pole mounted transformer

1.Product Introduction

 The 35kV S11 series oil-immersed power transformers represent the mainstream energy-efficient transformers for 35kV voltage levels. Featuring high-permeability oriented silicon steel sheets, fully sealed construction, and proven manufacturing processes, these transformers demonstrate lower losses, reduced noise levels, and enhanced operational stability compared to S9 and S10 series models. Primarily designed for 35kV power transmission and distribution systems, they perform voltage conversion and energy distribution while offering energy efficiency, reliability, maintenance-free operation, and extended service life. Widely adopted in power grids, industrial/mining applications, infrastructure projects, and renewable energy sectors, they currently serve as the most prevalent energy-saving solution in 35kV distribution systems.

2. Technical Specifications（customizable）

 • Rated Voltage: 35kV±2×2.5% / 10kV / 0.4kV • Rated Frequency: 50Hz • Connection Group: YNd11, Dyn11 • Cooling Method: ONAN oil-immersed self-cooling • Capacity Range: 50kVA to 31,500kVA • Impedance Voltage: 6.5%–8% (per capacity) • Insulation Class: Grade A • Protective Structure: Fully sealed corrugated oil tank with plate-type radiator • Operating Environment: -30°C to +40°C

 3. Key Features 

1. Energy-efficient design with low operational costs: Significantly reduced no-load losses compared to S10 models, delivering outstanding energy efficiency metrics. Long-term operation ensures power savings and rapid return on investment, fully compliant with national energy conservation standards.

Low-noise operation: The iron core employs optimized magnetic circuit design and multi-stage jointing technology, resulting in minimal vibration and low noise levels, making it suitable for quiet environments such as residential areas, schools, and hospitals.

Fully sealed maintenance-free design with oil-free bearing: The fully sealed structure prevents insulation oil from contacting air, reducing oxidation and moisture absorption. This eliminates core suspension and frequent maintenance, resulting in lower operational and maintenance costs.

Strong short-circuit resistance, high mechanical strength of windings, reliable insulation structure, capable of withstanding grid surges, load fluctuations, and short-circuit impacts, ensuring safe and stable operation.

High reliability and long service life with rational heat dissipation design, corrosion-resistant and weather-resistant properties, robust overall structure, and a service life exceeding 20 years.

Highly adaptable and easy to install, suitable for indoor and outdoor applications, as well as transformer substations and power transformation stations, capable of operating in various environments including high-altitude areas, humid conditions, dusty environments, and coastal regions.

4. Application Scenarios

 • New construction, upgrading, and energy-saving retrofitting of urban/rural 35kV power grids • Power supply for large factories, mines, metallurgical plants, chemical facilities, and industrial parks • Voltage boosting systems for wind power generation, photovoltaic power plants, and energy storage stations • Power supply for hospitals, schools, commercial complexes, and high-rise buildings • Power supply for water conservancy projects, railways, highways, and municipal infrastructure • Main transformers in substations, containerized substations, and outdoor tower-type distribution systems