This 500 kVA oil-immersed distribution transformer adopts a new low-loss silicon steel sheet core with high magnetic permeability and ultra-low no-load loss. Its high-purity copper or aluminum windings feature reliable insulation and excellent conductivity, effectively reducing load loss and improving power conversion efficiency. Designed with a fully sealed tank and high-quality insulating oil, it realizes uniform natural heat dissipation via large-area heat sinks, adapting to high-temperature, humid and dusty outdoor environments. Equipped with a standard tap changer, it supports ±2×2.5% and ±5% voltage regulation to cope with grid voltage fluctuations. Manufactured in compliance with IEC 60076 standards, the transformer delivers stable insulation, strong short-circuit resistance, good corrosion and seismic performance, achieving long-term maintenance-free operation for 50/60Hz power distribution systems.
Product Advantages
Low Loss & High Energy Saving
Adopting new low-loss iron core and precision winding technology, it greatly reduces no-load and load loss with high power conversion efficiency, effectively lowering power consumption and operating costs during long-term operation. It delivers remarkable energy-saving effects compared with traditional models, perfectly adapting to long-term continuous power supply for industrial and commercial scenarios.
01
ONAN Self-cooling & Stable Heat Dissipation
Adopting mature ONAN self-cooling system, it continuously dissipates heat through natural convection circulation of insulating oil. The widened heat sink design provides larger heat dissipation area and uniform temperature rise. Without forced air cooling devices, it features low failure rate and low operating noise, maintaining stable temperature under full load and short-time overload operation without overheating faults.
02
Fully Sealed & Maintenance-free
The fully welded and sealed structure effectively isolates air, moisture and dust, preventing insulating oil from oxidation, moisture and aging. It requires no frequent oil refilling or replacement, greatly reducing later maintenance costs. The anti-corrosion, anti-rust and anti-aging body ensures long service life, suitable for harsh outdoor and field working conditions.
03
Flexible Voltage Regulation & Wide Adaptability
Equipped with multi-grade tap changer, it flexibly adjusts the transformation ratio according to on-site grid voltage fluctuation, stably maintaining accurate low-voltage output and avoiding equipment damage and power abnormality caused by unstable voltage. It adapts to various power supply scenarios such as municipal power grids, photovoltaic grid connection and factory dedicated lines.
04
Strong Short-circuit & Impact Resistance
The reinforced winding insulation structure features high mechanical strength and excellent short-circuit resistance, resisting instantaneous current impact and short-circuit faults without deformation, breakdown or burnout. With reasonable temperature rise gradient and strong overload tolerance, the transformer operates stably without jitter or abnormal noise, ensuring high continuity and safety of power supply.
05
Production Details
Core Technology
Made of high-permeability and low-loss cold-rolled silicon steel sheets, adopting multi-stage lamination and 45° full oblique seam technology. The compact and uniform lamination structure reduces no-load loss and operating noise, balances magnetic circuit distribution and avoids local overheating.
Winding Technology
Adopts high-purity oxygen-free copper/aluminum conductors with low resistivity and excellent conductivity. Layered and standardized winding with multi-layer insulation isolation ensures tight and neat arrangement. It improves short-circuit resistance and impact resistance effectively and reduces load loss.
Insulation Technology
Adopts high-temperature and high-strength composite insulation materials with vacuum impregnation and drying curing process. The fully penetrated and firmly bonded insulation layer provides strong isolation against moisture, dust and voltage impact, preventing insulation breakdown and electric leakage.
Tank & Sealing Technology
The tank is made of high-quality steel plates through CNC bending and automatic welding, with full and dense welds without pores and virtual welding. The fully sealed structure with aging-resistant seals isolates external moisture and impurities, preventing insulating oil oxidation and deterioration to realize long-term maintenance-free operation.
Heat Dissipation Technology
Widened and thickened corrugated heat sinks are integrally stamped with large heat dissipation area and high structural strength. Combined with natural oil circulation heat dissipation, it dissipates heat evenly and efficiently, stabilizes temperature rise and adapts to long-term full-load continuous operation.
Voltage Regulation & Assembly Technology
Equipped with high-precision off-circuit tap changer with clear gears, accurate regulation and reliable contact. Adopting standardized modular assembly, the transformer features accurate terminal alignment and neat wiring. All products pass strict factory tests including voltage resistance, transformation ratio, no-load and short-circuit tests to ensure stable and reliable performance.
FAQ
Q: What scenarios are suitable for 500kVA oil-immersed transformers?
A: As a mainstream small and medium power distribution specification, it is suitable for most industrial and commercial power consumption scenarios, including factory workshops, commercial complexes, residential buildings, municipal power expansion, photovoltaic grid connection, mining sites and industrial parks. It supports outdoor open-air installation and long-term full-load stable operation, adapting to civil and industrial conventional power distribution systems.
Q: How to choose between oil-immersed and dry-type transformers?
A: Oil-immersed transformers are preferred for outdoor sites, continuous operation scenarios and projects with controllable budget and non-extreme fire protection requirements, featuring high cost performance, good heat dissipation, strong overload capacity and simple maintenance. Dry-type transformers are suitable for indoor enclosed spaces, high-rise buildings and scenarios with strict fire protection standards. For 500kVA working conditions, oil-immersed type has lower comprehensive operating cost and higher stability.
Q: Can the 500kVA oil-immersed transformers operate under short-time overload?
A: Yes. With sufficient redundant design of iron core, windings and heat dissipation system, the transformer allows short-term moderate overload operation to cope with peak power consumption and instantaneous load impact without overheating or burnout failures. Long-term continuous overload operation is not recommended to avoid accelerated insulation aging and shortened service life.
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