ABB RELION REX640, Техническое руководство, Страница: 144 / 1960

3.9 Fault recorder FLTRFRC (ANSI FR)
3.9.1 Function block
Figure 55: Function block
3.9.2 Functionality
The protection relay has the capacity to store the records of the latest 128 fault
events. Fault records include fundamental or RMS current values. The records enable
the user to analyze recent power system events. Each fault record (FLTRFRC) is
marked with an up-counting fault number and a time stamp that is taken from the
beginning of the fault.
The fault recording period begins from the start event of any protection function
connected to the
START
input and ends if any protection function connected to the
OPERATE
input trips or the start is restored before the operate event. If a start is
restored without an operate event, the start duration shows the protection function
that has started first. The
TRIG
input can be used to start the fault recording period
with, for example, binary input.
If
Start duration has the value "100%", it indicates that a protection function has
operated during the fault; if none of the protection functions has operated,
Start
duration always shows values less than 100%.
The fault recorded data
Protection (rec. set 1 or rec. set 2) and Start duration are
from the same protection function. The fault recorded data operate time shows
the time of the actual fault period. This value is the time difference between the
activation of the internal start and operate signals. The actual operate time also
includes the starting time and the delay of the output relay. The fault recorded data
Breaker clear time is the time difference between the internal operate signal and the
activation of the
CB_CLRD
input.
If some functions in the relay application are sensitive to start frequently,
it might be advisable to set the setting parameter Trig mode to "From
operate". Then only faults that cause an operate event trigger a new fault
recording.
Basic functions 1MRS759142 F
144 REX640
Technical Manual