Development of a Method of Automatic Single Phase to Earth Fault Current Compensation in Networks with Arc Suppression Coil in Neutral Point

At the present time approximately 20% of 6–10 kV cable networks operate with resonant-grounded via arc-suppression coil (ASC) neutral point [1] . Meanwhile, an increasing number of experts note that resonant grounding of neutral point via ASC cannot solve the issue of single phase to earth faults (SPEF) negative consequences and their most dangerous variation, which is called intermittent arc single phase to earth fault (IASPEF) [for example, 2]. The main reasons for the inadequate efficiency of this neutral grounding mode are higher harmonic components in steady-state SPEF current, as well as higher harmonic components which are due to intensive transient processes during SPEF, which cannot be compensates by the usage of ASC. For the compensation of these components it is necessary to apply the devices, which will be complement ASC; these devices, together with the ASC, can be called a system of full compensation of the SPEF current.