Figure. 5.4.8. - 45. Restricted earth fault on inside of Y winding transformer.
Events and registers
The REF function generates events and registers from the status changes of the Trip activated and
blocked signals. To main event buffer it is possible to select status “On” or “Off” messages.
12 last registers are available in the function where the triggering event of the function (Trip activated or
blocked) is recorded with time stamp and process data values.
Table. 5.4.8. - 96. Event codes of the REF function instance
Event Number
Event channel
Event block name
Event Code
Description
4224
66
REF1
0
REF Trip On
4225
66
REF1
1
REF Trip Off
4226
66
REF1
2
REF Block On
4227
66
REF1
3
REF Block Off
In the register of the REF function is recorded activated, blocked etc. “On” event process data. The
structure of REF function register content is presented in the table below. This information is available
in 12 last recorded events for all provided instances separately.
Table. 5.4.8. - 97. Register content
Date & Time
Event code
Trigger currents
Trigger currents
Residual
currents
Used
SG
dd.mm.yyyy
hh:mm:ss.mss
4224-4227
Descr.
Biascurrent trig
Diffcurrent trig
Characteristics diff
trig
Biascurrent max
Diffcurrent max
Characteristics diff
max
I0Calc
I0 meas
1 - 8
AQ-T257
Instruction manual
Version: 2.00
95
© Arcteq Relays Ltd