Product Description
Manufactured by Yueqing JASCO Electric, the S13-M series (35 kV) oil-immersed, fully sealed, three-phase distribution transformer is a high-efficiency, energy-saving unit designed specifically for 35 kV power grids. It is widely used in regional substations, mining areas, industrial parks, and various medium-to-high voltage international infrastructure projects.
As an upgrade to the S11 series, this product utilizes superior grain-oriented silicon steel sheets. These are processed using GEORG cutting equipment and assembled via a "step-lap core" process, significantly reducing losses and lowering long-term operating costs.
The S13-M series features a cylindrical structure for its high-voltage windings, while the low-voltage windings can be configured as either cylindrical or foil types. An optimized magnetic circuit design and reliable winding fixation methods substantially enhance the unit's resistance to short circuits and transient overloads.
The S13-M series employs a corrugated oil tank (eliminating the need for an oil conservator) manufactured on a dedicated JASCO production line and treated with degreasing, phosphating, and anti-corrosion finishes. The corrugated tank walls accommodate oil volume fluctuations caused by thermal expansion and contraction, completely isolating the oil from the air; this slows insulation aging and reduces routine maintenance requirements.
The S13-M series incorporates an improved insulation structure and specialized high-voltage bushings with extended creepage distances, ensuring full compliance with insulation performance requirements for the 35 kV voltage class.
It is equipped with a voltage-regulating tap changer (with adjustment ranges of ±5% or ±2×2.5%) to adjust output voltage in response to grid fluctuations. Two vector group configurations are available: Dyn11 and Yyn0. The Dyn11 configuration suppresses zero-sequence harmonic components, effectively handling unbalanced (single-phase) loads or non-linear industrial loads. This transformer utilizes the oil-immersed self-cooled (ONAN) method, has a capacity range of 50–2500 kVA, and complies with IEC 60076 and GB/T 1094 standards.
Product Specification
|
Performance Category |
Characteristic Description |
|
Energy‑saving Performance |
Miter‑joint high‑grade silicon‑steel core; lower no‑load loss than S11 for 35kV medium‑high‑voltage grid. |
|
Short‑circuit Resistance |
Reinforced cylindrical/foil winding with firm clamping; strong mechanical resistance to short‑circuit electromagnetic impact. |
|
Sealing & Maintenance |
Conservator‑free fully‑sealed corrugated tank; oil isolated from air, slow aging, minimal outdoor maintenance. |
|
Voltage Regulation |
Off‑circuit tap ±5% / ±2×2.5% for 35kV primary side, guarantees stable secondary‑side output amid grid‑voltage variation. |
|
Load Adaptability |
Optional Dyn11 / Yyn0. Dyn11 suppresses zero‑sequence harmonics and bears unbalanced single‑phase loads for mining‑industrial sites. |
|
Noise & Insulation |
Optimized core stacking reduces running noise. Upgraded Class‑A insulation meets full 35 kV dielectric test requirements. |
|
Cooling Method |
ONAN natural oil‑air cooling, no auxiliary fan required under rated‑load operation. |
Product Advantages
High Energy Efficiency
Features a high-quality electrical steel (silicon steel) core utilizing a 45° mitered joint process. Compared to the S11 series, energy consumption is significantly reduced, thereby lowering energy losses in medium-to-high voltage (35 kV) distribution networks.
Superior Short-Circuit Withstand Capability
Utilizes reinforced cylindrical or foil windings combined with a reliable clamping system to effectively withstand the intense electromagnetic forces generated during short-circuit faults.
Fully Sealed, Low-Maintenance Tank
Eliminates the need for an oil conservator (expansion tank). The fully sealed corrugated tank isolates the oil from the air, retarding oil aging and making the transformer ideal for long-term outdoor operation.
Suitable for 35 kV Grids
Features enhanced insulation performance, optimized creepage distances, and high-voltage bushings specifically designed for 35 kV systems. Equipped with an off-circuit tap changer (±5% / ±2×2.5%); offers various connection groups (e.g., Dyn11 or Yyn0) to handle high harmonic content and unbalanced load conditions.
Reliable Insulation and Low Noise Levels
Employs upgraded Class A insulation and successfully passes power-frequency withstand voltage tests (35 kV) as well as comprehensive electrical performance testing. An optimized core design effectively reduces operating noise.
Strict Quality Control and Customization Services
Rated capacity: 50–2500 kVA; Cooling method: ONAN (Oil Natural Air Natural). Complies with IEC and national standards. As a manufacturer, JASCO provides OEM/ODM services for international orders of medium-to-high voltage equipment.
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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