51
Figure 52 General settings menu
8.5.3.1 Capacitor stages menu
Cyclic switching
·
ON / OFF (ON is recommended). The purpose of cyclic switching
is to ensure that all capacitor stages of the same power rating are
switched in equally frequently.
Discharge time
·
5 - 900 s (1 s increments) capacitor stage discharge time.
The discharge time must be at least as long as the longest
discharge time of the capacitors in use.
Fixed stages
·
Capacitor stages permanently switched in, not under PQC control.
Choke factor (detuning)
·
Choke of the power factor correction system. (A value must be set
for correct computation. If the system is not detuned, 0% must be
entered).
Zero stage (dud) limit
·
Set limit for classifying a capacitor stage as zero. It is that percen-
tage of the most recently calibrated corrective power below which
the stage is excluded from the power factor control process.
Example: Zero stage limit set at 85%
At initial start-up (calibration), the corrective power of stage 1 was
determined as 50 kvar. Later, a capacitor of stage 1 becomes
defective, so that 12.5 kvar are now lacking, and the stage has a
corrective power of only 37.5 kvar.
This corresponds to a stage power loss of:
The residual corrective power of the stage as a percentage of its
power on start-up is thus:
Result: The alarm is given, since the residual corrective power as a
percentage is less than the set limit of 85%.
Nominal voltage
·
The supply voltage
Key
Action
Back to General
Select
parameter
Select
parameter
Edit parameter
–
residual corrective power in % = 1 - power loss = 75%
power loss =
(
1- 37.5 kvar
)
· 100 = 25%
50 kvar
