Structure & Components of 1000kVA Cast Resin Dry Type Transformer Explained
Apr 16, 2026
Leave a message
In modern power distribution systems, the 1000kVA Cast Resin Dry Type Transformer stands out for its safety, reliability, and environmental friendliness.
As a professional manufacturer, GNEE specializes in designing and supplying high-performance Dry-type Transformers, including Three-Phase Dry-type Transformers, Cast Resin Power Transformers, and customized Indoor Three-Phase Transformers for global industrial and commercial applications.
This article explains in detail the structure and components of a 1000kVA Cast Resin Dry Type Transformer, helping you better understand its internal design and why it is widely used in power distribution projects.
Structure of 1000kVA Cast Resin Dry Type Transformer
The structure of a 1000kVA Cast Resin Dry Type Transformer is designed to ensure efficient heat dissipation, electrical insulation, and mechanical strength. Compared with oil-filled units, this cast resin distribution transformer adopts epoxy resin encapsulation, eliminating fire risks and oil leakage.
Core Structural Design of Dry-type Transformer
The main structural framework of a Dry-type Transformer includes:
- Magnetic core (silicon steel laminated core)
- High-voltage (HV) winding
- Low-voltage (LV) winding
- Insulation system (epoxy resin casting)
- Cooling system (natural air or forced air)
- Protective enclosure (optional)
The dry core transformer uses high-quality cold-rolled grain-oriented silicon steel sheets to reduce core losses and noise. This makes it a Low Loss Dry-type Transformer, ideal for energy-saving applications.
Core Components of 1000kVA Cast Resin Dry Type Transformer
Understanding each component of a cast coil dry type transformer helps buyers evaluate product quality and performance.
Transformer Core in Cast Resin Type Transformer
The core is the magnetic circuit of the Three-Phase Cast Resin Transformer. It is made of high-permeability silicon steel laminations, stacked to minimize eddy current losses.
Key features:
- Low no-load loss
- Reduced noise level
- Strong mechanical rigidity
High Voltage Winding in Cast Resin Power Transformer
The HV winding in a cast resin dry type transformer is usually made of copper conductors and encapsulated in epoxy resin under vacuum conditions.
Advantages:
- Excellent insulation performance
- Moisture and dust resistance
- High dielectric strength
This structure ensures the transformer operates safely in harsh environments such as factories, buildings, and substations.
Low Voltage Winding in Three-Phase Dry-type Transformer
The LV winding is typically made of copper foil or aluminum foil, designed to handle high current loads efficiently.
Benefits include:
- Strong short-circuit resistance
- Uniform current distribution
- Enhanced thermal performance
This design improves the reliability of the Dry distribution transformer in continuous operation.
Insulation System of Cast Resin Dry Type Transformer
The insulation system is the core advantage of a cast resin type transformer.
Epoxy Resin Casting Technology
In dry cast resin transformers, the windings are vacuum-cast with epoxy resin, forming a solid insulation layer.
Key advantages:
- Flame-retardant and self-extinguishing
- No partial discharge
- High resistance to environmental pollution
This makes the transformer ideal for Indoor Three-Phase Transformer applications such as hospitals, commercial buildings, and data centers.
Transformer coil casting process
Cooling System of Low Loss Dry-type Transformer
Cooling is essential for maintaining performance and extending service life.
Air Cooling Methods in Dry-type Transformer
A Low Loss Dry-type Transformer typically uses:
- AN (Air Natural) cooling
- AF (Air Forced) cooling with fans
The Three-Phase Dry-type Transformer can increase capacity by 30–40% when equipped with forced air cooling systems.
Advantages:
- No oil maintenance
- Lower operating cost
- Environmentally friendly
Protective Enclosure of Indoor Three-Phase Transformer
The enclosure protects the internal components of the cast resin distribution transformer from external factors.
Enclosure Types and Protection Levels
Common enclosure types:
- IP20 (basic indoor protection)
- IP23 (drip-proof)
- IP44/IP54 (dust and water protection)
Benefits:
- Improved safety
- Reduced risk of accidental contact
- Suitable for indoor and semi-outdoor environments
Finished transformer in warehouse
Monitoring & Protection Components in Cast Resin Transformer
Modern cast resin power transformers are equipped with intelligent monitoring systems.
Temperature Monitoring System
Key components include:
- PT100 temperature sensors
- Digital temperature controllers
- Alarm and trip functions
These systems ensure real-time monitoring of winding temperature, preventing overheating and extending transformer lifespan.
Technical Parameters of 1000kVA Cast Resin Dry Type Transformer
Below is a typical specification table for a 1000kVA Three-Phase Cast Resin Transformer:
| Parameter | Value |
|---|---|
| Rated Capacity | 1000 kVA |
| Phase | Three-Phase |
| Frequency | 50/60 Hz |
| Primary Voltage | 10kV / 11kV |
| Secondary Voltage | 0.4kV |
| Vector Group | Dyn11 |
| Cooling Method | AN / AF |
| Insulation Class | F / H |
| Protection Class | IP20 / IP23 / IP44 |
| Temperature Rise | ≤100K |
| Noise Level | ≤55 dB |
| Efficiency | ≥98% |
These parameters demonstrate the high efficiency and reliability of a Dry distribution transformer.
Advantages of Cast Resin Dry Type Transformer
The cast resin dry type transformer manufacturers focus on delivering superior performance.
Why Choose Dry-type Transformer?
- Fireproof and explosion-proof
- Maintenance-free operation
- Eco-friendly (no oil pollution)
- Compact and easy installation
- High mechanical strength
These advantages make it ideal for urban infrastructure, renewable energy projects, and industrial facilities.
Transformer loading and shipment at factory
Applications of Cast Resin Distribution Transformer
The cast resin distribution transformer is widely used in:
- Commercial buildings
- Hospitals and schools
- Industrial plants
- Renewable energy systems (solar/wind)
- Data centers and metro systems
Its safe and reliable design makes it the preferred Indoor Three-Phase Transformer in modern cities.
Why Choose GNEE as Your Cast Resin Dry Type Transformer Manufacturer?
As experienced cast resin dry type transformer manufacturers, GNEE offers:
- Advanced production lines and strict quality control
- OEM & ODM customization
- Global export experience
- Fast delivery and professional support
We are committed to delivering high-quality dry cast resin transformers that meet international standards.
Conclusion: Structure & Components of 1000kVA Cast Resin Dry Type Transformer Explained
Understanding the Structure & Components of 1000kVA Cast Resin Dry Type Transformer helps you make informed purchasing decisions for safe and efficient power distribution. From the core and windings to insulation and cooling systems, every part of a cast resin type transformer is engineered for performance and durability.
👉 Looking for a reliable Cast Resin Power Transformer supplier? Contact GNEE today to get a customized solution and competitive quote for your next project!
What common quality defects occur during the production of 1000kVA cast resin dry type transformer?
Common defects include epoxy cracks, bubbles, high partial discharge, uneven winding, loose core, and over-temperature rise. These are mainly caused by poor vacuum casting, insufficient curing, or unqualified raw materials. Our epoxy cast dry type transformers adopt vacuum pressure casting to ensure no cracks, low partial discharge, and stable performance.
Why do some 1000kVA dry type transformers have high no-load loss and noise?
High loss and noise result from low-grade silicon steel sheet, improper core lamination, loose clamping, or uneven winding tension. We use high-quality cold-rolled grain-oriented silicon steel and precision assembly to control loss and noise within IEC standards.
What damages may happen during transportation of 1000kVA dry type transformer?
Vibration and collision may cause loose fasteners, core displacement, winding deformation, or epoxy surface damage. We use fixed shipping base, overall packaging, and pre-delivery testing to ensure safe transportation.
Can 1000kVA cast resin dry type transformer be placed horizontally during transport?
No. Horizontal placement may damage winding insulation and internal structure. It must be transported vertically with clear lifting and upright marks.
What are the key installation requirements for 1000kVA dry type transformer?
It needs a level, firm concrete foundation, sufficient ventilation space, safe distance from walls and barriers. Poor installation will lead to vibration, noise and overheating.
Can 1000kVA epoxy cast dry type transformer be installed outdoors directly?
Standard cast resin dry type transformer is for indoor use. Outdoor installation requires an IP54/IP56 enclosure for rainproof, sun protection and ventilation.
Why does insulation resistance decrease after installation?
Moisture, dust, high humidity and dirty surface are the main causes. Regular cleaning and drying can restore insulation performance.
What is the normal temperature rise for 1000kVA cast resin dry type transformer?
For Class F insulation, the winding average temperature rise is ≤100K, hot-spot temperature ≤155°C. Overload, poor ventilation and dust will cause abnormal high temperature.
What causes abnormal noise during operation of 1000kVA dry type transformer?
Loose core, unbalanced load, voltage fluctuation, harmonics, uneven foundation or internal looseness after transportation.
Send Inquiry