Either circuit is adequate for explaining the effects of PF within a dielectric specimen. In the series
circuit, R
S
represent the series AC resistance. The parallel circuit shows R
p
as the equivalent
parallel resistance. Though both can be used in discussing and defining PF, the parallel circuit is
the most common. In both cases, the resistance represents the presence of moisture,
contaminants, lossy partial discharge (PD) activity, and inherent polar materials.
Have a look in the attachment “F.5 Show Series Values” on page 106 if you would like to see the
series values.
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