which is demonstrated in Figs. 6 and 7 where the peak flux measured
is roughly the same during application on the two different
windings. However, the magnetizing current measured during
each application is far different as is also depicted in these figures,
a result of the different number of turns between the two
sets of windings.
Since the magnetizing current decreases as the voltage rating
of the winding increases, the efficiency of the fluxing device is
greatest when applied to the highest rated winding, which is evident
by comparing the residual flux level achieved in Figs. 6 and
7.With the prefluxing device applied to the primary winding, the
transformer was fluxed to a slightly higher residual flux level
than it was with the device applied to the tertiary winding. In
addition, the component ratings of the prefluxing device are reduced,
which lowers the device cost.
A final important detail regarding the prefluxing operation on
the primary winding is that the voltage used (12.5 V) was less
than half of the voltage used on the tertiary winding (30 V) and
resulted in improved fluxing, even though the voltage rating of
the primary winding and the volt-seconds required for fluxing
are almost ten times that of the tertiary. Even though the initial
capacitor voltage is a fraction of the primary winding voltage,
the increased volt-seconds required by the winding are provided
by the increased resonant period experienced when fluxing the
transformer on this winding. Fig. 8 shows the emf waveforms
measured during the device application on the tertiary and primary
windings.
It is clearly evident how much longer the fluxing operation
takes when applied to the primary winding; the increased area
under the emfwaveform accounts for the increased volt-seconds
required by the primary winding.
The increased resonant period results from the increased
magnetizing inductance seen by the prefluxing device when
which is demonstrated in Figs. 6 and 7 where the peak flux measured
is roughly the same during application on the two different
windings. However, the magnetizing current measured during
each application is far different as is also depicted in these figures,
a result of the different number of turns between the two
sets of windings.
Since the magnetizing current decreases as the voltage rating
of the winding increases, the efficiency of the fluxing device is
greatest when applied to the highest rated winding, which is evident
by comparing the residual flux level achieved in Figs. 6 and
7.With the prefluxing device applied to the primary winding, the
transformer was fluxed to a slightly higher residual flux level
than it was with the device applied to the tertiary winding. In
addition, the component ratings of the prefluxing device are reduced,
which lowers the device cost.
A final important detail regarding the prefluxing operation on
the primary winding is that the voltage used (12.5 V) was less
than half of the voltage used on the tertiary winding (30 V) and
resulted in improved fluxing, even though the voltage rating of
the primary winding and the volt-seconds required for fluxing
are almost ten times that of the tertiary. Even though the initial
capacitor voltage is a fraction of the primary winding voltage,
the increased volt-seconds required by the winding are provided
by the increased resonant period experienced when fluxing the
transformer on this winding. Fig. 8 shows the emf waveforms
measured during the device application on the tertiary and primary
windings.
It is clearly evident how much longer the fluxing operation
takes when applied to the primary winding; the increased area
under the emfwaveform accounts for the increased volt-seconds
required by the primary winding.
The increased resonant period results from the increased
magnetizing inductance seen by the prefluxing device when
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