P44x/EN AP/Hb
MiCOM P40 Agile P442, P444
(AP) 5-
Figure 25: PUP Z2 permissive underreach scheme
Trip logic:
IEC Standard
Carrier
Send
Trip Logic Application
User
setting
448.15.13 PUR or AUP Z1
Z2.CR.’Aid Dist Delay’ + Z1.T1 + Z2.T2
+ Z3.T3...
Z1 = 80% ZL PUP Z2
3.2.1.2.2 Permissive Underreach Protection Tripping via Forward Start (PUP Fwd)
This scheme allows an instantaneous Z2 or Z3 trip on receipt of the signal from the remote
end protection. Figure 26 shows the simplified scheme logic.
If the remote relay has picked up in a forward zone and the underimpedance element has
started, then it will trip after the transmission time delay (‘Distance schemes / Aid Dist Delay’
setting) upon reception of the permissive signal from the other end of the line.
Send logic: Zone 1
Permissive trip logic: Underimpedance Start within any Forward Distance Zone, plus
Channel Received.
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