GE Industrial Solutions Entellisys 4.0 System User Manual - Manual (Page 135)

Relay Settings 135
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8.3.3 User settings for Zone Selective Interlock
A ZSI zone is made of one or more MSGF zones, and main, tie, and feeder circuit breakers. A ZSI
zone can be either a ZSI-Short Time zone, ZSI-Ground Fault zone or both.
ZSI-Short Time zone
•
Members limited to main, tie, and feeder circuit breakers.
•
All main and tie circuit breakers should be assigned a tier number of 0 for Topology 0.
ZSI-Ground Fault zone
•
Members can be MSGF zones, and main, tie, and feeder circuit breakers.
•
All MSGF zones, and main and tie circuit breakers should be assigned a tier number of 0 for
Topology 0 (see Figure 8-7).
Figure 8-7 Reduced Energy Let-Thru Mode settings for Zone Selective Interlock