GE P444

Application Notes
P44x/EN AP/Hb
6
MiCOM P40 Agile P442, P444
(AP) 5-
85
2. The inputs Z1X must be polarised for activating Z1X the logic.
3 For the 1P – 3P trip logic check in the Tripping logic section.
Accronyms used in the previous equation:
• Inputs:
Description
T1 to, T2, T3, T4,
TZp, TZq
Elapsed of Distance Timer 1 to 4 (T1 / T2 / T3 / TZp / TZq / T4)
‘Aid Dist Delay’ Elapse of d transmission time in blocking scheme
Z1’, Z2’, Z3’, ' to
Z4' (*), Zp’, Zq’
Detection of fault in zones 1 to 4
(lock out by PSWing or Rev Guard).
Forward’ Forward Fault Detection l (lockout by reversal guard)
UNB_CR Carrier Received
INP_COS Carrier Out of Service
None Scheme without carrier
PZ1 Permissive scheme Z1
PZ2 Permissive scheme Z2
PFwd Permissive Scheme with directional Fwd
BZ1 Blocking scheme Z1
BZ2 Blocking scheme Z2
INP_Z1EXT
Zone extension (digital input assigned to an opto input by
dedicated PSL)
Z1xChannel Fail
Z1x logic enabled if channel fail detected (Carrier out of
service = COS)
UNBAlarm Carrier Out Of Service
• Outputs:
Description
PDist_Dec Distance protection Trip trip
CsZ1 Carrier send in case of zone 1 decision
CsZ2 Carrier send in case of zone 2 decision
CsZ4 Carrier send in case of zone 4 decision (Reverse)