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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.
Q: reactive 3-phase power of one step
(kvar)
U: system voltage (V)
k: current transformer ratio
CT Ratio k Capacitor step rating (kvar)
5 101520304050607090100120
10/1 50/5 10 .45 .90
20/1 100/5 20 .23 .45 .68 .90
30/1 150/5 30 .15 .30 .45 .60 .90
40/1 200/5 40 .11 .23 .34 .45 .68 .90
60/1 300/5 60 .07 .15 .23 .30 .45 .60 .75 .90
80/1 400/5 80 .056 .11 .17 .23 .34 .45 .56 .68 .79 .90
100/1 500/5 100 .09 .14 .18 .27 .36 .45 .54 .63 .81 .90
120/1 600/5 120 .07 .11 .15 .23 .30 .38 .45 .53 .68 .75 . 9 0
160/1 800/5 160 .056 .08 .11 .17 .23 .28 .34 .40 .50 .56 . 6 8
200/1 1000/5 200 .067 .09 .13 .18 .23 .27 .31 .40 .45 . 5 4
300/1 1500/5 300 .060 .09 .12 .15 .18 .21 .27 .30 . 3 6
400/1 2000/5 400 .067 .09 .11 .14 .16 .20 .23 . 2 7
600/1 3000/5 600 .06 .07 .09 .11 .14 .15 . 1 8
C/k table for a 3-phase / 400V system.
Three-phase network: Single phase network:
Q: reactive power of one step (kvar)
U: system voltage (V)
k: current transformer ratio
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