GE MiCOM P40 Agile User Manual

Current Reversal Guard
The recommended settings are as follows:
● Where Duplex signalling channels are used: Set tReversal Guard to the maximum signalling channel
operating time + 20ms.
● Where Simplex signalling channel is used: Set tReversal Guard to the combination of the maximum
signalling channel operating time, minus the minimum signalling channel reset time, and add 20ms.
7.4
AIDED DEF POR SCHEME
This scheme allows an instantaneous DEF trip of a local terminal if it sees a forward fault AND it receives a signal
from the remote end protection indicating that it is too has seen a forward fault.
The logic is:
● Send logic: DEF forward
● Permissive Trip logic: DEF forward plus channel received
The time delay would normally be set to 0 ms.
7.5
AIDED DEF BLOCKING SCHEME
This scheme prevents DEF tripping of a local terminal if it receives a signal from the remote end protection
indicating that the fault is in the reverse direction, and hence out of zone.
The logic is:
● Send logic: DEF reverse
● Trip logic: DEF forward plus channel NOT received, with a small set delay
To allow time for a blocking signal to arrive, a short time delay on aided tripping must be used. The recommended
delay time setting (Aid. 1 DEF Dly., Aid. 2 DEF Dly.) is the maximum signalling channel operating time +20 ms.
7.6
AIDED DELTA POR SCHEME
This scheme allows an instantaneous Delta trip of a local terminal if it sees a forward fault AND it receives a signal
from the remote end protection indicating that it is too has seen a forward fault.
● Send logic: Delta fault Forward
● Permissive Trip logic: Delta fault Forward plus channel received
The time delay (Aid. 1 Delta Dly, Aid. 2 Delta Dly) should be set to 0 ms for fast fault clearance.
Current Reversal Guard
Current reversals during fault clearances on adjacent parallel lines need to be treated with care.To prevent
maloperation, a current reversal guard timer must be set.
The recommended setting (tReversal Guard) is the maximum signalling channel reset time + 35 ms.
7.7
AIDED DELTA BLOCKING SCHEME
This scheme prevents Delta tripping of a local terminal if it receives a signal from the remote end protection
indicating that the fault is in the reverse direction, and hence out of zone.
● Send logic: Delta fault reverse
● Trip logic: Delta fault forward plus channel NOT received, delayed by Tp (a short time delay)
Recommended delay setting (Aid. 1 Delta Dly, Aid. 2 Delta Dly): Maximum signalling channel operating time
+ 6ms.
Chapter 8 - Carrier Aided Schemes P543i/P545i
246 P54x1i-TM-EN-1

GE MiCOM P40 Agile Specifications

General

Brand	GE
Model	MiCOM P40 Agile
Category	Control Unit
Language	English