50 kVA Oil Immersed Distribution Transformer: Technical Parameters and Typical Uses
Jan 22, 2026
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Are you specifying or procuring a 50 kVA Oil Immersed Transformer for your power distribution project? Understanding its precise technical parameters and ideal applications is crucial.
This comprehensive guide from transformer manufacturer GNEE details the core specifications, performance benchmarks, and common use cases for a standard 50 kVA Oil Immersed Distribution Transformer, helping you make an informed decision.
As a factory-direct source, we ensure clarity and reliability in every specification.
Who We Are: GNEE, Your Technical Partner in Transformer Manufacturing
GNEE is a specialized manufacturer of distribution transformers, with extensive expertise in producing reliable Oil Immersed Transformers. We are not just suppliers; we are engineers and producers who understand the critical importance of accurate technical data.
This guide is based on our real-world manufacturing experience with models like the 50 kVA Oil Immersed Transformer, ensuring the information is practical and actionable for your projects.
Core Technical Parameters of a 50 kVA Oil Immersed Transformer
The performance of a transformer is defined by its key electrical and mechanical parameters. Below are the standard specs for a typical 50 kVA Oil Immersed Distribution Transformer designed to common international standards (e.g., IEC 60076).
Primary Electrical Specifications Table
| Parameter | Standard Specification | Notes / Variants |
|---|---|---|
| Rated Capacity | 50 kVA | The base apparent power rating. |
| Primary Voltage (HV) | 11,000 V or 13,800 V | Common ratings for distribution. 33kV is also available. |
| Secondary Voltage (LV) | 400Y/230 V or 480Y/277 V | Standard 3-phase, 4-wire output. |
| Frequency | 50 Hz or 60 Hz | Region-dependent. |
| Vector Group | Dyn11 or Dyn5 | Common for distribution; others available. |
| Cooling Type | ONAN (Oil Natural, Air Natural) | Standard self-cooling method. |
Detailed Performance Data: Losses, Impedance, and Efficiency
Efficiency and losses are critical for lifecycle cost. A high-quality 50 kVA Oil Immersed Transformer from a reputable manufacturer like GNEE will feature optimized performance data.
Performance & Loss Data Table
| Parameter | Typical Value (for 11/0.4kV, 50Hz) | Importance |
|---|---|---|
| No-load Loss (Po) | ≤ 150 - 180 Watts | Represents core (iron) loss, constant when energized. Impacts base energy cost. |
| Load Loss (Pk @ 75°C) | ≤ 1100 - 1300 Watts | Represents winding (copper) loss, varies with load squared. Impacts efficiency at load. |
| Total Loss (at 50% Load) | ~ 425 Watts | Calculated: Po + (0.5² * Pk). Key for partial load efficiency. |
| Impedance Voltage (Z%) | 4% (Typical Range: 3.5% - 4.5%) | Affects short-circuit current and voltage regulation. Can be customized. |
| Sound Power Level | ≤ 50 dB(A) | Important for installations near noise-sensitive areas. |
An illustrative cutaway or labeled diagram showing the internal components (core, windings, tank) of a 50 kVA Oil Immersed Transformer.
Physical Construction & Key Components
The reliability of a 50 kVA Oil Immersed Transformer is rooted in its construction:
- Core: Constructed from high-grade, cold-rolled, grain-oriented silicon steel laminations to minimize eddy current and hysteresis losses.
- Windings: Layer-type or helical windings made of electrolytic copper or aluminum, insulated with high-temperature paper.
- Tank: Welded steel tank, sandblasted, and painted with anti-corrosion coatings. Includes radiators for heat dissipation.
- Insulating Oil: High-quality mineral oil that provides both insulation and cooling. Dielectric strength is tested before filling.
- Accessories: Standard fittings include a conservator (oil expansion tank), silica gel breather, pressure relief device, and temperature gauge.
Typical Uses and Applications
The 50 kVA Oil Immersed Distribution Transformer is a workhorse in numerous sectors due to its ideal power rating for small to medium loads:
- Commercial Buildings: Powering small shopping centers, office blocks, hotels, and restaurants.
- Light Industrial Units: Serving workshops, packaging facilities, and small manufacturing plants.
- Residential Complexes: Supplying power to apartment buildings, housing estates, and gated communities.
- Public Infrastructure: Used in water pumping stations, street lighting control cabinets, and telecommunications shelters.
- Renewable Energy: Acting as a grid-connection point for medium-sized solar PV farms or small wind turbine installations.
A 50 kVA Oil Immersed Transformer installed in a compact outdoor substation enclosure, showing typicalconnections and setting.
Selection Considerations and Customization Options from GNEE
When selecting a 50 kVA Oil Immersed Transformer, consider:
- Local Grid Voltage: Match the primary voltage to your incoming supply.
- Loss Evaluation: Lower loss values (esp. Po & Pk) mean higher efficiency and lower operating costs.
- Environmental Conditions: Specify special coatings for corrosive environments or design for higher ambient temperatures.
- Standards Compliance: Ensure it meets your local or project-specific standards (IEC, IEEE, ANSI, etc.).
At GNEE, we offer customization beyond standard specs, including special impedance values, different vector groups, and enhanced protective features.
GNEE technicians conducting the final assembly and connection check on a batch of 50 kVA Oil Immersed Transformers on the production line.
Conclusion: Optimize Your Distribution Network with the Right 50 kVA Oil Immersed Transformer
A well-specified 50 kVA Oil Immersed Distribution Transformer is fundamental to an efficient, reliable, and cost-effective power distribution system. By understanding its technical parameters and aligning them with your application needs, you ensure optimal performance for years to come.
For detailed technical consultation, specific performance data for our 50 kVA Oil Immersed Transformer, or to discuss a customized solution, contact the GNEE engineering team today.
Let us provide you with the precise technical foundation for your power project.