |
|
Tap Range |
±5% or customized |
|
Standard |
IEC or as per project specification |
Final electrical ratings, losses, impedance and insulation levels are confirmed according to the approved technical specification.
Construction
A typical Dry Resin Transformer consists of a CRGO silicon steel core, HV and LV windings, epoxy resin insulation system, clamping structure, terminals and air-cooling arrangement.
The HV winding is vacuum-cast with epoxy resin to form an encapsulated insulation structure. The resin acts as both electrical insulation and mechanical protection, while the core and windings are designed to maintain appropriate heat dissipation through natural or forced air circulation.
For projects with higher thermal requirements, AF forced-air cooling can be added to increase heat dissipation. Enclosures, temperature sensors, fans and protection devices can also be configured according to the installation environment.
Key Features & Advantages
Vacuum-Cast Epoxy Insulation
Vacuum casting helps reduce air pockets and improve the integrity of the resin insulation. This is particularly important for medium-voltage transformers where insulation reliability and partial-discharge performance are key purchasing considerations.
Better Protection Against Moisture and Dust
Unlike an open-wound dry transformer, the encapsulated winding provides an additional barrier against humidity, dust and environmental contamination. This makes cast resin construction suitable for many indoor industrial and infrastructure installations.
Oil-Free and Low Maintenance
The transformer contains no insulating oil, eliminating oil leakage management, oil sampling and routine oil treatment. This can simplify maintenance for indoor electrical rooms.
Strong Mechanical Structure
The solid resin-encapsulated winding provides mechanical support and helps the transformer withstand the electromagnetic forces associated with short-circuit conditions.
Flexible Cooling Configuration
AN natural-air cooling is suitable for normal operating conditions, while AN/AF configurations can be selected where the load profile requires additional heat dissipation.
Shell protection device
The shell of the cast coil dry type power transformer is made of stainless steel or aluminum alloy.Protection grade can reach IP20 and IP23.IP20 housing can prevent solid foreign objects of diameter more than 12mm enter into and protect the transformer safely.IP23 housing can prevent the vertical drop of less than 60°of flow,suits for outdoor operation.
Project Example:
For a factory distribution room located in a humid industrial environment, a resin-encapsulated transformer can reduce the exposure of the windings to moisture and airborne contaminants while avoiding the need for oil containment.
Applications
Dry Resin Transformers are commonly selected for:
- Industrial plants and factories
- Commercial and high-rise buildings
- Data centers
- Hospitals and public facilities
- Metro and railway systems
- Solar and renewable energy projects
- Indoor substations
- Infrastructure and utility distribution
Cast resin designs are particularly relevant where indoor installation, fire behavior, environmental conditions and low maintenance are important project considerations.
Zhejiang Hengli Electrical – Factory Supply
Zhejiang Hengli Electrical provides factory-direct Dry Resin Transformer manufacturing with customized electrical and mechanical configurations. Before quotation, you can provide the required kVA rating, HV/LV voltage, frequency, installation environment, cooling method and applicable standard.
We can support project-specific requirements for winding material, vector group, impedance, tap range, enclosure and temperature monitoring. Relevant technical documents and factory test records can be supplied according to the agreed order specification.
FAQ
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