‐‐‐‐‐Original Message‐‐‐‐‐ 

From: Rob Greeson [mailto:rsg‐fp@electro‐mechanical.com]  

Sent: Wednesday, December 21, 2011 10:09 PM

To: Brian Coffey

Cc: John Cymbalsky; Richard Parker; Wes Patterson; Rob Greeson; Bob Smith; Eric

Petersen; Michael Rivest; Christopher Bolduc; Matthew Nardotti

Subject: Re: MVDT Scaling

Team,

I believe I like most of what I see here.

(1) The zero change in efficiency level for 75 KVA and less is very good.

(2) The zero change for 1‐phase is good.  This exercise has shown that the 1‐

phases have been equivalently much lower than the 3‐phase since the beginning.  

This also eliminates the high rise concerns for this product.

(3) The 10% adjustment for the lower BIL's and higher BIL's was not straight

across the board but I am assuming this was done to smooth out the curve.  I

think it looks ok.

(4) The DL13 (EC10) design line is still not quite right but it could be worse.  

I am convinced that the relative increase in watts from DL12 needs to be at least

18%.  The 10% we came up with in Washington was an off the cuff estimation that

did not take into consideration much higher primary winding losses due to more

air clearance between the low voltage and high voltage winding.  The proposed

efficiencies are certainly technologically feasible but they will tend to force

these products to better grades of steel than their lower BIl cousins to meet the

standards.  These levels will also make open‐dry types less competitive in this

area as compared to liquid and cast.  However, I did note that the 750 KVA and

above product have greater than 10% allowances making these levels not quite as

harsh.

Overall, I don't have any huge problems with the draft other than I wish we we

could get the losses up a bit for the higher BIL's but they are better than I

thought they would be compared to the lower BIL's from our last call.

I hope these comments will be helpful to the committee.  The attached spreadsheet

shows my checks of the numbers with log‐log and linear graphs included for a

visual representation.  I did not bother analyzing the 1‐phase since they did not

change.

(Nice Job Brian)

I am on vacation till 12/29 (Thurs) but I will try and make myself available to

the committee as needed.  My cell phone is 276‐791‐7064.

Rob Greeson

> 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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