Fault Recorder Fltrfrc; Function Block; Functionality - ABB RELION 620 Series Technical Manual

Protection and control

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Basic functions

Fault recorder FLTRFRC

Figure 32: Function block

The protection relay has the capacity to store the records of 128 latest 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

and ends if any protection function 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.

Start duration that has the value of 100% indicates that a protection function

has operated during the fault and if none of the protection functions has been

operated, Start duration shows always values less than 100%.

The Fault recorded data Protection and Start duration is 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

difference between internal operate signal and activation of CB_CLRD input.

The fault-related current, voltage, frequency, angle values, shot pointer and the

active setting group number are taken from the moment of the operate event, or

from the beginning of the fault if only a start event occurs during the fault. The

maximum current value collects the maximum fault currents during the fault. In case

If some functions in relay application are sensitive to start frequently

it might be advisable to set the setting parameter

operate". Then only faults that cause an operate event trigger a new fault

1MRS757644 H

Logical device LD0 block sta-

Logical device LD0 test sta-

Breaker clear time is the time

Trig mode to "From

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