Reduction of Energisation Overvoltages on Caele/Overhead-Line Systems Using Shunt Reactive Compensation.(Dept.E)

Mansour Hassan Abdel-Wahab,Reda El-Dewieny

doi:10.21608/bfemu.2021.182074

Abstract

The waveshapes and magnitudes of overvoltages produced by the energisation of cable/line transmission systems depend on the relative position of the cable and the overhead line with respect to the energising source as well as, on the value of the source inductance. The effects of these two factors are investigated using a computer program on a three-phase basis. Under some circumstances, the overvoltages produced may be far more severe than those produced in transmission circuits consisting of overhead lines alone. The use of shunt-reactive compensation has proved to be advantageous, particularly in these cases where a cable/line system is being energised from a highly-inductive source. Moreover, it is found that the reduction in overvoltages is further increased for the same compensation value, when shunt reactors are distributed at both ends of the transmission system than when they are concentrated at one end only.

Highlights

The va.ve,ha:pes an1 ;,agnitue9S of owrvoUages proc.uced by the eMr~i sat ion of cable/line transmission systems d~nd on the relative position ot the cable and the overhead line ~ith respect to the energ131ng Bource as vell &a, on the value of the aouree inductance
Tbe effects of theae two fac'l.ore are Inveetigated using a computer program on a t~ee-~e basie. tinder some circ1.lJ!IStancea! the overvo':' berea proc
~asically determined by overvoltages that may occur on the 6y&tem~ especially those caused ty energisation operatione

Summary

Introduction

The va.ve,ha:pes an1 ;,-,agnitue9S of owrvoUages proc.uced by the eMr~i sat ion of cable/line transmission systems d~nd on the relative position ot the cable and the overhead line ~ith respect to the energ131ng Bource as vell &a, on the value of the aouree inductance. The use of shunt-reactive compen5aticn has proved to be advantageous, in th.ae cases ~here a cable/line system i5 being .nergised [ro= a highly-inductive source. Thr.e~ph$ee $Yetema are considered and the effect of varying source-inductance value cn these OVf!T"YCl ta.gee is aleo inveatigated.

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Results

Conclusion