400 kVA Dry Transformer

Primary Voltage Ratings: 6.3kv or 20 kV
Secondary Voltage Ratings: 0.4kV
TYPE: Cast resin
Standards: EN60076
Application: CHE Scropoasa substation
Power Rating: 400kVA
Cooling Method: Natural air circulation

The 400 kVA Dry Transformer is designed for the 6.3 kV and 20 kV CHE Scropoasa substation modernization. It features maintenance-free epoxy resin insulation, low-loss silicon steel core, and copper windings. It operates with natural air cooling, supports ±2x2.5% voltage adjustment, and meets EN 60076 standards. Accessories include a bidirectional trolley, temperature sensors, and integrated temperature control. The transformer handles significant overloads and complies with ECO Design Directive 548/2014. Factory tests ensure high performance and reliability. For more details, contact our sales team.

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Overview: The 400 kVA Dry Transformer is designed for the modernization of the 6.3 kV and 20 kV CHE Scropoasa substation. This high-performance, three-phase transformer operates without protective casing and features a durable, maintenance-free construction, ideal for supplying 0.4 kV AC services in a 50 Hz environment.

Key Specifications:

Power Rating: 400 kVA
Voltages:
- 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 Overtemperature: 100°C
Noise Intensity: 63 dB
Insulation: Epoxy resin and quartz powder blend for maintenance-free operation, moisture resistance, and fire safety.
Core: Low-loss cold-rolled silicon steel with high magnetic permeability and low hysteresis and eddy current losses.
Windings: Copper with epoxy resin insulation; high mechanical strength against short-circuit forces.

Technical Features:

Connection: Dyn-5
Adjustment: 5-step voltage adjustment with ±2x2.5% range on the high voltage side, performed in the absence of voltage.
Insulation Level: F
Environmental Conditions:
- Maximum Ambient Temperature: +40°C
- Minimum Ambient Temperature: -30°C
- Altitude: <1200 meters
- Humidity: <100% at 20°C
- Seismicity: 760±15 mmHg

Accessories:

Trolley: With bidirectional wheels and a wheel locking device
Temperature Sensors: At least 3 PT100
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: Compliant with 548/2014 and 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 5% maximum deviation from nominal voltage and frequency.

Testing

All transformers undergo rigorous factory testing, including:

Verification of transformation ratio
Connection group checking
Winding resistance measurement
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 detailed information, technical queries, or to request a customized quote, please reach out to our dedicated sales team. We are committed to providing top-notch, reliable transformer solutions that meet your specific requirements. Contact us today to experience our exceptional service and expertise.