The measurement of lightning voltages and currents in South Africa and Nigeria¿1935 to 1937

The paper gives an account of an investigation into the magnitude of lightning voltages and currents measured on power transmission lines. The research was undertaken primarily in South Africa, on a 40-kV power line of the Victoria Falls and Transvaal Power Co. Later the work was continued in Nigeria on a 33-kV line of the Nigerian Electricity Supply Corporation´s system. The apparatus used in the investigation comprised (a) a high-speed continuously-evacuated cathode-ray oscillograph, (b) a klydonograph, and (c) magnetic links for current measurement. The results obtained are analysed and compared with similar measurements made in other parts of the world.