Question
Download Solution PDFNo load current of a transformer has
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFConcept:
Transformer on no-load:
Circuit diagram for a transformer on load:
Where,
V1 is the applied primary voltage
IW is the working component of current through R0 (Magnetizing resistance)
Iμ is the magnetizing component of current through X0 (magnetizing reactance)
N1 and N2 are the primary and secondary turns ratio
- In the case of no load, the secondary terminal of the transformer is open.
- There is no path available for the current to flow on the secondary side.
- Hence, the transformer does not draw current from the source.
- A small ampere of current flows through the primary transformer (no-load current I0) called excitation current (used for excitation of the core).
- No-load current (I0) is further divided into Iμ and IW
Phasor Diagram when transformer on no load:
Where,
E1 is the primary induced EMF
V1 is the primary terminal voltage
E2 is the secondary induced EMF
Power factor cos ϕ0 = (Iμ / I0) ≈ 0.2 to 0.25
Explanation:
No load current = 2 A
As the magnetizing component of current is very higher.
From the options, the magnetizing component may be 1.8 A
Last updated on Jun 24, 2025
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