Electrical transformers, their types and components
Electrical transformers are considered one of the important electrical and electronic components that are used in many different applications in order to raise or lower the voltage and electric current.
The need to use electrical transformers in generating stations to raise voltages for specific values has begun because of the need to transfer power for less loss and costs and to reduce the size of connectors in the grid which is used to feed electric loads with suitable voltages.
What is the electrical transformer?
Transformer is defined as a static electrical machine (non-moving) whose function is to convert an alternating current of a certain voltage into another alternating current of a different voltage, either by rise or fall with constant capacity and frequency, and the electrical transformer is used to transfer electrical energy from the places of its generation to the places of consumption.
Electrical transformer components
It is a set of thin sheets of magnetic iron, the thickness of which ranges from (0.35 mm) to (0.5 mm), and they are isolated from each other to overcome the phenomenon of eddy currents.
The working principle of an electric transformer:
When the primary coil of the transformer is connected to the electrical source, the alternating current passes through a magnetic flux component that cuts the secondary coil through the magnetic circuit consisting of the iron core.
Note: The amount of driving force in electrical transformers depends mainly on the number of turns in each coil.
Types of electrical transformers:
Classification of electrical transformers according to the shape of the iron core:
Classification of electrical transformers in terms of voltage level:
Classification of electrical transformers according to the number of phases:
The difference between transformers, generators and motors
Although the term Electric Machine always applies to generators and motors of all kinds, the transformer is also considered a type of electrical machine, because the laws governing the work of motors, generators, and transformers are the same, which are the laws of electromagnetism.
The only difference between motors and generators on the one hand, and between transformers on the other hand, is that motors and generators depend on the principle of motion (rotating), while transformers are static electrical machines that do not rotate. Other than that, they are all subject to the laws of electromagnetism.
Electrical Transformer uses
Advantages of using electrical transformers
The main advantage of transformers in the electric power system is to reduce the value of the current transmitted through lines and cables, and this feature entails several other advantages:
The importance of electrical transformers
The importance of electrical transformers mainly lies in converting the electric power that enters it with a certain voltage into an electric power that comes out of it with a different voltage, whether by increase or decrease.
The electric transformer is used as a main component in the transmission lines in order to transmit electrical energy with high voltages over long distances with the least possible losses in energy.
Ways to connect three-phase transformers:
Three phase circuits can be connected in different ways, including:
Since the transformers consist of two primary and secondary circuits, each circuit can be connected in a delta or star manner. This means that there are four ways to connect three-phase transformers, namely:
Why is the power of electrical transformers measured in volt.ampere and not in watts?
The capacity of transformers is measured in volts.ampere for two reasons:
Atlas for Support and Services has distinguished practical experiences in inspection, preparation and testing services for electrical transformers, starting from the manufacturing stage of the electric transformer and ending with installation and maintenance through a team of highly experienced engineers and technicians using the latest testing equipment and various tests. In addition, Atlas grants quality and safety certificates for the various electrical transformers and accreditation certificates International standards for electrical transformers such as ISO / IEC.
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