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 three-phase 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.
Product Description
S20 Type Three-Phase Power Transformer: Energy-Efficient Power Distribution Solution
When your facility demands reliable power distribution with minimal energy waste, the S20 type three-phase power transformer delivers exceptional performance. Manufactured by Lijie Electric Power Technology Group—a leading enterprise with 2,000+ employees and annual sales exceeding 5 billion RMB—this transformer achieves National Standard Level 2 energy efficiency with operating efficiency exceeding 99% in the 30-70% load range. Our fully sealed design features non-excitation voltage regulation across 5 levels, supporting capacities from 30-3150kVA with a design life ≥30 years and maintenance-free operation for 24-hour uninterrupted power supply.
Why Choose Our Power Transformers?
You need equipment that works hard without constant supervision. Our transformers combine advanced engineering with practical benefits that impact your bottom line.
Superior Energy Performance
Your power costs matter. This transformer decreases no-load misfortune by 15-20% compared to S13 models and 8-12% versus S18 models. You'll see lower vitality utilization immediately.
The high-permeability cold-rolled grain-oriented silicon steel sheets with completely diagonal joints guarantee negligible vitality squander. With working proficiency over 99% in commonplace stack conditions, you're getting more control conveyed with less input.
Built for Longevity
You need hardware that endures. The completely fixed folded oil tank plan dispenses with the require for an oil conservator. No center lifting required implies really maintenance-free operation.
The ONAN oil-immersed self-cooling strategy keeps everything running easily. Temperature rises remain controlled—oil beat ≤55K, winding ≤65K—ensuring your transformer handles every day operations and starting stack changes without breaking a sweat.
Robust Construction
Your operations can't bear hardware disappointment. All-copper windings with high-voltage round and hollow and low-voltage foil/cylindrical arrangements give uniform oil channels and extraordinary short-circuit resistance.
The item withstands control network impacts and sudden stack changes much appreciated to amazing energetic and warm steadiness. You can indeed run short-term over-burdens whereas remaining inside secure temperature edges that ensure separator layers.
Technical Specifications
| Parameter | Specification |
|---|---|
| Voltage Level | 6kV, 12kV |
| Capacity Range | 30-3150kVA |
| Frequency | 50Hz, 60Hz |
| Number of Phases | Single-phase, Three-phase |
| Voltage Regulation | Non-excitation, 5 levels |
| Tap Range | ±5%, ±2×2.5% |
| Connection Group | Yyn0 or Dyn11 |
| Cooling Method | ONAN (Oil-immersed self-cooling) |
| Protection Level | IP00 (IP30+ for outdoor substations) |
| Insulation Level | Power frequency 35kV AC, Impulse 75kV |
| Energy Efficiency | National Standard Level 2 (Level 1 available) |
| Design Life | ≥30 years |
| Operating Temperature | Max 40℃ outdoor |
Ideal Applications
Your industry has unique power needs. We've designed this transformer for versatility across multiple scenarios:
- Urban and rural power grid upgrades requiring energy-efficient distribution
- Industrial plants with demanding load profiles
- Commercial buildings needing reliable 24/7 power
- New energy facilities supporting renewable integration
- Public infrastructure projects prioritizing longevity
The standardized design means you get proven reliability. Need something specific? Customization is available for special requirements.
Compliance and Quality Assurance
You deserve confidence in your equipment. All our transformers pass rigorous testing by the National Transformer Quality Supervision and Inspection Center and Wuhan High Voltage Research Institute.
We hold international certifications including ISO 9001:2015, CE, UL, and IEC standards. Energy efficiency certification from CQC and PCCC confirms our S20 type three-phase power transformer meets GB 20052-2024 standards for energy-efficient power distribution equipment.
Frequently Asked Questions
Q: What makes the S20 model more efficient than previous generations?
A: The S20 uses advanced grain-oriented silicon steel with optimized core construction. This reduces no-load losses significantly while maintaining excellent load performance. You'll notice lower operating costs almost immediately.
Q: Does this transformer really require no maintenance?
A: Yes. The fully sealed corrugated tank design eliminates oil conservator maintenance and prevents moisture ingress. No core lifting is ever needed. Regular external inspections are recommended, but internal maintenance is not required during normal operation.
Q: Can it handle voltage fluctuations in my area?
A: Absolutely. The 5-level non-excitation voltage regulation (±5%, ±2×2.5%) accommodates common grid variations. The robust construction handles sudden load changes and grid impacts without compromising performance.
Q: What's the typical delivery timeline?
A: Production cycles range from 6-30 days depending on capacity and customization requirements. We'll provide a specific timeline based on your order specifications.
Q: Is technical support available after installation?
A: Yes. We provide comprehensive support including installation guidance, technical documentation, test reports, and spare parts supply. Our engineering team remains available throughout your transformer's operational life.
Global Trust, Local Service
Customers across Australia, New Zealand, India, Vietnam, Malaysia, Indonesia, Kazakhstan, Egypt, and Kenya rely on our transformers. You're choosing a manufacturer with proven global reach and deep technical expertise.
Our two manufacturing bases in Xuzhou and Nantong span 500,000 square meters, equipped with advanced production facilities. Over 160 engineers and technical professionals with doctoral and master's degrees drive continuous innovation.
Ready to Upgrade Your Power Distribution?
We'll help you select the perfect configuration for S20 type three-phase power transformer and provide detailed specifications for your project. Reach us at lijieelectrical@gmail.com to get started.
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