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Transformers are used to change one ac voltage into another. They only work on alternating current, not direct current. At a hydro station for example, the voltage generated is quite low, and it is increased to a few kilo-volts by a transformer for sending out on the transmission lines. That choice is made because the losses on the lines are a function of the current carried, so higher voltage = lower current = lower losses. Near the customers end of the system, the voltage is dropped down to the low hundreds of volts which helps minimize the risks to the householder. The long distance transmission lines are carrying a smaller current, so they may be made smaller, thus saving copper. But at the expense of larger insulators.
Transformers are also used in their current - converting mode as well. For example, in a large factory, we don't want the thousands of amperes flowing through the meter! So a current transformer is used which (for the meter) a small but proportional current is passed to the meter.
What else can I help you with?
Does the primary winding VA equal the secondary winding VA when a transformer is loaded?
No, the primary winding VA does not necessarily equal the secondary winding VA when a transformer is loaded. The power output on the secondary side may differ from the power input on the primary side due to losses such as resistive and core losses in the transformer. The transformer's efficiency will determine how close the VA on the primary winding is to the VA on the secondary winding.
What is the voltage phase shift between primary and secondary line voltages in star-delta transformer connection?
The voltage phase shift between primary and secondary connections in a transformer is 180 electrical degrees.
What is a transformer called that increases voltage?
A transformer that increases voltage is a step-up transformer.
How step up transformer step up the input voltage?
It depends on the ratio of turns from primary to secondary.
How do you convert 480v to 120v?
to derive 120 volts from 480 volts you have to use a transformer, based on your needs. If you needed 100 amps at 120 volt single phase you would need a 12kva transformer. This is just an example.
What the purpose of the H1 terminal on a transformer?
The terminals H1 and H2 an a transformer indicate the primary side of the transformer. The secondary side is usually identified as X1 and X2.
What r the primary to secondary turns ratio in the isolation transformer?
a: 1:1 ratio its only purpose is to isolate
Why is the purpose of using core in transformer?
To maximise the magnetic linkage and flux density between the primary and secondary windings.
Why you uluminium on primary side of transformer?
This isn't the case. You can have aluminium or copper on primary or secondary side of a transformer.
The incoming voltage from the current source to the transformer is called what?
The incoming voltage from the source to the transformer is called primary voltage.
What is difference between interposing voltage transformer and potential transformer?
potential transformer is to maser and protection purpose the ivt is used for synchronicing purpose
What is the application of transformers having both primary and secondary voltage same?
When the primary and secondary voltages are the same the transformer is being used for isolation. The secondary side will have galvanic isolation from the primary side. The purpose of the is to protect secondary load if a fault occurs on the primary side. The impedance of the transformer will limit the fault current on the secondary which should save equipment.
When would you use current transformer?
A 'current transformer' (CT) is classified as an instrument transformer, which means it is used to provide a small secondary current that is in proportion to its large primary current, for purposes of metering or protection. At the same time, it electrically-isolates the secondary (metering) circuits from the primary circuits (which are often high-voltage circuits) for the purpose of safety.
The primary winding in a transformer is connected to the what?
The primary winding of a transformer is connected to the supply, while the secondary winding is connected to the load.
If a Transformer primary and secondary are equal?
You will have a 1:1 ratio isolation transformer.
Why you not use auto transformer for distribution purpose?
because autotransformer used for both purpose step up and step down but dustrubution need step down in case of this autotransformer not used for dustrubtion purpouseAnswerBecause an autotransformer (not 'auto transformer') does not provide electrical isolation between the secondary and primary.
What is the purpose of auto transformer?
Helps with the starting of large electric motors.AnswerAn autotransformer is a transformer with a single winding, rather than two separate windings. It can be used as a step-up or as a step-down transformer, provided there is no requirement for electrically-isolating the secondary circuit from the primary circuit.
