The Problem of Short-circuit Current Limitation in Energy–saving Systems of Transportation and Electricity Distribution

The article shows the inextricability of the problem of creating technologies for energy-saving systems of transportation and distribution of electricity, the development of technologies of Smart Grid, with the problem of limiting short-circuit currents and specific requirements for current-limiting devices. Specific recommendations on the rational choice of current-limiting can be given on the basis of their comparative analysis, classification, determination of advantages, etc. It has been found that the use of traditional current-limiting devices (high-speed fuses, circuit breakers) for the designed and newly developed low voltage energy-saving electricity transport systems does not provide a limitation of short-circuit currents to the required level. It is necessary to overestimate the nominal parameters of the elements of power supply systems to increase their resistance to short-circuit currents. This is due to the forced increase in the metal consumption of networks, the use of complicated designs of electrical devices, and an increase in the investment component in electric networks. Intensification of work towards the development of new current-limiting devices, obtaining practical results will clarify the scope of each of the current-limiting devices in power supply systems.