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Open-type 3-phase oil transformer

Open-type 3-phase oil transformer

Conclusion, three-phase oil-immersed transformers are an efficient and reliable solution for power transmission and distribution systems. With outstanding advantages in efficiency, cooling capability, durability, and ease of maintenance, these transformers are widely used in various industrial and residential applications. Understanding the structure, operating principle, and applications of three-phase oil-immersed transformers will help users optimize their use and ensure safety during operation.

Three-Phase Oil-Immersed Transformer: Introduction, Advantages, and Applications

1. Introduction to Three-Phase Oil-Immersed Transformers

Three-phase oil-immersed transformers are crucial devices in the power transmission and distribution system. With a unique design, these transformers use insulating oil to enhance insulation and cooling capabilities, ensuring high operational efficiency and long-lasting durability.

2. Structure and Operating Principle

a. Structure

A three-phase oil-immersed transformer consists of the following main components:

  • Core: The core is made from stacked electrical steel sheets, minimizing magnetic losses and enhancing efficiency.
  • Windings: The windings are made from copper or aluminum, comprising three primary coils and three secondary coils, forming a three-phase system.
  • Transformer oil: The insulating oil is used to insulate and cool the internal components.
  • Expansion tank: This tank contains transformer oil and compensates for oil volume changes due to ambient temperature variations and transformer operation.
  • Casing: The outer casing is robustly designed to protect internal components and ensure safe operation.

b. Operating Principle

Three-phase oil-immersed transformers operate based on the principle of electromagnetic induction. When alternating current flows through the primary windings, it generates a fluctuating magnetic field. This magnetic field induces voltage in the secondary windings, producing the output voltage. The insulating oil helps cool and insulate the internal components, maintaining the transformer’s efficiency and durability.

3. Advantages of Three-Phase Oil-Immersed Transformers

a. High Efficiency and Stability

Three-phase oil-immersed transformers effectively transmit electrical power with minimal losses, maintaining stable voltage and reducing energy waste.

b. Excellent Cooling Capability

The insulating oil not only provides insulation but also cools the internal components, reducing the risk of overheating and extending the transformer’s lifespan.

c. High Durability

The open design allows the transformer to dissipate heat to the surrounding environment easily, enhancing durability and reducing maintenance costs.

d. Ease of Maintenance and Repair

The open design of three-phase oil-immersed transformers allows easy access to internal components for inspection, maintenance, and repair when necessary.

4. Applications of Three-Phase Oil-Immersed Transformers

a. Industrial Power Systems

In factories, plants, and production facilities, three-phase oil-immersed transformers ensure stable and reliable voltage supply for machinery and equipment, supporting continuous production operations.

b. Substations

Three-phase oil-immersed transformers are commonly used in medium and high-voltage substations, where they step down transmission voltage to usable levels for industrial and residential areas.

c. Construction and Infrastructure Projects

In large construction projects, three-phase oil-immersed transformers ensure power supply for construction equipment and lighting systems.

5. Specifications

Main Specification
Manufacturer CTC
Country of origin Vietnam
Applicable Standard IEC 60076
Transformer Type Distribution Transformer-oil with Conservator tank
Rated Capacity Up to 20mVA
Rated Voltage Up to 36kV
Frequency 50/ 60Hz
Phase Three phase
Vector Group Dyn11, Yyn12 ( according to customers requirements )
Tap Changer No- load tap changer
Winding Material Aluminum / Copper
Cooling ONAN
Dielectric Liquids Mineral oil / Dimethyl Silicone / Vegetable oil
Type of mounting Indoor / Outdoor
Warranty Periods Up to 10 years
Accessories HV- LV Bushing
Oil Level Indicator
Pressure Relief Valve
Tap Changer
Oil Thermometer
Buchholz Relay
Dehydrating Breather
Oil Drain Valve

CTC’s transformer testing laboratory meets Vilas standards

Meet standards according to quality management systems

  •  Measurement of winding resistance
  •  Measurement of voltage ratio and check of phase displacement
  •  Measurement of short-circuit impedance and loss
  •  Measurement of no-load loss and current
  •  Dielectric routine tests
  •  Tests on on-load tap-changers, where appropriate
  •  Leak testing with pressure for liquid-immersed transformers(tightness test)
  •  Tightness tests and pressure tests for tanks for gas-filled transformers
  •  Check of the ratio and polarity of built-in current transformers
  •  Check of core and frame insulation for liquid immersed transformers with core or frame insulation

Conclusion, three-phase oil-immersed transformers are an efficient and reliable solution for power transmission and distribution systems. With outstanding advantages in efficiency, cooling capability, durability, and ease of maintenance, these transformers are widely used in various industrial and residential applications. Understanding the structure, operating principle, and applications of three-phase oil-immersed transformers will help users optimize their use and ensure safety during operation.

The transformer manufacturing plant of CTC in Vietnam

CTC specializes in providing products such as Oil TransformerAmorphous TransformerDry TransformerReactor Coiland other electrical equipment. With 15 years of experience in the field of electricity and transformer manufacturing, we are confident that we can provide you with the optimal solution