M-LIB3 Low Impedance Bus Differential Relay
30
6.14 READING OF PROGRAMMED SETTINGS AND RELAY'S CONFIGURATION
Enter the mode "SET DISP", select the menu "SETTINGS" or "F

→

RELAY", scroll information available in the
menu by keys "+" or "-".
SETTINGS= values of relay's operation parameters as programmed
F

→

RELAY= output relays associated to the different functions as programmed.
6.15 PROGRAMMING
The relay is supplied with the standard default programming used for factory test. [ Values here below reported
( ----- ) ].
All parameters can be modified as needed in the mode PROG and displayed in the mode SET DISP
Programming is enabled only if no input current is detected (main circuit breakers open).
As soon as programming is enabled, the LED PRG/IRF flashes and the reclosing lockout relay R5 is de-
energized. Enter MODE "PROG" and SELECT either "SETTINGS" for programming of parameters or
"F→RELAY" for programming of output relays configuration; enable programming by the indirect operation key
PROG.
The key SELECT now scrolls the available parameters. By the key (+) , (-) the displayed values can be
modified; to speed up parameter's variation press the key SELECT while "+" or "-" are pressed.
Press key "ENTER/RESET" to validate the set values.

6.15.1 PROGRAMMING OF FUNCTIONS SETTINGS

Mode PROG menu SETTINGS. (Production standard settings here under shown).
Display Description Setting Range Step Units
xxxxxxx Current date DDMMMYY - -
xx:xx:xx Current time HH:MM:SS - -
Fn 50 Hz System frequency 50 - 60 10 Hz
Ids 0.2 In Basic minimum pick-up level of differential element 0.2 – 2 – Dis 0.01 In
trf 1 s Trip time delay of the Relay’s Internal Fault Detector 0.1 – 9.9 0.1 s
BI OFF Blocking Input enable OFF – ON - -
1R 0.5 pu Bias coefficient in the zone [1IR] <IR < [2IR]0.4 – 1 0.01 pu
1IR 1 In Action starting level for 1R 0.5 – 2.0 0.1 In
2R 1.0 pu Bias coefficient in the zone IR > [2IR]0.4 – 1.00 0.01 pu
2IR 6 In Action starting level for 2R 3 – 8 0.1 In
Isv 0.2 In Minimum pick-up level of CT supervision element 0.1 – 1 - Dis 0.01 In
tsv 1 sTime delay of the C.T Supervision element 0.1 – 9.9 0.1 s
TRG: Ext Trigger for oscillography records is Internal or External
(via digital input B3) Ext - Ids
Is – Isv - -
Tsyn Dis m Synchronization time internal 5-10-15
30-60-Dis - -
NodAd 1Identification number for connection on serial
communication bus 1 - 250 1-
The setting Dis indicates that the function is disabled.
In 500 Ap
In
is the unit of
measure,
0.2
is the
setting
default
Ids
is the
name
of the variable