Recent content by MRasool

  1. M

    Generator Tripping on Seismic Probe

    Hey Phil, Well, we did not observe any increase in Vibration magnitude of any proximity sensors prior to trip. Actually it would have been so much easier had we configured trending on these values. Unfortunately in the packaged unit only events triggering is captured i.e. if vibration increases...
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    Generator Tripping on Seismic Probe

    Happy Anniversary Phil! May your family always find love in their hearts and blessings on their table. Interesting case study you shared. Thanks. In our case, we had proximity and seismic probes both installed on bearings, so had it been Morton, the proximity probes would have picked up...
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    Generator Tripping on Seismic Probe

    Hey Phil, Sorry for the late response as I was away on leaves. Happy new year to you! Getting straight to your questions: 5. How about details on generator enclosure: Drip proof; TEFC; air cooled with air from non-hazardous area. If the latter what is shaft-bushing material? If your answer is...
  4. M

    Generator Tripping on Seismic Probe

    @WTF? Can the power supply to B-N cards or the Vibration cards cause this issue? I mean if there is a power dip in DC circuit or some sort of intermittent supply failure? Have you witnessed anything of this sort due to power supply issues? Regards, MRasool
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    Generator Tripping on Seismic Probe

    Hello, I am all for sharing knowledge as well, however few documents you can't share on public forums. Yes, I was rechecking the log and I noticed that both the vibration probes are going to alarm levels together and coming back together as well. However, there is a delay of 1 to 2 secs...
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    Generator Tripping on Seismic Probe

    Hello Phil! I hope you are doing well. 1. Do the trips occur with some regularity with regard to activity, such as shift change? No, this actually happened for the first time since commissioning of this machine. Time was almost a shift change i.e. morning outgoing and evening incoming. 2. Do...
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    Generator Tripping on Seismic Probe

    Hello, First off, thank you very much for the detailed reply. It was insightful. Now to answer your questions: 1- Make of Generator is BRUSH Electric.(Commissioned in 2008) 2- Packager is Nuovo Pignone. 3- The Seismic Sensors are Bentley Velomitor® Sensors. 4- We have a Mark-6. (Not a...
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    Generator Tripping on Seismic Probe

    Dear all, I hope you are in the best of health and spirits. I need help in understanding root-cause of a recent tripping on one of the generator units at my workplace. The generator is coupled with Gas Turbine Frame-5001PA. Generator details are: Type DG185ZL Rated Power - 26 MVA Power...
  9. M

    Sparking at Negative more than at Positive Carbon Brush

    In my opinion, since the electrons in the DC circuit flow from Negative Terminal to Positive Terminal that is why the heating is more at the entry point i.e. -ive carbon brush, as opposed to the exit point i.e. +ive one. But that's just a thought. Ideas anyone?
  10. M

    Sparking at Negative more than at Positive Carbon Brush

    Dear all, I recently observed that a full load i.e. 13MWs, on our gas turbines there is a little sparking observed at the carbon brushes and collector ring contact points. The interesting thing is that the sparking is more at negative brushes than the positive. Any idea why this is the case...
  11. M

    Diagnostic Alarm P:449 on GE EX2K

    Hey guys, Recently we had a diagnostic alarm on GE EX2K with ID: 449. It got reset. Anyone know what this is? Please assist. Regards, Mutahir
  12. M

    Gas Turbine GCV Clamp

    I would like to know what you guys think on following scenario: A Network has 4 Gast Turbines which are synced and all are in Droop mode. One of Gas Turbine among them, has a GCV clamped at 8MW output. On a particular day, what happens is that even with GCV clamped, the output reduced by 1MW...
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    NFPA/NEC Vs. ATEX Directive

    Hey guys, I was having a discussion on electrical motors area classification with an ATEX certified professional(IECEx CP) and I was quoting him NFPA 70 Article 501 for a case. His comments were that NFPA does not offer much information or training on this subject. *QUOTE* ''NFPA – No such...
  14. M

    MCBs Issue

    That's a whole new debate. The design team looks after sizing. As a maintenance guy, I know the load is consistent at 2.4A and the 2A breaker is supplying that load since some years without any issue. However, we have installed a 4A breaker now. Regards, MRasool
  15. M

    MCBs Issue

    Thanks Phil. But since the breaker has been ON since 5 years, as the PLC supplies a critical service(which we can't shutdown) there is no 'contacts parting' experienced on the MCB. Regards, Mutahir
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