Explore Lightning Protection Using LFA-M with Free Download of Seminar Report and PPT in PDF and DOC Format. Also Explore the Seminar Topics Paper on. 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. Presentation on theme: “LIGHTENING PROTECTION USING LFA-M”— System ”-A system of lightning protection conductors lightning rods -installed on the.

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The direct stroke can be of lihgtning types. It offers great number of technical and economical advantages. In stroke B the lightning discharge occurs on the lightning protection using lfa-m line as the result of stroke A between the clouds.

It offers great number of technical and economical advantages. Lightning protection using lfa-m calculation is carried out for a linear increase of the lightning current, that is. Auth with social network: The result is that charge on llfa-m R suddenly become free and it then discharges rapidly to earth, ignoring tall object.

The induced over voltages can be counteracted by installing a single arrester on an overhead line support pole.


The calculation is restarted lightnihg a lightning protection using lfa-m time step D t. How does LFA-M protect the overhead lines? The over voltage set up due to the stroke may be large enough to flashover this path directly to the ground. The probability of PAF sharply decreases with a decrease in E. Some results of published experimental studies on the critical gradient are shown in fig3. WordPress Embed Customize Embed.

A new simple, effective and inexpensive method for lightning protection of medium voltage overhead distribution line is using long flashover arresters LFA. Automatically changes to Flash or non-Flash embed. The roof circuit Interconnection to grounding lightning protection using lfa-m Grounding electrodes. This assures uninterrupted power supply of a LFA protected over head line.


The suggested LFA accomplishes this principle. Each cable piece has a semi conductive core of resistance R. 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.

Vitthal Patnecha 13 January It follows from the previously described sequence of events that direct lightning stroke causes flashover of all the insulators on the affected pole. As indicated before, the coordination of arrester LFA A is not depend on the grounding lightning protection using lfa-m because The pole does not get involved in the path of the lightning current until the insulator or the arrestors have flashed over.

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LIGHTENING PROTECTION USING LFA-M – ppt video online download

Usimg direct stroke can be of two types 1. Therefore the total voltage U is applied to each flashover module at the same moment, and all three modules are lightnijg conditions for simultaneous initiation of creeping discharges developing in to a single long flashover channel.

Lighting is formed by: Due to a special inner structure the LFA impulse flashover voltage is lower than that of the insulator and when subjected to lightning overvoltage the LFA will flashover before the insulator. You do not have prorection permission to view this presentation. It assured reliable protection of medium voltage e. It was found that the main factor, which determines the probability of PAF, is the mean gradient of operational voltage along the flashover path.

Go to Application Have a question? First, the line parameters are entered, including the arrangement and radius of the conductors, the pole height, the grounding resistance, etc. Nice seminar on Lightning Protection. LFA-Ls help avoid both conductor burnouts and overhead power lines outages caused by lightning induced over voltages. The rate of decrease of the critical gradient slows down for larger fault currents. Before flash over, the total protectio of the arrester can be assumed to be infinitely lightning protection using lfa-m.


The voltage-time characteristics of the arresters lightning protection using lfa-m insulators can be approximated by the lfaa-m. From the line, current path may be over the insulators down to the pole to the ground.

In stroke A, the lightning discharge is from the cloud to the subject equipment e. After a top phase LFA flashes over, lightning current lightning protection using lfa-m flow, through the affected conductor and through the pole to the ground.

To make this website work, we log user data and share it with processors. Published by Sherman Lindsey Modified over 2 years ago. If a positively charged cloud is above the line and induces a negative charge on the line by electrostatic induction.

The cloud will induce a charge of opposite sign on the tall object. From the line, current path may be over the insulators down to the pole to the ground. Direct stroke Lightning protection using lfa-m stroke.

Semi conductive core 1 2 3. It is designated as LFA-M. How lightning is formed.