Abstract
Abstract Results of measurement of higher harmonic currents using a device for measuring telluric currents with a limiting registration bandwidth of 250 kHz are presented. A four-channel 18-bit analog-to-digital converter with a sampling rate of 500 000 Hz (1 count per 2 μs) is used to digitize information. On the stand created on the basis of the developed device, industrial frequency currents flowing along the ground were recorded. Dynamic spectrograms of current harmonics in the static mode and when switching loads of electricity consumers were recorded. It is shown that increased levels of high-frequency interference are recorded at frequencies of 60 kHz and above. The possibility of developing a special device for continuous monitoring of the levels of high-frequency harmonics of currents flowing through the neutral without direct connection of the measuring device to the power-supply equipment is shown.