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is it primary current ?
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What is the percentage of the no-load current in a transformer to its full load current?
2 to 5% of full load current
What in a transformer determines whether it increases or reduces current?
The ratio of the primary winding turns to the secondary winding turns. This governs voltage which is directly related to the current and load.AnswerA transformer increases or decreases voltage, notcurrent. The secondary current is determined by the load, and the secondary current determines the primary current. If there is no load, then there is no secondary current, and the primary current is mainly made up of the magnetising current.
Sketch and explain the no load phasor diagram of a transfomer?
a.) Io = no load current consists of 5% of the full-load primary current. b.) Iom = magnetising current/component responsible for setting up the magnetising flux in the core. c.) Iol = Ic = power loss component responsible for supplying the core losses and the windings losses.
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.
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 role of magnetizing current in transformer?
connect 3 - phase supply to transformer primary winding.....keep transformer secondary winding open..... apply 3-phase voltage i.e.400v ac, and measure the amount of current flowing in each phase of the transformer primary winding...this current is the transformer magnetising current..... we can keep multimeters in series with the source....so we can measure directly the current readings.....(keep multimeters in current mode, and generally magnetising current will come in terms of milli amps for 400 v )
Why no load current in a transformer is high?
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.
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.
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 meant by rated voltage rated current and rated power of a transformer?
The ratings state the limits on voltage and current for operating the transformer at full load. The rated voltage times the rated current gives the rated VA of the transformer. Transormers are not usually rated directly for power because this depends on the power factor of the load applied.
What is no load current in a transformer?
A transformer's 'no-load current' is the primary current flowing, when the secondary winding is open circuited -i.e. with no secondary current flowing. The no-load current (Io) is determined by dividing the primary supply voltage by the impedance of the primary winding. As the primary winding's inductive reactance is very much greater than its resistance, the no-load current lags the supply voltage by very nearly 90 degrees. This current can be resolved into two components, (Ii) in phase with the supply voltage, and (Im) lagging the supply voltage by exactly 90 degrees. Ii is responsible for the losses, while Im is responsible for the magnetising flux.
