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The 35kV Indoor Dry Type Power Transformer with On Load Tap Changer (OLTC) is a compact, environmentally friendly solution designed for reliable power distribution in:
Indoor substations
Commercial facilities
Industrial plants
Using vacuum-cast epoxy resin insulation, this transformer eliminates the need for mineral oil, offering a fire-safe, low-maintenance alternative to oil-filled units.
The integrated OLTC allows seamless voltage regulation under load, ensuring stable power supply in fluctuating grid conditions.
| Component | Material / Feature |
|---|---|
| Core | High-grade grain-oriented silicon steel (minimizes hysteresis losses) |
| Windings | Epoxy-encapsulated (thermal conductivity + mechanical protection) |
| OLTC | Motorized drive with digital control (±10% in 19 steps) |
| Insulation | Vacuum-cast epoxy resin (fire-safe, moisture-resistant) |
| Feature | Description |
|---|---|
| Oil-Free Design | Eliminates fire hazards and environmental risks – suitable for densely populated areas |
| On-Load Voltage Regulation | Maintains output voltage stability within ±0.5% – critical for data centers, hospitals, industrial processes |
| Low Noise & Vibration | Noise level <55dB – meets urban noise control requirements |
| High Thermal Stability | Operates up to 155°C (Class F insulation); short-circuit withstand exceeds international standards |
| Smart Monitoring | Optional digital sensors for temperature, tap position, load status – enables predictive maintenance |
| Standard | Description |
|---|---|
| IEC 60076 | Power transformers |
| IEEE Std C57 | IEEE standard for transformers |
| IEC 60216-1 | Humidity endurance (95% relative humidity) |
| Parameter | Value |
|---|---|
| Full load efficiency | >98.5% |
| Cooling options | Natural air (AN) or forced air (AF) – AF increases capacity by 25% during overload |
| Sector | Examples |
|---|---|
| Commercial Buildings | Office complexes, shopping malls, hotels (elevators, HVAC, IT) |
| Industrial Facilities | Manufacturing plants, refineries, mines (heavy machinery, VFDs) |
| Critical Facilities | Data centers, hospitals (downtime unacceptable) |
| Urban Substations | Compact indoor spaces, replacing bulky oil-filled transformers |
| Renovation Projects | Easily retrofitted (modular design, standard interfaces) |
Q: How often does the OLTC require maintenance?
A: Every 10,000 operations or 2 years – minimal lubrication and contact checks.
Q: Can it operate in humid environments?
A: Yes. Epoxy insulation is moisture-resistant, suitable for up to 95% relative humidity (IEC 60216-1).
Q: What is the efficiency rating?
A: >98.5% at rated load – low no-load losses from high-grade silicon steel core.
Q: Is it suitable for renewable energy integration?
A: Yes. Handles voltage fluctuations from solar/wind inverters; OLTC compensates for variable input voltages.
Q: How is cooling achieved in enclosed spaces?
A: Natural air convection (AN) or forced air (AF) – AF increases capacity by 25% during overload.
35kV Dry Type Power Transformer With Off-circuit Tap Changer
35kV Dry Type Power Transformer With On Load Tap Changer
