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Tripping of synchnous machine in psse

asked 2022-12-22 09:35:23 -0600

Harikrishna gravatar image

updated 2022-12-22 09:36:04 -0600

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 ?

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Can you show the tripping message from Progress Window?

perolofl gravatar imageperolofl ( 2022-12-22 13:22:52 -0600 )edit

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.

Harikrishna gravatar imageHarikrishna ( 2022-12-27 05:55:05 -0600 )edit

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answered 2022-12-30 05:27:08 -0600

perolofl gravatar image

updated 2023-01-02 02:21:29 -0600

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.


Check if option "Scan generators exceeding speed deviation threshold" is enabled in Dynamic Simulation Options:

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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
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Asked: 2022-12-22 09:35:23 -0600

Seen: 380 times

Last updated: Jan 02