Alstom SHPM 101 - POR-Simplified Distance Scheme Logic

SERVICE MANUAL R5888B
QUADRAMHO Chapter 1
Appendix A
Page 6 of 8
OR
Zone -2
Zone -3
tZ2
tZ3
Relay A
Trip A
AND
Zone -1
OR
CB
contact
Signaling
channels
=
CB contact closed when circuit breaker is open
OR
Zone -2
Zone -3
tZ2
tZ3
Relay B
Ttrip B
AND
Zone -1
OR
CB
contact
Z
B
A
Zone -1
Zone -2
Zone -3
Z
XX XX XX XX
Zone -1
Zone -2
Zone -3
Figure 6: POR-simplified distance scheme logic (with ‘open terminal’ signal echo feature)