Fault Recorder Fltrfrc (Ansi Fr); Function Block; Functionality - ABB RELION REX640 Technical Manual

Protection and control

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Basic functions

Fault recorder FLTRFRC (ANSI FR)

Figure 55: Function block

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.

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,

duration always shows values less than 100%.

The fault recorded data

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.

Protection (rec. set 1 or rec. set 2) and Start duration are

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

1MRS759142 F

Technical Manual