What is the Transformer?
A transformer is a static, passive electrical device that transfers the electrical energy galvanically between two or more circuits.
The changing current in a coil produces a changing magnetic flux in the same coil, which in turn induces a varying emf (electromotive force) across another winding, wounded on the same core.
This electrical energy is transferred between the two coils magnetically without being electrically connected. The transformers are rated in VA, KVA or MVA .
Transformers are used to either step up or step down the alternating voltage.
The transformers may be step up transformers or step-down transformers depending upon the primary and secondary windings.
What is a Step up Transformer?
A step up transformer is a transformer that step ups the voltage from the primary winding to the secondary winding while keeping the power same in both the windings at the rated frequency.
Where are the Step up Transformers used?
The step up transformers are generally used in generating stations and other power transmission applications. The primary windings of the power transformers at the power generating stations are supplied with the lower voltage to give a higher voltage at the other end of the transmission lines.
How are Step up Transformers constructed?
The step up transformers are constructed of windings, core, enclosure, and other accessories.
Core of Step up Transformer –
The core of the transformer is constructed from a highly permeable material. Laminations of thin silicon steel are assembled and tightly clamped to form the core.
This core is designed to allow magnetic flux to flow through them quickly with minimum losses.
The core material has a higher permeability than the surrounding air. This high permeability of the core material makes the magnetic field lines restricted in the core material and thus increases the efficiency of the transformer by reducing the losses of the transformer.
The magnetic cores though are advantageous in permitting the magnetic flux flow across them but also leads to core losses such as eddy current losses due to hysteresis. Therefore, low coercivity and hysteresis materials are preferred for making magnetic cores, like silicon steel or ferrite.
The core of transformers is laminated to keep the eddy currents at a minimal low to prevent the heating of the core. The electrical energy got wasted in heating the core and thus decreased the efficiency of the transformer.
Windings of Step up Transformer –
The windings of the transformers are meant to carry currents and are wounded over the core. These windings are insulated and are designed to keep the transformer cool and to withstand the operational and test conditions. The windings are of copper or aluminium.
The primary windings comprise of thick wire with a smaller number of turns on the core, while the secondary windings comprise of thin wires with a large number of turns. The primary windings are designed to carry low voltage at a higher current, whereas the secondary windings are designed to carry higher voltages at a lower current. The power across both the windings, however, remains the same at any point of time;
The copper windings, though expensive, bear higher mechanical strength and carries 1.6 times higher current than the aluminium windings. Silver bearing copper windings have greater strength and is required where higher extreme forces are there. These copper wounded transformers are preferred where the smaller ratings of the transformers or the compact transformers are required.
The aluminium windings are lighter as well as less expensive, though a large cross-section of aluminium is required as they carry less current than copper. These windings are preferred where the price is the criteria, and space is not an issue. They are generally preferred to transfer higher kVA rating power to large distances.
How is Set-up Transformer price decided?
The set-up transformers are available at different prices from different manufacturers depending upon the type of transformer, manufacturer, utility, and availability. On broader spectrum here are few of the critical factors which decide the price of the transformers.
-
Rating of the Transformers
– The rating of the transformer is the prime factor to decide the rate of the transformer. Same rating transformer from different manufacturers is priced differently.
-
Winding Material
– The type of winding material is the second important attribute for deciding the price of the transformer. The Aluminium wounded transformers are much more reasonable than the copper wound transformers.
-
The efficiency of the Transformers
– The efficiency of the transformer plays a significant role in deciding the price of the transformer. As the transformers are designed for twenty-four hours operation, therefore even a slight difference in the efficiency of the transformer has a major impact on their price. Higher the efficiency, the higher will be the price.
-
Cooling Medium –
The cooling medium is the next major factor to decide the price of the transformer that whether the transformer is air-cooled or oil-cooled. The air-cooled transformers are much more economical than the oil-cooled transformers.
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Number of Phases –
The number of phases that is whether the transformer is a single-phase or three-phase is the next attribute to differentiate the transformers on the price.
Conclusion
– The step up transformers are an important part of power generation and transmission system. They are playing a vital role in transferring the power to far off places from the generating stations. As these generating stations are generally situated at far of inhabited places and the electricity is required to be transferred to the point of utility, these transformers become an indispensable part of the electrical system.
We, Servostar servo Voltage Stabilizers are an established renowned manufacturer based out of India and are catering to entire pan India in power equipment like Servo Stabilizers and all type of transformers including isolation transformers for domestic households and other industries. We have a proven track record of supplying quality transformers and voltage stabilizers to various industries, commercial setups, residences, and the utility. We do provide consultancies also.
1) What is a step up transformer?
A step-up transformer is a transformer that increases the voltage from the primary coil to the secondary coil while managing the same power at the rated frequency in both coils. It converts low voltage & high current from the primary side to the high voltage & low current on the secondary side of the transformer.
2) What is the use of a step up transformer?
Step Up transformers are used in electronic equipment like inverters, batteries & stabilizers to balance the low voltage to the higher voltage in the Transformers. They are also used in electrical power transmission.
3) What is the difference between step up and step down transformer?
Difference between the step up transformer and the step down transformer are given as below;
Step Up transformers increase the voltage while the step down transformers reduce voltage.
The step-up transformer reduces the current strength while the step-up transformer increases the current strength.
In a step-up transformer, the number of turns in secondary winding are higher than that of the primary winding but in a step down transformer the number of turns in primary winding are higher than that of the secondary winding.
In a step-up transformer, the wire of the primary coil is thicker than that of the secondary coil whereas in a step down transformer thewire of the secondary coil is thicker than the primary coil.
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