Frequency Analysis and Distance Dependence of Transient Earth Voltage Signals from Partial Discharge Sources

Frequency and propagation time analyses of the TEV signals were carried out for various distances from patrial discharge source. It was found that the signal immediately after propagation to the TEV sensor contained a high frequency component of 200～300 MHz. Propagation time became slower by increasing distance, and its velocity was close to the velocity of light. Also, this signal intensity reduced with increasing distance.