Energy-saving 800kVA Oil-filled Step-Up 0.69kV to 11kV Distribution Transformer

This 800kVA oil-immersed step-up transformer is HENTG Power’s flagship solution tailored for Renewable Energy Integration. It steps up the inverter output of 0.69kV to 11kV for efficient long-distance power distribution, minimizing line losses.

Optimized for the fluctuating load patterns of solar and wind systems, its electromagnetic design ensures maximum conversion efficiency even under non-linear loads.

• Premium Energy Efficiency: Utilizes high-quality silicon steel, reducing no-load losses by 15% more than IEC standards for higher ROI.

• Renewable-Ready Design: Enhanced overload capacity and harmonic resistance specifically for solar/wind fluctuations.

• Coastal-Grade Protection: Long-lasting C5-class coating provides extreme resistance to oxidation in salt-mist environments.

• Hermetically Sealed Reliability: Corrugated tank design with vacuum oil-filling prevents moisture ingress and oil aging.

• Flexible Tap Changer: Multiple tapping positions to compensate for grid voltage fluctuations and ensure stable output.

• 20-Year Design Life: Built with Class A insulation materials to withstand decades of harsh outdoor exposure.

• High-Performance Core: Cold-rolled grain-oriented (CRGO) silicon steel with 45° full-miter joints to minimize noise and excitation current.

• Oxygen-Free Copper Windings: High-purity electrolytic copper with advanced axial and radial bracing to withstand short-circuit stresses.

• Efficient Cooling (ONAN): Natural oil circulation through corrugated panels eliminates the need for maintenance-heavy fans.

• Vacuum Impregnation: All units are processed under high vacuum to eliminate air bubbles and maximize dielectric strength.

• Off-Circuit Tap Changer: HV side tapping range of ±2×2.5% to adapt to varying grid interconnection requirements.

Market Problem: In coastal regions (e.g., SE Asia, Middle East, LatAm), high salinity and humidity lead to rapid rusting, bushing flashovers, and premature transformer failure.

HENTG’s Solution:

• Marine-Grade Surface Treatment: A triple-coat system (Zinc-rich primer + Epoxy mica iron intermediate + Polyurethane topcoat) reaching ISO 12944 C5-M standards.

• Stainless Steel Fasteners: All external bolts, nuts, and washers are Grade 304/316 Stainless Steel to prevent structural rust.

• High Creepage Distance Bushings: Specialized porcelain bushings with extended creepage paths prevent surface tracking caused by salt deposits.

• Robust Sealing Technology: High-grade oil-resistant and weather-proof gaskets ensure no moisture ingress under tropical conditions.

Q1: Does this transformer comply with international standards?

A: Yes, our products are manufactured according to IEC 60076 and can be certified upon request.

Q2: Can you customize for specific voltages like 0.69kV to 22kV?

A: Absolutely. Custom voltage ratios, dual-split windings, and specific impedance values are our specialties.

Q3: How do you guarantee coating quality for coastal solar farms?

A: We use automated sandblasting and coating lines. Every "coastal-version" unit undergoes thickness and adhesion testing to verify C5 compliance.

Q4: What is the typical lead time for EPC projects?

A: For standard 800kVA units, the production cycle is 25-35 days. We prioritize EPC project schedules to ensure timely grid connection.

Q5: Is maintenance required during operation?

A: Our hermetically sealed design is virtually maintenance-free. Only periodic oil level checks and infrared temperature scans are recommended.

HENTG POWER is a premier manufacturer of customized industrial and power transformers. We specialize in providing complete solutions for solar PV, wind farms, industrial distribution, and extreme environment applications.

With automated production lines and a comprehensive testing lab, HENTG POWER serves projects across dozens of countries, ensuring reliable and efficient green energy integration from the coldest mountains to the saltiest coasts.

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