K factor, Crest factor – CIRCUTOR CVMk2 Series User Manual

Page 147

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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.

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