Protection of Locos Against Lightening Surges:
1) The direct lightning strokes may strike on the overhead conductor on the roof of the locomotive.
2) To protect the locomotive from lightning strokes lightning arrester 1 (LA1) is provided it is generally a Rod gap type having the gap length of 210mm.
3) The lightning arrester provides a low resistance path for high voltages and high resistance path for normal power frequency working voltages. The lightning stroke is thus diverted towards earth via lightning arrester.
4) The transformer is critical and costly equipment hence lightning arrester 2 (LA2) is provided along with LA1.The gap of LA2 is 70mm so that its operation time is less..
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