Externally Gapped Line Arresters Air Insulated Switchgear

Product Description

EGLA line surge arresters have an external sparkgap placed in series that galvanically isolates the active part of the arresterfrom the line voltage in normal conditions. In case of lightning, the spark gapis ignited and the overvoltage is safely discharged to the ground. EGLA linesurge arresters prevent all insulator flashovers caused by lightning strikes.As such, EGLA increases network stability as well as the availability of theoverhead line.

An additional benefit of EGLA line surge arresters is that there is no leakagecurrent, because the series gap disconnects the active part of the EGLA fromthe system voltage.

This compact design is often the only option to install line surge protectorson existing towers with very small clearances.
 

Siemens EGLA line surge arresters are available forsystem voltages of up to 550 kV.