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Help CenterThree Phase Power Transformer 5-63MVA 110kV-11kV ONAN Oil Losses Guaranteed Efficiency
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Welcome to Jinhua Dika Electrical Equipment Co., Ltd. — a professional manufacturer specialized in power transformers with over a decade of experience. Our Three Phase Power Transformer 5-63MVA 110kV-11kV ONAN Oil Losses Guaranteed Efficiency is engineered to deliver reliable performance for high-voltage substations, industrial plants, and utility grids. Built with premium cold-rolled silicon steel cores and high-grade copper windings, this transformer ensures low no-load and load losses, meeting the stringent efficiency requirements of modern power systems. Whether you need a unit for step-down distribution or step-up transmission, our design guarantees optimized energy transfer and minimal operational costs.
This transformer series is available from 5 MVA to 63 MVA, with primary voltage up to 110 kV and secondary voltage of 11 kV (other custom voltage combinations are available upon request). The ONAN (Oil Natural Air Natural) cooling system ensures natural convection cooling without external fans, making it highly reliable, maintenance-friendly, and suitable for outdoor installation. Every unit undergoes strict quality control based on IEC 60076 and GB/T 6451 standards, with guaranteed loss values as per design specifications.
Key Features & Technical Specifications
- High Efficiency & Low Losses: Optimized core design with grain-oriented silicon steel reduces no-load losses; copper windings with precise inter-layer insulation minimize load losses. Loss values are guaranteed within ±5% of declared data.
- Robust Insulation System: High-grade transformer oil (mineral oil or alternative upon request) combined with vacuum-dried cellulose insulation ensures excellent dielectric strength and long service life.
- Compact & Durable Tank: Fabricated from carbon steel or stainless steel with anti-corrosion coating, designed to withstand pressure variations and environmental conditions. Equipped with conservator, Buchholz relay, oil level gauge, and temperature indicators.
- Flexible Connection Options: Standard connection group YNd11 (other groups like YNyn0 or Dyn11 available), with fully sealed bushings for 110 kV and 11 kV sides.
- Comprehensive Protection Accessories: Includes pressure relief device, magnetic oil gauge, winding temperature indicator, and oil temperature controller (optional RTD/PT100 sensors for remote monitoring).
| Parameter | Value |
|---|---|
| Rated Power (MVA) | 5 / 10 / 20 / 31.5 / 40 / 50 / 63 |
| HV Rating (kV) | 110 (115 or 121 optional) |
| LV Rating (kV) | 11 (6.3, 10.5 optional) |
| Cooling Type | ONAN (Oil Natural Air Natural) |
| No-Load Loss (kW) | Guaranteed per design (e.g., 12-25 kW for 20 MVA) |
| Load Loss (kW) at 75°C | Guaranteed per design (e.g., 70-120 kW for 20 MVA) |
| Impedance Voltage (%) | 10-15% (adjustable as per requirement) |
| Insulation Level (HV/LV) | LI 480 / AC 230 (60 Hz) – customizable |
Each transformer is subjected to routine tests including: ratio measurement, winding resistance, insulation resistance, dielectric test (induced voltage & lightning impulse), and load loss measurement. Type tests (temperature rise, vacuum, pressure) are conducted per sample or upon customer request. Our factory in Jinhua, Zhejiang operates with a professional team of 11-50 employees and maintains rigorous quality management systems. We hold certifications such as ISO9001, ISO14000, OHSAS18001 and comply with international standards, ensuring consistent product quality.
Why Choose Our Transformer?
- Cost-effective Operation: Guaranteed low losses translate into significant energy savings over the transformer’s 20+ year lifespan.
- Customizable Design: We offer custom voltage ratios, tap ranges (±5% to ±10%), impedance variations, and special bushings or enclosures.
- Reliable After-sales Support: Our export network covers North America, Europe, Southeast Asia, Africa, and Oceania. We provide technical documentation, installation guidance, and responsive communication.
- Competitive Lead Time: As a manufacturer, we control production directly – typical delivery is 45-60 days depending on capacity.
Trust and Credibility: Jinhua Dika Electrical Equipment Co., Ltd. has been a reliable OEM/ODM partner for global clients. With an annual export value of US$1–1.5 million and shipments through major Chinese ports (Shanghai, Tianjin, Guangzhou, Ningbo), we ensure safe and timely delivery. Our products have been deployed in substations and industrial projects across South America, Eastern Europe, the Middle East, and Africa. We are committed to transparency — loss values and performance data are guaranteed as per our technical proposal. Contact us today to discuss your specific voltage, capacity, and cooling requirements. Let our engineering team tailor the perfect solution for your grid.
Frequently Asked Questions (FAQ)
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Q: What is the typical efficiency of your 20 MVA 110/11 kV transformer?
A: Efficiency depends on load level, but at full load (with guaranteed losses) it typically exceeds 99.5%. We provide loss data for both no-load and load conditions so you can calculate exact efficiency per your operating profile. -
Q: Can you offer alternative cooling like OFAF or ONAF?
A: Yes, while ONAN is standard for this series, we can upgrade to ONAF (with fans) or OFAF (forced oil) to increase capacity or reduce size. Please specify your requirement when ordering. -
Q: Do you provide on-site commissioning support?
A: We offer technical guidance and documentation. For international projects, we can arrange on-site supervision by our engineers at an additional cost. Remote support via video call is included. -
Q: What is the warranty period for your transformer?
A: Standard warranty is 12 months from installation or 18 months from shipment, whichever comes first. Extended warranty options are available. -
Q: Can the transformer be designed for 60 Hz systems?
A: Absolutely. Our transformers are designed for both 50 Hz and 60 Hz. The core flux and loss calculations are adjusted accordingly. Please confirm your frequency when placing order. -
Q: Are your transformers compliant with IEC or ANSI standards?
A: Yes, we design according to IEC 60076 as standard. We can also adapt to ANSI/IEEE C57.12.00 or other local standards upon request. -
Q: What type of oil do you use? Is it biodegradable oil available?
A: We use high-grade mineral oil (IEC 60296 compliant). Biodegradable ester oil (natural or synthetic) is available as an option for environmental-sensitive areas. -
Q: How long does it take to manufacture and deliver a 40 MVA unit?
A: Typical production time is 8-10 weeks after receiving the deposit and finalizing technical specifications. Shipping time depends on port and mode of transport.
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