From:Corkran, Jerry L [mailto:Jerry.Corkran@CooperIndustries.com]Sent:Thursday, October 06, 2011 6:22 PMTo:Robert Berman; Brian CoffeyCc:Alex Hofmann; Andrew Delaski; Aris Marantan; Art Rosenfeld;Bob Saint; Bruce Smith; Caitlin Johnson; Carlos Gaytan; Caskey, John; Charlie Drexler; Charlie Stevens; Chris Bolduc; Clark Silcox;Creevy, Jim; Dan Cohen; Daniel Young; Eric Peterson; Freeman,Jeremiah;Gary Fernstrom; Greg Coulter; Greg Rosenquist; Hirsch, Bruce R;James Lass; Jennifer Tiedeman; Phil Hopkinson; Jerry Hodge; Jerry Schoen; Joanna Mauer; John Cymbalsky;John Rossetti; Katie Coughlin; Ken Winder; Mahesh P. Sampat; Matt Miller; Matthew Nardotti; MegWaltner; Meyers, Aaron; Michael Hyland; Michael Rivest; Millure, Dave; Phil Harter; Phil Hopkinson; Polinski, Raymond; Puesh Kumar; Richard Parker; Rick Anderson; Rob Greeson; Robert van Buskirk; Robin Roy; Ryan, Paul; Scott Beck; Simmons, Chuck; Steve Nadel; SteveRosenstock; Tim Ballo; Tom Eckman; Wes Patterson; Zhimei Luo; Marusinec, Richard M; Trujillo, Antonio; Ruppel, David J; Moore,Jack CSubject:RE: Engineering Data ExchangeRegardingMr.Berman’scomments,theAandBfactorsaregoodadditions.RegardinghisandotherindividualssuggestionsforchangesinhowtheDOEhandlesthelosses,IsuggestthecommitteestaywiththeIEEE/ANSIstandardswhichwerewrittenbyaveryexperiencedgroupofengineerswithhundredsofyearsofexperiencebuildingandusingtransformers.ThesuggestionsbythevariousspecialinterestgroupstodivergefromthewellthoughtoutIEEE/ANSIconsensusstandardsinterjectareinventingthewheelatmospheretotheDOETransformerEfficiencyworkinggroupthatwillresultinlittleprogresstomeetourobjectives.ThetwoattachmentsareveryinformativeabouthowtheNEMATP‐1standardwasconceived.TheLoadingcompanyslidescanbediscussedattheupcomingmeetingbyPhilHopkinsonwhowastheauthoroftheseattachments.HehasbeenaskedtoattendthenextDOEWGmeetingbyseveraloftheWorkingGroupmembers.Iftherearequestionsabouttheseattachmentsbeforethemeeting,pleaseaddressthemtoPhilHopkinson.Regardingthediscussionsabouttransformerloading;IamsuggestingthatthecommitteemembersrefertotheNEETRAC Distribution Transformer Thermal Test ProcedureRevision 02 29 May 2002. This standard contains a composite load cycle included in section F ofthis standard that shows the 24 hour loading cycle generated asan example by combining 27 U.S. utility load cycles as shown inthe graph listed below. From this standard, the 24 hour expected loading is shown on an hour by hour basis in Annex F. Theper unit load comesout to about 83.5% of the full load rating for the 24 hour daily loading cycle. The calculation listed below came out to a 105 year life. What this meansthat when the IEEE overload guidescall for the transformer to receive a much higher loading including overloading up to300% for 30 minutes for pole type liquid filled transformers andup to 200% for other distribution transformers. When these over loads are considered, the expected life is back to the 20.5 years of predicted life according to the IEEE standards.For anyone who still questions the 20.5 yearaverage expected transformer life, I challenge them to look at some transformers that are 20 and 30 years old. Rust is a major concern for the old transformers. Safety to life and property is a risk for transformers kept in servicewhen they should be replaced.

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# Light IRegards,JerryCorkranFrom:Robert Berman [mailto:bermaneconomics@gmail.com]Sent:Thursday, October 06, 2011 7:17 AMTo:Brian CoffeyCc:Alex Hofmann; Andrew Delaski; Aris Marantan; Art Rosenfeld;Bob Saint; Bruce Smith; Caitlin Johnson; Carlos Gaytan; Caskey, John; Charlie Drexler; Charlie Stevens; Chris Bolduc; Clark Silcox;Creevy, Jim; Dan Cohen; Daniel Young; Eric Peterson; Freeman,Jeremiah;Gary Fernstrom; Greg Coulter; Greg Rosenquist; Hirsch, Bruce R;James Lass; Jennifer Tiedeman; Corkran, Jerry L; Jerry Hodge; Jerry Schoen; Joanna Mauer; John Cymbalsky;John Rossetti; Katie Coughlin; Ken Winder;Mahesh P. Sampat; Matt Miller; Matthew Nardotti; MegWaltner; Meyers, Aaron; Michael Hyland; Michael Rivest; Millure, Dave; Phil Harter; Phil Hopkinson; Polinski, Raymond; Puesh Kumar; Richard Parker; Rick Anderson; Rob Greeson; Robert Berman;Robert van Buskirk; Robin Roy; Ryan, Paul; Scott Beck; Simmons,Chuck; SteveThecompositeloadcycleprovidesanasexpectedshapeofanearlymorninglow withalateafternoonpeak.Thecompositeloadcycle, whenappliedtoANSIexampletransformercharacteristicsprovidesthefollowingresults:LoadCycleand/orAmbientModification:GlobalLoadProfileMultiplier1.001.048MaximumPeakLoadGlobalAmbientTemp.Adder:00°C0.564MinimumLoad0.835EquivalentLoadLoadCycleLossofLifeSummaryResults:perANSIperANSIC57.91-1995C57.91-1981AverageDailyLifeConsumptionFeqa=0.195days0.2089daysAverageDailyPercentLossofLife%loss=0.0026%0.0028%NSILife(guidelineof180,000hrsor2055yrs)Life=105.4yrs98.4yrsANSIC57.91-1981TransformerExample(Table3)AverageDailyAmbientTemperatureTamb=25.0°CMinimumDailyTopOilTemperatureTOTmin=59.9°CMinimumDailyHotSpotTemperatureHSTmin=71.0°CMaximumDailyTopOilTemperatureTOTmax=79.8°CMaximumDailyHotSpotTemperatureHSTmax=105.8°CNadel; Steve Rosenstock; Tim Ballo; Tom Eckman; Wes Patterson; Zhimei LuoSubject:Re: Engineering Data ExchangeGood Morning Brian,The most significant design details missing from the spreadsheet are the A & Bfactors for the least-cost design of each CSL/dEL/TSL and the no-load or core losses andthe load or coil losses. I recommend thatthe latter be shown at75C and that thetemperature rise also be shown as75C rather than 65C. Showing the weight of the core assembly,radiator size and weight and insulation would also be helpful. The A & Bfactors are the best measureof the costs we are tryingto avoid (not consideringenvironmental or social costs) by setting a particularCSL/dEL/TSL as a MEPS.Finally, it's not clear why we are sill looking at core steel grade below M3 forliquid-filled. My understanding is that M3 isthe lowest grade that can reasonablybe used under current standards.Regards,RobertA.Berman,PrincipalBermanEconomicswww.BermanEconomics.com1915GrandCourtVienna,VA22182703‐281‐0490703‐655‐8398(cell)BermanEconomics@gmail.comOn Oct 4, 2011, at 4:10 PM, Brian Coffey wrote:MVCommitteeMembers,SeveralofthegrouphaveproposedthatDOEfacilitateabidirectionalexchangeofengineeringdata.Attachedisonekindoftemplatethatcouldbeusedtocomparethewaysinwhichdifferentpartiescanachievecertainefficiencylevels.DOEwouldpopulatethespreadsheetwithdetaileddesigninformationfortheleastcosttransformersabletoachievethedraftefficiencylevelsusingdifferentsteels.DataprovidedtoDOEcouldthenbecomparedtotheDOEdesignsanddifferencesexplained.Becausethisdatawouldlikelybeconsideredconfidential,Navigantiswillingtoenterintonondisclosureagreementswithanypartysubmittingsuchdata.Thisprocesswouldfirstbeusedtoverifytheengineeringanalysisofthecurrentrepresentativeunitsandcouldbeexpandedtoanalyzescalingrelationships.Wewelcomecommentsandspecificsuggestionsofhowthisprocesscouldbeimplemented.Best,BrianCoffey______________________________________________________________Brian Coffey| Senior Consultant | Energy | Navigant Consulting, Inc.1801 K Street NW | Suite 500 | Washington, DC 20006+1.202.481.7521 OfficeThis communication is from Navigant Consulting Inc. E-mail textor attachments may contain information which is confidential and may also be privileged. This communication is for the exclusive use of the intended recipient(s). If you have received this communication in error,please return it with the title "received in error" toNCISecurity@navigant.com, and then delete the email and destroy any copies of it. In addition, this communication is subject to, and incorporates by reference, additional disclaimers found in Navigant Consulting's "EmailDisclaimer" section atwww.Navigant.com.Navigant Consulting, Inc.Company Registration Number: UK Ltd. 3641719Registered in Delaware, USARegistered Office Address: 30 South WackerDrive, Suite 3400, Chicago, Illinois 60606<EngineeringValidationTemplate‐20111004.xlsx>