ABB RVC Installation And Operating Instructions Manual page 19

2. C/k
The programmed C/k value is displayed.
The recommended setting of C/k can be calculated by the following formula or can be read
directly in the table here after.
Three-phase network:
Q: reactive 3-phase power of one step
(kvar)
U: system voltage (V)
k: current transformer ratio
CT Ratio k
10/1 50/5 10
20/1 100/5 20
30/1 150/5 30
40/1 200/5 40
60/1 300/5 60
80/1 400/5 80
100/1 500/5 100
120/1 600/5 120
160/1 800/5 160
200/1 1000/5 200
300/1 1500/5 300
400/1 2000/5 400
600/1 3000/5 600
C/k table for a 3-phase / 400V system.
Capacitor step rating (kvar)
5 10 15 20
.45 .90
.23 .45 .68 .90
.15 .30 .45 .60
.11 .23 .34 .45
.07 .15 .23 .30
.056 .11 .17 .23
.09 .14 .18
.07 .11 .15
.056 .08 .11
.067 .09
.060 .09
Single phase network:
Q: reactive power of one step (kvar)
U: system voltage (V)
k: current transformer ratio
30 40 50 60
.90
.68 .90
.45 .60 .75 .90
.34 .45 .56 .68
.27 .36 .45 .54
.23 .30 .38 .45
.17 .23 .28 .34
.13 .18 .23 .27
.12 .15 .18
.067 .09 .11 .14
.06 .07 .09
20
70 90 100 1 2 0
.79 .90
.63 .81 .90
.53 .68 .75 . 9 0
.40 .50 .56 . 6 8
.31 .40 .45 . 5 4
.21 .27 .30 . 3 6
.16 .20 .23 . 2 7
.11 .14 .15 . 1 8