Hioki 3196 - Page 217

12.4 Formulae
211
Short interval voltage flicker Pst
Single-phase 2-wire
1P2W
Single-phase
3-wire
1P3W
Three-phase
3-wire
3P3W2M
Three-phase
3-wire
3P3W3M
Three-phase
4-wire
3P4W
Pst1 Pst1
Pst2
Pst1
Pst2
Pst1
Pst2
Pst3
Pst1
Pst2
Pst3
• Indicates the following values: K1=0.0314, K2=0.0525, K3=0.0657, K4=0.28, K5=0.08.
• The cumulative probability function (CPF) is in the 1024 class.
• Searches using linear interpolation between the various cumulative probabilities (Pi) and calculates a
smoothed cumulative probability using the following methods (Pis).
• P1s=(P0.7+P1+P1.5)/3
• P3s=(P2.2+P3+P4)/3
• P10s=(P6+P8+P10+P13+P17)/5
• P50s=(P30+P50+P80)/3
c: measured channel
Pstc K1P0.1 K2P1s K3P3s K4P10s K5P50s+++ +=
Long interval voltage flicker Plt
Single-phase 2-wire
1P2W
Single-phase 3-wire
1P3W
Three-phase 3-wire
3P3W2M
Three-phase 3-wire
3P3W3M
Three-phase 4-wire
3P4W
Plt1 Plt1
Plt2
Plt1
Plt2
Plt1
Plt2
Plt3
Plt1
Plt2
Plt3
• N indicates the number of measurements (N = 12 measurements).
(When N<12, the number of measurements N is used.)
c: measured channel
Pltc
Pstn()
3
n1=
N
∑
N
----------------------
3
=