CET Inc.
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K-Factor is defined as the weighted sum of the harmonic load currents according to their effects on
transformer heating, as derived from ANSI/IEEE C57.110. A K-Factor of 1.0 indicates a linear load (no
harmonics). The higher the K-Factor, the greater the harmonic heating effects.
)(
)(
K
2
hh
1h
2
hh
1h
max
max
h
h
I
hI
Factor
where
I
h
= h
th
Harmonic Current in RMS
h
max
= Highest harmonic order
4.3.2.4 Crest Factor
Crest Factor is defined as the Peak to Average Ratio (PAR), and its calculation is illustrated below:
where
|X|
peak
= Peak amplitude of the waveform
X
rms
= RMS value
The following table illustrates the available Voltage and Current Harmonic measurements on the PMC-
340.
Table 4-6 Harmonic Measurements
4.3.3 Unbalance
The PMC-340 provides Voltage and Current Unbalance measurements. The calculation method of
Voltage and Current Unbalance are listed below:
Voltage Unbalance =
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