GE P742

Settings
P74x/EN ST/N
a7
MiCOM P74
1, P742, P743
(ST) 4-
17
ST
Menu Text Default Setting
Setting Range
Step Size
Min. Max.
BUSBAR OPTION
Circuitry tReset 5.0s 0.0s 600.0s 0.1s
Setting for the reset time delay of the circuitry fault reset options
Circ. Block Mode 3phase Blocking 3phase Blocking / Blocking / phase
Options for all the Zones and Check Zone differential element faulty calculation due to
wrong position of CB or isolator or CT failure are as follow:
3phase Blocking:
If the faulty calculation occurs on one phase only, the Zone and/or Check Zone is blocked
for the 3 phases.
Blocking / phase:
If the faulty calculation occurs on one phase only, the Zone and/or Check Zone is blocked
for this phase only.
CZ PU Err.Mode Alarm & No Block AlarmSR&No Block / Alarm & No Block /
Self-Reset / Alarm Latched / Blocking
Latched
Check Zone Peripheral Unit error mode: options for the Check Zone differential element
faulty calculation due to a loss of a Peripheral Unit (PU) information are as follow:
AlarmSR&No Block (Alarm Self Reset and No blocking):
The CZ does not block any zone trip and the alarm disappears as soon as the CZ
calculation is right.
Alarm & No Block (Alarm and No blocking):
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.
Zx PU Err.Mode Blocking Latched Self-Reset / Alarm Latched / Blocking
Latched
Options for all the Zones differential element faulty calculation due to a loss of a Peripheral
Unit (PU) information are as follow:
Self-Reset:
The Zone is blocked and both the blocking and the alarm disappear as soon as the Zone
calculation is right.
Alarm Latched:
The Zone is blocked, the blocking disappears as soon as the Zone calculation is right but
the alarm disappears only after manual reset.
Blocking Latched:
The Zone is blocked and both the blocking and the alarm disappe
ar only after manual
reset.
PU Error Timer 5.0s 0.0s 600.0s 0.1s
Setting for the operating time delay of the PU error options
PU Error tReset 5.0s 0.0s 600.0s 0.1s
Setting for the reset time delay of the PU information error.