The programmable operating curve allows the user to freely program the timing behaviour of the
protection stage with current or time points, either with step or two-point interpolated time calculation.
When the modelled curve formula is known, it is advisable to use the curve parameters to achieve
maximum accuracy.
Events and registers
The events triggered by the function are recorded with a time stamp and with process data values.
The function registers its operation into the last twelve (12) time-stamped registers; this information is
available for all provided instances separately. The register of the function records the ON event
process data for START, TRIP or BLOCKED. The table below presents the structure of the function's
register content.
Table. 5.3.2.1 - 53. Register content.
Date and
time
Event code
Fault type
Trigger
current
Fault
current
Pre-fault
current
Trip time
remaining
Used SG
dd.mm.yyyy
hh:mm:ss.mss 12736-12805 Descr. L1-E…L1-L2-L3
Start
average
current
Trip -20
ms
averages
Start -200
ms
averages
0…1800 s
Setting
group 1...8
active
5.3.2.2 Capacitor bank current unbalance protection (Iuc>; 46C)
The capacitor bank current unbalance protection is used in protecting the capacitor bank with a double
wye configuration. The operating decisions are based on phase current magnitudes which the function
constantly measures. The monitored phase current magnitudes are equal to RMS values. The blocking
signal and the setting group selection control the operating characteristics of the function during
normal operation, i.e. the user or user-defined logic can change function parameters while the function
is running.
A
AQ
Q-C213
-C213
Instruction manual
Version: 2.04
102