The SZ-12500-37 is a high-efficiency 12.5MVA power transformer designed for 37kV/xxkV voltage conversion, compliant with IEC 60076 and IEEE C57.12 standards.
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SZ-12500-37
The 37kV power transformer SZ-12500-37 is a high-capacity 12.5MVA electrical solution engineered for precision voltage conversion in industrial and utility grid systems. Compliant with global IEC 60076 and IEEE C57.12 standards, this step-down transformer features a low-loss grain-oriented silicon steel core with no-load loss ≤18kW and an efficiency rating exceeding 99.1%, delivering ultra-low energy waste for large-scale power users. Equipped with dual ONAN/ONAF cooling technology, it operates stably in extreme temperatures from -30°C to +45°C, with a 6.5% short-circuit impedance that bolsters grid stability even under high-load conditions. Designed for a 35+ year lifespan, the SZ-12500-37 transformer offers customizable secondary voltage configurations, making it a versatile core component for industrial plants, distribution substations and heavy-duty power infrastructure worldwide.

Advanced silicon steel core technology cuts no-load losses to 18kW max, driving 10% lower operating costs than industry benchmarks and supporting sustainable energy management for industrial operators.
Integrated OLTC (On-Load Tap Changer) with ±2×2.5% tapping range ensures real-time voltage adjustment, eliminating downtime for tap changes and maintaining consistent power supply for high-precision industrial equipment.
Dual cooling systems and reinforced tank construction enable operation in harsh conditions, with a 65K winding temperature rise tolerance and resistance to vibration, dust and corrosive air.
35+ year design life reduces capital expenditure for replacement and maintenance, with optional DGA (Dissolved Gas Analysis) monitoring for predictive fault detection and minimized unplanned downtime.
| Type | Step downpower transformer |
| Model | SZ-12500-37 |
| Cooling Method | ONAN |
| Primary Voltage | 37kV |
| Rated Frequency | 50HZ |
| Rated Power | 12.5MVA |
| Winding Material | Copper |
| Voltage Regulation | OLTC |
| Tapping Range | ±2×2.5% |
| Connection Group | YNd11 |
| Transformer Dimension | 6200×5200×5920mm |
| Weight | 60000kg |
The 37kV 12.5MVA transformer is optimized for high-power, high-reliability scenarios across key industries:
Industrial Power Distribution: Powers steel mills, chemical plants and manufacturing facilities with harmonic-rich loads, 30+ units deployed in Southeast Asian heavy industry.
Renewable Energy Integration: Collects power from solar/wind farms, accommodating generation fluctuations with OLTC; 15+ installations in Australian solar farms with 99.2% availability.
Urban Substations: Compact design and <65dB noise level suit residential-adjacent city substations, deployed in 8+ Asian megacity projects.
Mining Operations: Explosion-proof construction meets mining safety standards, operating at 3,000m altitude in Chilean copper mines with optional -40°C cold-start package.
Oil & Gas Facilities: Zone 2 hazardous area certification and anti-corrosion treatment for offshore platforms and refineries, 5 units running 24/7 in Middle Eastern oil fields for 5+ years.
This 37kV industrial transformer holds global certifications including UL/cUL, CE, and adheres to IEC, IEEE and GB 1094 standards, ensuring compatibility with power grids worldwide. Every unit undergoes rigorous factory testing for short-circuit resistance, insulation performance and cooling efficiency, with a full inspection and handover test protocol before delivery. YAWEI provides comprehensive quality documentation, including material certificates and performance test reports, for seamless regulatory compliance in industrial and utility projects.
30+ Years of Transformer Expertise: Specialized manufacturing for high-voltage power equipment, with ODM/OEM capabilities for global industrial clients.
99.5% On-Time Delivery Rate: 14-week lead time for custom configurations, ensuring project timelines are met for large-scale infrastructure builds.
Extreme Climate Customization: Tailored designs for cold, hot, corrosive and high-altitude environments, with dedicated engineering support for unique project requirements.
Extended Warranty & Support: 2-year standard extended warranty, plus lifelong technical consultation and maintenance guidance for industrial operators.
Global Installation Network: Localized support for on-site assembly, commissioning and training, reducing implementation complexity for international clients.
Generic installation and use instructions for 110kV class power transformers, containing the following sections:
1. Lifting and jacking of transformer body
2. Transportation and handling
3.Check and acceptance
4.Storage and keeping of product (body and component)
5.Overall reassembly on site
6.Vacuum oil filling: vacuum oil filling must be conducted after general assembly of the transformer has been fully completed.
7.External surface cleaning and painting makeup of transformer
8.Check and handover test before commissioning
9.Operation
10. Inspection and maintenance
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