Trip Mode; Carrier Send Zone (Open Scheme); Carrier Send Zones In Open Schemes - GE MiCOM P40 Agile Technical Manual

P44x/EN AP/Hb6
(AP) 5-56
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
1 Pole Z1 Z2 & CR
1 Pole Z1 & CR
Force 3 Poles
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
None
CsZ1
CsZ2
CsZ4
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:
T1
1P
1P
3P
Signal Send Zone
No Signal Send
Zone 1
Zone 2
Zone 4
MiCOM P40 Agile P442, P444
T2 Tzp T3
1P 3P 3P
3P 3P 3P
3P 3P 3P
Function
To configure a Basic scheme.
To configure a Permissive scheme.
To configure a Permissive scheme.
To configure a Blocking scheme.
Application Notes
T4
3P
3P
3P