The S13 single phase oil immersed electrical transformer is specifically engineered for single-phase power supply applications, such as rural electrification, residential pole-mounted distribution, and light commercial use. Purchasing this product provides you with a highly efficient, low-loss transformer that significantly reduces no-load losses compared to conventional S9 and S11 series, delivering measurable energy savings over its lifetime.
This transformer features a high-permeability grain-oriented silicon steel core with a stepped lap joint design, or optionally an amorphous alloy core for even lower losses. The oil-immersed cooling system ensures excellent thermal management, while the fully sealed corrugated tank structure prevents oil oxidation and moisture ingress, dramatically reducing maintenance requirements. Its compact, lightweight design facilitates easy pole-mounting and transportation.
Meets or exceeds IEC, ANSI, GB, and SANS standards
Ultra-low no-load loss, up to 30% lower than S11 series
Fully sealed corrugated tank design with no conservator
High overload capacity and superior thermal stability
Low noise operation, ideal for residential areas
Excellent short-circuit withstand capability
Compact and lightweight for pole-mounted or platform installations
Wide voltage tapping range for grid flexibility
Environmentally friendly insulating oil options available
Maintenance-free operation under normal service conditions
Q: What is a single phase oil immersed transformer?
A: A single phase oil immersed transformer is a type of distribution transformer that uses insulating oil for cooling and insulation, and is designed to operate on single-phase electrical systems. It is commonly used in residential areas, rural power distribution, and light commercial applications where three-phase power is not required. The oil immersion provides superior heat dissipation and protects internal components from environmental factors.
Q: How does the S13 series achieve higher energy efficiency than previous models?
A: The S13 series achieves higher efficiency through two key advancements: first, the use of high-permeability cold-rolled grain-oriented silicon steel with a stepped lap joint core structure significantly reduces hysteresis and eddy current losses. Second, optional amorphous alloy cores further cut no-load losses by up to 50% compared to conventional silicon steel. These improvements result in no-load loss values that are 30% lower than the S11 series and far below national energy standards.
Q: Why is the fully sealed structure important for single phase transformers?
A: Single phase transformers are often installed outdoors in areas with varying weather conditions. The fully sealed corrugated tank eliminates the need for a conservator and prevents direct contact between the insulating oil and atmospheric air. This stops moisture absorption and oil oxidation, which are the primary causes of insulation degradation. As a result, the transformer requires no oil replacement or maintenance during its service life, greatly reducing operational costs.
Q: Can this transformer be used in renewable energy applications?
A: Yes. The S13 single phase oil immersed transformer is well-suited for small-scale renewable energy systems, such as rooftop solar installations, micro-hydro projects, and residential energy storage systems. Its high efficiency and ability to handle voltage fluctuations make it ideal for stepping up or stepping down power in distributed generation setups.
Rural Electrification: Provides reliable single-phase power to remote villages, farms, and agricultural operations with minimal losses.
Residential Pole-Mounted Distribution: Ideal for residential communities where single-phase supply is standard, offering compact size and low noise.
Light Commercial Buildings: Used in small shops, offices, and rural commercial centers requiring efficient power distribution.
Renewable Energy Integration: Suitable for stepping up voltage from residential solar PV systems or stepping down from mini-grids.
Temporary Construction Power: Lightweight design allows easy deployment for temporary power needs at construction sites.
Table: S13 Single Phase Oil Immersed Transformer – Typical Specifications (11kV / 0.23kV or 0.4kV)*
|
Rating (kVA) |
HV (kV) |
LV (V) |
Impedance (%) |
No-Load Loss (kW) |
Load Loss (kW) |
No-Load Current (%) |
Weight (kg) |
Dimensions (L×W×H) mm |
|
10 |
11 |
230 |
3.5 |
0.07 |
0.38 |
2.0 |
160 |
620×520×780 |
|
20 |
11 |
230 |
3.5 |
0.10 |
0.62 |
1.8 |
210 |
680×550×850 |
|
30 |
11 |
230 |
3.5 |
0.13 |
0.85 |
1.6 |
280 |
740×600×920 |
|
50 |
11 |
400 |
4.0 |
0.18 |
1.25 |
1.4 |
380 |
860×670×1020 |
|
100 |
11 |
400 |
4.0 |
0.28 |
2.10 |
1.2 |
580 |
1040×780×1120 |
|
Note: Tapping range: ±5%, ±2×2.5%; Frequency: 50Hz / 60Hz available; Amorphous alloy core optional for further loss reduction. |
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The S13 single phase oil immersed electrical transformer core is constructed using high-permeability cold-rolled grain-oriented silicon steel with a 45° stepped lap joint design. For applications demanding the highest efficiency, an amorphous alloy core is available, reducing no-load losses by up to 50% compared to conventional silicon steel. The core is precision-sheared and stacked with semi-dry glass tape binding to minimize vibration and noise.
Both high-voltage and low-voltage windings are wound from oxygen-free copper conductors, ensuring high conductivity and minimal resistive losses. The low-voltage winding adopts a foil or helical structure with longitudinal oil ducts, significantly improving mechanical strength and short-circuit withstand capability.
High-quality mineral insulating oil is used as the standard cooling and dielectric medium. Environmentally friendly high-fire-point insulating fluids are available upon request. The oil-paper insulation system undergoes strict vacuum drying and oil-filling processes, eliminating residual moisture and air bubbles, ensuring partial discharge inception voltage well above standard requirements.
The tank features a corrugated panel design that provides both heat dissipation and thermal expansion compensation, eliminating the need for an external conservator. The fully sealed structure prevents oil oxidation and moisture ingress, ensuring maintenance-free operation for the transformer’s service life. A pressure relief valve and oil level gauge are provided as standard safety features.
Q: What quality tests are performed on each transformer?
A: Each S13 single phase transformer undergoes a comprehensive suite of routine and type tests before delivery, including no-load loss and load loss measurements, short-circuit impedance tests, induced over-voltage withstand tests, partial discharge tests, and lightning impulse tests. All test results are documented and traceable.
Q: How does the corrugated tank design contribute to reliability?
A: The corrugated tank design serves three critical functions: it increases surface area for efficient heat dissipation, provides flexible expansion capacity to accommodate oil volume changes with temperature, and creates a fully sealed environment that isolates the oil from external contaminants. This eliminates the need for an oil conservator and breather system, reducing potential points of failure and simplifying maintenance.
Q: What is the expected service life of this transformer?
A: Under normal operating conditions, the S13 single phase oil immersed electrical transformer is designed for a service life of no less than 30 years. The fully sealed construction and high-quality materials ensure long-term reliability without the need for oil replacement or core maintenance.
Lugao Power operates modern transformer production lines equipped with advanced winding, core cutting, vacuum drying, and testing equipment. We support OEM & ODM manufacturing and provide customized solutions for voltage, capacity, frequency, and international standards, ensuring stable quality and reliable delivery.
After the transformer is installed and put into operation, it is guaranteed to be leak-free, and the paint is guaranteed not to peel or fade. A 5-Year Warranty & Lifetime Technical Support is provided; any quality problems occurring under normal use within the warranty period will be covered.
All S13 single phase transformers are covered by lifetime service support, ensuring long-term availability of spare parts and technical assistance.
Service life is no less than 30 years under specified operating conditions.
In the event of equipment failure, the supplier will respond within one hour of receiving notification from the buyer, and dispatch technical personnel to the site within 24 hours domestically.
The S13 single phase oil immersed electrical transformer is manufactured in strict accordance with ISO 9001:2015/2018 quality management system requirements, ensuring that the product meets 100% quality standards prior to leaving the factory.
Our company provides comprehensive pre-sales, in-sales, and after-sales service to ensure customer satisfaction.
Our company offers a 5-Year Warranty & Lifetime Technical Support. In the event of any quality issues, we will repair or replace the product free of charge, ensuring 100% customer satisfaction.
With years of experience in manufacturing power transmission and distribution equipment, Lugao Power has established a professional production base dedicated to delivering reliable transformer solutions for global utility companies, EPC contractors, industrial facilities, and renewable energy projects.
Why Global Customers Choose Lugao
✔ Professional transformer manufacturer
✔ Modern production workshops
✔ Experienced engineering and R&D team
✔ Strict ISO 9001 quality management system
✔ Complete routine and type testing capabilities
✔ IEC, ANSI, IEEE and GB standard compliance
✔ OEM & ODM customization available
✔ Stable supply chain and fast delivery
✔ Export experience to multiple international markets
✔ Professional technical support before and after sales
Address
No. 19, Keaisi Road, Xiangyang Industrial Zone, Liushi Town, Yueqing City, China
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Share your specs: Voltage level (e.g., 11kV, 33kV), rated capacity (kVA/MVA), and installation environment (Indoor/Outdoor).
Our engineering review: We analyze your load profile and short-circuit requirements (2-4 hours).
Deliverables: You'll receive a preliminary GA drawing, technical datasheet, and commercial offer within 24 working hours.
