Electric Field Reduction of Kuwait Transmission Systems using Natural Trees

H.M. Ismail and A.M. Al-Kandari (Kuwait)


Transmission lines, Electric field reduction, Natural trees, Charge simulation method.


A very important part of the overall characteristics of high voltage transmission lines (HVTLs) is their dangerous electric field effects which can be reduced by reducing the magnitudes of the these fields. In this paper, a row of natural trees is used to shield a span of very HVTLs to reduce the electric field around and, in turn, to reduce the edge of right-of-way (R.O.W) limits. The lines considered for the study are multiphase multiconductor transmission lines. The row of trees is approximated by a grounded cylinder parallel to the line. The effect of tree type is taken into consideration through the change of its height and equivalent radius. Proximity of trees row to the line and its influence on the limits of R.O.W is examined and clarified. The analysis of two 3-phase, 275 kV, double circuit, bundle conductors TLs adjacent to each other and running in parallel using this method of shielding is also conducted. Graphs of electric field distribution at 1-m height above ground surface level for different design parameters of the cylinder are presented for a simple evaluation of the R.O.W limits at any maximum allowable electric field stress at the edge of R.O.W. The charge simulation method (CSM) is used to model the above mentioned systems with a great accuracy.

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