The HENTG POWER 300kVA 10kV/0.4kV Three-Phase Oil-Immersed Transformer (ONAN) is engineered for stable and efficient power distribution in commercial, industrial, and utility networks.

Built with optimized magnetic core design and high-grade copper windings, it delivers low losses, enhanced overload capability, and long service life under demanding operating environments. This model provides reliable performance for regions with sand, dust, high humidity, and unstable voltage conditions.

• High-Efficiency Core

  Low-loss silicon-steel core reduces energy consumption and improves long-term operating efficiency.

• Enhanced Mechanical Strength

  High-quality copper winding and reinforced insulation provide strong short-circuit resistance and thermal stability.

• Reliable Oil Tank Structure

  Anti-corrosion tank with sealed structure minimizes oil leakage risk and ensures long service life in harsh climates.

• Designed for Dust-Intensive Regions

  Special sealing, anti-contamination components, and durable gaskets improve reliability in sandy and desert environments.

• Easy Installation & Maintenance

  Compact design, stable ONAN cooling, and user-friendly terminal layout reduce installation and maintenance difficulty.

• Off-circuit tap changer
• On-load tap changer (OLTC)
• Smart monitoring module
• Customized bushings / terminals

1: Dust and sand entering the tank increases the risk of insulation aging and oil contamination.

Enhanced multi-layer sealing structure, high-performance gaskets, and stainless-steel bolts ensure a tight and stable enclosure to prevent dust intrusion.

2: High temperatures and harsh climate conditions accelerate oil deterioration.

High-purity mineral oil with strong oxidation resistance and an ONAN cooling system maintain stable thermal performance.

3: Frequent oil leakage in harsh outdoor conditions increases maintenance costs.

Reinforced welded tank
Anti-corrosion epoxy coating
Improved flange sealing rings
These measures significantly reduce leakage risk and extend service life.

4: Voltage instability in rural or remote areas affects equipment lifespan.

Optimized electromagnetic design offers strong overload capability to maintain stable output under fluctuating grid conditions.

• Public utility power distribution
• Commercial buildings
• Rural electrification
• Industrial plants and workshops
• Agricultural irrigation stations
• Mining and construction sites
• Water treatment facilities
• Small renewable energy systems

Can the transformer operate reliably in high-dust and sandy environments?

Yes. The product uses enhanced sealing, anti-corrosion coating, and stable tank design to maintain long-term performance in harsh outdoor conditions.

What is the typical delivery time for 300kVA oil-immersed transformers?

Standard models are usually available within 2–4 weeks, while customized configurations may require additional lead time.

Can the transformer be customized for different voltage levels or tap ranges?

Yes. Input/output voltage, tap changer range, vector group, bushings, and accessories can all be tailored for project requirements.

What tests are performed before shipment?

Routine tests include no-load loss, load loss, insulation test, ratio test, impedance test, and temperature rise inspection according to IEC standards.