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Jinhua Dika Electrical Equipment Co., Ltd., a professional manufacturer with over 15 years of experience in power transformer manufacturing, proudly presents our 110kV/11kV Three Phase Power Transformer (5-63MVA, ONAN Oil Self Cooling with Tap Changer). This transformer is engineered to deliver reliable and efficient power distribution for utility, industrial, and renewable energy applications. With annual export value exceeding US$1 Million and a dedicated team of 11–50 skilled employees, we combine advanced manufacturing techniques with rigorous quality control to ensure every unit meets the highest international standards. Our transformers are shipped globally via major Chinese ports including Shanghai, Ningbo, Tianjin, and Guangzhou, serving markets across North America, Europe, Asia, Africa, and Oceania.
This three-phase transformer is designed for step-down applications from 110kV to 11kV, covering a capacity range of 5MVA to 63MVA. The ONAN (Oil Natural Air Natural) cooling system eliminates the need for external fans or pumps, ensuring low maintenance and silent operation. Equipped with a tap changer, the transformer allows voltage regulation to compensate for load variations, improving system stability. Built with high-grade cold-rolled grain-oriented silicon steel cores and copper windings, it offers low no-load losses and high short-circuit withstand capability.
Key Features & Benefits
- Robust ONAN Cooling: Oil self-cooling design with tubular radiators ensures efficient heat dissipation without auxiliary power, reducing operating costs.
- Tap Changer Flexibility: Available with off-circuit or on-load tap changer (optional) for ±5% or ±10% voltage regulation, adapting to grid requirements.
- High Efficiency: Minimal load and no-load losses due to optimized core design and high-quality materials, leading to long-term energy savings.
- Excellent Short-Circuit Performance: Reinforced winding structure and clamping system withstand short-circuit forces, ensuring reliability under fault conditions.
- Customizable Specifications: Frequency (50/60Hz), impedance, and tap range can be tailored to client’s grid parameters.
- Durable Insulation System: Class A or Class B insulation with premium transformer oil (mineral or ester-based, optional) for extended service life.
- Global Compliance: Designed to meet IEC 60076, ANSI C57, or other applicable standards (certifications available upon request).
Technical Specifications (Typical)
| Parameter | Value / Range |
|---|---|
| Rated Power | 5, 10, 20, 31.5, 40, 50, 63 MVA (other values on request) |
| Voltage Ratio | 110 kV / 11 kV (or custom) |
| Cooling Method | ONAN (Oil Natural Air Natural) |
| Tap Changer | Off-circuit (standard) or On-load (optional), typically ±5% in 5 steps |
| Frequency | 50 Hz / 60 Hz |
| Phase | 3 |
| Winding Connection | YNd11 (standard), other vector groups available |
| Insulation Level | LI 480 kV / AC 200 kV (primary side typical) |
| Noise Level | ≤ 75 dB(A) (depending on rating) |
Why Choose Jinhua Dika?
Jinhua Dika Electrical Equipment Co., Ltd. is committed to delivering reliable and cost-effective power transformers. Our factory, located in Jinhua, Zhejiang (China), is equipped with advanced winding machines, core cutting lines, and testing facilities including a high-voltage test laboratory. We adhere to a strict ISO9001:2015 quality management system (company certified) and follow rigorous inspection processes – from raw material incoming to final routine tests (ratio, insulation resistance, induced voltage, partial discharge). Our annual export value of US$1–1.5 million reflects growing trust from international clients. We have successfully supplied transformers to projects in North America, Europe, Southeast Asia, Africa, and the Middle East. Each transformer is backed by a standard warranty of 12–24 months, with after-sales technical support available.
Take the next step! Whether you need a standard 20MVA transformer for a substation upgrade or a custom 63MVA unit for a solar farm, our engineering team can provide a solution tailored to your grid code. Contact us for a detailed quotation, technical datasheet, or homologation documents. We look forward to becoming your trusted transformer partner.
Frequently Asked Questions (FAQ)
Q1: What is the typical lead time for a 110/11kV transformer?
A: Standard lead time is 8–12 weeks after receiving your order and technical specifications. For rush orders, please contact our sales team for an expedited schedule.
Q2: Can this transformer be used for step-up applications (11kV to 110kV)?
A: Yes, the design is reversible. The same core and winding structure can be configured for step-up or step-down. Please specify your required voltage ratio when ordering.
Q3: What type of oil do you use? Can we specify synthetic ester oil?
A: We standardly use mineral transformer oil (IEC 60296 compliant). Synthetic ester oil (e.g., for fire safety or eco-sensitive areas) is available as an option upon request.
Q4: Does the ONAN cooling system work in high ambient temperatures?
A: Yes. Our radiators are sized for ambient temperatures up to 50°C (customizable). For extreme tropical conditions, we can increase radiator surface or add forced oil circulation (ONAF) as an option.
Q5: What certifications do you have for this product?
A: Our factory is ISO9001 certified and we can provide type test reports from an accredited third-party laboratory upon request. Specific certifications (e.g., IEC, ANSI, GOST) are available depending on the destination market – please inquire.
Q6: What is the warranty period?
A: We offer a standard warranty of 12 months from commissioning or 18 months from shipment, whichever comes first. Extended warranty up to 24 months is negotiable.
Q7: Can you provide on-site installation and commissioning support?
A: Yes, we can arrange for our engineers to supervise installation and commissioning, or provide remote guidance. Additional costs apply for travel and accommodation.
Q8: What is the noise level at rated load?
A: Typical noise level for a 20MVA ONAN transformer is around 70–75 dB(A) at 1 meter, measured per IEC 60076-10. Lower noise levels can be achieved with optional sound enclosures.
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