Why no-load primary current is very small
as compared to full load current in transformer (as 1% of
full load current?
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Answer / jonathan r. lambert
Normally, when power is applied to a transformer the
resulting primary current will be the vector sum of the
primary impedance and the reflected (turns ratio squared)
secondary impedance. However, since the secondary impedance
is infinite at no-load the reflected secondary impedance
will not influence the primary current and the primary
current will be the result of only the primary circuit
impedance. This no-load primary current is referred to as
the primary magnetization current and represents the
current used to excite the transformer's magnetic field
that links the primary and secondary windings - typically
1% to 5% of the full rated load current. Applying a load to
the transformer secondary will result in a primary current
with two components, the reflected secondary current and
the primary magnetization current.
| Is This Answer Correct ? | 34 Yes | 11 No |
Answer / gunasekaran
no load current is used only for energising the core so it
is 1-2% of full load current
| Is This Answer Correct ? | 11 Yes | 1 No |
Answer / san
no load current is only d 3-5%of full load current.if
alternating current is applid to d primary then no load
current wl flow through only primary circuit since
secondary is open circuitd.whn load is connected to the
secondary then current wl flow through the secondary
aswell..thats y we cn conclude that no load is smaller than
full load currents..
| Is This Answer Correct ? | 10 Yes | 5 No |
when secondary is open circuit the current in primary
is low i.e only magnetizing is present to create flux
in core.but when load is connected in secondary side it
produces its own ampere turn N2I2 which reduces the flux
in core . in order to maintain the flux constant, primary current increases to balance N2I2 i.e
N1I1=N2I2(neglecting magnetizing current)
therefore primary current increases when load
is connected.
| Is This Answer Correct ? | 3 Yes | 3 No |
Answer / azam
No load pr-current of a transformer is only 1-3% of FL
current because when supply applied 2 t/f it produce
alternating flux which induces emfs in primary & sec wdgs
with in the fraction of second. where as in the case of motor
starting current drawn by it is very high due 2 no presence
of back emf
| Is This Answer Correct ? | 3 Yes | 6 No |
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