Transformers play a vital role in modern power distribution systems. Among them, the 33kV Dry Type Cast Resin transformer is a robust and efficient solution specifically designed for applications that demand safety, high performance, and reliability. This type of transformer is widely used in commercial, industrial, and utility power systems.
The 33kV dry type cast resin transformer is manufactured using F-class epoxy resin combined with high-performance fillers. It features high mechanical and electrical strength, excellent heat resistance, and long-term performance in challenging environments. The transformer’s internal components, including high and low voltage windings, are vacuum-cast under pressure to ensure durability and insulation integrity.
Key Features:
- High thermal stability (up to 350°C short-term)
- Fire-resistant and non-toxic
- Moisture-resistant, suitable for humid conditions
- Compact and easy to install
- Environmentally friendly—no oil or leakage
- High overload capacity (up to 150% with forced air cooling)
| Rated Capacity (kVA) | High Voltage (kV) | Tapping Range of High Voltage (%) | Low Voltage (kV) | No-load Loss (W) | Load Loss (W) | Short Circuit Impedance (%) | No-load Current (A) |
|---|
| 50 | 35 | ±5 / ±2×2.5% | 0.4 | 450 | 1420 | – | 1.6 |
| 100 | 35 | ±5 / ±2×2.5% | 0.4 | 630 | 2099 | – | 1.4 |
| 160 | 35 | ±5 / ±2×2.5% | 0.4 | 790 | 2810 | – | 1.3 |
| 200 | 35 | ±5 / ±2×2.5% | 0.4 | 880 | 3320 | – | 1.2 |
| 250 | 35 | ±5 / ±2×2.5% | 0.4 | 990 | 3800 | – | 1.1 |
| 315 | 35 | ±5 / ±2×2.5% | 0.4 | 1170 | 4510 | – | 1.1 |
| 400 | 35 | ±5 / ±2×2.5% | 0.4 | 1370 | 5410 | – | 1.0 |
| 500 | 35 | ±5 / ±2×2.5% | 0.4 | 1620 | 6650 | – | 1.0 |
| 630 | 35 | ±5 / ±2×2.5% | 0.4 | 1860 | 7690 | 6 | 0.9 |
| 800 | 35 | ±5 / ±2×2.5% | 0.4 | 2160 | 9120 | 6 | 0.8 |
| 1000 | 35 | ±5 / ±2×2.5% | 0.4 | 2430 | 10400 | 6 | 0.8 |
| 1250 | 35 | ±5 / ±2×2.5% | 0.4 | 2830 | 12700 | 6 | 0.7 |
| 1600 | 35 | ±5 / ±2×2.5% | 0.4 | 3240 | 15400 | 6 | 0.6 |
| 2000 | 35 | ±5 / ±2×2.5% | 0.4 | 3820 | 18200 | 6 | 0.6 |
| 2500 | 35 | ±5 / ±2×2.5% | 0.4 | 4455 | 21800 | 6 | 0.5 |
This transformer is engineered to perform under a wide range of temperature and humidity conditions:
- Continuous stability at 220°C
- Short-term operation at up to 350°C
- Fire-retardant with no flame spread at 250°C
- No emission of toxic gases at 750°C
- Functional under 100% humidity conditions
- Enhanced safety: Fireproof and self-extinguishing material
- Eco-friendly: No oil leakage, no pollution
- Cost-efficient: No need for complex fireproof room or oil pit
- Low maintenance: Dust-proof, corrosion-resistant enclosure
- Flexible installation: Ideal for indoor and outdoor environments
- Power distribution in residential buildings
- Energy systems in hospitals, shopping malls, airports
- Critical infrastructure such as power plants and substations
- Urban centers and smart city projects
- Industrial manufacturing and agriculture
Frequently Asked Questions (FAQs)
Dry type transformers are safer, require less maintenance, and are environmentally friendly. They don’t use oil, so there is no risk of leakage or fire hazards, making them suitable for indoor and enclosed environments.
With forced air cooling, this dry-type transformer can operate continuously at 150% rated load, offering great flexibility during peak demand periods without compromising performance.
Yes, with proper enclosures or protection ratings (such as IP23/IP33), dry type transformers can be deployed in outdoor substations or switchgear setups, especially in high-humidity or dusty environments.
Applicable Standards
This transformer complies with:
- IEC 60076
- GB/T 10228
- ANSI/IEEE standards for dry type transformers
Installation & Testing
Each unit undergoes rigorous testing before shipping:
- Insulation resistance test
- Vector group verification
- Partial discharge analysis
- No-load and short-circuit tests
- Induced voltage test
- Humidity protection checks
