ArresterNEWS  

A Monthly eNewsletter from ArresterWorks December 2008  

ArresterNEWS is a totally independent monthly e-journal dealing with system reliability and arresters. 

Understanding Arrester Discharge Voltage
or Residual Voltage to many
 

Bob Hileman

 The purpose of an arrester is to protect nearby equipment from overvoltage surges.  A large part of their effectiveness is measured by their Discharge Voltage.  Generally the lower the discharge voltage, the better the protection.  This month's ArresterFacts is all about this important characteristic of arresters.  What it really means, how to measure it, how it is related to inductance of the line and much more.  Let me know what you think and how I could improve this document. 
 
 

Understanding Discharge Voltage Cover Image

 

 

 

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Wanted
Info on Why Arresters are Grey 
  
For years I have used the color of arresters in the US as a means of estimating their age.  It is possible to at least determine if they are manufactured before or after 1965 using this method.  During the mid 60s, the color of most electrical products found on poles and in substations along US highways changed from brown to sky blue grey.
I was told as a young arrester designer that the arrester color change was a federal mandate that came out of "The Highway Beautification Act of 1965" , a brain child of "First Lady" Lady Bird Johnson.  .
While recently contemplating arrester color and its wholesale change in the 60s I decided to finally look for the actual mandate in the Highway Act for the clause that has been driving a design criteria for many years.
Well Guess What??
Nowhere does there appear to be a mandate for sky blue grey color on electrical equipment in US Law.
Does anyone have a hint about this?
Jonathan.Woodworth@ArresterWorks.com

 
 
New Short-Circuit Test Standard Published
 

Cover of IEEE C62.11a

Last month the IEEE standards department published C62.11a, an amendment to C62.11. This new amendment now specifies a short circuit test for all arresters.   What makes this amendment so unique is that it is virtually identical to the test procedure published in IEC 60099-4 in 2006. This similarity was purposeful and carefully orchestrated by common participants on both committees.   This is a first for arrester standards harmonization.  Though it will be many years before both standards are in complete harmony, this is a first step.

 Complete Overview of the new test requirements
 
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New Arrester Engineer in the Industry
Marco Morello  ABB-US 
Marco Morello
Marco Morello has joined ABB-US at their Youngswood, Pennsylvania facility as an arrester design engineer.  Marco received his B.S. in Mechanical Engineering with a Manufacturing Concentration from University of Pittsburgh in 1999.   Previously he worked 8 years as a Project Manager at Compunetics, Inc. manufacturing specialty printed circuit boards.  Welcome Marco to the arrester industry
 

Surge Protection Hall of Fame

 Asle Schei



Asle Schei
Engineer, Professor, Inventor and Founder of TransiNor
 
Asle Schei is a person known well in the IEC and CIGRE circles where he participated, lead and convened working groups for nearly 30 years. His most recent position in arrester standards was as Convenor of the now MT4 until 1995 which was responsible for all IEC medium and high voltage arrester standards of significance at that time. 
 
Because his career spanned so many accomplishments, it is difficult to point at one as his most significant, but the founding of TransiNor  along with two others entrepreneurs has to be close to the top of the list.  As the managing director of the business from 1986 to 1995, he led its effort to introduce a technically superior arrester condition monitor that is still on the market today.  The company specialized in transient analysis and related fields.  TransiNor was purchased by the Dobel Company in 2001.  
 
Professor Schei offers these "Words of Wisdom" to up and coming Engineers. "Engineers are very lucky people; their job leads them to very interesting problems especially when one must dig deep for the solution.  Also never be surprised when the outcome of an experiment is different from what you thought it would be. "

Complete Hall of Fame Citation

 

Suggestions for inductees are welcome.  Send to Jwoodworth@arresterworks.com
 
 
Distribution System
Overvoltage Protection Course Now Available
ArresterWorks is now available to visit your site to present 4-8 hour seminars on the protection of Distribution System Overvoltage Protection Seminars as well as Substation and Transmission Line