Dear SME,
322 MW STG unit experienced trip subject to sudden closure of dual MSV & CV lines without any trip event record from L40 CKT for M6E or any other trip signals.
Sequential trip occured subject to sudden closure of Steam valves (MSV1,2, CV1,2)
1) MSV-1/2 closed and CV-1 & 2 also closed and opened event trend observed 2) Event in Live trip data server.
2)ST16 - CONTROL VALVE TRIGGER OCCURRENCE - LCVT_EVT – ALARMED and ST16 - CONTROL VALVE TRIGGER OCCURRENCE - LCVT_EVT – NORMAL
3) ST16 - Hyd Fluid Pump #1 Running-Closed When Running - l63hq1_run [PDIO-45Contact09] - ALARMED
[This signal is derived from pressure switch (PS-280B) of pump #1 discharge pressure monitoring, when pressure going below 161.7 Kg/cm2 this alarm will generate.]
4) As part of sequential trip configuration for 9FA occured as Steam valve closed/Limit switches closed reseluted for pick up of -33ST-33STX-32-1,2 GCB OPEN from GPP-generator protection panel.
Kindly let us know any of the sites experienced similar trip in ST units. Appreciate experts to share their experiences in fleet.
322 MW STG unit experienced trip subject to sudden closure of dual MSV & CV lines without any trip event record from L40 CKT for M6E or any other trip signals.
Sequential trip occured subject to sudden closure of Steam valves (MSV1,2, CV1,2)
1) MSV-1/2 closed and CV-1 & 2 also closed and opened event trend observed 2) Event in Live trip data server.
2)ST16 - CONTROL VALVE TRIGGER OCCURRENCE - LCVT_EVT – ALARMED and ST16 - CONTROL VALVE TRIGGER OCCURRENCE - LCVT_EVT – NORMAL
3) ST16 - Hyd Fluid Pump #1 Running-Closed When Running - l63hq1_run [PDIO-45Contact09] - ALARMED
[This signal is derived from pressure switch (PS-280B) of pump #1 discharge pressure monitoring, when pressure going below 161.7 Kg/cm2 this alarm will generate.]
4) As part of sequential trip configuration for 9FA occured as Steam valve closed/Limit switches closed reseluted for pick up of -33ST-33STX-32-1,2 GCB OPEN from GPP-generator protection panel.
Kindly let us know any of the sites experienced similar trip in ST units. Appreciate experts to share their experiences in fleet.
