GE P444 User Manual

P
44x/EN AP/Hb6
Application Notes
(AP) 5
-56 MiCOM P40 Agile
P442, P444
3.2.2 Trip Mode
The tripping mode is settable using the three following modes:
• Force 3 Poles: three-pole trip (in all cases)
• 1 Pole Z1 & CR: single pole trip at T1 when a fault is detected in zone 1 (Z1) or at CR
(Carrier Receive) reception. Otherwise, three pole trip.
• 1 Pole Z1 Z2 & CR: single pole trip at T1 when a fault is detected in zone 1 (Z1) or in
zone 2, or at CR (Carrier Receive) reception. Otherwise, three pole trip.
The following table summarizes the tripping zones:
Tripping mode T1 T2 Tzp T3 T4
1 Pole Z1 Z2 & CR 1P 1P 3P 3P 3P
1 Pole Z1 & CR 1P 3P 3P 3P 3P
Force 3 Poles 3P 3P 3P 3P 3P
1P: 1-pole trip, 3P: 3-pole trip.
T1…T4:
End of distance time-delay for the zone
Several preset aided trip logic schemes can be selected or an open logic scheme can be
designed by user.
3.2.3 Carrier send Zone (open scheme)
When a fault is detected in zone 1 or zone 2, the CsZ1 or CsZ2 (Carrier Sent by Zone 1 or 2)
signal is emitted from the zone to the relay. As shown in the following zone logic
configuration diagram, zone 4, behind the relay, will provide a reverse directional decision
faster than zone 2. So, the CsZ4 signal used for Carrier Send mode is a reverse signal.
The zone decision logic is described as below:
Figure 35: “Carrier SenD” zones
When a scheme is required which is not covered in the Standard modes above, the Open
programming mode can be selected. The user then has the facility to decide which distance
relay zone is to be used to key the signal, and what type of aided scheme runs when the
signal is received.
Setting Signal Send Zone Function
None No Signal Send To configure a Basic scheme.
CsZ1 Zone 1 To configure a Permissive scheme.
CsZ2 Zone 2 To configure a Permissive scheme.
CsZ4 Zone 4 To configure a Blocking scheme.
Table 3: Carrier send zones in open schemes
Carrier send can be triggered by Zone1 (CsZ1), Zone2 (CsZ2) or Zone4 (Reverse, CsZ4).
The following decision logic
The “carrier send” signal drop off is time-delayed (10ms) to avoid an interaction with zone
pick-up.
When activated, Z2 can overlap Z1. The following equation decribes the carrier send (CS)
logic, including Weak Infeed Carrier Send (WI_CS) echo:
CS (
Main channel Carrier send) = (Z1' + Z2').CsZ2 + Z1'.CsZ1 + Reverse.CsZ4 + WI_CS
Where:

GE P444 Specifications

General

Brand	GE
Model	P444
Category	Protection Device
Language	English