ABB RVC Instructions D'installation Et D'utilisation page 8

R VC M A N U A L E N G L I S H
8
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 j
An alternative target cos j is activated when power flow is reversed (P
< 0).
- 0.7 ≤ cos j ≤ - 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. Recom-
mended values: 0.9 Vnom < Vmin ; Vmax < 1.1 Vnom.
If the system voltage exceeds Vmax limit or is under Vmin limit, all
steps are disconnected one by one. In case of undervoltage, the dis-
connection is faster (< 1 network period).
When decreasing the specified voltage level continuously, the protec-
tion can be disabled. This condition is shown by a " " display on the
screen.