Application and Research of Digital Current and Voltage Measuring Transformers 6–10 Kv for Single-Phase Earth Fault Location

Medium-voltage distribution networks (6–10 kV in Russia) are the largest and at the same time the most problematic link in the power supply system of consumers. Improving the reliability of medium-voltage overhead distribution networks is still an urgent task. The task of improving the reliability of networks is directly related to the improvement of algorithms and devices for single-phase earth fault (SPEF) location. Researches of Ivanovo State Power Engineering University (ISPEU) and an industrial partner developed automated power control and metering station (APCMS) based on digital measurement voltage and current transformers (DCVT). APCMS contains the function of detecting a damaged section (branch) of a 6–10 kV overhead power transmission line (OTL). In the installed APCMS sample the function works in the test mode, so additional studies of DCVT and APCMS for the tasks of fault location are relevant. The article presents the methodology for determining the faulted section in case of SPEF, considers the features of application of 6–10 kV DCVT and APCMS for determining the faulted section, and also presents the methodology for additional studies of DCVT during SPEFs, including arc faults.