Avaliação do ruído de rádio interferência proveniente de linha de transmissão de 500 kV

Abstract

The present work deals with measurements and calculations of radio interference (RI) generated by high voltage transmission lines due to corona. Measurements were performed in the vicinity of a 500 kV, single-circuit transmission line with the conductors horizontally disposed.The measurement procedures are presented in details and the presented results correspond to the first RI results published in Minas Gerais state. After the theoretical RI calculations are presented, the measurement procedure and results are discussed. Initially, the background noise at the vicinity of the line was measured with a loop type antenna connected to a RI meter. Later the antenna was centered underneath the line cables to start the measurements. A comparative analysis of the differences between the calculated and the measuredRI values is presented. The results show good agreement, being better for points located far to the line; it also showed good agreement with those presented in the literature.