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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 )
Pete Williamson
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∙ 14y agoconnect 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 )
Wiki User
∙ 14y agothere is test is done for electrical Transformers called open circuit test, you ll unload the terminals of the 2nd winding and operate the transformer , and install ameter series with the first winding. with operating the transformer the primary current will equal approximately to the magnetizing current.
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∙ 12y agoBy 'line current', I assume that you are talking about the primary current?
The primary current is dependent on the secondary load current, which you will have to determine firstly by dividing the secondary voltage by the impedance of the load. After that, you can solve for Ip, using the general equation:
Ip Np = Is Ns
Wiki User
∙ 11y agoMultiply the transformer's nominal rated secondary voltage by the secondary load current, to obtain the value of load expressed in volt amperes.
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What is the standard output current of a transformer when connected to an ac?
There is no 'standard' output current from a transformer. The secondary (output) current depends on the load, and should not exceed the rated secondary current. To find the rated secondary current, you divide the transformer's rated volt amperes by the rated secondary voltage. The above cited answer need more descriptive ; a) V/Z = I, b) V/Z = I + Magnetizing current of the transformer taken from Primary side of the transformer.
What is the difference between the inrush current and the fault current?
Magnetizing inrush current has bigger 2nd harmonics compare to short circuit current. the second harmonics content is about >60% of fundamental harmonic. magnetizing inrush current happened when we energised the transformer, and short circuit current happened if there is a short circuit between different alive phase.
In transformer if frequency are reduce then what happen?
t's basically a matter of the magnetizing inductive reactance which is inversely proportional to frequency. You want to keep the magnetizing current low to minimize power loss and avoid saturating the core. The higher the frequency, the lower the required inductance for a given inductive reactance and magnetizing current, thus the smaller the required core and/or number of turns on the windings.Magnetizing current is a normal parasitic byproduct of the transformer inductance and the applied voltage level and frequency. The amount of power that can be transferred through a transformer is usually limited by the transformer winding resistances and is unrelated to the magnetizing current. Thus core size goes up at higher power levels due to larger required wire size, not due to any core limitations.
What is meant by maganetization current?
It is the one which is used to produce flux in transformer and main field flux in motor or generator. Flux is proportional to the current passed through the coil. Flux is inversely proportional to the reluctance of the medium that the flux passes through. Flux is analogous to current. Reluctance is analogous to resistance. MMF is analogous to voltage. so if there is a coil carrying 5A current and 10 turns it produces 5*10 = 50 Ampere Turns MMF . so as the current increases MMF increases. If reluctance of the medium used is high there will be more flux. Let us take a transformer in that in order to produce EMF in the secondary we have to give flux from the primary for that we need a current in the primary that is called Magnetizing current . Any way if we load the transformer , the transformer primary carries (N2 / N1 ) * I2 current in addition to magnetizing current. Apart from these two currents there will be another current which is responsible for core loss in the transformer. Please note that all these three currents are at different phase angles i.e. they are not in same phase. Medium for the flux in the transformer is core. If it is a iron core reluctance is more , to produce same EMF it will take more magnetizing current. If we use CRGO steel as core reluctance is less. For less magnetizing current itself we get flux for the required EMF in secondary.
Why primary current is higher than secondary current in transformer with turns ratio 1?
In a transformer with a turns ratio equal to 1, the primary current comprises the reflected secondary current plus the magnetizing current necessary to sustain the "back EMF developed across the mutual inductance coupling the primary winding to the secondary. Therefore the primary current is always greater than the secondary current in a transformer with a turns ratio equal to 1. This should be evident by applying Kirchhoff's Current Law to the central node of the "T-equivalent" model of a transformer.
What is mean by magnetizing current of transformer?
A: As current flow in the primary it will magnetize the core of the iron in the transformer that is called magnetizing.
What is the procedure to measure the magnetizing current in transformer?
i also do know the answer
What is the standard output current of a transformer when connected to an ac?
There is no 'standard' output current from a transformer. The secondary (output) current depends on the load, and should not exceed the rated secondary current. To find the rated secondary current, you divide the transformer's rated volt amperes by the rated secondary voltage. The above cited answer need more descriptive ; a) V/Z = I, b) V/Z = I + Magnetizing current of the transformer taken from Primary side of the transformer.
What is the difference between the inrush current and the fault current?
Magnetizing inrush current has bigger 2nd harmonics compare to short circuit current. the second harmonics content is about >60% of fundamental harmonic. magnetizing inrush current happened when we energised the transformer, and short circuit current happened if there is a short circuit between different alive phase.
In transformer if frequency are reduce then what happen?
t's basically a matter of the magnetizing inductive reactance which is inversely proportional to frequency. You want to keep the magnetizing current low to minimize power loss and avoid saturating the core. The higher the frequency, the lower the required inductance for a given inductive reactance and magnetizing current, thus the smaller the required core and/or number of turns on the windings.Magnetizing current is a normal parasitic byproduct of the transformer inductance and the applied voltage level and frequency. The amount of power that can be transferred through a transformer is usually limited by the transformer winding resistances and is unrelated to the magnetizing current. Thus core size goes up at higher power levels due to larger required wire size, not due to any core limitations.
What is meant by maganetization current?
It is the one which is used to produce flux in transformer and main field flux in motor or generator. Flux is proportional to the current passed through the coil. Flux is inversely proportional to the reluctance of the medium that the flux passes through. Flux is analogous to current. Reluctance is analogous to resistance. MMF is analogous to voltage. so if there is a coil carrying 5A current and 10 turns it produces 5*10 = 50 Ampere Turns MMF . so as the current increases MMF increases. If reluctance of the medium used is high there will be more flux. Let us take a transformer in that in order to produce EMF in the secondary we have to give flux from the primary for that we need a current in the primary that is called Magnetizing current . Any way if we load the transformer , the transformer primary carries (N2 / N1 ) * I2 current in addition to magnetizing current. Apart from these two currents there will be another current which is responsible for core loss in the transformer. Please note that all these three currents are at different phase angles i.e. they are not in same phase. Medium for the flux in the transformer is core. If it is a iron core reluctance is more , to produce same EMF it will take more magnetizing current. If we use CRGO steel as core reluctance is less. For less magnetizing current itself we get flux for the required EMF in secondary.
Why primary current is higher than secondary current in transformer with turns ratio 1?
In a transformer with a turns ratio equal to 1, the primary current comprises the reflected secondary current plus the magnetizing current necessary to sustain the "back EMF developed across the mutual inductance coupling the primary winding to the secondary. Therefore the primary current is always greater than the secondary current in a transformer with a turns ratio equal to 1. This should be evident by applying Kirchhoff's Current Law to the central node of the "T-equivalent" model of a transformer.
How is current controlled in welding transformer?
in welding machine, the transformer used is basically a current transforrmer. so by changing the tap of secondary side of transformer, we can increase or decrease the current in the transformer.
What is principle of Current transformer?
why does have to short-circuit secondary wire of current transformer ?
WHAT IS THE The phenomenon in which magnetism lags behind the magnetizing current?
This phenomenon is referred to as the hysteresisof the material.
Difference between potential transformer and current trasnformer?
The difference between current transformer and potential transformer is that the secondary of a current transformer can not be open circuited while under service whereas that of the potential transformer an be open circuited without any damage to the transformer.
What is zero current transformer?
It is a transformer with No load attach to it.
