Product Description
The S13-M series 20 kV three-phase oil-immersed transformer, manufactured by Yueqing JASCO Electric, is widely used in urban and rural 20 kV distribution systems, as well as in mining operations, industrial facilities, and rural power grids. Designed in strict accordance with IEC 60076 and GB/T 1094 standards, it represents an upgrade and evolution of the S11 model.
Featuring a compact structure, the transformer utilizes high-quality copper windings precision-crafted using GEORG winding equipment and a multi-stage manufacturing process. It offers lower stray losses than the S11 series, resulting in superior energy efficiency during power distribution.
The high-voltage side employs round conductors, while the low-voltage side uses either conductors or foil windings, depending on specific requirements. Optimized magnetic circuit configurations and robust mechanical connection structures enhance the unit's resistance to short-circuit impacts and mechanical stress.
The fully sealed tank design eliminates the need for a separate oil conservator; the tank walls effectively isolate the insulating oil from the outside air, thereby slowing oil aging and simplifying routine maintenance. Manufactured on a dedicated JASCO production line, the unit undergoes comprehensive phosphating treatment for surface protection.
The S13-M 20 kV transformer is a high-efficiency solution for 20 kV grids. Equipped with a standard tap changer (voltage regulation device) offering adjustment ranges of ±5% or ±2×2.5%, it ensures a stable 0.4 kV output voltage even when the distribution grid voltage is low. It is available with Dyn11 or Yyn0 vector group configurations; notably, the Dyn11 configuration effectively suppresses zero-sequence harmonics as well as low- and high-frequency interference.
The S13-M series utilizes ONAN (Oil Natural Air Natural) cooling and covers a capacity range of 30–2500 kVA.
Product Specification
|
Performance Category |
Characteristic Description |
|
Energy‑saving Performance |
Step‑lap silicon‑steel core; lower no‑load loss than S11, realizes energy saving for 20kV medium‑voltage distribution. |
|
Short‑circuit Resistance |
Reinforced cylindrical/foil winding; strong mechanical strength against short‑circuit electromagnetic shock. |
|
Sealing & Maintenance |
Conservator‑free fully‑sealed corrugated tank; oil separated from outside air, slow aging, minimal maintenance. |
|
Voltage Regulation |
Off‑circuit tap ±5% / ±2×2.5% for 20kV primary side, ensures stable 0.4 kV output amid grid‑voltage variation. |
|
Load Adaptability |
Optional Dyn11 / Yyn0. Dyn11 restrains zero‑sequence harmonics and bears unbalanced single‑phase loads. |
|
Noise & Insulation |
Optimized core stacking for low noise. Upgraded Class‑A insulation satisfies 20 kV dielectric test requirements. |
|
Cooling Method |
ONAN natural oil‑air cooling, no auxiliary fan required under rated‑load condition. |
Product Advantages
Energy-efficient and Cost-effective
Constructed from high-quality steel, the unit offers lower loss metrics than the S11 series, ensuring long-term cost-effectiveness in 20kV centralized power distribution systems.
High Short-circuit Withstand Capability
Utilizes premium insulation materials (paper/porcelain); the system incorporates resistive elements to prevent short-circuit incidents.
Reliable Sealing and Easy Maintenance
Effectively isolates the internal components from the atmosphere to prevent premature aging; facilitates durable, long-lasting connections.
Designed for 20kV Power Systems
Features high dielectric strength and robust insulation; supports tap-changing voltage regulation (adjustment range: ±5% or ±2 x 2.5%); supports Dyn11 or Yyn0 winding configurations to meet parallel operation requirements.
Compact Structure and Superior Performance
Class A insulation design meets withstand voltage requirements for 20kV grids; optimized core design effectively reduces magnetic reluctance and ensures quiet operation.
Safe and Reliable Design
Capacity range: 30–2500 kVA; utilizes Oil-Natural Air-Natural (ONAN) cooling; complies with IEC and national standards; supports OEM/ODM customization.
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.
FAQ
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