P44x/EN AP/Hb
MiCOM P40 Agile P442, P444
(AP) 5-
Figure 9: Phase-to-earth loop impedance
2.5 Tripping Logic
2.5.1 General
Three tripping modes can be selected ('Distance Scheme\Trip Mode' setting):
Single-pole trip at T1 (if “1P. Z1 & CR” is set): Single-pole trip for fault in zone 1 at T1 and
channel-aided trip at T1. All other zones trip three-phase at their respective times for any
fault types (
∅-G, ∅-∅, ∅-∅-G, ∅-∅-∅, ∅-∅-∅-G).
Single-pole trip at T1 and T2 (if “1P. Z1Z2 & CR” is set): Single-pole trip for Z1 at T1,
channel-aided trip at T1, and Z2 at T2. All other zones trip three-phase at their respective
times for any fault types (
∅-G, ∅-∅, ∅-∅-G, ∅-∅-∅, ∅-∅-∅-G).
Three-pole trip for all zones (Forces 3 poles): Three-phase trip for all zones at their
respective times for all fault types (
∅-G, ∅-∅, ∅-∅-G, ∅-∅-∅, ∅-∅-∅-G). Channel-aided
trips will be three-phase with times corresponding to the pilot logic applied.
Zone Time
Z1 T1
Z1X T1
Z2 T2
Zp Tp
Zq Tq
Z3 T3
Z4 T4
There are six time delays associated with the seven zones present. Zone 1 and extended
zone 1 have the same time delay.
Note: All the timers are initiated when the general start of the relay picks up (Z3Z4
convergence).
2.5.2 DDB inputs / outputs for General trip logic
The following DDB are available for CB monitoring (see section P44x/EN PL):
• Inputs
Three-pole trips (refer to the list in the logic diagram
Force 3P trip (see autoreclose section)
Dist trip a, Dist Trip B and Dist Trip C (see section “distance protection”),
WI trip A, WI Trip B and WI trip C (see section “weak infeed”)
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