Advantages And Disadvantages of AC Transformers - Unacademy

A transformer is an electrical device that transfers electrical energy from an alternating current circuit to one or more other circuits, also used primarily to increase or decrease voltage. A transformer is made of two electrically isolated coils that work on the Faraday principle of mutual induction. During this process, an emf is induced in the secondary coil of the transformer by a change in the magnetic flux flowing in the primary coil winding.

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To avoid wastage of energy in a transformer, a magnetic field is created between the transformer core primary and secondary coil, which directs the path of current flowing. The electrons start moving when the magnetic field is created within the secondary coil, resulting in the creation of an electric current through electromotive force.

Advantages of AC Transformers

Some of the advantages of AC transformers are as follows:

1. Isolation and Productivity: The conventional transformer has a simple design based on efficiency. In addition, it also provides galvanic isolation, as the two windings do not have any electrical connection between. It also transfers all the energy to a transformer in the process of magnetic coupling. 

The basic structure of conventional transformers has remained the same over the past decades, but advances in material technology have resulted in higher saturation densities and lower hysteresis losses in transformers, resulting in an efficiency of about 97 per cent for even very efficient transformers.

2. Power Transmission and Distribution: AC transformers are considered to be one of the most important components of the power system, which includes power generation, transmission and distribution. Transformers have made it possible to distribute electric power over large distances at a reasonable cost. 

Power transformers provide highly efficient and long-distance power transmission, which helps to step up the voltage to a higher level on the output. The distribution system is used by distribution transformers to step down high voltage.

3. Stepping Voltage and Current Up and Down: Transformers are important components in both power distribution and power electronic systems. They can reduce the high voltage in transmission at substations as well as increase the amount of current required by the end-users.
4. Efficiency in Terms of Costs: For voltage level change and isolation, a conventional transformer is a great alternative to a low-cost, high-efficiency transformer that does not have a high overall transformer cost.
5. Wide Range of Applications: The efficiency of the different types of transformers, regarding power, distribution, potential, and isolation, is almost the same. They all work on the same concept, although they have different applications. 
6. Reversed Linked: Typically AC transformers can be reverse linked, which means the same transformer can be wired as step-up or step-down, depending on how it is installed by the manufacturer. The manufacturer must allow and specify this reversibility capability.

Disadvantages of AC Transformer

AC transformers have a few flaws. Some of the disadvantages of AC transformers are discussed below:

1. Cooling is Required: In a transformer, high temperatures severely reduce the lifespan of the insulating materials used in the windings. A transformer’s capacity is increased by increasing its cooling rate. As a result, maintenance of the cooling system, such as the fans, radiators, heat exchangers, and oil pumps, is vital.
2. Works only in Alternating Current (AC): Because a transformer does not pass DC, it can be used to prevent the DC voltage on an amplifier stage output from impacting the bias of the next amplifier. Between amplifier stages, the AC signal is connected through the transformer.
3. Transformer Losses: Transformers are electrical machines that are widely used in transmission and distribution systems to step up and step down voltage levels. Even if they operate at very high efficiencies, there is a potential for loss due to the high volt-ampere value ​​and the number of transformers installed in the power system. Iron losses are particularly important among the losses because the transformer is constantly energised, which consumes significant energy in the core, as well as the load losses that occur when the transformer is overloaded
4. Large size: Transformers are large and heavy and require a lot of space. There have been extensive studies to reduce the size and weight of transformers. Since transformers directly transform the voltage, it sends undesirable voltage sags, dips, and frequency variations to the output.
5. Power Quality is Poor: Transformers have a limited voltage regulation where additional flexible AC transmission systems are needed to control power quality.
6. Voltage Drops and Frequency Shifts: The voltage at the output in a transformer is also a direct representation of the voltage at the input, in which any undesirable input such as voltage dip or frequency variation can be observed at the output. Due to this losses like voltage drops and frequency shifts are seen.

Conclusion

Transformers are used for a wide range of applications. A transformer, for example, is frequently used to reduce the voltage of conventional power circuits in order to operate low-voltage devices and to raise the voltage from electric generators in order to transmit power over long distances. Transformers play a significant role in our daily lives since they adjust the alternating current and deliver a consistent amount of electricity to the device. This ensures smooth operation and long life not only of a device but also of the transformer.

In this modern technological era, an uninterrupted power supply is the need of the hour. Every device has a unique purpose and will have its own power needs. The equipment used for industrial purposes will require a much higher voltage than that of the equipment used for domestic purposes.

The Power produced in the generation plants cannot be consumed directly because of two reasons.

Firstly, the power received at the distribution station will be very much lesser than the power generated due to various losses during transmission. Secondly, the distributed power voltage will not be apt for applications across utilities. So we need a device that can match for the losses incurred and also modify the voltage that suits diverse applications. A Step-up transformer serves exactly the same purpose.

In this blog post, we will understand its objective and will weigh the pros and cons of a Step-up transformer.

What is a Step-up Transformer?

A Step-up transformer is an electrical device whose output voltage is higher than that of its input voltage. Let’s say you need to operate electrical equipment that requires 440 V and the main power supply is 220 V, the step-up transformer will increase the 220 V to a certain amount that will fulfill the power requirement of the given equipment.

Step-up transformers are an integral part of the power generation and transmission system. In general, power generating plants are situated far from inhabited places, and the electricity is needed to be transmitted to the point of utility. So a step-up transformer is employed to transform the present power source to a suitable voltage.

At the power station, a step-up transformer steps up the voltage and steps down the current to maintain a constant power level. By reducing the current, Power losses (I2R losses) are minimized. At the distribution stations, the voltage and current are modified corresponding to the generated voltage. As these transformers amplify the voltage to the desired level, they are employed in various applications to fulfill the individual needs of power consumers.

Principle and Construction

A Step-up transformer is typically made up of windings and core along with its enclosures. An assembly of thin Silicon steel tightly clamped and laminated to let the magnetic flux flow with less loss forms the core of the transformer. A well-laminated iron core is most commonly used in transformer construction.

A step-up transformer as like any other transformer consists of two sections – Primary and Secondary.

The primary section contains fewer turns of wire compared to the secondary one. The windings are made of either copper or aluminum that is wound around the core. This is designed in such a way that the primary winding can carry low power voltage compared to the secondary winding which carries high voltage power.

A step-up transformer is used to convert a high-current, low-voltage input to a low-current, high-voltage output applying the principles of electromagnetic induction. The alternating current in the primary winding produces a changing magnetic field in the iron core. This magnetic field then induces the alternating current in the secondary coil. Since the turns of wire on the secondary are more than that on the primary, the received voltage will be boosted up. Thus the output voltage will be higher than that of the input voltage.

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Besides Power transmission, Step-up transformers have their applications in electronic systems like inverters and stabilizers to regulate the voltage from low to high.

Step-up transformers play a key role in industries such as steel, textiles, and food processing and also in residential and commercial spaces.

Advantages of a Step-up Transformer

Transformers can come in different specifications suitable for different applications and each comes with its own advantages and disadvantages. Choosing the right step-up transformer for your company is a very critical decision as it impacts the productivity of the industry. So it is very essential to learn the pros and cons of an electrical device before purchasing one. Here are a few advantages of the step-up transformers.

Long-Distance Transmission

Step-up transformers are used to transmit power over long distances at low costs. If it were not for a step-up transformer, the power loss in the transmission lines would be so high and it would become close to impossible to transmit power to far-off regions. How does it do this? Well, when the voltage of the current that has to be transmitted is increased, the resistance on the line is reduced, thus, ensuring very minimal losses along the way.

Uninterrupted Operation

Any electrical/electronic device needs to be switched off for a few hours a day, for it to perform optimally (Yes, your mobile needs rest too). Continuous running of electrical equipment can negatively impact its performance. But not in the case of a step-up transformer. They have the capability of operating continuously due to their construction. This is yet another reason why they play a vital role in power distribution systems.

High Efficiency

As we have seen, the step-up transformers minimize losses to a greater extent which makes them more efficient. With the use of cutting-edge technology and great manufacturing processes, transformer manufacturers have made significant improvements to provide optimum efficiency. A standard step-up transformer operates at more than 95% efficiency.

Low Maintenance

Step-up transformers do not require constant maintenance and cut low on maintenance costs. Most of them need only minimal maintenance such as oil checks, repairing any corroded or damaged parts, cleaning the contact, etc., and don’t require much time or money.

No Starting trouble

Once the step-up transformer is installed and connected to the load, it can operate immediately without any delays.

Disadvantages of a Step-up Transformer

Now that you know the advantages and applications of a step-up transformer, it is equally wise to know the disadvantages of a step-up transformer. This aids in planning and making necessary arrangements that helps you to make efficient use of the transformer.

Demands a Cooling System

One of the major disadvantages of a step-up transformer is its need for a cooling system. As it operates 24/7, it heats up a lot and there have to be some means to cool it down. As they are used in highly critical applications, switching them off even for a few minutes can cost a lot to the industry.

On the other hand, too much heating can reduce the lifespan of the transformer. So it becomes necessary to install a cooling system that runs round the clock to suck out the heat produced.

Hefty Device

As the voltage to be stepped up increases, the size of the transformer also increases, as it depends on the number of windings on the core. In other terms, the higher the output voltage, the bulkier is the transformer. Apart from this, the cooling system used also contributes to the overall weight of the step-up transformer. It takes up a lot of space.

Exclusive for AC

As a step-up transformer works only for AC (alternating current) voltages, its applications are limited only to AC operations. It does not do well for direct current or DC voltages.

Conclusion

Choosing the right transformer manufacturer makes a major difference by returning great value for money. EVR Electricals is one of the established and trusted manufacturers of step-up transformers in Chennai. We have a comprehensive range of superior quality step-up transformers to suit client specifications. Our products are available in different power capacities and are appreciated for noiseless operations. Get your quote now! 

Do you have any questions for us? Please feel free to comment below. Have a great day!

FAQS

1.Why do we step up the voltage for transmission?  

 Normally electricity is generated in power stations and is transmitted to long distances by power lines. The resistance in the power line increases as the distance of transmission increases. So the power companies try to boost the voltage by many KVs before it is transmitted to the power line. (This reduces the current and minimises the power lost in the power lines)

2. How does a step-up transformer increase efficiency?

 The efficiency of a transformer is determined by the ratio of output energy to input energy. At the source of power generation (power station), a step-up transformer steps up the voltage and steps down the current. This increases the efficiency in transmitting current in the overhead cables with minimal losses. 

3. What is Step-up Transformer? 

 Step-up transformer: Step-up transformers are used to boost the voltage from the primary winding to the secondary winding keeping the power constant in both windings. The core of the transformer is made up of laminated thin silicon steel and is assembled and tightly clamped. When we step up the voltage, the current is stepped down. This factor makes the current flowing in the overhead cables relatively less and enables them to distribute to long distances. They form an important part of the power generation and distribution system. They are used in electronic devices like inverters, batteries and stabilizers.

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4. Use of a step-up transformer?