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# Transformer riddle No.45 – Transformer Magnetizing Current

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Topic
• #533
Hamid

Which side of a loaded transformer contains the magnetizing current?
Which side of a loaded transformer contains the magnetizing current?
1- One side which connected to power supply (primary)?
2- One side which connected to load (secondary)?
3- What about window type measuring current transformers (current transformer with one turn winding in primary side)?
4-What about transmission power transformer in power network which the direction of power flow is variable in it , dose the magnetizing current flow in one side of transformer? which side?

Viewing 8 replies - 1 through 8 (of 8 total)
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• #2018
amir khashayar

1)In power transformer it is absorbed from primary winding . 2)In current transformer it is absorbed from secondary winding . 3)In principle , magnetizing currenr is presented in one winding only . It causes magnetizing flux flows in core and leads to the phenomenon of coupling between two windings . 4)In power transformers to be energized from both sides , the magnetizing current is presented in both windings.

#2020
Hamid

Why? Please more explain 1-Why?, is it dependent to load power factor ( leading or lagging)? 2- Why?, is it dependent to load power factor ( leading or lagging)? 3- N1.I1+N2.I2 = (N1 or N2). Imag >0 , N1 or N2 which one? 4- Is the direction of active power flow important or reactive power flow?

#2022
amir khashayar

In power transformers installed in power network , in any case one side is considered generation side , and the other side despite connecting with an active element is considered load . Now , if due to conditions of network the generation winding is going to be changed into consuming winding , for a very short time the magnetizing current is absorbed from both sides. Little by little , the portion of one side approaches to zero and all magnetizing current is absorbed from generation side.

#2024
Hamid

Why is the direction of active power flow important? Why the direction of reactive power flow is not important in this regard? As you know the direction of reactive and active power flow can be opposite simultaneously in interconnection media (power transformer) of a power system.

#2027
amir khashayar

No load current of transformer is composed of two perpendicular components . Iw which covers iron loss and Im which is in fact magnetizing current . If as a simplifying assumption we dispense from Iw . then Im is absorbed from reactive generating winding

#2030
Hamid