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Help CenterThree Phase Power Transformer 5-63MVA 110kV/11kV ONAN Oil-Immersed Self-Cooled for Substation
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Welcome to Jinhua Dika Electrical Equipment Co., Ltd. – a reliable manufacturer with 11–50 dedicated employees and annual export value of US$1–1.5 million. Our Three Phase Power Transformer 5-63MVA 110kV/11kV ONAN Oil-Immersed Self-Cooled for Substation is engineered to meet the rigorous demands of modern power grids. Combining decades of manufacturing expertise with advanced quality management systems (ISO 9001, ISO 14000, OHSAS 18001), we deliver transformers that ensure stable voltage transformation, low losses, and long service life. Whether for utility substations, industrial plants, or renewable energy integration, this transformer series offers exceptional reliability and cost-effectiveness.
Designed for ONAN (Oil Natural Air Natural) self-cooling, the transformer operates without forced cooling equipment, reducing maintenance and energy consumption. Its robust oil-immersed construction provides superior insulation and heat dissipation, making it suitable for both indoor and outdoor substations. With a power range from 5 MVA to 63 MVA and a voltage ratio of 110 kV/11 kV, it is ideal for stepping down high transmission voltages to distribution levels.
Key Features & Technical Specifications
- High Efficiency: Core made of high-grade grain-oriented silicon steel with low hysteresis and eddy current losses, achieving efficiency up to 99.5%.
- Reliable Insulation: Oil-immersed paper insulation system with vacuum drying and oil impregnation, ensuring dielectric strength and partial discharge suppression.
- Robust Tank Design: Corrugated tank with conservator, breather, and Buchholz relay for protection; optional sealing with nitrogen or oil preservation system.
- Flexible Tapping: Off-circuit tap changer (standard) with ±10% regulation; on-load tap changer available upon request for voltage control under load.
- Safety & Durability: Equipped with pressure relief device, temperature indicators, and oil level gauge; tank meets IP55 protection rating.
- Compliance: Manufactured according to IEC 60076, GB 1094, and other international standards; certified with ISO 9001, ISO 14000, OHSAS 18001, and additional quality systems (TS16969, SA8000 etc.).
| Parameter | Specification |
|---|---|
| Rated Power | 5 MVA, 10 MVA, 20 MVA, 31.5 MVA, 40 MVA, 50 MVA, 63 MVA |
| Voltage Levels (HV/LV) | 110 kV / 11 kV (other ratios customizable) |
| Cooling Method | ONAN (Oil Natural Air Natural) |
| Frequency | 50 Hz / 60 Hz |
| Winding Material | Copper (standard) / Aluminum (optional) |
| Tapping Range | ±5% to ±10% (off-circuit or on-load) |
| Impedance Voltage | 10% - 12% (typical, adjustable per design) |
| Noise Level | ≤ 60 dB(A) at rated conditions |
Advantages for Your Substation
- Lower Total Cost of Ownership: ONAN cooling eliminates fans and pumps, reducing auxiliary power and maintenance costs. High-efficiency core and copper windings minimize no-load and load losses.
- Enhanced Reliability: Oil-immersed design provides excellent thermal stability and overload capability. Proven in harsh environments from tropical to temperate climates.
- Easy Installation & Operation: Fully assembled and tested before shipment; simple foundation and no external cooling piping required. Compatible with standard substation monitoring systems.
- Customization: Voltage ratios, tap changers, accessories (CT, bushing, oil conservator) can be tailored to your project specifications.
Trust & Credibility
As a manufacturer with 11–50 skilled professionals and annual export value exceeding US$1 million, Jinhua Dika Electrical Equipment Co., Ltd. has supplied transformers to markets across North America, South America, Europe, Southeast Asia, Africa, the Middle East, and Oceania. Our products are backed by multiple international quality certifications including ISO 9001, ISO 14000, OHSAS 18001, SA8000, TL900, QS9000, and ISO 16949, ensuring compliance with global standards. We ship from major Chinese ports (Shanghai, Tianjin, Guangzhou, Ningbo) with reliable logistics and on-time delivery.
Why Choose Us? Our technical team provides full engineering support, from design review to commissioning. We offer a standard 2-year warranty (extendable) and fast response for spare parts. With a proven track record in substation projects worldwide, we invite you to contact us for a quotation or technical discussion.
Frequently Asked Questions
-
What is the typical lead time for a 20 MVA transformer?
Lead time depends on design and materials; typically 8–12 weeks after order confirmation. Custom designs may require 14–16 weeks. -
Can the transformer be used for indoor substations?
Yes, with proper ventilation and fire safety measures. Oil-immersed transformers require a containment pit and fire protection; we can provide guidance based on local codes. -
What are the available tap changer options?
Standard is off-circuit tap changer (DETC) for voltage adjustment when de-energized. On-load tap changer (OLTC) is available as an option for voltage regulation under load. -
Do you provide cooling upgrades (e.g., ONAF) if needed?
Yes, our design can be modified to include forced oil and forced air cooling (ONAF or OFAF) for increased capacity upon request. -
What quality tests are performed before shipment?
Each transformer undergoes routine tests per IEC 60076: winding resistance, turns ratio, insulation resistance, dielectric tests, no-load and load loss measurement, temperature rise, and partial discharge measurement for HV units. -
Can you supply transformers for 60 Hz systems?
Absolutely. Our transformers are designed for both 50 Hz and 60 Hz; please specify your frequency during inquiry. -
What are the payment terms?
Standard is 30% T/T deposit, 70% against copy of shipping documents. L/C at sight is also accepted for certain markets. -
Do you offer after-sales support and spare parts?
Yes, we maintain a stock of common spare parts (gaskets, bushings, tap changer contacts) and provide remote technical support. Our team can also arrange on-site commissioning assistance.
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