We supply non-gapped and externally gapped line surge arresters for overhead lines for up to 800 kV. Line surge arresters offer the most economical and effective lightning protection on new and existing overhead line systems. Special areas of application include e.g. areas with high lightning frequency, poor soil or tower grounding resistance (e.g. for sandy or rocky ground), unprotected overhead lines (without ground wire), reducing switching impulse current overvoltages in high-voltage systems, and providing extended station protection.
Overview of our line surge arresters
We offer line surge arresters for system voltages of 12 kV to 800 kV. Siemens line surge arresters can be directly installed without an external spark gap (NGLA, non-gapped line arrester) or with an external spark gap (EGLA, externally gapped line arrester).
Non-gapped line arresters (NGLA) – line surge arresters without spark gap
Non-gapped line surge arresters (NGLA) offer a high degree of mounting flexibility and operational reliability. Depending on the tower design and the arrangement of insulators and lines, these arresters can either be installed directly on the insulators or on the tower.
Thanks to their high energy absorption capacity, non-gapped line arresters offer a very high level of protection against overvoltages caused by lightning and network-generated switching impulse current overvoltages.
To galvanically isolate the line surge arrester from the line voltage in the unlikely event of a fault or thermal overload, a disconnector is installed in series. It automatically and immediately disconnects the line surge arrester from the line voltage.