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.
S11 type 20kV fully sealed distribution transformer
1. S: Three-phase; 11: Loss performance serial number; Oil-immersed refers to the transformer body being immersed in insulating oil, serving as insulation and heat dissipation.
2. The product should comply with current national standards such as GB 1094, GB/T 6451, and GB/T 25289, and provide a complete type test report.
3. Structure and features: The core uses high-permeability silicon steel sheets, the winding is an all-copper structure, and it has a fully sealed corrugated oil tank, requiring no maintenance.
4. Scenarios: 20kV distribution network dense urban new areas, industrial parks, and county power grid upgrades; replacing traditional 10kV capacity expansion, reducing line loss and increasing power supply radius. (Altitude ≤ 1000m; Ambient temperature -25℃ to +40℃; No severe vibration, chemical corrosion, or explosion risk locations. If altitude/temperature exceeds the standard, derating according to standard is required.)
5. The S11 model is a mature and economical model, and its cost performance is outstanding for routine projects.
6. Standardized design, special requirements can be customized.
7. Selection and procurement tips:
(1) Clarify the capacity, voltage ratio, connection group, voltage regulation range, impedance, and cooling method.
(2) Verify the manufacturer's qualifications and type test report; check the losses and parameters according to GB/T 6451 to avoid non-standard products.
Product Description
S11 Type 20kV Fully Sealed Distribution Transformer – Reliable Power Solution for Modern Grids
When your power distribution system demands efficiency and reliability, the S11 type 20kV fully sealed distribution transformer from Lijie Electric delivers exactly that. Manufactured at our 500,000 square meter facilities with over 160 engineers, this energy-saving transformer features all-copper windings, high-permeability silicon steel cores, and a maintenance-free corrugated oil tank design. With capacity ranges from 30-2500kVA and impressive loss reduction performance, our transformers serve industrial parks, urban substations, and grid upgrades across 20+ countries. Annual sales exceeding 5 billion RMB reflect our commitment to quality and innovation.
What Makes Our 20kV Distribution Transformers Stand Out?
You get more than just equipment when you choose Lijie Electric. Our fully sealed design eliminates moisture intrusion and oil deterioration completely. The corrugated tank naturally breathes as temperature changes, maintaining optimal pressure without external conservators.
Core Technical Features
Your transformer operates efficiently thanks to premium materials. High-permeability silicon steel sheets minimize core losses. All-copper windings ensure excellent conductivity and thermal performance. The sealed construction requires zero maintenance throughout its service life.
Temperature fluctuations? No problem. Our transformers handle ambient conditions from -25℃ to +40℃. The oil-immersed self-cooling system manages heat dissipation naturally, keeping components within safe operating ranges.
Built for Demanding Environments
Industrial parks and dense urban areas present unique challenges. Our S11 type 20kV fully sealed distribution transformer meets them head-on with robust short-circuit resistance and overload capacity. You'll see reduced line losses and extended power supply radius compared to traditional 10kV systems.
The connection group options (Yyno or Dyn11) give you flexibility in system design. Non-excitation voltage regulation with ±2 x 2.5% tap range lets you fine-tune output for varying load conditions.
Technical Specifications at a Glance
| Parameter | Specification |
|---|---|
| Voltage Rating | 20kV |
| Capacity Range | 30-2500kVA |
| Frequency | 50Hz / 60Hz |
| Phases | Single-phase / Three-phase |
| Voltage Regulation | Non-excitation, ±2 x 2.5% |
| Connection Group | Yyno or Dyn11 |
| Cooling Method | Oil-immersed self-cooling |
| Insulation Level | Power frequency 35kV AC, Impulse 75kV L1 |
| Operating Temperature | -25℃ to +40℃ |
| Altitude | ≤1000m (derating required above) |
| Standards Compliance | GB 1094, GB/T 6451, GB/T 25289 |
Why Lijie Electric Is Your Trusted Partner?
Our fabricating fabulousness stems from decades of involvement and ceaseless development. Two major generation bases in Xuzhou and Nantong house cutting-edge hardware worked by 2,000+ gifted professionals.
Quality certifications matter to your commerce. We hold ISO 9001:2015, CE, UL, and IEC endorsements. Each transformer experiences thorough testing at the National Transformer Quality Supervision and Review Center and Wuhan Tall Voltage Inquire about Institute.
Customization That Fits Your Needs
Standard plans work for numerous applications, but your venture might require something uncommon. We customize capacity, voltage proportions, impedance, and association arrangements to your correct details. Generation cycles run from 6-30 days depending on complexity.
Our worldwide impression ranges Australia, Unused Zealand, India, Vietnam, Malaysia, Indonesia, Kazakhstan, Egypt, Kenya, and past. Wherever your venture is found, we provide solid hardware and comprehensive bolster.
Frequently Asked Questions
Q: What's the difference between S11 and older transformer models?
A: The S11 series offers significantly lower no-load and load losses compared to S9 and S7 models. You'll see reduced energy costs and improved efficiency, making it ideal for grid modernization projects.
Q: Does the fully sealed design really eliminate maintenance?
A: Yes. The corrugated tank design flexes with oil expansion and contraction, eliminating the need for conservators, silica gel breathers, or oil level monitoring. You save on maintenance costs and personnel time.
Q: Can this transformer handle altitude or extreme temperature conditions?
A: Standard rating applies up to 1000m altitude and -25℃ to +40℃. For higher altitudes or extreme temperatures, we apply derating per GB standards or customize thermal management solutions.
Q: How do I ensure I'm buying a genuine quality product?
A: Always verify the manufacturer's type test report from accredited labs. Check that losses and parameters match GB/T 6451 standards. Lijie provides complete documentation including drawings, test reports, and certificates with every shipment.
Q: What after-sales support do you provide?
A: We offer installation guidance, spare parts supply, technical documentation, and ongoing technical support. Our team remains available throughout your transformer's operational life.
Q: What's the typical lead time for custom specifications?
A: Standard configurations ship within 6-10 days. Custom designs typically require 15-30 days depending on specification complexity and current production schedule.
Applications Across Industries
Your power infrastructure needs vary by sector. Our product adapts to multiple scenarios:
- Urban Distribution Networks: Dense residential areas benefit from compact design and enhanced safety features
- Industrial Parks: Heavy loads and continuous operation require robust construction and excellent overload capacity
- Commercial Centers: High reliability and low noise levels suit customer-facing environments
- Rural Grid Upgrades: Cost-effective solution for replacing aging 10kV infrastructure with improved capacity
The 20kV rating expands your control supply span whereas lessening copper utilization in conveyance lines. You accomplish way better voltage direction over longer distances.
Quality You Can Measure
Performance measurements illustrate our commitment to fabulousness. Our transformers reliably accomplish vitality effectiveness evaluations certified by CQC and PCCC. Temperature rise tests confirm warm plan edges. Drive testing affirms separator astuteness beneath lightning and exchanging surge conditions.
We do not fair meet standards—we surpass them. Our quality-first reasoning earned acknowledgment as a "National High-Tech Venture" and "Specialized, Refined, and Unused 'Little Giant'" assignment from Chinese specialists.
Contact Us
Ready to upgrade your distribution system with S11 type 20kV fully sealed distribution transformer? Reach out to our team at lijieelectrical@gmail.com for technical consultation, quotations, and customization options today.
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