ELECTROMAGNETIC FIELDS MANAGEMENT TECHNIQUES APPLICATION TO 500 KV TRANSMISSION LINES DESIGN

摘要

Electric and magnetic fields produced by high voltage transmission line have recently been added to the list of environmental agents that are a potential threat to public health, even available experimental evidence on possible human health effects from exposure to such fields is contradictory and inconclusive. There is now growing and persuasive evidence that under certain circumstances, power frequency field scan produce a variety of changes in the biological circumstances, power frequency fields can produce a variety of changes in the biological systems, which provide a growing basis for public concern. A number of alternative technologies are available to control human exposure to these fields. This paper performs an analysis to bound the region of appropriate designs as control strategies for electromagnetic field exposures for representative 500 kV transmission lines. The paper describes the design guidelines and various engineering techniques and practices for managing the electromagnetic field strength levels. Reducing the electromagnetic field strength is one of the many factors to be considered when planning, designing, construction or reconstruction of transmission systems. It should be considered along with other issues such as safety, reliability, environmental concerns, electrical clearance requirements, aesthetics, cost, operation and maintenance. Systematic comparisons of 25 different 500 kV transmission line designs electromagnetic field are presented. New design techniques, based on percentage field reduction, maintenance, and operational reliability are also described.