This series of ONAN Cooling Oil-Immersed Transformers adopts low-loss silicon steel cores and high-purity copper windings, matched with fully sealed anti-corrosion fuel tanks and high-quality insulating oil. Driven by temperature difference, the insulating oil realizes natural closed-loop circulation and dissipates heat passively through radiators without auxiliary power equipment. Integrated with voltage regulation, pressure relief, temperature monitoring and oil level detection functions, it maintains stable temperature rise under long-term stable load conditions. With excellent dustproof, moisture-proof and weather resistance, it requires no cooling control system, featuring easy installation and ultra-low failure rate for conventional civil and industrial terminal power distribution.
Product Parameters
|
Parameter |
Value |
|
Cooling Method |
ONAN (Oil Natural, Air Natural), passive cooling without forced air |
|
Rated Voltage |
11kV/0.4kV, 33kV/11kV optional |
|
Rated Capacity |
30kVA～6300kVA |
|
Temperature Rise Limit |
Winding ≤65K, Oil ≤55K |
|
Short Circuit Impedance |
4%～6.5% (national standard matching) |
|
Voltage Regulation |
Off-circuit tap changer, ±2×2.5% adjustable gears |
|
Insulation Class |
Class A |
|
Protection Structure |
Fully sealed, waterproof, dustproof and leak-proof |
|
Operating Noise |
Ultra-low silent operation |
|
Design Service Life |
≥20 years under standard operation |
Product Advantages
Passive cooling with zero maintenance failure
Adopting pure natural convection cooling without moving parts such as fans and motors, it eliminates common failures of forced air cooling systems. The cooling system requires no maintenance throughout its service life, greatly improving overall equipment reliability.
01
Ultra-low noise for strict noise-sensitive areas
No forced cooling components bring negligible operating noise. It is perfectly suitable for residential areas, campuses, hospitals and commercial zones with strict noise control requirements.
02
Energy saving with zero auxiliary power consumption
No external power supply for cooling devices, achieving zero auxiliary energy loss. Combined with low-loss core and winding design, it effectively reduces long-term grid operation costs with higher economical efficiency than ONAF models.
03
Simplified structure for unattended operation
Streamlined structure with fewer failure points and strong environmental adaptability. It suits remote and unattended substations with limited maintenance conditions, realizing stable automatic operation.
04
Flexible installation with wide compatibility
No need for complex cooling control systems or reserved ventilation space. It supports pole-mounted, floor-standing, indoor and outdoor installation, adapting to most medium and small stable-load power distribution scenarios.
05
Product Applications
Residential Terminal Power Distribution: Terminal voltage transformation for residential communities and rural areas, ensuring stable and silent power supply for daily residential electricity consumption.
Public Facility Power Supply: Power supporting for schools, hospitals, parks and municipal facilities, featuring low noise and maintenance-free performance for long-term public operation.
Light Industrial Factory Power Distribution: Power supply for light industry workshops, warehouses and logistics parks, adapting to stable load and energy-saving operation requirements.
Remote Unattended Sites: Power distribution for field base stations, remote photovoltaic substations and mountainous area power grids, adapting to difficult maintenance scenarios.
Commercial Supporting Power Supply: Power distribution for shopping malls, office buildings and urban commercial complexes, meeting strict environmental and stable power supply standards in urban areas.
Grid Upgrade & Renovation: Used for urban and rural old grid renovation and medium-small load capacity expansion, improving grid energy efficiency and operational stability.
FAQ
Q: What is the difference between ONAN and ONAF cooling?
A: ONAN adopts dual natural convection of oil and air with no moving parts, zero noise and zero maintenance, suitable for stable medium and small loads. ONAF uses natural oil circulation plus forced fan cooling with stronger heat dissipation for variable heavy loads, but it has auxiliary power consumption, higher noise and regular maintenance needs.
Q: Can ONAN Cooling Oil-Immersed Transformers operate at full load continuously?
A: It supports long-term full-load operation under stable working conditions with balanced heat dissipation and stable temperature rise. It is not recommended for long-term overload or frequent impact load scenarios, where ONAF forced cooling models are more applicable.
Q: What are the main application scenarios for ONAN Cooling Oil-Immersed Transformers?
A: It is mainly applied in scenarios with stable load, strict noise requirements and limited maintenance conditions, including residential areas, public facilities, unattended remote stations and light industrial commercial power distribution, excluding heavy industrial fluctuating load scenarios.
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