LIGHTNING PROTECTION USING LFA-M PDF

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

LIGHTENING PROTECTION USING LFA-M – ppt video online download

The shielding failure of usinh outer phases is reduced and it is given by the following equation. A new simple, effective and inexpensive method for lightning protection of medium voltage overhead distribution line is using long flashover arresters LFA.

Semiconductive core of upper piece, whose resistance is R ,applies the high potential U to the surface of the lower piece at its middle. If the cloud P shift too lightnign to cloud Q,Then lightning discharge will occur between them and charges on both these cloud disappear quickly.

LIGHTNING PROTECTION USING LFA-M

For a lightning stoke on a phase conductor, the lighting current propagates both ways from the stroke point overcoming the surge impedance Z s of the line. The roof circuit Interconnection to grounding electrodes Grounding electrodes. A new long flashover arrester model has usimg developed. Seminar Report on Plastic Roads. The effect of the power frequency voltage of a kV line on discharge process on the arrester surface is negligible.

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Charge on the cloud Q is bound by prptection R.

For the protection of lines against direct lightning strokes, the livhtning are connected between the poles and all of the phase conductors in parallel with the insulators. Plastic Roads Disposal of waste plastic is a major problem. 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.

An LFA-M arrester consists of two cables like pieces. From the line, current path may be over the insulators down to the pole to the ground.

Lightning Protection Using LFA (Lightning Frequency Arrester)

Equation A4 of the Appendix is used to find the rate of propagation of discharge channels in modules 1 and 3 of arrester LFA A and the distance covered by these channels over time D t.

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

For direct lightening -arrestors are connected between poles and all the phase conductors in parallel with the insulators. Lightning is a huge spark and that take place when clouds are charged to at a high potential with respect to earth object e.

For the protection of lines against direct lightning strokes, usijg arresters are connected between the poles and all of the phase conductors in parallel with the insulators. For example world, us etc III. Semiconductive core of upper piece, whose resistance is R ,applies the high potential U to the surface of the lower piece at its middle.

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Published by Sherman Lindsey Modified over 2 years ago. As tests have shown, module 3 of phase a arrester will usually flash over after module 1. Similarly, lightnjng semiconducting core of the lower piece of the same resistance applies the low potential 0 to the surface of the upper piece, also at its center.

The cable pieces are arranged so as to form three flashover modules 1,2,3 as shown in figure1. It was assumed to be equal to zero. Majority of the surges in a transmission lines are caused by indirect lightning stroke.

The lf-am of PAF sharply decreases with a decrease in E. Direct stroke Indirect stroke. The direct lightning performance of the modular arresters was carried out using the equivalent circuits of fig 4. Protection against Lightning Overvoltages Overvoltages due to lightning strokes can be avoided or minimized in practice by d shielding the overhead lines.

As seen in fig 3. 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. Thank you for providing the great information on a Lightning Protection System The pictorial representation is very helpful for every new user.

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