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As a professional manufacturer with over a decade of experience in electrical equipment, Jinhua Dika Electrical Equipment Co., Ltd. proudly presents our high-performance 1000KVA 11kV ONAN Cooling Oil-Immersed Power Transformer. Engineered for reliability and efficiency in demanding power distribution and transmission networks, this transformer is a core component for utilities, industrial plants, and large commercial facilities. Our commitment to stringent quality management, evidenced by our ISO certifications, ensures every unit delivers stable voltage transformation, long operational life, and minimal maintenance requirements, providing a solid foundation for your electrical infrastructure.
Our 1000KVA transformer is designed to handle significant electrical loads with precision and safety. The ONAN (Oil Natural Air Natural) cooling system is a time-tested, reliable method where heat from the core and windings is naturally dissipated through the insulating oil and then to the surrounding air via radiators. This passive cooling design offers several key advantages:
- High Reliability: No moving parts like fans or pumps in the primary cooling circuit, leading to reduced failure points and lower maintenance costs.
- Quiet Operation: The absence of forced-air cooling fans results in significantly lower operational noise, making it suitable for installations near populated areas.
- Robust Construction: The oil-immersed design provides excellent insulation and cooling properties, protecting the core and windings from environmental contaminants and moisture.
The transformer is built with a high-grade magnetic core made from grain-oriented silicon steel laminations, which minimizes no-load losses and improves overall energy efficiency. The windings, available in copper or high-conductivity aluminum based on customer preference, are carefully designed and constructed to handle the rated current and short-circuit stresses. Key technical specifications and optional features are detailed below:
| Parameter | Specification / Option |
| Rated Power | 1000 kVA |
| High Voltage (HV) | 11 kV (Other voltages available) |
| Low Voltage (LV) | 0.4 kV / 0.433 kV (Standard) |
| Frequency | 50 Hz / 60 Hz |
| Vector Group | Dyn11, Yyn0, or others |
| Insulation Liquid | Mineral Oil or Biodegradable Ester Fluid (Optional) |
| On-Load Tap Changer (OLTC) | Optional for voltage regulation |
For clients, the primary benefits translate into tangible operational savings and peace of mind. The energy-efficient design reduces electricity losses over the transformer's lifetime, lowering your total cost of ownership. Its durable construction ensures high availability and reduced downtime, critical for continuous industrial processes. Furthermore, the design allows for flexibility in installation, suitable for both outdoor substations and indoor vaults with proper ventilation. We also offer comprehensive customization, including specific impedance values, special paint finishes for corrosive environments, and integration of monitoring devices like temperature gauges and Buchholz relays.
Choosing Jinhua Dika means partnering with a certified manufacturer whose products are trusted in diverse global markets, from North America and Western Europe to Southeast Asia and Africa. Our annual export volume and presence across multiple continents demonstrate our capability to meet international standards and logistical demands. We ship efficiently from major Chinese ports like Shanghai, Tianjin, Guangzhou, and Ningbo. With a dedicated team of 11-50 professionals focused on quality and customer service, we ensure your 1000KVA transformer is not just a purchase but a long-term investment in reliable power. Contact us today to discuss your project specifications and receive a detailed quotation tailored to your needs.
Frequently Asked Questions (FAQ)
Q1: What does ONAN cooling mean, and why is it suitable for my application?
A1: ONAN stands for Oil Natural Air Natural. It describes a self-cooling method where oil circulates naturally due to temperature differences (thermosiphon effect), and heat is dissipated from the radiator surfaces by natural airflow. It's highly suitable for applications where reliability is paramount, and noise must be minimized, such as in urban substations or facilities without a guaranteed external power source for cooling fans.
Q2: Can this transformer be used for both step-up and step-down applications?
A2: Yes, power transformers are generally bidirectional. This 11kV/0.4kV unit is typically used for stepping down voltage from a distribution line (11kV) to a utilization voltage (400V). However, the design principles allow it to be used in reverse as a step-up transformer, though the nameplate ratings and protection schemes should be confirmed for such operation.
Q3: What are the delivery and installation considerations?
A3: Delivery time depends on customization and order volume. The transformer is shipped filled with oil or dry, as required. Installation requires a level, solid foundation. We provide detailed installation manuals and can offer technical guidance. It's crucial to plan for adequate clearance for cooling and safety, as specified in local electrical codes.
Q4: Do you offer different types of insulating oil?
A4: Yes. Standard units are filled with high-quality mineral oil. Upon request, we can fill the transformer with biodegradable and less-flammable ester-based fluids, which are advantageous for environmentally sensitive or high-fire-risk locations.
Q5: What kind of after-sales support and warranty do you provide?
A5: We offer a standard warranty covering manufacturing defects. Our support includes providing technical documentation, spare parts availability, and remote troubleshooting assistance. For larger projects, on-site commissioning support can be arranged.
Q6: How do I determine if 1000KVA is the right capacity for my load?
A6: Transformer sizing requires a detailed analysis of your connected load, diversity factor, and future expansion plans. Our engineering team can assist you with this calculation based on your provided load profile to ensure optimal and efficient transformer selection.
Q7: Are your transformers compliant with international standards like IEC or IEEE?
A7: Our manufacturing process adheres to a certified quality management system. We design and build transformers to meet the core requirements of major international standards such as IEC 60076 and IEEE C57.12.00. Specific compliance certificates for a particular standard can be discussed and provided as per your project's contractual requirements.
Q8: Can you customize the transformer's color and accessories?
A8: Absolutely. The tank color can be customized to match your site requirements. We can also equip the transformer with various accessories, including pressure relief devices, silica gel breathers, temperature indicators, and remote monitoring terminals, to enhance functionality and safety.
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