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A transformer's 'no load' current is not 'high'. On the contrary, it is zero!
'No load' means that there is nothing connected to the secondary (output) of the transformer -i.e. it is an open circuit. So a transformer's secondary 'no load' current is zero! The primary current still has to provide a magnetising current, but that current will be very small.
Don't forget, a 'light load' means little current is drawn, so the load must have a high resistance; a 'heavy load' means lots of current is drawn, so the load must have a low resistance.
Wiki User
∙ 12y ago
Wiki User
∙ 12y agothere is current flow in the primary winding only not in secondary winding, primary current due to the energization of the core. it is considerably less.
AnswerWhen we describe a transformer having a 'no-load current', we are describing the current flowing in the primary winding when the secondary winding is open circuited and, therefore, not supplying a secondary current.
The primary 'no-load current' (Io) is determined by dividing the primary supply voltage by the impedance of the primary winding. This impedance is made up of a resistance that is very small in comparison to its inductive reactance and, therefore, the no-load current lags the supply voltage by very nearly 90 degrees. This current can be resolved into a magnetising current (Im), which lags the supply voltage by 90 degrees and is responsible for setting up the magnetic flux in the core, and a current (Ii) which is in phase with the supply voltage, and supplies the losses in the transformer.
Wiki User
∙ 14y agoNo loaded condition the current on the primary side provides only core or iron loss.
there is no current at the secondary winding.
Wiki User
∙ 11y agoThe no load current of a transformer is mostly due to eddy current losses in the iron core.
Wiki User
∙ 11y agoMostly eddy currents in the transformer core.
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What is zero current transformer?
It is a transformer with No load attach to it.
What is the percentage of the no-load current in a transformer to its full load current?
2 to 5% of full load current
Function of no-load in transformer in a open-circuit?
To calculate the no load current from transformer & core loss is also calculated.
What happens if transformer wattage is much less than load wattage?
If the load current is too high, the power lost in the transformer windings will be too high and it will overheat. If the voltage is excessive, the power lost in eddy currents in the magnetic core will be too high and it will overheat.
What will happen when we change value of load resistance in transformer?
When the value of the load resistance in a transformer is changed, it will affect the current flowing through the circuit. Increasing the load resistance will decrease the current, while decreasing the load resistance will increase the current. This change in current will in turn affect the voltage across the load and the efficiency of the transformer.
The current load of a transformer is the current drawn by the?
load
What is zero current transformer?
It is a transformer with No load attach to it.
What is the percentage of the no-load current in a transformer to its full load current?
2 to 5% of full load current
Why no load current in transformer small?
No load current is energizing current. This is effectively "lost" power, power used in the transformer to energize the core. It, therefore, should be small!
What is full load magnetising current of transformer?
is it primary current ?
Function of no-load in transformer in a open-circuit?
To calculate the no load current from transformer & core loss is also calculated.
How is no load current reduced?
No load current, in a transformer for example, is the current necessary for exciting the transformer. If you wish to keep it energized, and you need to keep it energized at full voltage, there is nothing you can do to reduce this other than replace the transformer with one that has lower no load current. If you are referring to a different piece of equipment, you may need to specify what you are meaning by "no load current".
What is the function of the primary current when the secondary winding of the transformer is open?
When the secondary of a transformer is opened, there is no longer any load on the transformer. There will be some current flowing in the primary winding, which is needed to induce the voltage in the secondary. This primary current is referred to as the "no load" current, and is indicative of the core losses in the transformer.
What happens if transformer wattage is much less than load wattage?
If the load current is too high, the power lost in the transformer windings will be too high and it will overheat. If the voltage is excessive, the power lost in eddy currents in the magnetic core will be too high and it will overheat.
What will happen when we change value of load resistance in transformer?
When the value of the load resistance in a transformer is changed, it will affect the current flowing through the circuit. Increasing the load resistance will decrease the current, while decreasing the load resistance will increase the current. This change in current will in turn affect the voltage across the load and the efficiency of the transformer.
What is the no load current of 1600 kva transformer?
No load current depends on the design of the transformer, and what voltage it is energized at. It will typically be below 1% of full load, and can be significantly below 1% for utility sized transformers.
What is the secondary rating of a 50KVA transformer?
The secondary current is determined by the load, not by the transformer. For example, if the secondary voltage is 50 V and the load is 100 ohms, then the secondary current will be 0.5 A. If the load is 25 ohms, then the secondary current will be 2 A. It is important that a continuous secondary current doesn't exceed the rated secondary current of the transformer.
