Woodworth on Arresters
What’s Next After Succession of Different Arrester ‘Eras’?
Like many other things, the surge arrester was born of necessity. But while most might guess that arresters were introduced around the late 1800s when power lines first entered operation, they actually appeared 50 years earlier. Their initial function, in fact, was to protect not power lines but early telegraph lines. In North America, the ...Read More
Energy Ratings of Distribution Arresters
“What is the kJ/kV Uc rating of a Class 1, 10 kA arrester? This type of question has often been asked when it comes to distribution arresters. Yet finding an answer has not been easy since these arresters (formerly referred to as Class 1) never had energy... Read More
IEC Standards for Arresters: Now & In the Future
Harmonization As a long-time member and contributor to both IEC and IEEE, I feel that there is now excellent collaboration among those involved in setting standards for surge arresters. Sill, while both IEC and IEEE arrester Working Groups have been trying to... Read More
Do Your Station Class Arresters Have Adequate Fault Current Withstand Capability?
Station class arresters since 1980 have typically been based around various types of metal oxide varistors. Despite having been designed to withstand most power system surges, it’s still possible for these varistors to become overloaded or fail such that... Read More
Understanding Energy Rating of Distribution Arresters
ERRATUM: The Qtr 2, 2016 issue of INMR is now on its way to subscribers but contains an error in the column Woodworth on Arresters. That error is corrected below, in red. INMR and Jon Woodworth regret any inconvenience caused by this error. “What is the... Read More
Superior Choice to Shield Wire for Transmission Lines
A past conference on power system design included a thought-provoking presentation where the speaker challenged attendees, and especially the next generation of transmission line engineers, to build lines with more emphasis on ‘sustainability’. The... Read More