GE Industrial Solutions Entellisys 5.0 User Manual - Manual (Page 95)

Advanced Protection Relays 95
5
Location Subinterval: (20-60 seconds, default 30) defines the minimum duration of pulsing
required before initiating a location event.
Start Automatic Location: Default checked - starts location automatically after a fault is
detected.
Trip group box
Time Delay: (0 to 999 hr in 1 hr increments, 0 will trip immediately) Time the system will wait
before issuing a trip command to a feeder. Note: Only available for feeders.
Alarm Settings group box
Re-Alarming Time Delay: (0 to 99 hr in 1 hr increments, 0 is disabled) Turns the
acknowledged alarm back to un-acknowledged (blinking) and logs a single event.
Alarm Re-Check Time Delay: 0 to 99 hr in 1 hr increments0 is disabled) Logs event every
interval only after re-alarm if fault still exists. Does not change the fault alarm acknowledge
state.
5.3.2.4 Tripping
Once a fault has been detected and located, the trip timer will begin timing only on breakers
classified as feeders. Once the trip timer times out, the faulted feeder will only trip after the
location relay verifies that it is still faulted by re-running the location routine.
If, before the breaker is tripped, the detection relay drops out then the system will wait for up to
30 seconds before resetting the trip timer. If the fault reoccurs within 30 seconds, the trip timer
will continue timing.
While timing out, if the located breaker is opened and the detection drops out then the function
is reset. If detection does not drop out then locate will find and restart timing for a new faulted
breaker.
Lastly, if the detection relay is still active but the fault originally located is not verified by the
system, the system will attempt 10 times to locate the breaker every 30 minutes or until the
detection relay drops out. If the location verification identifies a different faulted breaker, trip
timing will be restarted for the newly faulted breaker.
The system will only trip a breaker if the following conditions are met
• The breaker has been designated as a feeder (factory configuration)
• Location trip has been enabled
• Trip timer has timed out
• The location function has verified that the breaker is still faulted
If the Trip Time Delay is set to 0, then the location verification and retry attempts will occur
immediately without the 30 minute delay and immediately trip the breaker after location
verification.
How to determine if a breaker is configured to trip:
1. Login to the HMI as an administrator and navigate to the Maintenance screen
2. Select the “Zone Configuration” tab
3. Select the High Resistance GF button - See Figure 5-15