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Single-Phase Oil-Immersed Transformer
Single-Phase Oil-Immersed Transformer is a reliable power distribution device used to step down or step up single-phase alternating current (AC) voltage for various electrical systems. It is widely deployed in rural and urban distribution networks, residential and commercial areas, industrial facilities, and lighting applications where single-phase power supply is required.
Featuring robust design, efficient performance, and long service life, single-phase oil-immersed transformers are an essential solution for dependable energy delivery in both overhead and pad-mounted installations.
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Single-phase oil-immersed transformer consists of a magnetic core, primary and secondary windings, and insulating oil enclosed in a robust tank. The core is typically made from high-permeability silicon steel lamination to reduce core loss, while the windings are wound with copper or aluminum conductors for efficient energy transfer. The insulating oil serves both as a cooling medium and as dielectric protection for internal components.
Key Features of Single-Phase Oil-Immersed Transformer
Oil-Immersed Cooling and Insulation
The transformer uses high-quality insulating oil to submerge the core and windings, which provides effective heat dissipation, enhances dielectric strength, and supports stable operation under continuous load and varying ambient conditions.
Compact and Space-Efficient Design
Single-phase units are typically smaller and lighter than three-phase counterparts, making them easy to install in tight spaces such as rooftops, poles, or pad-mounted enclosures.
High Efficiency & Low Losses
Optimized core and winding designs using cold-rolled silicon steel and quality copper conductors ensure low no-load and load losses, improving overall energy efficiency and reducing operational costs.
Reliable Operation
The fully sealed oil tank and rugged construction provide strong short-circuit resistance, excellent insulation performance, and long-term reliability in a wide range of environmental conditions.
Versatile Applications
Ideal for residential communities, lighting distribution, small commercial loads, agricultural systems, and remote power grids where single-phase power conversion and distribution are needed.
Applications of Single-Phase Oil-Immersed Transformer
Single-phase oil-immersed transformers are widely used in:
Residential Power Distribution – stepping down medium voltage to usable low voltage for homes.
Lighting Networks – street lighting and public facility lighting systems.
Rural and Remote Power Grids – providing stable power in open-line networks.
Small-Scale Commercial and Industrial Loads – small shops, workshops, and agricultural equipment.
Benefits of Single-Phase Oil-Immersed Transformer
Low Maintenance – simplified structure with fewer moving parts reduces maintenance needs.
High Reliability – sealed construction and quality materials ensure steady performance.
Energy Efficient – optimized design leads to lower losses and better efficiency.
Cost-Effective – lower installation and lifecycle costs make it a practical choice for many distribution projects.
Technical Parameters of Single-Phase Oil-Immersed Transformer
| KVA | Primary Voltage(V) | Primary Current(A) | Secondary Current(A) | ||
|---|---|---|---|---|---|
| 120/240V | 240/480V | 277V | |||
| 10 | 19920 | 0.50 | 41.7 | 20.8 | 36.1 |
| 15 | 0.75 | 62.5 | 31.3 | 54.2 | |
| 25 | 1.26 | 104.2 | 52.1 | 90.3 | |
| 37.5 | 1.88 | 156.3 | 78.1 | 135.4 | |
| 50 | 2.51 | 208.3 | 104.2 | 180.5 | |
| 75 | 3.77 | 312.5 | 156.3 | 270.8 | |
| 100 | 5.02 | 416.7 | 208.3 | 361.0 | |
| 167 | 8.38 | 695.8 | 347.9 | 602.9 | |
| 250 | 12.6 | 1041.7 | 520.8 | 902.5 | |
| 333 | 16.7 | 1387.5 | 693.8 | 1202 | |
