P746/EN ST/G31 Settings
(ST) 4-
8
MiCOM P746
ST
Setting Range
Menu Text Default Setting
Min. Max.
Step Size
tDIFF 0.000 s 0.000 s 10.00 s 10.00 ms
Sets the time delay up to 10 seconds
CheckZone Status Enabled Disabled / Enabled
To enable (activate) or disable (turn off)
IDCZ>2 Current 2.400 kA 50.0 A 30 kA 10.0 A
Setting that determines the minimum differential operating current for the Check Zone
biased differential element.
Phase Slope kCZ 30.00 % 0.000 % 90.00 % 1.00 %
Slope angle setting for the check zone biased differential element.
Circuitry fail Enabled Disabled / Enabled
To enable (activate) or disable (turn off) the circuitry fail protection. If the function is
activated, the following options are accessible.
ID>1 Current 200 A 50.0 A 5 kA 10.0 A
Setting for the phase circuitry fault monitoring characteristic for the minimum pickup.
Phase Slope k1 10.00 % 0.000 % 50.00 % 1.000 %
Slope angle setting for the phase circuitry fault monitoring characteristic.
ID>1 Alarm timer 5.000 s 0.000 s 600.0 s 10.00 ms
Setting for the operating time delay of the phase circuitry fault monitoring
CZ CCTFAIL MODE AlarmSR&No Block Alarm & No Block / AlarmSR&No Block /
Blocking Latched / Alarm Latched / Sel-
Reset
Options for the Check Zone differential element faulty calculation due to wrong position of
CB or isolator or CT failure are as follow:
– AlarmSR&No Block: The CZ does not block any zone trip and the alarm disappears as
soon as the CZ calculation is right.
– Alarm & No Block: The CZ does not block any zone trip and the alarm disappears only
after manual reset.
– Self-Reset: The CZ blocks any zone trip and both the blocking and the alarm
disappear as soon as the CZ calculation is right.
– Alarm Latched: The CZ blocks any zone trip, the blocking disappears as soon as the
CZ calculation is right but the alarm disappears only after manual reset.
– Blocking Latched: The CZ blocks any zone trip and both the blocking and the alarm
disappear only after manual reset.
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