150 kV 250 MVA Power Transformer
- Primary Voltage Ratings: 150kV
- Secondary Voltage Ratings: 18kV
- CONNECTION TYPE: YNd11
- BIL: 550/125kV
- Standards: EN60076
- Power Rating: 250MVA
- Cooling Method: OFAF
The 250 MVA Step-Up Transformer, designed for outdoor use with a high voltage of 150 kV and low voltage of 18 kV, featuring a 35 kV neutral winding. It includes an OFAF cooling system with hinged coolers and separate control cabinets. Key safety features include a gas relay, oil level indicator, and maintenance-free drying air system. Built to EN 60076-1 standards, it supports high-performance and reliability with seismic stability and precise temperature controls. Ideal for robust energy solutions in demanding environments.
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Introducing our advanced 250 MVA Step-Up Transformer, designed for robust outdoor installations and built to meet the highest standards of performance and reliability. This three-phase, oil-immersed transformer features a high voltage rating of 150 kV and a low voltage rating of 18 kV, with a unique 35 kV neutral winding, and is engineered according to the EN 60076-1 standard.
Key Specifications:
- Power Rating: 250 MVA
- High Voltage (HV): 150 kV
- Low Voltage (LV): 18 kV
- Neutral Winding: 35 kV
- Cooling Type: OFAF (Oil Forced Air Forced)
- Cooling System Layout:
- Coolers: Hinged
- Connection Cabinet: Hinged
- Cooling System Control Cabinet: Separate from the transformer tank
- Cooling System Control Cabinet Features:
- Power Supply: Dual-source with automatic switch
- Protection: Circuit breakers for fan motors and oil pump
- Temperature Maintenance: Automatic, climate-controlled
- Degree of Protection: IP55 (GOST 14254-96 / IEC 60529:2013)
- Alarm: Door opening and current protection
Voltage Ratings and Withstand Capacities:
- Full Wave Lightning Impulse (LI):
- HV: 550 kV (peak)
- LV: 125 kV (peak)
- Chopped Wave Lightning Impulse (LIC):
- HV: 600 kV
- LV: 150 kV
- Short-Duration Power-Frequency Withstand Voltage (1 min, rms):
- HV (ph-ground/ph-ph): 230/275 kV
- LV: 50 kV
- Neutral HV: 85 kV
Embedded Current Transformers (CTs):
-
HV CTs:
- Rated Primary Current: 750-1000-1500-2000 A
- Rated Secondary Current: 5 A
- Accuracy: 10P
- Accuracy Limit Factor (ALT/FS): 25
- Rated Secondary Load: 30 VA
- Quantity: 2 per bushing
-
Neutral CTs:
- Rated Primary Current: 200/300/400/600 A
- Rated Secondary Current: 5 A
- Accuracy: 10P
- Accuracy Limit Factor (ALT/FS): 25
- Rated Secondary Load: 30 VA
- Quantity: 2 per bushing
Bushing and Connection Details:
- 150 kV HV: Bushings with hard insulation RIP and external silicon insulation
- 35 kV Neutral: Bushings with hard insulation RIP and external silicon insulation
- 18 kV LV: Oil-air, porcelain
- Bushing Testing: Cantilever load test as per IEC 60137
- Contact Parts: Equipped for flexible stranded connections
Safety and Maintenance Features:
- Gas Relay: Signals gas emission and shuts down the transformer in case of low oil level or accelerated oil flow
- Oil Level Indicator: Remote-controlled with signal contacts for maximum and minimum levels
- Drying Air System: Maintenance-free intelligent dehumidifier
- Shut-Off Valve: Includes valve position signaling and indicator
- Safety Valves: Two valves with operation signaling contacts
Performance and Environmental Specifications:
- Transformer Performance Coefficient (PEI): Meets ecodesign level 2 requirements
- Temperature Tolerances:
- Oil in Upper Layers: ≤ 60°C
- Average Winding Temperature: [Temperature not specified]
- Hottest Winding Part: [Temperature not specified]
- Ambient Air Temperature:
- Maximum Operating: +45°C
- Minimum Operating: -40°C
- Annual Average: ≤ +20°C
- Degree of Air Pollution: Class 3 (PUE-2017 or equivalent)
- Seismic Stability: MSK-64 points, not less than 6
- Installation Altitude: Up to 1000 m above sea level
Physical Dimensions:
- Length: 6500 mm
- Width: 3000 mm
- Height: 4200 mm
Weight:
- Transport: 148 t
- Full: 172 t
- Oil: 26 t
- Active Part: 127 t
- Removable Tank Part: 16 t
This 250 MVA Step-Up Transformer combines high performance, reliability, and advanced technology to meet the demanding needs of modern electrical grids. For more information or to schedule a consultation, please contact us.
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