Summary of Transient Data Obtained from Long-Term Monitoring of a 138-KV and a 500-KV Transmission Line

This paper presents a summary of transient data obtained during the monitoring of voltages and currents for a 138-kV and a 500-kV transmission line. The 341 transient events recorded during staged tests and unattended operation are grouped into three classes???lightning, switching, and fault. Significant examples are discussed in detail, and sample waveforms are presented. A description of the laboratories used to make the measurements is included in a companion paper. This work was sponsored by the Electric Power Research Institute under Contract RP751-1.