Arresters for application at 52 kV and higher have experienced the same fundamental shifts in technologies as distribution arresters but at a slower pace. In the 10 year period between 1986 and 1996, the distribution arrester market converted almost entirely away from porcelain. However, since their first appearance in the early 1990s, polymeric-housed...
The National Electrical Safety Code (NESC, IEEE C2-2012) specifies horizontal and vertical clearances of unguarded parts and clearance between guard to live parts on EHV power systems (345 kV and higher). Basic clearances are specified, which can be adjusted... Read More
For years I’ve been arguing that arresters do not fail from lightning – period. But that view has changed now that my partner, Deborah, convinced me to re-consider how I approach the issue. Her argument: if a surge arrester has already degraded due to... Read More
Power system engineers all face a similar dilemma at one time or other when trying to identify which product offers the quality they require – especially in today’s global market with its many competing suppliers. Yet making the right decision can prove... Read More
Application of gapped (EGLAs) or non-gapped (NGLAs) transmission line arresters offers perhaps the best opportunity for power engineers to improve system reliability. However, the real value of using these TLSAs transcends this one objective alone. There are... Read More
There are a number of effective ways to test an arrester in the field without necessarily having to rely on sophisticated equipment. This INMR article contributed by arrester specialist, Jonathan Woodworth discussed using an AC or DC Hipot, or dielectric... Read More
The term wildlife protective device is relatively new to the power industry and refers to any device used on the network to reduce outages due to the impact of wildlife. Other terms sometimes used to describe these devices include animal guards, bird guards,... Read More
Lightning protection is usually associated mainly with distribution networks or transmission lines and substations. However, another area in the electricity supply paradigm where application of arresters needs to be considered are relatively small power... Read More