100KVA 20KV Three Phase Oil Immersed Transformer

This 100KVA 20KV Three Phase Oil Immersed Transformer, produced in China by GUANGBIAN, stands out due to its Yzn5 connection group. It is a connection configuration where the high-voltage winding adopts a star connection (Y connection), the low-voltage winding uses a zigzag connection (derived from delta connection), the neutral point on the low-voltage side is drawn out, and the phase relationship between the high and low-voltage windings is identified using the "clock method".

This Three Phase Transformer is used by our customers in precision machine tool workshops that demand high power supply quality, serving to reduce equipment failures caused by harmonic interference.

It is commonly installed in:

Industrial power distribution systems

Rural electrification projects

Small substations

Infrastructure and construction sites

Commercial and utility power networks

Compared with dry-type transformers, oil-immersed transformers provide better cooling performance and higher overload resistance, making them more suitable for outdoor and heavy-duty applications.

Key Features & Advantages

1. Stable Performance in 20KV Medium Voltage Systems

Designed for 20KV distribution networks, ensuring stable voltage conversion and reliable operation even under fluctuating grid conditions. It improves overall power system stability and equipment protection.

2. High Efficiency with Low Energy Loss

Optimized core and winding design significantly reduces no-load and load losses, helping lower long-term energy consumption and operational costs.

3. Oil-Immersed Cooling for Strong Heat Dissipation

The ONAN oil-immersed cooling system ensures efficient heat removal, supporting continuous full-load operation and extending insulation lifespan.

4. High Overload and Short-Circuit Strength

Built for industrial environments, it withstands motor start-up surges and short-circuit stress, ensuring safe and stable operation under heavy load conditions.

5. Compact Structure, Easy Installation

Space-saving design with simple installation and low maintenance requirements, making it suitable for both new and retrofit power distribution projects.

Product Parameter

Operating Environment Requirements

1.  Temperature Range

◦ Standard operation: -25℃ ~ 45℃

◦ Ambient temperature shall not exceed 40℃ for long-term continuous operation (to ensure ONAN cooling efficiency).

2. Relative Humidity

◦ Maximum 95% (at 25℃ ambient temperature)

3. Altitude

◦ Standard adaptation: ≤1000m above sea level

◦ High-altitude customization: ≤3000m (with enhanced insulation and optimized heat dissipation, optional).

4. Installation Site

◦ Indoor or outdoor (outdoor installation requires IP23 protection grade, optional; indoor default IP20).

- Stay away from flammable, explosive, corrosive gases and dust sources.

◦ No severe vibration (vibration acceleration ≤0.1g) or mechanical impact.

5. Ventilation Condition

◦ Adequate ventilation space: ≥0.5m clearance around the transformer for natural air circulation (critical for ONAN cooling).

◦ Avoid enclosed spaces without air flow to prevent overheating.

6. Power Grid Environment

◦ Frequency compatibility: 50Hz / 60Hz dual-frequency adaptable.

◦ Voltage fluctuation: ≤±5% of rated input voltage (20KV) to ensure stable operation.

What Problems it solves?

In real power distribution systems, equipment failure is often caused by unstable voltage, overload surges, and heat accumulation.

This transformer is designed to solve:

● Voltage instability in 20KV medium-voltage networks

● Frequent motor starting impact in industrial systems

● Overheating issues during continuous operation

● Energy loss in long-term power distribution

● Unreliable performance in harsh outdoor environments

By addressing these system-level problems, it ensures stable and efficient power delivery in demanding applications.

Our Factory

Sheet metal workshop

Foil winding workshop

Winding workshop

Winding oven workshop

Transformer assembly workshop

Transformer commissioning workshop

Why Choose Oil Immersed Transformer?

Compared with dry-type transformers, oil immersed transformers offer:

● Better heat dissipation performance

● Higher overload capacity

● Longer operational lifespan

● More stable performance under heavy load

For 20KV distribution systems, oil-immersed design is often the preferred solution for outdoor and industrial applications.

Quality Control & Manufacturing Assurance

Each transformer is manufactured under strict quality control procedures to ensure stable performance and safety compliance.

Testing includes:

● Routine electrical performance testing

● Insulation resistance testing

● Temperature rise test

● Load and no-load loss testing

● Short-circuit withstand evaluation

Manufacturing follows international standards to ensure reliability in global markets.

Maintenance & Service Life

100KVA 20KV Three Phase Oil Immersed Transformer is designed for low maintenance requirements. With proper installation and periodic inspection, the service life can exceed 20–25 years.

Recommended maintenance includes:

● Regular oil condition checks

● Terminal connection inspection

● Temperature monitoring

● Cleaning of external components

FAQ

1. Can this transformer operate continuously for 24 hours?

Yes, it is designed for continuous operation under rated load conditions.

2. Is the 100KVA transformer suitable for outdoor installation?

Yes, oil-immersed transformers are suitable for both indoor and outdoor environments.

3. Can the voltage be customized?

Yes, primary and secondary voltages can be customized based on project requirements.

4. What is the main advantage of 20KV system compatibility?

It allows stable integration into medium-voltage distribution networks with reduced transmission loss.

100KVA 20KV Three Phase Oil Immersed Transformer is a reliable and efficient solution for medium-voltage power distribution systems. With its strong overload capacity, low energy loss design, and durable oil-immersed cooling structure, it provides stable long-term performance for industrial and utility applications worldwide.