(INMR, Vol. 16, No. 2, Issue-80, 2008, p 50)
The externally gapped line arrester (EGLA) optimizes the positive characteristics of the oldest arrester design component - a series gap - and the newest arrester design component, namely the metal oxide varistor (MOV). Combining these two yields a significant improvement in line protection and reliability options for electric utilities. However due to the negative characteristics of gapped technology when used in series with earlier silicon carbide (SiC) arresters, the EGLA sometimes experiences problems with acceptance.
This article, contributed by Jonathan Woodworth, aims to clarify the differences between the two alternative line arrester technologies and to outline the fundamental characteristics that make this design attractive for so many line protection applications.
