Overview
The 400 kVA Dry Transformer is specifically engineered for the modernization of the CHE Scropoasa substation at 6.3 kV and 20 kV. It boasts maintenance-free epoxy resin insulation, a low-loss silicon steel core, and copper windings. This transformer operates using natural air cooling and allows for voltage adjustments of ±2x2.5%. It adheres to EN 60076 standards. Included accessories are a bidirectional trolley, temperature sensors, and an integrated temperature control system. The transformer is capable of handling substantial overloads and complies with the ECO Design Directive 548/2014. Comprehensive factory testing guarantees its high performance and reliability. For more information, please contact us.
Key Specifications
- Power Rating: 400 kVA
- Voltage Options:
6.3 kV Model: Primary 6.3 kV / Secondary 0.4 kV
20 kV Model: Primary 20 kV / Secondary 0.4 kV
- Cooling System: Natural air circulation
- Temperature Class: According to SR EN 60076-3
- Maximum Winding Over-temperature: 100°C
- Noise Level: 63 dB
- Insulation: A blend of epoxy resin and quartz powder for maintenance-free operation, moisture resistance, and fire safety.
- Core: Low-loss cold-rolled silicon steel with high magnetic permeability and minimal hysteresis and eddy current losses.
- Windings: Copper with epoxy resin insulation, providing high mechanical strength against short-circuit forces.
Technical Features
- Connection: Dyn-5
- Adjustment: Five-step adjustment with a ±2x2.5% range on the high-voltage side, performed when the transformer is de-energized.
- Insulation Level: F
- Environmental Conditions:
Maximum Ambient Temperature: +40°C
Minimum Ambient Temperature: -30°C
Altitude: <1200 meters
Humidity: <100% at 20°C
Seismic Resistance: 760±15 mmHg
Accessories
- Trolley: Includes bidirectional wheels with a locking mechanism.
- Temperature Sensors: At least three PT100 sensors.
- Temperature Control Unit: Integrated into the protection, signaling, and monitoring system
- Lifting Lugs: For easy handling
- Neutral Terminal: Accessible on the low voltage side for the 400 kVA, 6.3/0.4 kV transformer
Compliance
- Standards: EN 60076, CEI 60076 series, IEC 60185, DIN-VDE 0414-1
- ECO Design Directive: Fully compliant with Directive 548/2014 and its subsequent amendments.
Operational Flexibility
- Overload Capability:
10% overload for 1 hour
20% overload for 30 minutes
30% overload for 15 minutes
40% overload for 8 minutes
50% overload for 4 minutes
- Overexcitation Tolerance: Capable of operating with a maximum of 5% deviation from nominal voltage and frequency.
Testing
Each transformer undergoes comprehensive factory testing, including:
- Verification of transformation ratio
- Connection group validation
- Measurement of winding resistance
- Insulation resistance and absorption coefficient testing
- Dielectric loss angle tangent measurement
- Applied voltage and induced voltage tests
- Measurement of no-load and short-circuit losses
- Winding overheating and homopolar impedance measurement
- Noise level assessment
- Dielectric rigidity of the oil
For further details, technical support, or customized quotes, please contact our sales team. We are dedicated to delivering reliable, high-quality transformer solutions tailored to your specific needs. Reach out today to experience our outstanding service and expertise.
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