Special zero-sequence current transformers to determine fault connection in medium voltage networks

The authors have completed an analyzes and propose results of experiments on the use of various types of special transformers of zero sequence current to determine the fault connection in overhead lines with insulated neutral. A device for determining the single-phase earth faults in overhead lines with insulated neutral without installing cable insertion to the first air-line support is offered. An experimental sample of a current transformer of rectangular shape has been developed. The recommendations for use of current transformers of zero sequence current to determine a faulted connection in overhead networks with insulated neutral are formulated.