20kV Oil-Immersed Transformer - China Manufacturers

1. Low loss, fully sealed, non-excitation voltage regulation (5 levels), 24-hour uninterrupted power supply, long annual operating time (design life ≥ 30 years). 2. Cooling method: ONAN oil-immersed self-cooling. 3. High-permeability cold-rolled grain-oriented silicon steel sheets (0.23mm grade), fully oblique joints, no punching, low noise, low loss. 4. Fully sealed corrugated oil tank, no oil conservator; fully sealed structure, no core lifting, no maintenance. 5. High-permeability grain-oriented silicon steel sheets, multi-level joints, low noise; Protection level: IP00 (outdoor transformer substations can reach IP30 or higher). 6. Windings: All copper, high-voltage cylindrical type, low-voltage foil/cylindrical type, uniform oil channels, strong short-circuit resistance. 7. Applicable scenarios: Suitable for urban and rural power grids, industrial plants, commercial buildings, new energy supporting facilities, and other diverse scenarios. 8, Standard application scenarios: urban residential communities, commercial complexes, office buildings; industrial parks, factories, enterprise power distribution, municipal public facilities; rural power grids, urban public transformer area renovation, etc.

S18 20kV Three-Phase Fully Sealed Oil-Immersed Distribution Transformer

The S18 20kV Three-Phase Fully Sealed Oil-Immersed Distribution Transformer from Lijie Electric delivers exceptional performance. Manufactured at our 500,000-square-meter facilities with over 2,000 skilled professionals, this transformer features a fully sealed corrugated oil tank design that eliminates oil conservators and external contamination. With a design life exceeding 30 years, capacity ranging from 30-3150kVA, and maintenance-free operation, you get enterprise-grade reliability. The unit operates with ONAN cooling, uses 0.23mm high-permeability grain-oriented silicon steel, and provides continuous 24-hour power supply with significantly reduced energy losses compared to conventional models.

S18 20kV Three-Phase Fully Sealed Oil-Immersed Distribution Transformer

Why Choose This Distribution Transformer?

Ultimate Energy Efficiency

Your operational costs matter. This transformer accomplishes first-class vitality productivity appraisals through premium press center materials and optimized winding plan. The high-permeability cold-rolled grain-oriented silicon steel sheets minimize both no-load and stack misfortunes. Over a long time of persistent operation, you'll take note considerable diminishments in power expenses—particularly profitable for high-load mechanical offices and persistently working control network nodes.

True Maintenance-Free Operation

Unlike conventional plans, this item employs an inventive layered oil tank structure. The completely fixed development anticipates dampness, clean, and pollutions from sulllying your protection oil. You won't require normal center lifting, oil renewal, or oil changes. This plan drastically cuts upkeep costs and diminishes downtime—perfect for farther establishments and unattended substations.

Built for Harsh Environments

Durability is designed into each component. The coordinates press center clamping handle, strengthened windings, and upgraded cover give great short-circuit withstand capability. Anti-corrosion coating on the oil tank guarantees rust resistance indeed in muggy coastal zones, mechanical zones, or open air establishments. You can believe this transformer to keep up steady control supply through voltage changes and sudden stack changes.

Quiet and Environmentally Conscious

Operating commotion remains surprisingly moo much obliged to optimize center cover and oil stream channels. Your office and encompassing regions stay free from commotion contamination. The energy-efficient plan adjusts with green control dispersion standards, making a difference you meet maintainability objectives whereas diminishing carbon impression.

Technical Specifications

Parameter	Specification
Voltage Rating	20kV
Capacity Range	30-3150kVA
Phases	Single-phase, Three-phase
Frequency	50Hz, 60Hz
Voltage Regulation	Non-excitation, ±5%, ±2×2.5% (5 levels)
Connection Group	Yyno or Dyn11
Cooling Method	ONAN (Oil-immersed self-cooling)
Insulation Level	Power frequency: AC-35kV; Impulse: L1-75kV
Protection Level	IP00 (IP30+ available for outdoor substations)
Design Life	≥30 years
Core Material	0.23mm high-permeability grain-oriented silicon steel
Winding Material	All copper (high-voltage cylindrical, low-voltage foil/cylindrical)
Tank Design	Fully sealed corrugated structure, no oil conservator
Operating Temperature	Maximum 40℃ outdoor (customizable)

S18 20kV Three-Phase Fully Sealed Oil-Immersed Distribution Transformer

Ideal Applications

This versatile transformer serves diverse power distribution needs:

Urban Infrastructure: Residential communities, commercial complexes, office buildings
Industrial Facilities: Manufacturing plants, industrial parks, enterprise distribution systems
Rural Electrification: Power grid upgrades, transformer area renovations
New Energy Projects: Wind power and photovoltaic system integration
Municipal Projects: Public facilities, transportation systems
Commercial Centers: Shopping malls, hotels, data centers

The S18 20kV Three-Phase Fully Sealed Oil-Immersed Distribution Transformer adapts to your specific requirements with customizable configurations and flexible production cycles of 6-30 days.

S18 20kV Three-Phase Fully Sealed Oil-Immersed Distribution Transformer

Frequently Asked Questions

Q: What makes this transformer maintenance-free?

A: The fully sealed corrugated oil tank completely isolates transformer oil from external air and moisture. This prevents oil degradation, eliminates the need for oil changes, and removes requirements for core lifting or regular maintenance.

Q: How much energy can I save with this model?

A: Using first-class energy efficiency standards and 0.23mm grain-oriented silicon steel, this unit significantly reduces no-load and load losses compared to conventional transformers. Actual savings depend on your load profile, but continuous operation facilities often recover investment costs quickly through reduced electricity bills.

Q: Is it suitable for outdoor installation?

A: Absolutely. The anti-corrosion treated oil tank withstands harsh weather, humidity, and industrial environments. Protection levels reach IP30 or higher for outdoor substations, ensuring reliable operation in open-air conditions.

Q: What voltage regulation options are available?

A: The transformer features non-excitation voltage regulation with 5 levels (±5%, ±2×2.5%). Adjustments are made safely when the unit is de-energized, providing convenient and reliable voltage control.

Q: Can you customize specifications for special projects?

A: Yes. Our engineering team can tailor capacity, voltage levels, connection groups, and environmental specifications to match your project requirements. Production timelines typically range from 6 to 30 days depending on customization complexity.

Q: What certifications does this product hold?

A: Our transformers meet international standards with ISO 9001:2015, CE, UL, and IEC certifications. All units pass testing by the National Transformer Quality Supervision and Inspection Center and comply with GB/T 27922-2021 standards.

Contact Us

Reach out to our team at lijieelectrical@gmail.com for technical specifications, quotations, or project consultation for S18 20kV Three-Phase Fully Sealed Oil-Immersed Distribution Transformer.