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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Automatically changes to Flash or non-Flash embed. It is designated as LFA-M.

Long Flashover Arrester (LFA) Seminar Report

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. Lightnning against Lightning Overvoltages Overvoltages due to lightning strokes can be avoided or minimized in practice by d shielding the overhead lines.

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 overvoltages and direct lightning strokes.

In the case, it is essential to coordinate the arrestors and the insulators on the lightning struck phase A.

The direct stroke can be of two types. Takes place when clouds are charged to a high potential Electrical discharge between a cloud and earth A huge spark Lightning is a huge spark that takes place when clouds are charged to a high potential with respect to earth object e. The general pattern is as follows. The 3-D password is a multifactor authentication scheme that combines these various authentication schemes into a single 3-D virtual The voltage rate of rise U l is proportional to steepness of the lightning current.


The result is that negative charge rushes along the line is both directions in the form of traveling wave. Both results put an. As a result probability of PAF for wooden structures is sufficiently lower than for steel or concrete supports. The arresters are connected between the pole and all of the phase conductors in parallel with the insulators.

Next, the insulators and arresters voltage-time characteristics VTCs are entered in an analytical form. To protect a line against induced over voltages; a single arrestor must be mounted on a pole.


A line with LFA arresters and INS insulators is shown to have a good lightning protection performance for direct lightning strokes. 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. The important feature protetion this modular long flashover arrester LFA-M is that it can be applied for lightning protection of overhead distribution line lighhning both induced overvoltages and direct lightning strokes.

Efficiency can only be increased by number of flash over modules.

Where n 0 is the number of lightning outages on an LFA protected line caused by direct lightning strokes on the phase conductors and P I lcr is probability of a lightning current with steepness greater or equal to I lcr. Blockchain Technology Seminar Report. It offers great number of technical and economical advantages.

Devices which capture the high voltage sparks resulting out of lightening.

Lightning Protection Using LFA-M | Seminar Report, PPT, PDF for ECE Students

Advertise on this site?? The presentation is successfully added In Your Favorites. Therefore, this new lightning protection system is thought to feature simple design, low cost, and high reliability.


The induced overvoltages can be counteracted by installing a single arrester on an overhead line support pole. It can be clearly seen that as the grounding resistance increases, the critical lightning current steepness I l l ,cr decreases. Phase-to-phase faults on a pole can give rise to fault current in order of a few kiloampers. Modules1 and 3 flashover first, followed by module 2 ,and thus, forming a rather long flashover channel along the LFA. There are three clouds P,Q and R having positive, negative and positive charge respectively.

Seminar for you: Lighting protection using LFA-M

Time is incremented in equal steps D t. For direct lightening -arrestors are connected between poles and all the phase conductors in parallel with the insulators. Electricity Foundations of Physics. If a positively charged cloud is above the line and induces a negative charge on the line by electrostatic induction. Lighting is formed by: A long flashover arrester LFAwhich comprises of three flashover modules using the creeping discharge effect, is described in this paper.

Don’t enter email or mobile uaing. Systems that provide an increased zone of protection Systems that eliminate lightning strikes altogether. The LFA-M described here consists of three flashover modules. How does LFA-M protect the overhead lines?: