From: Wes Patterson [mailto:wes.patterson@us.abb.com]

Sent: Thursday, December 22, 2011 2:17 PM

To: Brian Coffey

Cc: Bob Smith; Christopher Bolduc; Eric Petersen; John Cymbalsky; Matthew Na rdotti; Michael Rivest;

Rob Greeson; Richard Parker

Subject: Re: MVDT Scaling

Hi Brian

Some minor editorial suggestions to the doc file

Basically I think we should go with the levels you have defined.

Reduction in watts relative to 2010 standard - looks ok

 1ph - no change = 2010 standard

 3ph - core market down 20%

reduction trails off as KVA decreases

 there is a problem with the 15 & 25 KVA, 3ph watts in that they are too low (see the ppt). But this

is because they are at the losses of the curr ent standard so I do not see any way to address it.

Understatement of losses due to inaccuracy of scaling rule - ok small KVAs still understated but this is be cause they are fixed by the 2010 standard

 but the error has been reduced everywhere

1ph watts versus 3ph watts - ok - better

 ideally should be 130% but this cannot be reached and still maintain current efficiency standard

on the 1ph products.1ph watts relative to 95BIL watts - ok

 no change - same as 2010 standard

3ph watts relative to 95BIL watts 45BIL - no change in relation - ok

 >95BIL - ok - was +4% now 10-14% higher

Most of the units >95BIL are al so >1000KVA. Thus these watts ar e effectively 13% greater than the

equivalent 95BIL.

And these >95BIL ratings represent a 15% reduction in losses as compared to a 22% reduction at 95BIL

rating.

While not ideal we increase the risk of circumvention by reducing the further.

And even at this level we have a potential issue he re - say if someone orders a 15kv unit at 96BIL.

Perhaps a way to address would be to add verbiage to the standard such that "the BIL Grouping shall be

consistent with the standard BIL as specified in C57.12.01-xxxx Table 5"

May recommendation is we stay with this.

For your reference material - thes e files have the calc for the above.

Best regards (and Merry Christmas)

WesBrian Coffey < brian.coffey@navigant.com >

12/21/2011 03:27 PM To John Cymbalsky < john.cymbalsky@ee.doe.gov >, Richard Parker

< richardparkerdc@gmail.com >, Wes

Patterson/SouthBoston/USTRA/ABB@ABB, Rob Greeson

< rgreeson@federalpacific.com >, Bob Smith < bsmith@federalpacific.com >,

Eric Petersen < Eric.Petersen@aksteel.com >

cc Michael Rivest < mrivest@navigant.com >, Christopher Bolduc

< cabolduc@lbl.gov >, Matthew Nardotti < matthew.nardotti@navigant.com >

Subject MVDT Scaling

Team,

I’ve attached a draft write

‐ up of the last Friday’s MVDT scaling discussion, as I’ve remembered it. Once we have

reviewed and edited this draft, we can distribute to the committee at

‐ large. Have I omitted any email addresses

from the call?

Best,

Brian

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