T: +86-180-67981129
E:sales@pino-electric.com
E:sales@pino-electric.com
Makou Industrial Park, Yongxiu County, Jiujiang city, Jiangxi Province, China
Pino Electric, a leading power transformer manufacturer with decades of industry experience, presents the S11 series fully sealed oil-immersed transformers, engineered to meet IEC 60076 and GB/T 1094 international standards. Designed for 10kV, 20kV, 35kV and 50Hz power transmission and distribution systems, these transformers deliver reliable power supply for residential areas, commercial streets, industrial and mining enterprises, and rural electrification projects worldwide.
Utilizing advanced manufacturing technologies and premium materials, the S11 series achieves industry-leading low loss, low noise, and high efficiency performance. Its fully sealed construction eliminates oil contamination and moisture ingress, significantly reducing maintenance requirements and environmental impact. Browse our full range of 30kVA to 1600kVA models below or contact our engineers for a customized power solution tailored to your project needs.
Model Number | Rated Capacity (kVA) | Voltage Combination (kV) | Tapping Range | No-Load Loss (W) | Load Loss (W) | No-Load Current (%) | Short Circuit Impedance (%) |
S11-M-30 | 30 | 6/6.3/10/10.5/11 → 0.4 | ±5% / ±2×2.5% | 100 | 600 | 2.3 | 4.0 |
S11-M-50 | 50 | 6/6.3/10/10.5/11 → 0.4 | ±5% / ±2×2.5% | 130 | 870 | 2.0 | 4.0 |
S11-M-100 | 100 | 6/6.3/10/10.5/11 → 0.4 | ±5% / ±2×2.5% | 200 | 1500 | 1.8 | 4.0 |
S11-M-250 | 250 | 6/6.3/10/10.5/11 → 0.4 | ±5% / ±2×2.5% | 400 | 3050 | 1.4 | 4.0 |
S11-M-500 | 500 | 6/6.3/10/10.5/11 → 0.4 | ±5% / ±2×2.5% | 680 | 5100 | 1.2 | 4.0 |
S11-M-1000 | 1000 | 6/6.3/10/10.5/11 → 0.4 | ±5% / ±2×2.5% | 1150 | 10300 | 1.0 | 4.5 |
S11-M-1600 | 1600 | 6/6.3/10/10.5/11 → 0.4 | ±5% / ±2×2.5% | 1460 | 14500 | 0.8 | 4.5 |
Model Number | Rated Capacity (kVA) | Voltage Combination (kV) | Tapping Range | No-Load Loss (W) | Load Loss (W) | No-Load Current (%) | Short Circuit Impedance (%) |
S11-M-30 | 30 | 20 → 0.4 | ±5% / ±2×2.5% | 90 | 660 | 2.1 | 5.5 |
S11-M-100 | 100 | 20 → 0.4 | ±5% / ±2×2.5% | 200 | 1650 | 1.6 | 5.5 |
S11-M-500 | 500 | 20 → 0.4 | ±5% / ±2×2.5% | 680 | 5660 | 1.0 | 5.5 |
S11-M-1000 | 1000 | 20 → 0.4 | ±5% / ±2×2.5% | 1150 | 11330 | 0.7 | 6.0 |
S11-M-1600 | 1600 | 20 → 0.4 | ±5% / ±2×2.5% | 1630 | 15950 | 0.6 | 6.0 |
All 20kV models support dual-voltage connection (10kV/20kV) via a built-in transfer switch, enabling seamless adaptation to different grid configurations without hardware modification.
Utilizing premium cold-rolled grain-oriented silicon steel sheets and an optimized stepped-lap core structure, the S11 series reduces no-load losses by up to 20% compared to traditional S9 series transformers. For a 1000kVA unit operating 24/7, this translates to approximately $1,200 in annual energy cost savings, delivering full return on investment within 3-5 years. All efficiency claims are validated by third-party power testing laboratories and comply with EU Ecodesign Directive 2009/125/EC.
Through innovative core clamping technology, precision winding arrangement, and advanced sound-dampening materials, operational noise is reduced to ≤55dB at 1m distance. This meets strict residential and commercial noise regulations, eliminating costly noise complaints and avoiding transformer relocation expenses.
The fully sealed corrugated oil tank design completely isolates the transformer oil from external air and moisture, preventing insulation degradation and oil oxidation. This extends the transformer's service life to 25+ years and eliminates the need for annual oil changes and filtration. Compared to open-type transformers, maintenance costs are reduced by 70% over the product lifecycle.
A specially designed braced winding configuration with high-tensile copper conductors enhances the transformer's ability to withstand 200kA short-circuit currents without structural damage. This minimizes unplanned downtime, prevents cascading grid failures, and protects connected electrical equipment. Compliant with IEC 60076-3 short-circuit withstand standards.
Suitable for both indoor and outdoor installation, the S11 series features a compact footprint and lightweight design, reducing transportation and installation costs. Custom adaptations are available for harsh environments, including high-altitude derating, corrosion-resistant coatings for coastal areas, and flame-retardant oil options.
To ensure optimal performance and longevity, install the S11 series transformer under the following conditions. Ambient temperature range is -25℃ to +40℃, with maximum monthly average relative humidity of 90% at 20℃. Maximum operating altitude is ≤1000m, and customized solutions are available for altitudes up to 3000m. The installation location must be free from fire, explosion hazards, severe pollution, chemical corrosion, and violent vibration. Maintain minimum 1m clearance around the transformer for ventilation and maintenance access.
Our technical team provides on-site installation guidance and commissioning services for bulk orders, ensuring compliance with local electrical codes and safety standards.
We understand that every project has unique power requirements. Pino Electric offers comprehensive customization for S11 series transformers. Available options include voltage ratings from 6kV to 35kV with custom tapping ranges, connection groups of Yyn0 or Dyn11 per customer specifications, cooling methods of standard ONAN or high-load ONAF, special adaptations such as high-altitude derating, salt-spray resistant coatings, flame-retardant mineral oil and stainless steel tanks, dual-voltage conversion for 10kV/20kV switchable input, and a full range of accessories including Buchholz relays, temperature indicators, pressure relief valves and remote monitoring systems.
Tell us your specific project requirements, and our senior electrical engineers will design a tailored transformer solution within 48 hours.
Each S11 transformer undergoes 12+ comprehensive tests before shipment, including insulation resistance test, dielectric strength test, short-circuit withstand test, no-load loss test, and oil quality analysis. All test reports are provided with every shipment.
All products comply with IEC, GB, and CE standards. Third-party certification including UL, CSA and KEMA is available upon request.
Our production facilities operate under ISO 9001:2015 quality management systems and ISO 14001:2015 environmental management systems.
We source premium materials from trusted global suppliers, including silicon steel from Nippon Steel and copper wire from Luvata.
We offer a 2-year standard warranty covering all manufacturing defects. Extended warranty options up to 5 years are available for critical infrastructure projects, including annual maintenance inspections and priority technical support.
The S11 series oil-immersed transformers are ideal for a wide range of B-end applications. These include utilities and power grids for substation distribution, rural electrification projects and grid expansion upgrades, industrial and mining facilities such as manufacturing plants, mining operations, oil and gas facilities and chemical processing plants, commercial and residential spaces including shopping malls, office buildings, residential complexes, hotels and hospitals, renewable energy integration for solar and wind farms, and critical infrastructure such as water treatment plants, data centers, transportation hubs and military installations.
The S11 series features an optimized core structure and premium silicon steel materials, resulting in 20-30% lower no-load losses compared to the S9 series. This translates to significant long-term energy cost savings. The S11 series also includes improved noise reduction and a fully sealed design for longer service life and lower maintenance.
With proper installation and minimal maintenance, the S11 series transformers have a service life of 25+ years. The fully sealed design prevents oil contamination and insulation degradation, which are the primary causes of transformer failure.
Yes, we provide custom voltage ratings from 6kV to 35kV for the high-voltage side and 0.4kV for the low-voltage side. We also offer custom tapping ranges to accommodate specific grid voltage fluctuations.
The fully sealed design eliminates the need for annual oil changes and filtration. Routine maintenance only requires visual inspections for leaks, corrosion, and proper ventilation. We recommend a comprehensive oil analysis every 5 years for transformers operating in harsh environments.
Our MOQ is 1 piece for standard models. For custom configurations, please contact our sales team for lead time and pricing information.
Yes, we ship to over 40 countries worldwide via sea, air, and land freight. For bulk orders, we offer on-site installation guidance, commissioning, and operator training services.
