44x/EN AP/Hb6
-82 MiCOM P40 Agile
3.5.1.3 Zone 1 extended
The following trip logic represents the zone 1 extended logic:
Figure 56: Zone 1 extended (Z1X) trip logic
Z1X can be used as well as the default scheme logic in case of UNB _Alarm-carrier out of
service (See unblocking logic – Section 3.2.6)
Where:
Description
‘COS alarm’
Alarm channel (main and DEF)
Z1x, Z1 Z1X, Z1 Decision (lock out by Power Swing)
T1 distance timer 1, 2, 3, 4, p or q elapsed
3.5.2 Channel Aided distance scheme logic
3.5.2.1 Loss of Load
The next figure shows the loss of load trip logic:
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