Moisture-proof 630kVA 0.4kV 11kV self-cooled Oil-Immersed Distribution Power

This 630kVA 11kV/0.4kV oil-immersed distribution transformer is a customized solution engineered by HENTG Power specifically for Solar PV power plants and industrial applications. Featuring a hermetically sealed design, it provides exceptional moisture protection. Equipped with an integrated tap changer, it ensures stable voltage output despite grid fluctuations. For coastal regions with high salt spray, we provide enhanced anti-corrosion treatments, ensuring a service life of over 20 years in harsh environments.

• Solar PV Optimized: Specially reinforced to handle harmonic loads and the intermittent nature of solar power generation.

• Superior Moisture-Proof Sealing: Vacuum-filled and hermetically sealed corrugated tank prevents air and moisture ingress, extending oil life.

• Industrial-Grade Corrosion Resistance: Designed for C4/C5 corrosion levels with specialized protective coatings to resist salt spray.

• Energy-Efficient Design: High-quality grain-oriented silicon steel reduces no-load losses by 15-20% compared to standard IEC requirements.

• Flexible Voltage Regulation: Off-circuit tap changer (±2x2.5%) allows for easy adjustments to suit site-specific load variations.

• High Reliability: Rigorously tested for temperature rise and short-circuit withstand, ensuring stable operation at 50°C ambient temperatures.

• Core: High-permeability, cold-rolled grain-oriented (CRGO) silicon steel with a 45° full-miter joint to minimize noise and losses.

• Winding: High-purity oxygen-free copper conductors with layered or continuous structures for superior mechanical strength and short-circuit resistance.

• Insulation System: Class A insulation materials paired with high-performance transformer oil for excellent dielectric strength and cooling.

• Tank Design: Corrugated tank walls provide an aesthetic look and large cooling surface area. Automated welding ensures 100% leak-proof performance.

• Pressure Relief Device: High-sensitivity pressure relief valve on the top acts instantly during internal pressure anomalies to protect the unit.

• Tap Changer: Located on the HV side, allowing manual voltage adjustment (typically ±5% or ±2x2.5%) via a secure mechanism.

Product Attributes

Market Main Points: Coastal areas suffer from high salt spray, humidity, and extreme corrosivity. Standard transformers often experience shell rusting, insulation degradation, and fastener failure within 2-3 years, leading to massive maintenance costs.

HENTG Solution:

• Surface Treatment: A triple-layer coating process (Primer, Intermediate, Topcoat) using zinc-rich anti-rust primer and UV-resistant fluorocarbon topcoat, meeting C4-M or C5-M marine-grade standards.

• Hardware Upgrade: All external fasteners (bolts, nuts) are upgraded to Grade 304 or 316 stainless steel to eliminate rust risk.

• Reinforced Sealing: High-quality, oil-resistant, and weather-resistant gaskets ensure the sealing system does not degrade under high salinity.

• Protective Accessories: Bushings are equipped with protective covers to prevent flashovers caused by salt deposit buildup.

Q1: How do you guarantee the lifespan of transformers in high-humidity coastal areas?

A: We use a hermetically sealed tank that completely isolates the oil from the atmosphere. Additionally, the enclosure undergoes a marine-grade coating process and passes a 1,000-hour salt spray test.

Q2: Does this 630kVA transformer comply with IEC or ANSI standards?

A: Yes, all HENTG transformers are manufactured in strict accordance with IEC 60076. We can also provide customized versions compliant with ANSI, IEEE, or AS/NZS standards upon request.

Q3: As an EPC company, we need fast delivery. What is your lead time?

A: For standard 630kVA specifications, our lead time is typically 3-4 weeks. For complex custom solutions, our efficient supply chain ensures delivery within 45 days.

Q4: Do you provide on-site installation guidance or after-sales support?

A: We provide detailed installation manuals and video tutorials. For large-scale EPC projects, we can arrange senior engineers for remote video support or on-site supervision.

Q5: What is the warranty period?

A: We offer a standard 24-month warranty, which can be extended to 5 years based on project requirements. We also provide technical consultation throughout the product's lifecycle.

HENTG Power is a leading global expert in customized transformer solutions. We specialize in diverse electrification applications—from solar PV plants and energy storage systems to industrial distribution.

With advanced manufacturing facilities and an experienced R&D team, we don't just build transformers; we provide precise technical support for extreme environments (coastal, high altitude, extreme temperatures), ensuring your projects stay powered under any conditions.

Get a Custom Quote for Your Coastal Project Today!