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Power Transformers - Supply, Installation & Maintenance

Power transformers are essential electrical devices used to transmit electrical energy from one circuit to another through electromagnetic induction. It is designed to change the voltage of the alternating current (AC) power supply to the desired level for efficient transmission and distribution.

AB Power Engineering Ltd. is one of the leading manufacturers of distribution transformers in Bangladesh combining in-house design capability, engineering innovation, highest quality materials, and the latest techniques.

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Power Transformer

Purpose of Transformer in Power Supply

The purpose of a transformer in the power supply is to step up or step down the voltage of electrical energy being transferred from one circuit to another. In a power supply system, the transformer is used to convert the voltage of the electricity to the appropriate level for the intended application.

Transformers play a critical role in power supply systems by enabling the efficient transfer of electrical energy from one circuit to another at the appropriate voltage level for the intended application.

Uses of Power Transformers in Bangladesh

Power transformers are used in various applications, including:

  • Power Solution: In power solution, transformers are used to step up the voltage of the generated power to a level suitable for transmission.
  • Transmission and distribution: In transmission and distribution, transformers are used to change the voltage level for efficient and safe delivery of electrical energy.
  • Industrial applications: In industrial applications, transformers are used for power supply and to step up or down the voltage level as required.
  • Railways: Railways use transformers to convert the high-voltage power supply to a level suitable for the trains.
  • Electric vehicles: Electric vehicles use transformers for charging the batteries.
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The Main Components of Power Transformers

Power transformers consist of several components, including:

Power Transformers of The Core
The Core

The core is made of high-grade electrical steel & provides the magnetic path for the transformer.

Power Transformers of Windings

The windings are made of copper or aluminium wire & carry electrical current.

Power Transformers of Insulation

Insulation materials are used to insulate the windings & prevent electrical breakdown.

Power Transformers of Tank

The tank is made of steel and houses the core, windings, and insulation

Power Transformers of Thermometer

It shows the actual oil temperature, and alarm & trip signals are provided as protection against loading.

Power Transformers of Tap Changer
Tap Changer

Tap changer is a device used in power transformers to adjust the transformer's output voltage.

Generated Cooling System
Cooling System

The cooling system is used to dissipate the heat generated during operation.

Power Transformers of Cooling System
Automatic Voltage Regulators

AVRs are used in a variety of applications & consist of a voltage-sensing circuit, a control circuit, and a power circuit.

Power Transformers of Accessories

Accessories are used for connecting the transformer to the power system.

Types of Power Transformers

There are several types of Power transformers & come in various types, including:

Step-Up Transformers
Step-Up Transformers
Step-Down Transformers
Step-Down Transformers
Auto Transformers
Auto Transformers
Three-Phase Transformers
Three-Phase Transformers
Scott Transformers
Scott Transformers
Instrument Transformers
Instrument Transformers

Maintenance of Power Transformers

Regular maintenance of power transformers is necessary for ensuring their optimal performance and longevity. Maintenance tasks include

  • Visual Inspections: Visual inspections are done to check for any physical damage or signs of wear and tear.
  • Electrical Testing: Electrical testing is done to measure the transformer's electrical parameters and detect any abnormalities.
  • Oil Analysis :Oil analysis is done to check for any contaminants or degradation of the transformer oil.
  • Cleaning: Cleaning is done to remove any dirt or debris that may accumulate on the transformer.
  • Repairs: Repairs are done to fix any faults or issues found during the maintenance activities.
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05 Uses of Power Transformers in Bangladesh

Transformers are used in a wide variety of industries and devices and are an essential component of modern electrical systems. There are five common uses of transformers are given below:

Electrical Power Distribution
  • Electrical Power Distribution: Transformers are used in the electrical power grid to step up the voltage of electricity generated at power plants to high voltage levels, making it easier and more efficient to transmit over long distances.
  • AC Adapters: Transformers are commonly used in AC adapters to convert high voltage, alternating current (AC) electricity from a wall outlet to lower voltage, direct current (DC) electricity that can be used to power electronic devices like laptops, phones, and chargers.
  • Welding: Welding transformers are used to convert high voltage, low current power from the electrical grid into low voltage, high current power suitable for welding.
  • Audio Equipment: Transformers are commonly used in audio equipment, such as amplifiers, to match the impedance of the amplifier output to the speaker input.
  • Lighting: Low-voltage lighting transformers are used to reduce the voltage of electricity used to power landscape and outdoor lighting.
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Specifications of Power Transformers

When choosing a power transformer for a particular application, it is important to consider various specifications to ensure that the transformer is suitable for the intended use. Some of the most important power transformer specifications are

The power rating of a transformer is the maximum amount of power that the transformer can handle.

The voltage rating of a transformer is the maximum voltage that the transformer can handle.

The frequency rating of a transformer is the frequency at which it is designed to operate.

The impedance of a transformer is a measure of the opposition to the flow of electrical current through the transformer.

The cooling method of a transformer refers to the method used to dissipate the heat generated by the transformer during operation.

It is a measure of how well it converts electrical energy from one voltage level to another.

The size and weight of a transformer are important factors to consider, as they can affect the ease of installation and transportation.
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