CIRCUTOR CVMk2 Series - Manual (Page 147)

147
CVM k2
CHARACTERISTICS
10.3.4. K FACTOR
The K Factor is considered to be a transformer power reduction factor.
Losses generated by the harmonics are taken into consideration to calculate the K factor.
The unit is always higher to the unit in facilities with non-linear loads.
The measurement is taken via a parameter known as perceptibility (P).
- For short time frames (10 minutes) it is defined as P
st
.
- For long time frames (10 minutes) it is defined as P
it
.
A flicker is considered to be perceivable if P
st
> 1 and P L
t
> 0,8
e: represents the ratio of copper losses and iron losses of the transformer. This value can
be obtained from the test data of the transformer or else may be the approximate value
of 0.3.
q: exponent value between 1.7 or 1.8.
10.3.5. CREST FACTOR
The Crest Factor is equal to the peak amplitude of the waveform divided by RMS value. The
purpose of calculating the crest factor is to give the analyst a quick idea that such an impact is
occurring in the waveform. The impact is continually associated with the roller bearing, wear,
cavitation and wear of teeth gear, etc.