From: Kenneth Winder [mailto:kwinder@mleainc.com] 

Sent: Thursday, September 22, 2011 7:36 PM 

To: Rosenstock, Steven 

Cc: Richard Parker; Corkran, Jerry L; Caitlin Johnson; rick.anderson@faypwc.com; 

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Michael T; Poole, Raymond L; Moore, Jack C; Smith, Jennifer 

Subject: Re: Distribution Transformers Committee requested areas for the DOE to Investigate before 

final rules are selected. 

On 9/22/2011 5:11 PM, Kenneth Winder wrote: 

Mr. Parker and others, 

Below are comments for the modeling, studies and considerations to help in this negotiated 

Rulemaking process. 

Comments about the effects of transformer loading on a distribution pole: A statement of 

record was made in the September Rulemaking Committee meeting that vertical weight on a pole 

(from a transformer) can be ignored. 

I believe this is incorrect and have found some engineering data and calculations concerning the 

effects of the application of transformers as a transverse and vertical load on a pole. It sets forth 

the calculation methods of the forces involved and eventually arrives at allowable loads that can 

be attached to a distribution pole of various heights and classes. The work shown and 

conclusions reached in that paper need to be modified to represent an amorphous core 

transformer since that type of transformer is larger physically and is offset further from the pole 

than the calculations found, they need to be recalculated for the amorphous transformer 

application. 

I believe this information should become part of the public record. I need to look further into 

any copyright on the information before it can be sent to the group. 

Comments about Amorphous core transformers: We have reviewed the failure of pole-mounted 

amorphous core transformers over a twenty year period for our utility. We purchased over 1,700 

of them during the early to mid-1990's. We have looked at the amorphous transformers 

purchased compared to those that are still in service (includes those that are on the warehouse 

docks and in the field). We have tried to similarly compare the same for steel-core transformers. 
Failure rates appear to differ significantly (higher for Amorphous core units). Is this represented 

properly in the DOE/Navigant model? 

Kenneth A. Winder 

Moon Lake Electric Assn., Inc.