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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The probability of PAF sharply decreases with a decrease in E.
Extend the working life of high voltage circuit breakers. The rate of channel propagation on arrester modules is determined, and the modules are checked for flashovers. First, a lightning impulse causes a spark over of the spark gaps Next, the semiconducting core of the upper cable piece, whose resistancecarries the high potential to the surface of the lower piece at its middle. An LFA-M arrester consists of two cables like pieces.
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Long Flashover Arrester (LFA) Seminar Report
This assures uninterrupted power supply of a LFA protected over head line. Its resistors assure application of the total arrestor-stressing voltage simultaneously to all the modules.
From lf-am line, current path may be over the insulators down to the pole to the ground. Lightning is a huge ligntning and that take place when clouds are charged to at a high potential with respect to earth object e. It protects from 0. After the LFA A fully flashed over, the lightning current travels through the pole and its footing. There are two main ways in which the lightning may strike the power system.
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This has 3 main parts. The pole does not get involved in the path of the lightning current until the insulator or the arrestors have flashed over. Edirisinghe T Department of EE.
Tests have been shown that, as the line conductor is stressed by lightning over voltage impulse, flash over channel develop at different rates. A new simple, effective and inexpensive method for lightning protection of medium voltage overhead distribution line is using long flashover arresters LFA. The number of lightning outages n o caused by direct lightning strokes DLS on conductors of lihhtning unprotected line can be estimated by the following equation.
If a positively charged cloud is above the line and induces a negative charge on the line by electrostatic induction. As illustration, let us consider the operation of phase A arrester. Therefore, this arrester should be relatively short. As seen in fig 3.
Lightning Protection Using LFA-M | Seminar Report, PPT, PDF for ECE Students
When the potential between the cloud and line exceed the breakdown value of air, the lightning discharge occurs between the cloud and the line. Lightning is an electrical discharge between cloud and the earth, between clouds or between the charge centers of the same cloud. The cloud will induce a charge of opposite sign on the tall object. With the INS insulators the number of lightning outages is lowered by a factor of five, the outage reduction factor K DLS being practically independent of the grounding resistance.
The cable pieces are arranged so as to form three flashover modules 1,2,3 as shown in figure1. lightnng
Thank you 5 months protsction. A new long flashover arrester model has been developed. It should also be remembered that even large lightning currents do not present any hazards to these arrestors because the discharge develops in the air and not inside the device.
LIGHTENING PROTECTION USING LFA-M
It was found that the main factor, which determines the probability of PAF, is the mean gradient of operational voltage along the flashover path. Lightning is a huge spark and that take place when clouds are charged to at a high potential with respect to earth object e. In stroke B the lightning discharge occurs on the overhead line ljghtning the result of stroke A between the clouds. Auth with social network: The rate of decrease of the critical gradient slows down for larger fault currents.
The LFA-M described here consists of three flashover modules.