GE Industrial Solutions Entellisys 5.0 User Manual - Manual (Page 141)

Ground Fault Tripping priority 141
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7.6.1 Setup
To set breaker priorities, navigate to the High Resistance GF settings screen (Main Menu,
Advanced Protection) and click Set GF Tripping Priority button to assign priorities.
Figure 7-15 Ground Fault tripping priority settings screen
Select Enabled to enable the Ground Fault Tripping Priority.
Topology Number: Lists only topology 1 and 0 and defaults to topology 1. Topology 1 will
always be used if there are more than one topology configured.
Priority Setting: Allows user to determine the priority between 1 and 30 to each breaker. Priority
1 is the highest priority. Thus, the breaker with priority 1 will be tripped last. Entellisys does not
allow two breakers to be assigned the same priority. If a breaker is set to None, then it will not
be considered - essentially disabling tripping priority for that breaker.
7.6.2 Usage
This function can be configured in many different permutations. It is possible to configure
Priority Tripping function where in some situations, it may delay a breaker in such a manner that
selectivity is undermined. Below are recommended configurations:
If the mains and ties have GF enabled, then GF ZSI should be used for selectivity between
the prioritized feeders and tiered mains, ties, and feeders.
If GF is not enabled on the mains and ties then priorities should only be assigned to
feeders.