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.
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.
The voltage phase shift between primary and secondary connections in a transformer is 180 electrical degrees.
A transformer that increases voltage is a step-up transformer.
It depends on the ratio of turns from primary to secondary.
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.
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.
a: 1:1 ratio its only purpose is to isolate
To maximise the magnetic linkage and flux density between the primary and secondary windings.
This isn't the case. You can have aluminium or copper on primary or secondary side of a transformer.
The incoming voltage from the source to the transformer is called primary voltage.
potential transformer is to maser and protection purpose the ivt is used for synchronicing purpose
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.
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 of a transformer is connected to the supply, while the secondary winding is connected to the load.
You will have a 1:1 ratio isolation transformer.
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.
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.