Externally gapped line arrester 3EV4, external series spark gap, transmission-line duty, IEC 60099-8
3EV4
- External series spark gap galvanically isolates the metal-oxide active part from line voltage under normal service conditions — no leakage current and no continuous energisation
- On a lightning strike the gap flashes over; the arrester limits the ground-fault current from several kA to a few amperes and the arc extinguishes within 10 ms, so no circuit-breaker reclosing operation is needed
- No disconnector and no ground lead required; highly compact design suited to multi-circuit towers with very small cross-arm clearances, and better suited for live installation
- Series gap insulates the varistor unit, so a lower arrester rated voltage and fewer MO blocks suffice than in a non-gapped (NGLA) design; complete EGLA solutions with polymer insulators are also available
- Designed and tested to the latest IEC 60099-8; part of a line-surge-arrester portfolio covering system voltages up to 800 kV with 3.6 C energy discharge capability
- Optional Cigré-based line simulation service determines the optimum number and placement of arresters along the line; detailed 3EV4 ratings and dimension drawings available on request
Lightning protection of overhead transmission linesReduction of double-circuit outage rates on multi-circuit towersLine upgrading and compaction through reduced insulation levelsLive-line work — temporarily reduced minimum approach distanceImproved reliability on lines with poor grounding and high lightning activity
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Specifications
Documents & downloads
Flyer Line surge arresters for increased system reliability (NGLA & EGLA)
Datasheet 3EV4 EGLA ratings and dimension drawings — available on request
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