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Hi all, Long duration of 3 ph fault is applied at machine terminals. It is noticed that machine tripped off due to overspeed protection relay though no relays placed machine terminals. What is the reason?. Is action intitiated by any overspeed relay placed at other machine ?
Model NRCGP3U may be used to supervise and trip generators in an area, zone etc.
Check the DYRE-file for any call of 'NRCGP3U'.
Check also spreadsheet Dynamics Data - Protection Models - Machine for any tripping models.
Edit:
Check if option "Scan generators exceeding speed deviation threshold" is enabled in Dynamic Simulation Options:
However, the progress window trip message looks like this so it is not causing your trip:
Machine 1 at bus 3018: PU speed Deviation= 0.05057; PU overspeed Threshold= 0.10000
MACHINE 1 AT BUS 3018 [CATDOG_G 13.800] TRIPPED AT TIME = 1.4300
Asked: Dec 22 '2
Seen: 560 times
Last updated: Jan 02 '23
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Can you show the tripping message from Progress Window?
Hi @perolofl Please see command window message At TIME=0.56 timer reset, EFD = 5.44 ***MACHINE S1 AT BUS ***** TRIPPED BY OVERSPEED RELAY AT TIME = 3.0241 SECS. MACHINE S1 AT BUS XXXXXX(ABCDEFG) TRIPPED AT TIME = 3.0241 COULD you please us to identify the issue Thanks in advance.