C/K; Delay; Steps; Protection - ABB RVC Installation And Operating Instructions Manual

C/k

It is the sensitivity of the controller which is set to about 2/3 of the
current of the smallest switched step. C/k is related to the power of
smallest step (Q in kvar), V (nominal voltage in V), k (CT ratio).
0.01 c/k 3.00 (refer to # 9. C/k table for a 3-phase / 400V
system, or use formula given in # 9. for other cases).

DELAY

1 sec switching delay 999 sec. Default setting is 40 seconds.

STEPS

There are max. 12 outputs, each can be set from 0 (disabled), 1...9,
or F (fixed).
'1' represents the smallest switched step (refer to c/k ratio). A typical
sequence could be 1:1:2:4... for a 200 kvar bank with 25 kvar as
smallest (represented by '1') and 100 kvar as biggest ('4') steps.
'0' means that the output is never connected.
'F' means that the output is always connected unless a protection
event arises.
FEATURE 1: Linear / circular (refer to # 8.)
Linear: last in first out Circular: first in first out
FEATURE 2: Generative / regenerative target cos ϕ ϕ
An alternative target cos ϕ is activated when power flow is reversed
(P < 0).
- 0.7 cos phi - 1.0.
The negative sign indicates regenerative mode.
Protection 1 & 2: Overvoltage (Max Vrms)/undervoltage (Min Vrms)
User settable parameter for protection of capacitor bank.
Recommended values: 0.9 Vnom < Vmin ; Vmax < 1.1 Vnom.
If the system voltage exceeds this limit, all steps are disconnected
one by one. In case of undervoltage, the disconnection is faster (< 1
network period).
Below certain specified voltage, these protections are disabled. This
condition is shown by a " " display on the screen.
8