Live Line Insulators

66kV to 800kV

For suspension and tension applications our insulators features an ECR Glass (boron-free) FRP rod, designed for resistance to brittle fracture, hydrolysis, and acids. It is paired with HTV silicone rubber, which incorporates a hydrophobicity transfer mechanism to ensure optimal performance in high-pollution environments.

Additionally, it can be supplied with line hardware and line surge arresters, as outlined below.

Externally Gapped Line Arrester (EGLA)

132 to 500kV Insulated from the high-voltage line by series gap

Siemens Energy's EGLA line surge arresters incorporate an external spark gap arranged in series to provide galvanic isolation between the active section of the surge arrester and the line voltage during normal operational conditions.

During a lightning event, the spark gap activates, allowing the arrester to limit the ground fault current from several kiloamperes down to just a few amperes.

This rapid response extinguishes any arcs within 10 milliseconds, eliminating the need for circuit breaker operations at both ends of the line, effectively preventing reclosing operations.

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Non-Gapped Line Arrester (NGLA) 

132 to 500kV Direct Connection to Overhead Line

Siemens Energy's Non-gapped line surge arresters (NGLA) provide exceptional mounting versatility and operational reliability. Depending on the tower's configuration and the positioning of insulators and power lines, these arresters can be directly affixed to either the insulators or the tower structure. NGLAs effectively limit overvoltages to levels well below the withstand voltage of insulators.

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