Hiroji Matsubara

Analytical and experimental study on surge response of transmission tower

This paper describes analytical and experimental studies on tower surge response, including effects of return stroke current. Such effects have been ignored in previous lightning surge analyzes of transmission towers. A new method for calculating transmission tower surge response including the effects of return stroke current is proposed. The proposed method is based on the electromagnetic field theory, and it clearly shows that the tower surge response depends on the direction and velocity of the return stroke current. The tower surge response calculated by the proposed method agrees well with the measured tower surge response obtained from scale model tests and field tests.

Fault Surges on HVDC Transmission Lines in Both Bipolar Operation and Monopolar Metalic Return Operation Modes and Comparison with Field Test Results

The analysis of abnormal overvoltages caused by line-to-ground faults are important for the insulation design on the HVDC transmission system.

Modified Field Test on Fault Surge and Simulation of This Test with A Transient Network Analyzer

This paper describes the results of a field test which simulated a fault surge. The test provided information on magnitudes, waveforms and significant phenomena relating to fault surges. A TNA test which simulated the field test indicated that a TNA provided reliable results.