What Is Step Up And Step Down Transformer Pdf
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A transformer is a static device which transfers a.
- Step Up and Step Down Transformers
- Difference between Step-up and Step-down Transformer
- Difference between Step-up and Step-down transformer
- How to Make a Step-up Transformer?
A transformer in which the output secondary voltage is greater than its input primary voltage is called a step-up transformer. The step-up transformer decreases the output current for keeping the input and output power of the system equal. Considered a step-up transformer shown in the figure below. The number of turns on the secondary of the transformer is greater than that of the primary, i.
Step Up and Step Down Transformers
A Transformer is a static apparatus, with no moving parts, which transforms electrical power from one circuit to another with changes in voltage and current and no change in frequency. There are two types of transformers classified by their function: Step up Transformer and Step down Transformer.
A Step up Transformer is a device which converts the low primary voltage to a high secondary voltage i. A Step down Transformer on the other hand, steps down the input voltage i. The following images shows a simple demonstration of the use of Transformers both Step up and Step down Transformers in a typical Transmission System. In order to transmit this voltage over long distances, it is stepped up to kV using a Step up Transformer.
This voltage with increased levels is then transmitted to a distribution station. At the distribution station, the kV is reduced to 11kV using a Step down Transformer. The voltage with decreased level is then made ready for consumer use. Before going in to the details of the Step down Transformer, we will first see the working principle of a transformer in general. Also read Introduction to Transformers.
An electrical transformer works on the principle of Mutual Induction, which states that a uniform change in current in a coil will induce an E. F in the other coil which is inductively coupled to the first coil. In its basic form, a transformer consists of two coils with high mutual inductance that are electrically separated but have common magnetic circuit. The following image shows the basic construction of a Transformer.
The first set of the coil, which is called as the Primary Coil or Primary Winding, is connected to an alternating voltage source called Primary Voltage. The other coil, which is called as Secondary Coil or Secondary Winding, is connected to the load and the load draws the resulting alternating voltage stepped up or stepped down voltage. The alternating voltage at the input excites the Primary Winding, an alternating current circulates the winding.
The alternating current will result in an alternating magnetic flux, which passes through the iron magnetic core and completes its path. F is induced in the secondary winding. The strength of the voltage at the secondary winding is dependent on the number of windings through which the flux gets passed through.
Thus, without making an electrical contact, the alternating voltage in the primary winding is transferred to the secondary winding. NOTE : Depending on the construction of the transformer, the voltage at the secondary of the transformer may be equal, higher or lower than that at the primary of the transformer but the time period of the voltage i.
If the alternating voltage at the primary side of the transformer is V P and the alternating voltage at the secondary side of the transformer is V S , then the relation between the voltages at primary and secondary and number of turns of the coil in primary and secondary is given as follows.
A Step down Transformer is a type of transformer, which converts a high voltage at the primary side to a low voltage at the secondary side.
If we speak in terms of the coil windings, the primary winding of a Step down Transformer has more turns than the secondary winding. The following image shows a typical step down transformer. For example, consider the following situation. The number of turns in the primary winding of a transformer is and that in the secondary winding is If the alternating voltage at the primary of the transformer is V, then the voltage at the secondary of the transformer can be calculated using the following equation.
Hence, the voltage at the secondary winding of the transformer is 12V, which is less than that at the primary. Therefore, the transformer in this subject is a Step down Transformer. The power in a transformer is measured using the product of voltage and current. Ideally, the power in any transformer is constant i. This is even applicable to a step down transformer.
But, since the voltage at the secondary of a step down transformer is lesser than that at the primary, the current at the secondary will be increased in order to balance the total power in the transformer. We will now see how this works. Let V P be the voltage at the primary, I P be the current at the primary and P P be the power at the primary side of the transformer.
We know that the power can be calculated by simply multiplying the voltage and current. Hence, the power at the primary side of the transformer is given by. Similarly, let V S be the voltage at the secondary, I S be the current at the secondary and P S be the power at the secondary side of the transformer.
Hence, the output voltage in a step down transformer is less than that of the primary voltage and the output current is more than the input current. From the above analysis, we can define a Step down transformer as a device which converts a High Voltage and Low Current alternating source to a Low Voltage and High Current alternating supply. NOTE : The above power calculation is for an ideal transformer where there are no loses.
Practically, there will loses in the form of iron losses and copper losses that should be taken in to consideration even though the losses are small. Your email address will not be published. Comments I like this.. It is very useful for electrical engr I got some knowledge by this.
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Difference between Step-up and Step-down Transformer
The transformer is a static device that is used in electrical or electronic circuits to change the voltage in an Alternating Current AC electrical supply. It transforms electrical energy from one circuit to another with the help of mutual induction between the primary and secondary windings. Typically, the frequency of the input signal is not changed, but the voltage can be increased or decreased depending upon the need.. Before beginning to build a step-up transformer, let us understand the main parts of a transformer:. Test the bolt first for magnetization by holding it against a kitchen magnet.
The main difference between step-up and step-down transformer is that, step-up transformer increases the voltage whereas a step-down transformer decreases the voltage. The secondary voltage of step-up transformer is more than that of its primary voltage whereas the secondary voltage of step-down transformer is less than its primary voltage. In fact, these two terms, i. From construction and design point of view, there is no difference between step-up and step-down transformer. A given transformer can be used as step-up or step-down transformer. If the HV High Voltage winding is connected to supply main and LV low voltage winding to load, the transformer works as Step-down transformer. This is because, the transformer is delivering the power at a decreased voltage at secondary terminal.
Step-up and Step-down Transformers. Chapter 9 - Transformers. PDF Version. So far, we've observed simulations of transformers where the primary and.
Difference between Step-up and Step-down transformer
Transformers do what their name implies—they transform voltages from one value to another The term voltage is used rather than emf, because transformers have internal resistance. For example, many cell phones, laptops, video games, and power tools and small appliances have a transformer built into their plug-in unit like that in Figure 1 that changes V or V AC into whatever voltage the device uses. Transformers are also used at several points in the power distribution systems, such as illustrated in Figure 2. Power is sent long distances at high voltages, because less current is required for a given amount of power, and this means less line loss, as was discussed previously. Figure 1.
One of our fellow member of the EEC sent us this article few days ago. Remember you can do the same and talk about whatever you want, even yourself! Transformers are devices that change transform the voltage of power supplied to meet the individuals needs of power consumers.
How to Make a Step-up Transformer?
Equality of voltage and current between the primary and secondary sides of a transformer, however, is not the norm for all transformers. Notice how the secondary voltage is approximately ten times less than the primary voltage 0. What we have here is a device that steps the voltage down by a factor of ten and current up by a factor of ten:. Turns ratio of yields primary: secondary voltage ratio and primary: secondary current ratio.
Step-up and Step-down transformers are two categories of transformers, categorized based on their function. A transformer is a static apparatus with no moving components. It transforms electrical power from one circuit to another with changes in voltage and current and no change in frequency. In its basic form, a transformer consists of two coils with high mutual inductance that are electrically separated but have common magnetic circuit.
Step-up transformer increase the output voltage. Step-down transformer reduces the output voltage. Voltage. Input voltage is low while the output voltage is high. Input voltage is high while the output voltage is low.
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