Dry-Type Transformer Guide
Selection, installation & maintenance for IEC 60076-11 compliant transformers
Series Comparison: SCB18 vs SCB14 vs SCB13
| Series | Efficiency Class | No-Load Loss | Load Loss | Best For |
|---|---|---|---|---|
| SCB18 | Class 1 (Ultra-Low Loss) | -30% vs standard | -15% vs standard | Data centers, hospitals with 24/7 operation |
| SCB14 | Class 2 (High Efficiency) | -15% vs standard | -10% vs standard | Commercial buildings, industrial facilities |
| SCB13 | Standard | Baseline | Baseline | General industrial applications |
Application Scenarios
🏥 Hospitals
- • Fire-safe operation required
- • Critical power continuity
- • Low noise level (<55dB)
- • EMI-sensitive equipment nearby
Recommended: SCB18 with Class F insulation
🖥️ Data Centers
- • 24/7 continuous operation
- • High power density
- • Low heat generation
- • Space constraints
Recommended: SCB18 AN cooling
🏭 Industrial Facilities
- • Heavy load cycles
- • Dusty environments
- • High ambient temperatures
- • Chemical exposure risk
Recommended: SCB14 or SCB13
🏢 Commercial Buildings
- • Office hours operation
- • Limited space
- • Aesthetic requirements
- • HVAC integration
Recommended: SCB14 AN
Installation Requirements
Clearances
Minimum 300mm from walls, 900mm from ceiling. Ensure adequate ventilation pathways.
Room Temperature
Ambient temperature should not exceed 40°C (104°F). Optimal: 20-25°C.
Ventilation
Provide 1m³/min airflow per kVA of transformer rating. Use intake and exhaust vents.
Mounting
Level concrete floor or structural steel platform. Secure with vibration dampers if needed.
Grounding
Connect transformer ground bar to main building ground. Comply with IEC 60364.
Technical Specifications (SCB18)
Electrical
- • Rated Power: 30 - 2500 kVA
- • Primary Voltage: 10kV, 12kV, 33kV
- • Secondary Voltage: 400V, 415V
- • Frequency: 50Hz or 60Hz
- • Vector Group: Dyn11, Yyn0
- • Impedance: 4% - 6%
Mechanical
- • Cooling: AN (Air Natural)
- • Insulation Class: F or H
- • Enclosure: IP00 or IP20
- • Noise Level: ≤55dB
- • Temperature Rise: 80K (F) / 100K (H)
Frequently Asked Questions
Q: What is a dry-type transformer?
A dry-type transformer uses air cooling instead of oil. It's fire-safe, environmentally friendly, and suitable for indoor installation in buildings where fire safety is critical.
Q: What's the difference between SCB18, SCB14, and SCB13?
SCB18 is Class 1 energy efficiency (ultra-low loss), SCB14 is Class 2 (high efficiency), SCB13 is standard efficiency. Higher class = lower operating costs but higher initial price.
Q: Can dry-type transformers be used outdoors?
Dry-type transformers are primarily for indoor use. For outdoor applications, consider oil-immersed transformers or use weather-protected enclosures.
Q: What ventilation is required?
Adequate air circulation is essential. Maintain minimum clearances: 12" from walls, 36" from ceiling. Room temperature should not exceed 40°C.
Q: How often should maintenance be performed?
Annual inspection recommended: check connections, insulation resistance, and clean dust/debris. IEC 60076-11 specifies maintenance requirements.
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