The article describes the effects of operating frequency reduction on the transmission behaviour of high power cables. Strongly reduced current losses, lowered induced voltages in the sheaths and lower charging currents offer new solutions for the transmission of energy by cables. The following facts can be obtained by reduction of the operating frequency: an increase of the current carrying capacity, an enlargement of the transmission distance, lower thermal stress of the cable and better ef3ciency of the power transmission. The above mentioned advantages are typical for direct current (d.c.) transmission systems, but can now also be achieved for usual alternating current (a.c.) cables by reduction of the operating frequency. The positive effects of frequency reduction are represented for four different types of power cables.
The article describes the effects of operating frequency reduction on the transmission behaviour qf steel pipe cables. In many countries the external/internal gas pressure cables as well as the oilostatic cables are of a greater interest. Retrofitting of such cables is done by exchanging the old cable cores by new cores with synthetic (e.g. XLPE-) insulations, thus building so-called "city cables". Possible effects of a frequency reduction on the current ratings and losses of external gas pressure cables as well as of city-cables are discussed. Furthermore the citycable is compared with a superconducting cable.
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