Product Description
The S11-M series (20 kV) three-phase oil-immersed distribution transformers manufactured by Yueqing JASCO Electric comply with IEC 60076 and GB/T 1094 standards. They are widely used in the upgrading and renovation of urban and rural 20 kV power grids, as well as in industrial parks, mining areas, commercial districts, and international medium-voltage infrastructure projects. These are highly reliable medium-voltage units specifically designed for 20 kV distribution networks.
The transformer core utilizes high-quality cold-rolled grain-oriented silicon steel sheets processed by GEORG cutting equipment. A multi-stage circular cross-section structure and step-lap stacking process effectively reduce no-load losses, exciting current, and operating noise, ensuring long-lasting energy efficiency.
The high-voltage windings of the S11-M series feature a robust cylindrical structure, while the low-voltage windings can be configured as either cylindrical or foil types. Optimized magnetic circuit design and enhanced winding mechanical structures significantly improve the product's short-circuit withstand capability and resistance to mechanical shock.
These transformers do not require an oil conservator and are manufactured on a professional production line involving degreasing, phosphating, and anti-corrosion coating processes. They utilize a corrugated tank design; the corrugated panels accommodate the thermal expansion and contraction of the insulating oil while isolating the oil from the surrounding air, thereby delaying oil aging and eliminating the need for frequent maintenance.
The S11-M series employs a Class A insulation system and is equipped with an off-circuit tap changer (offering adjustment steps of ±5% or ±2×2.5%) to ensure a stable 0.4 kV low-voltage output, even amidst grid voltage fluctuations. The series supports various connection groups (such as Dyn11 and Yyn0); notably, the Dyn11 configuration eliminates zero-sequence harmonics, making it ideal for handling unbalanced single-phase loads. The S11-M series utilizes the ONAN (oil-immersed, self-cooled) cooling method, covers a capacity range of 30 kVA to 2500 kVA, and complies with IEC 60076 and GB/T 1094 standards.
Product Specification
|
Performance Category |
Characteristic Description |
|
Energy‑saving Performance |
High‑grade oriented silicon‑steel miter‑joint core; stable low no‑load loss for 20kV medium‑voltage distribution scenarios. |
|
Short‑circuit Resistance |
Reinforced cylindrical / foil winding; balanced ampere‑turn layout, strong resistance to short‑circuit electromagnetic impact. |
|
Sealing & Maintenance |
Conservator‑free fully‑sealed corrugated tank; oil isolated from air, slow aging, low‑maintenance outdoor running. |
|
Voltage Regulation |
Off‑circuit tap ±5% / ±2×2.5% for 20kV high‑voltage side, guarantees stable 0.4 kV output amid grid‑voltage fluctuation. |
|
Load Adaptability |
Optional Dyn11 / Yyn0. Dyn11 suppresses harmonics and copes with unbalanced single‑phase loads for industrial sites. |
|
Noise & Insulation |
Optimized core stacking reduces running noise. Class‑A upgraded insulation meets 20 kV dielectric test requirements. |
|
Cooling Method |
ONAN natural oil‑air cooling, no auxiliary fan required under rated‑load operation. |
Product Advantages
Stable performance and high energy efficiency
Features a high-quality grain-oriented silicon steel core and a step-lap lamination design. Moderate no-load loss and excitation current levels help reduce operating costs for medium-voltage distribution networks.
Exceptional short-circuit withstand capability
Utilizes an enhanced coil design (cylindrical or foil type). Balanced ampere-turn distribution improves mechanical strength, enabling the transformer to withstand electromagnetic forces generated during short-circuit faults.
Fully sealed corrugated tank: minimal maintenance required
No conservator tank is needed. The fully sealed corrugated tank design isolates the insulating oil from the atmosphere, preventing oil evaporation and ensuring long-term, reliable outdoor operation.
Flexible adaptation to 20 kV grid voltage and load requirements
The high-voltage (20 kV) side is equipped with an off-circuit tap changer (OCTC) offering an adjustment range of ±5% or ±2×2.5%. Available vector groups: Dyn11 or Yyn0. The Dyn11 configuration effectively handles harmonics and unbalanced single-phase loads in complex operating conditions.
Reliable insulation and quiet operation
Employs Class A insulation, fully compliant with 20 kV insulation test requirements. Optimized core lamination processes reduce magnetostriction effects and operating noise.
Quality assurance and broad applicability
Capacity range: 30–2500 kVA; cooling method: ONAN (Oil Natural Air Natural). Complies with IEC 60076 and GB/T 1094 standards. Every unit undergoes comprehensive factory acceptance testing. JASCO is committed to meeting international customer requirements for medium-voltage projects.
Operating Environment Conditions
- Ambient temperature: Maximum ambient air temperature: +40 °C Minimum ambient air temperature: ‑25 °C 24‑hour average ambient temperature: ≤ +30 °C Annual average ambient temperature: ≤ +20 °C
- Altitude: ≤1000 m above sea level. Special customized design required if altitude exceeds 1000 m.
- Installation location: For outdoor installation. No severe mechanical vibration and violent shock.
- Atmospheric conditions: Ambient air shall not contain corrosive gas, conductive dust, flammable or explosive substances. Relative air humidity: ≤95% at +25 °C, no condensation allowed.
- Special requirement: If on‑site operating conditions deviate from above scope, please notify JASCO in advance for tailor‑made solution.
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