Zhejiang Jiangshan Hengli Electrical Co., Ltd. is one of the leading manufacturers and suppliers of dry cast resin transformers in China. If you're going to wholesale durable dry cast resin transformers made in China, welcome to get pricelist from our factory. All customized products are with high quality and low price.
This is a Dry Cast Resin Transformer, it features high insulation and heat resistance, ensuring stable, durable operation in high-temperature, humid, and dusty environments. Its high-permeability grain-oriented silicon steel core reduces no-load loss, current, and operating noise. Ultra-low partial discharge, strong short-circuit withstand capability, and high mechanical stability ensure reliable performance under electrical and mechanical stress. With low losses, high energy efficiency, quiet operation, and long service life, it reduces operating and maintenance costs. Its compact design saves installation space, supports floor mounting, simplifies installation, and requires minimal routine maintenance.
Key Specifications
Capacity Range: 50kVA – 25,000kVA (customizable for residential, industrial, and utility applications)
Voltage Classes: High-voltage primary up to 35 kV; Low-voltage secondary typically 400V / 480V
Insulation Class: Class F (155∘C) or Class H (180∘C)
Cooling Method: AN (Air Natural) / AF (Air Forced)
Protection Class: IP00 (indoor), IP20, IP23, or custom outdoor enclosures
Frequency: 50 Hz / 60 Hz
Core Construction
Core
Made of high-permeability, cold-rolled grain-oriented (CRGO) silicon steel laminations with optimized joint angles to reduce no-load losses and noise.
Windings
High-voltage coils are cast in epoxy resin under vacuum to eliminate partial discharge. Low-voltage coils utilize copper/aluminum foil sheets to ensure high mechanical strength against short-circuit forces.
Encapsulation
Premium epoxy resin mixture reinforced with fiberglass, providing superior flame-retardant, self-extinguishing, and moisture-proof capabilities.
Dry Cast Resin Transformer vS. Oil-Immersed Transformer
The choice between a dry type and oil-immersed transformer depends on the project environment and technical requirements.
|
Feature |
Dry Cast Resin Transformer |
Oil-Immersed Transformer |
|
Insulation Medium |
Solid insulation |
Insulating oil |
|
Oil Leakage Risk |
No |
Yes |
|
Fire Risk |
Lower |
Higher |
|
Oil Maintenance |
Not required |
Required |
|
Indoor Installation |
Highly suitable |
May require additional fire protection |
|
Maintenance |
Low |
Higher |
|
Environmental Concerns |
Low |
Oil handling required |
|
Space Requirements |
Compact |
Typically requires additional oil-related components |
For indoor, fire-sensitive, environmentally sensitive, and maintenance-sensitive applications, a dry cast resin transformer can provide significant operational advantages.
Testing & Quality Assurance
We support personalized customization on voltage ratio, tapping range, protection grade, loss parameter, frequency, color and structural size. Each transformer undergoes strict testing procedures before delivery:
Routine tests (Factory Test)of transformer
1,Winding Resistance Measurement
2,Ratio Test (Voltage Ratio Measurement)
3,Transformer vector group test
4,Short-Circuit Impedance & Load Loss Test
5,No-Load Loss & No-Load Current Test
6,Insulation Resistance Test
7,Tests on-load tap-changer.
8,Oil pressure test on transformer to check against leakages past joints and gaskets
All products comply with IEC 60076 standard, and all other major international standard.
Certificates
FAQ
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