CIRCUTOR CVMk2 Series - Manual (Page 146)

146
CVM k2
CHARACTERISTICS
10.3. OTHER CONCEPTS
10.3.1 UNBALANCE COEFFICIENT (KD)
The unbalance coefficient (Kd) is the ratio between the amplitude of the components in the
direct and inverse sequence.
10.3.1 ASYMMETRY COEFFICIENT (KA)
The asymmetry coefficient (Ka) is the ratio between the amplitude of the components in the
direct and homopolar sequence. The components of the homopolar sequence are zero if there
is not a neutral.
10.3.3 FLICKER
Flicker is considered to be the low frequency disturbances or variations in amplitude of the
voltage between 0.5 and 25 Hz. (f<2,500Hz). Human eye is sensible to modulated frequency
of 8...10 Hz with 0,3 or 0,4% magnitude voltage variations.
The CVMk2 applies the symmetric components method conceived by Fortescue and Stokvis
to make network quality calculations.
This method makes a vector comparison of phasors, taking the phase difference and the
module into consideration. It is used for voltage and current alike.
To indicate the degree of imbalance in a system, two coefficients are used.