20kV S13 Sealed Transformer - China Manufacturers

1. Low loss, fully sealed, non-excitation voltage regulation (5 levels), 24-hour uninterrupted power supply, long annual operating time. 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, corrugated plate automatically compensates for oil volume changes; completely isolated from the atmosphere, maintenance-free, prevents oil aging, and extends lifespan. 5. Windings: high-purity oxygen-free copper wire; cylindrical/continuous type, uniform oil channels, strong short-circuit resistance. 6. 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. 7. Standardized design, special requirements can be customized.

S13 Type 20kV Three-Phase Fully Sealed Distribution Transformer

The S13 type 20kV three-phase fully sealed distribution transformer from Suqian Lijie Electric Technology Co., Ltd. delivers exceptional performance with proven energy efficiency. This advanced transformer features a capacity range of 30-3150kVA, five-level non-excitation voltage regulation (±5%, ±2×2.5%), and fully sealed corrugated oil tank design that eliminates maintenance needs. With high-permeability silicon steel core (0.23mm grade) and all-copper windings, you get ultra-low loss operation and 24-hour uninterrupted power supply backed by our annual sales exceeding 5 billion RMB and a team of over 160 engineers.

S13 type 20kV three-phase fully sealed distribution transformer

Why Choose Our 20kV Distribution Transformer?

You require hardware that works difficult without consistent consideration. Our completely fixed transformers are built differently.

Maintenance-Free Operation

The folded oil tank consequently compensates for oil volume changes. No oil conservator implies total segregation from climate. Your transformer oil remains new longer. The fixed plan avoids maturing and expands benefit life significantly.

Superior Vitality Efficiency

We utilize 0.27mm high-permeability cold-rolled grain-oriented silicon steel sheets. The completely angled joint development kills punching. This implies lower clamor and diminished misfortunes for your operation.

Your power costs matter. This plan makes a difference you spare on vitality bills year after year.

Robust Construction

All windings utilize high-purity oxygen-free copper wire. The round and hollow persistent plan makes uniform oil channels. You get prevalent short-circuit resistance when control surges occur.

The Dyn11 association gather and oil-immersed self-cooling (ONAN) strategy guarantee steady execution indeed amid top request periods.

Technical Specifications

Parameter	Specification
Voltage Rating	20kV (±2×2.5%) / 0.4kV
Capacity Range	30-3150kVA
Frequency	50Hz / 60Hz
Phases	Three-phase
Connection Group	Dyn11 or Yyn0
Voltage Regulation	Non-excitation, 5 levels
Cooling Method	ONAN (Oil-immersed self-cooling)
Power Frequency Withstand	AC 35kV
Impulse Withstand	L1 75kV
Operating Temperature	Maximum 40℃ outdoor
Core Material	High-permeability silicon steel (0.23mm)
Winding Material	High-purity oxygen-free copper
Tank Design	Fully sealed corrugated structure
Standards Compliance	GB 1094, GB/T 6451, GB 20052

S13 type 20kV three-phase fully sealed distribution transformer

Ideal Applications

This S13 type 20kV three-phase fully sealed distribution transformer serves diverse power distribution needs:

Urban Infrastructure

Residential communities and apartment complexes
Commercial shopping centers
Office buildings and business districts
Municipal public facilities

Industrial Settings

Manufacturing plants and factories
Industrial parks and enterprise zones
Production facilities requiring stable power

Rural Electrification

Rural power grid expansion
Urban-rural transformer station upgrades
Agricultural distribution networks

Certified Quality You Can Trust

Our transformers pass rigorous testing by the National Transformer Quality Supervision and Inspection Center and Wuhan High Voltage Research Institute. We hold ISO 9001:2015, CE, UL, and IEC certifications.

Every unit receives CQC and PCCC energy efficiency certification. Your investment meets international standards and Chinese national regulations.

Manufacturing Excellence

Lijie Electric operates two advanced manufacturing bases in Xuzhou and Nantong spanning 500,000 square meters. Our team includes over 2,000 skilled workers and 160+ engineers with doctoral and master's degrees.

We produce transformers from 10kV to 500kV and above. Our annual production capacity ensures reliable supply with delivery cycles of 6-30 days depending on customization requirements.

S13 type 20kV three-phase fully sealed distribution transformer

Frequently Asked Questions

Q: What makes the fully sealed design better than traditional transformers?

A: The corrugated tank eliminates the oil conservator completely. This prevents moisture and air contamination. Your transformer requires zero routine maintenance. Oil life extends dramatically compared to breather-equipped models.

Q: Can you customize specifications for special projects?

A: Absolutely. While we offer standardized designs, our engineering team tailors transformers to your exact requirements. Different impedance values, special environmental conditions, or unique capacity needs are all manageable.

Q: How long does this transformer typically last?

A: With proper installation and the sealed design preventing oil degradation, you can expect 25-30 years of reliable service. Some units in favorable conditions operate even longer.

Q: What documentation do you provide?

A: Every transformer ships with complete technical drawings, operation manuals, factory test reports, and model registration certificates. We also supply installation guidance and spare parts information.

Q: Do you provide international shipping?

A: Yes. We export to Australia, New Zealand, India, Vietnam, Malaysia, Indonesia, Kazakhstan, Egypt, Kenya, and many other countries. Our team handles logistics and export documentation.

Q: What warranty coverage is included?

A: Standard warranty covers manufacturing defects and material issues. Our after-sales team provides technical support throughout the transformer's operational life. Contact us for specific warranty terms.

Contact Us

Reach out to our team at lijieelectrical@gmail.com for technical consultation, quotations, or customization inquiries for S13 type 20kV three-phase fully sealed distribution transformer today.