April 27, 2025
With a tight project schedule, the manufacturer delivered on time, and on-site technical personnel provided guidance throughout the entire installation and commissioning process; the collaboration was highly efficient and hassle-free.
S20 type 20KV power transformer
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 with fully oblique joints, no punching, low noise, and low loss.
4. Fully sealed corrugated oil tank, no oil conservator; fully sealed structure, no core lifting required, maintenance-free.
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. Excellent dynamic and thermal stability, able to withstand power grid impacts and sudden load changes; supports short-term overload operation, strictly controls temperature rise threshold, does not damage insulation layer, and ensures equipment lifespan.
9. Standardized design; customization available for special requirements.
10.
Product Description
S20 Type 20KV Power Transformer - Fully Sealed & Maintenance-Free Solution
The S20 type 20KV power transformer from Lijie Electric delivers enterprise-grade performance with proven results. Our fully sealed design offers 30+ years design life, achieving up to 40% loss reduction compared to conventional models. With production capacity across 500,000 square meters of manufacturing facilities and over 160 engineers backing every unit, we deliver transformers rated 30-3150kVA with 6-30 day production cycles. Certified to ISO 9001:2015, CE, UL, and IEC standards, our transformers serve power grids across 15+ countries with zero maintenance requirements.
What Makes Our S20 Power Transformer Different?
Advanced Fully Sealed Design
You won't require to stress around support. Our layered oil tank innovation disposes of the oil conservator completely. This completely fixed structure implies no center lifting, no oil changes, and altogether lower working costs over the transformer's lifetime.
The ONAN oil-immersed self-cooling framework works discreetly and productively. You get reliable execution without the bother of conventional support schedules.
Superior Energy Efficiency
We utilize high-permeability cold-rolled grain-oriented silicon steel sheets. The completely diagonal joint development implies lower misfortunes and calmer operation for your facility.
Your vitality bills will reflect the distinction. The item consolidates new-generation low-loss innovation that diminishes squander and maximizes efficiency.
Built to Last
Your venture is ensured by vigorous building. The copper windings include round and hollow high-voltage plan and foil/cylindrical low-voltage arrangement. Uniform oil channels give uncommon short-circuit resistance.
Dynamic and warm solidness guarantee your transformer handles framework impacts and sudden stack changes without compromising the separator layer. Temperature rise edges are entirely controlled to protect hardware life expectancy.
Technical Specifications
| Parameter | Specification |
|---|---|
| Voltage Level | 6kV, 12kV, 20kV |
| Rated Capacity | 30-3150kVA |
| Voltage Regulation | Non-excitation, 5-tap |
| Tap Range | ±5%, ±2×2.5% |
| Frequency | 50Hz / 60Hz |
| Phases | Single-phase / Three-phase |
| Connection Group | Yyn0 or Dyn11 |
| Cooling Method | ONAN (Oil Natural Air Natural) |
| Protection Level | IP00 standard (IP30+ available) |
| Insulation Level | Power frequency: AC-35kV Impulse: L1-75kV |
| Design Life | ≥30 years |
| Max Ambient Temp | 40℃ (customizable) |
Where Can You Use It?
Your application possibilities are extensive:
- Urban & Rural Power Grids: Reliable distribution for residential areas
- Industrial Plants: Handle heavy machinery and variable loads
- Commercial Buildings: Quiet operation for office complexes and shopping centers
- New Energy Projects: Solar and wind farm integration
- Mining Operations: Rugged performance in demanding environments
The standardized design adapts to diverse scenarios. Need something special? We offer customization for high altitude, corrosive environments, and extreme temperatures.
Why Choose Lijie Electric?
With annual sales exceeding 5 billion RMB, we're not a small operation. Our two manufacturing bases in Xuzhou and Nantong employ over 2,000 professionals dedicated to transformer excellence.
Every S20 type 20KV power transformer passes rigorous testing at the National Transformer Quality Supervision and Inspection Center. You receive complete documentation: technical drawings, operation manuals, and test reports.
Our global footprint spans Australia, New Zealand, India, Vietnam, Malaysia, Indonesia, Kazakhstan, Egypt, and Kenya. We understand international requirements and deliver accordingly.
Complete Support Package
You're not just buying equipment. Our team provides:
- Installation guidance and commissioning support
- Spare parts availability
- Comprehensive technical documentation
- Responsive after-sales service meeting GB/T 27922-2021 standards
Frequently Asked Questions
Q: What's the difference between the S20 and older transformer models?
A: The S20 type uses advanced low-loss silicon steel and fully sealed construction. You get lower operating costs, zero maintenance, and longer service life compared to S11 or S13 models.
Q: How long does delivery take?
A: Standard configurations ship within 6-30 days depending on capacity and specifications. Custom orders may require additional time for engineering review.
Q: Can you customize for special conditions?
A: Absolutely. We handle high-altitude installations, corrosive environments, low-temperature operations, and non-standard voltage requirements. Just share your specifications.
Q: What testing do transformers undergo before shipment?
A: Every unit completes withstand voltage testing, sealing verification, loss measurement, and dynamic/thermal stability testing. You receive certified test reports with your order.
Q: Is training provided for operation and maintenance?
A: Yes. We provide technical documentation and can arrange on-site guidance for installation and commissioning. The sealed design requires minimal routine maintenance.
Q: What warranty coverage do you offer?
A: We provide comprehensive warranty coverage backed by our quality assurance program. Specific terms depend on your application and operating conditions.
Get Your Custom Quote Today
Ready to upgrade your power distribution? Contact our engineering team at lijieelectrical@gmail.com to discuss your specific requirements for S20 type 20KV power transformer and receive a detailed quotation.
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