Siemens 9410RC - Voltage Crest Factor; Crest Factor Current; K-Factor

9410 series Power quality
2. Press the more button, and select the desired harmonics. The per-phase
harmonics are graphically displayed.
3. Press the left and right buttons to move to individual harmonics. The harmonic
number, magnitude and angle are displayed.
Related Topics
• Data viewing using your meter’s display
Voltage crest factor
Crest factor is the ratio of peak to RMS voltage values.
For a pure sinusoidal waveform, crest factor is equal to 1.414. The meter uses the
following equation to calculate crest factor:
C =
V
peak
V
RMS
C = Crest factor
V
peak
= Voltage peak
V
RMS
= Voltage RMS
Crest factor current
Crest factor is the ratio of peak to RMS current values.
For a pure sinusoidal waveform, crest factor is equal to 1.414. The meter uses the
following equation to calculate crest factor:
Crest factor
I
pe a k
I
RMS
= -------------
C = Crest factor
I
peak
= Current peak
I
RMS
= Current RMS
K-factor
K-factor relates the heating effect of a distorted current in a transformer to a sinusoidal
current with the same RMS magnitude — it describes a transformer’s ability to serve
non-linear loads without exceeding rated temperature rise limits.
The K-factor is equal to the sum of the squares of the harmonic currents multiplied by
the squares of the harmonic order. The meter uses the following equation to calculate
K-factor:
K =
h
(Ih x h )
2 2
n = 1
h
Ih
2
n = 1
∑
∑
Where K is the K-factor, h is the harmonic order and Ih is the true RMS current of
harmonic order h.
150 7EN05-0336-01