1. Harmonic Distortion on the CHESF Transmission Grid Caused by: –TV Receivers) Harmonic Distortion Measurements - 230kV Substation - During World Cup Soccer Game Fortaleza, Brazil, June 12, 1986 Brazil 3 X 0 Ireland Measurement Point The World Cup Soccer and Harmonic Distortion Paulo F Ribeiro

2. Summary of the Measurements 5 th Harmonic Voltage – 230kV Bus Match Time

3. Voltage at the 230kV - Detail of 13.2kV Residential Feeder Disconnection (before the beginning of the match) Clearly indicates the origin the harmonic source / contribution to the 5 th harmonic distortion on the 230kV bus. Led to Flexibility and Higher Tolerance 7 th Harmonic