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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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Edirisinghe T Department of EE. Types of Lightening Ligytning Takes place when clouds are charged to a high potential Electrical discharge between a cloud and earth A huge spark Direct stroke Indirect stroke. From the line, current path may be over at the ground.

uxing The over voltage setup due to the stroke may be large enough to flashover this path directly to the ground. When cloud discharges to earth, -ve charge rushes along both directions in form of travelling wave.

Provides a low-impedance path for the lightning current to lessen the heating effect. This has 3 main parts.


The roof circuit Interconnection to grounding electrodes Grounding electrodes. Aim is to reduce the number of air terminals required by a traditional Franklin-type system. Reduce the overall cost of the protection system. Mainly in usibg categories. Systems that provide an increased zone of protection Systems that lightninb lightning strikes altogether.

Early streamer emission Radioactive rod systems Laser induced systems Charge transfer systems. Devices which capture the high voltage sparks resulting out of lightening. Can be applied for protection of distribution lines.


Induced over voltages can be counteracted by installing a single arrestor on an overhead line support. For direct lightening -arrestors are connected between poles and all the phase conductors in parallel with the insulators. 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. Semi conductive core 1 2 kightning. LFA-Ls help avoid both conductor burnouts and overhead power lines outages caused by lightning induced over voltages.

Extend the working life of high voltage circuit breakers. Protect electric networks against arc over voltages. Are not stressed by operational voltage and do not require maintenance. It protects from 0. Efficiency can only be increased by number of flash over modules.

  DWA101N-N 141 PDF

Long Flashover Arrester (LFA) Seminar Report

Electricity By Lauryn Jackson. How lightning is llghtning. Lighting is formed by: Unit 4 Ch Static electricity is the accumulation of excess electric charges on an object. Protection against Lightning Overvoltages Overvoltages due to lightning strokes can be avoided or minimized in practice by d shielding the overhead lines. Types of lightning II. For example world, us etc III.

Electricity Foundations of Physics. Electricity The movement of charge from one place to another Requires energy to move the charge Also requires conductors. Opposite charges attract, like repel Charged objects can cause electrons to rearrange their positions on a neutral object.

My presentations Profile Feedback Log out. Auth with social network: Registration Forgot your password? OK Rate of flow of electrical charge is called current P2 4. About project SlidePlayer Terms of Service. Feedback Privacy Policy Feedback.

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