B21, China Town Mall, Midrand
500 kVA, 33/0.4 kV 50Hz Dyn11 ONAN Al Oil Immersed Transformer
- Section : Electrical & Tools
- Category : Transformers
- SKU : 1601012722131
500 kVA, 33/0.4 kV 50Hz Dyn11 ONAN Al Oil Immersed Transformer
The 500 kVA, 33/0.4 kV 50Hz Dyn11 ONAN Al Oil Immersed Transformer is a reliable and efficient power solution for various applications. This transformer ensures safe and effective voltage transformation for your electrical systems. Built with high-quality materials, it provides durability and performance you can trust.
Specifications
| Attribute | Details |
|---|---|
| Power Rating | 500 kVA |
| Primary Voltage | 33 kV |
| Secondary Voltage | 0.4 kV |
| Frequency | 50 Hz |
| Cooling Type | ONAN |
| Core Type | Dyn11 |
| Insulation Type | Al Oil Immersed |
Key Features
- High power capacity of 500 kVA.
- Efficient voltage transformation from 33 kV to 0.4 kV.
- Designed for a frequency of 50 Hz.
- Durable ONAN cooling system for effective heat dissipation.
- Dyn11 configuration ensures stable operation.
- Aluminum oil immersion for better insulation and performance.
Applications
- Power distribution in industrial settings.
- Electrical substations and feeder applications.
- Commercial buildings requiring reliable power supply.
- Renewable energy projects, such as solar or wind farms.
- Data centers needing efficient voltage management.
Product Info Gallery
- Shipping Timeframes: All orders are processed within 2-5 business days (excluding weekends and holidays). After your order has been processed, the estimated delivery time is before 03 Feb, 2026, depending on customs, Please note that due to high demand, some items may experience longer shipping times, which will be communicated at order confirmation email.
- Order Processing Time: Please allow 2-5 business days for us to process your order before it is shipped . Orders placed after 16:00 on Fridays, or during weekends and public holidays, will begin processing on the next business day. Processing times may be extended during peak seasons or sales events.
- Manufacturing Time: Some products needs manufacturing time, the manufacturing process will take approximately 10-30 business days depending on the product. This timeframe may vary depending on the complexity of the product and current demand. but this will be communicated with you during order confirmation.
- Returns and Exchanges: We offer a 30-day return policy for most items. If you are not completely satisfied with your purchase, you may return it within 30 days of receipt for a refund or exchange. Items must be unused, in their original packaging, and accompanied by proof of purchase. Return shipping costs are the responsibility of the customer, unless the item was damaged or defective upon arrival.
1. What are the basic electrical ratings of this transformer?
The transformer is rated 500 kVA with a primary (HV) voltage of 33 kV, secondary (LV) voltage of 0.4 kV, and designed for 50 Hz operation.
2. What does Dyn11 mean and why is it important?
Dyn11 is the vector group: D = delta connection on one side, y = star (wye) with neutral on the other, n = neutral available, and 11 indicates a 30° phase displacement between primary and secondary. This affects system grounding, parallel operation and protection coordination, so confirm compatibility with your network design.
3. What type of cooling does ONAN provide?
ONAN stands for Oil Natural Air Natural: heat is dissipated by natural convection of insulating oil inside the tank and natural air flow over the tank/radiators. It is suitable for continuous loads under normal ambient conditions without forced cooling equipment.
4. What does 'Al Oil Immersed' mean?
It indicates an oil-immersed transformer built using aluminum conductors/windings or aluminum components and insulated with transformer oil. Specifics (e.g., conductor material, oil type: mineral or biodegradable) should be confirmed with the manufacturer or datasheet.
5. What protection devices and accessories are recommended/available?
Common accessories include conservator tank with breather, oil level gauge, Buchholz relay, pressure relief valve, temperature gauges/thermostats, HV/LV bushings, surge arresters, and earthing provisions. On-request options may include on-load tap changers (OLTC), forced cooling (ONAF/ONAF+), and remote monitoring.
6. Can this transformer be paralleled with others?
Parallel operation is possible if transformers have the same vector group, similar percent impedance, phase shift, and compatible ratings. For Dyn11 units, ensure identical vector group and follow manufacturer guidance on impedance matching and protection coordination.
7. What routine tests are performed before delivery?
Typical factory tests include winding resistance, voltage ratio, no-load (excitation) test, short-circuit impedance and load loss test, insulation (power-frequency) test, and visual/functional checks. Type tests (impulse, temperature rise, noise) are available per standards on request.
8. What maintenance is required for an oil-immersed ONAN transformer?
Regular maintenance includes periodic visual inspections, oil level and breather checks, sampling and testing of insulating oil (DGA, moisture, acidity), monitoring temperature and cooling surfaces, checking for leaks and tightening connections. Follow the manufacturer’s maintenance schedule for frequency and specific procedures.
9. Are there environmental or site limitations (altitude, ambient temperature)?
Performance can be affected by high ambient temperatures and high altitude. ONAN cooling assumes moderate ambient conditions; derating may be required above specified ambient/altitude limits. Obtain manufacturer derating curves for precise guidance.
10. What safety and grounding measures are required during installation?
Install on a suitable foundation, use specified lifting points, provide solid earthing/grounding for tank and neutral, install surge protection, and follow lock-out/tag-out procedures during commissioning. All work should be performed by qualified personnel per local electrical codes and standards.
11. How long is expected service life and what warranty is typical?
Service life of a well-maintained oil-immersed power transformer is commonly several decades (20–40+ years), depending on loading, environment and maintenance. Warranty terms (duration and coverage) vary by manufacturer and should be confirmed at purchase.
12. What testing or checks are recommended after installation and before energization?
Perform post-installation checks: insulation resistance, ratio and polarity test, winding resistance, continuity, proper grounding, oil level and breather condition, bushing integrity, and functional checks of protective devices. Carry out a controlled energization and monitor temperatures and oil behavior.
13. Can the transformer handle short-term overloads?
Oil-immersed ONAN transformers can tolerate short-term overloads within manufacturer-specified limits (temperature rise and thermal capability). Exact overload capacity and permissible durations must be obtained from the manufacturer’s thermal/overload curves.
14. How do I obtain detailed dimensional, weight and lifting data?
Detailed mechanical drawings, weights, center-of-gravity, lifting points and foundation bolt layouts are provided by the manufacturer or in the product datasheet. Request the mechanical package before planning transport and installation.
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