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Enron Mail |
---------------------- Forwarded by Hollis Kimbrough/EWC/Enron on 03/07/2002
02:00 PM --------------------------- Hollis Kimbrough 03/07/2002 01:44 PM To: Klaus Holtel/DEVELOP/TWT/DE@TWTDE cc: Ulrich Schomakers/SERVICE/TWT/DE@TWTDE, Benjamin Bell/EWC/Enron@ENRON, Jeff Maurer/EWC/Enron@ENRON, Jeff Marecic/EWC/Enron@Enron Subject: Re: Antwort: Availability Definitions Hello Klaus, I am trying to do a comparison between the 1.5 MW availability definitions used in Germany versus the one used here in the US. Per your attached e-mail, we both use the Enron Availability (EA) definition, however the definitions are different due to the number of available counters in the PLC and the placement of the "MT" term in the equations. In Europe you are limited to 4 counters while the US VisuPro has 7 and in Europe you include the MT term in both the numerator and the denominator while in the US we only include it in the denominator but we deduct 4 hours per month as a maintenance allowance. With respect to the timers, the differences center on how 8 status timers are treated which result in a slightly higher availability for US turbines given the same operating conditions. The status timers are: "Overvoltage", "Undervoltage", "Underfrequency", "Overfrequency", "Outside Temperature too low", "Gear oil temp too low", "Line fault voltage" and "Line fault frequency". In the European EA these values are counted as "Down Time" and are added in the denominator but not in the numerator resulting in a larger denominator and therefore a lower overall availability. In the US EA these terms are added in both the denominator and the numerator thereby resulting in no change, either negative nor positive. With respect to the "MT" term, the European EA includes this number in both the numerator and denominator which means the "MT" term does not affect European EA regardless of how much time a European turbine stays in maintenance mode. In the US the use of the "MT" term results in a lower EA result for values where the maintenance time exceeds 4 hours per month (48 hours per year). This brings me to my questions: 1. Do the 8 status timers result in very significant impact on the EA term in Germany and throughout Europe? 2. Can you quantify, in percent EA, the impact of these 8 status timers for some typical turbines? 3. Can you give me an example of how much "MT" time you accumulate in a month for a typical turbine? If you have any other thoughts or ideas on how we might quantify the differences between the two EA definitions I would like to hear them. Best Regards, Hollis ---------------------- Forwarded by Hollis Kimbrough/EWC/Enron on 03/06/2002 03:09 PM --------------------------- Klaus Holtel@TWTDE 03/06/2002 02:09 AM To: Hollis Kimbrough/EWC/Enron@ENRON, Ulrich Schomakers/SERVICE/TWT/DE@TWTDE, Benjamin Bell/EWC/Enron@ENRON, Jeff Maurer/EWC/Enron@ENRON, Klaus Eilermann/SERVICE/TWT/DE@TWTDE cc: Klaus Eilermann/SERVICE/TWT/DE@TWTDE, Andrea Meiners/SERVICE/TWT/DE@TWTDE, Uwe Geisink/SERVICE/TWT/DE@TWTDE Subject: Re: Antwort: Availability Definitions Hi Hollis, in VisuPro we have two different calculations of "EA" = Enron Availability. One for new VisuPro version and PLC program for USA (Montfort, Klondike, ...) and the other for the old VisuPro version for Europe. The Remote Control department use for the montly availability report to Adam Umanoff the calculation: Enron Availability: EA[%] = (SOT+ MT) / (SOT+DT+MT+RT) * 100% Europe: The running PLC program of the Bachmann controller in Europe supports only 4 Timer: Timer: System Ok Time SOT Down Time DT Maintenance Time MT Repair Time RT Survey Time (ST) = SOT+DT+MT+RT Availability: Enron Availability: EA[%] = (SOT+ MT) / (SOT+DT+MT+RT) * 100% USA: The PLC program and VisuPro for USA supports 7 Timer: Timer: System Ok Time SOT Down Time DT Maintenance Time MT Repair Time RT Line Out Time LOT Weather Out Time WOT External Stop Time EOT Survey Time (ST) = SOT+DT+MT+RT+LOT+WOT+EOT Availability: Enron Availability: EA[%] = (SOT+LOT+WOT+EST) / (SOT+DT+LOT+WOT+EST+MT+RT) * 100% Kind Regards, Klaus Holtel & Klaus Eilermann ---------------------- Weitergeleitet von Klaus Holtel/DEVELOP/TWT/DE am 06.03.2002 09:44 --------------------------- Klaus Eilermann 06.03.2002 09:25 An: Klaus Holtel/DEVELOP/TWT/DE@TWTDE Kopie: Thema: Re: Antwort: Availability Definitions wie besprochen ... ----- Weitergeleitet von Klaus Eilermann/SERVICE/TWT/DE am 06.03.02 09:27 ----- Ulrich Schomakers 05.03.02 21:23 An: Klaus Eilermann/SERVICE/TWT/DE, Andrea Meiners/SERVICE/TWT/DE, Uwe Geisink/SERVICE/TWT/DE@TWTDE Kopie: Thema: Re: Antwort: Availability Definitions Klaus, could you please answer that email and explain it correctly, that everybody understands it. Discuss that with Andrea and Uwe. Please do that tomorrow. Thanks Uli ---------------------- Weitergeleitet von Ulrich Schomakers/SERVICE/TWT/DE am 05.03.2002 09:21 PM --------------------------- Hollis Kimbrough@ENRON 05.03.2002 07:53 PM An: Ulrich Schomakers/SERVICE/TWT/DE@TWTDE Kopie: Thema: Re: Antwort: Availability Definitions Uli, At the bottom of this document there are 4 calculations for availability. They are Machine, Operational, Line and Enron Availability. Which one of these availabilities do you include in your monthly reports to Adam when you are reporting availability? Best Regards, Hollis Ulrich Schomakers@TWTDE 02/22/2002 06:35 AM To: Hollis Kimbrough/EWC/Enron@ENRON cc: Benjamin Bell/EWC/Enron@ENRON, Jeff Maurer/EWC/Enron@ENRON Subject: Antwort: Availability Definitions Hollis, here our calculation. Best regards Uli Hollis Kimbrough@ENRON 21.02.2002 07:49 PM An: Ulrich Schomakers/SERVICE/TWT/DE@TWTDE Kopie: Benjamin Bell/EWC/Enron@ENRON, Jeff Maurer/EWC/Enron@ENRON Thema: Availability Definitions Hello Ule! In the Senior Management reporting (for Adam) can you provide me a definition of the availability terms you propose to use? We want to compare them to the definitions we are going to use to ensure that they are similar. Right now our plan is to use the Enron Availability definition (SOT+LOT+WOT+EST)/(SOT+DT+LOT+WOT+EST+MT+RT) from the VisuPro system for the 1.5 MW WTG and the Machine Availability (Op Hours/ Line Hours) for the other turbines. Best Regards, Hollis
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