A NEW LIGHTNING PROTECTION SOLUTION FOR DISTRIBUTION LINES

Abstract

Most of the overhead power distribution lines are exposed to the outdoor
weather, failures are usually caused by weather conditions, in incidents the failure
rate caused by lightning is about 60 - 65%. Therefore, the task of the design and
operation of distribution lines is to find solutions to reduce the failure caused by
lightning. This paper presents the results of research on a new method for lightning
protection for 110kV overhead distribution lines by using the additional underbuilt
shield wires. This would not only reduces the fault caused by lightning, but also
partially reduces the lightning current flowing through the grounding system of
tower. The results are performed by the EMTP/ATP electromagnetic transient
program and the calculations are based on IEEE std. 1410-2010. The voltage coupling
coefficient and lightning shear rate of the line caused by lightning are evaluated. The
influence of the number and placement location of installation of the shielding wire
below the phase wires below have been analyzed.