Abstract

The increasing use of underbuilt lines in recent transmission projects alters electric field profile under transmission lines. By assessing electric field intensity in these transmission and distribution network configurations, the study identifies regions with high electric fields that may exceed standard exposure limits, posing potential risks. This work employs the charge simulation method and the method of imaging to analyze electric fields beneath transmission lines with underbuilt distribution networks. Key objectives include calculating the electric fields at 1 meter above ground, and evaluating the field at conductor surfaces. The study considers transmission line voltages of 69kV, 161kV, 220kV, 345kV and 500kV and distribution line voltages of 12.47kV, 24.9kV, and 34.5kV. The electric field is calculated when underbuild distribution line is energized and when it is de energized and grounded. The study also examines the impact of varying distribution line heights and multiple distribution lines on electric field intensity. Results reveal changes in field profiles and reductions in electric field intensity when underbuilt distribution lines are present beneath high-voltage (HV) transmission lines. The surface electric field on HVTL conductors increases with the presence of energized underbuild distribution circuit. The findings highlight the effectiveness of the charge simulation technique and method of imaging in analyzing electric field effects and emphasize the importance of incorporating underbuilt distribution lines in HV transmission design.

Date of publication

Spring 4-9-2025

Document Type

Thesis

Language

english

Persistent identifier

http://hdl.handle.net/10950/4851

Committee members

Hassan El-Kishky, Professor, Ali Ghorshi, Ph.D., Fatemeh Kalantari PHD.

Degree

Masters in Electrical Engineering

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