On the Distribution of Lightning Current among Interconnected Grounding Systems in Medium Voltage Grids

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شرح پروژه

This paper presents the results of a first investigation on the effects of lightning stroke

on medium voltage installations’ grounding systems, interconnected with the metal shields of the

Medium Voltage (MV) distribution grid cables or with bare buried copper ropes. The study enables

us to evaluate the distribution of the lightning current among interconnected ground electrodes in

order to estimate if the interconnection, usually created to reduce ground potential rise during a

single-line-to-ground fault, can give place to dangerous situations far from the installation hit by the

lightning stroke. Four different case studies of direct lightning stroke are presented and discussed:

(1) two secondary substations interconnected by the cables’ shields; (2) two secondary substations

interconnected by a bare buried conductor; (3) a high voltage/medium voltage station connected

with a secondary substation by the medium voltage cables’ shields; (4) a high voltage/medium

voltage station connected with a secondary substation by a bare buried conductor. The results of the

simulations show that a higher peak-lowering action on the lighting-stroke current occurs due to the

use of bare conductors as interconnection elements in comparison to the cables’ shields.

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