WELCOME LIGHTNING PROTECTION USING LFA-M Submitted By:Somi.P. Chacko Class: S7-EEE Roll no: MCET CONTENTS. Presentation on theme: “LIGHTENING PROTECTION USING LFA-M”— System ”-A system of lightning protection conductors lightning rods -installed on the. effective and inexpensive method for lightning protection of medium voltage overhead distribution line is using long flashover arresters (LFA).

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A new simple, effective and inexpensive method for lightning protection of medium voltage overhead distribution line is using long flashover arresters LFA. A new long flashover arrester model has been developed.

It is designated as LFA-M. It offers great number of technical and economical advantages.


The important feature of this modular long flashover arrester LFA-M is that it can be applied for lightning protection of overhead distribution line against both induced over voltage and direct lightning strokes. The induced over voltages can be counteracted by installing a single arrester on an overhead line support pole. For the protection of lines against direct lightning strokes, the arresters are connected between the poles and all of the phase conductors in parallel with the insulators.


Lightning is an electrical discharge between cloud and the earth, between clouds or between the charge centers of the same cloud.

Long Flashover Arrester (LFA) Seminar Report

Lightning is a huge spark and that take place when clouds are charged to at a high potential with respect to earth object e. An LFA-M arrester lightnimg of two cables like pieces.

Each cable piece has a semi conductive core of resistance R. The cable pieces are arranged so as to form three flashover modules 1,2,3 as shown in lva-m.

Semiconductive core of upper piece, whose resistance is R ,applies the high potential U to the surface of the lower piece at its middle. Therefore the total voltage U is applied to uaing flashover module at the same moment, and all three modules are assured conditions for simultaneous initiation of creeping discharges developing in to a single long flashover channel.

LIGHTENING PROTECTION USING LFA-M – ppt video online download

Tests have been shown that, as the line conductor is stressed by lightning over voltage impulse, flash over channel develop at different rates. Modules1 and 3 flashover first, followed by module 2 ,and thus, forming a rather long flashover channel along the LFA. Due to long flashover path, a flashover does not give rise to a power arc as the arc extinguishes when the power frequency current crosses zero.


This assures uninterrupted power supply of a LFA protected over head line.

Thank you 5 months ago. Nice seminar on Lightning Protection. Vitthal Patnecha 13 January Don’t enter email or mobile no.