Development and Testing of a Methodology for Studying Digital Instrument Transformers under Conditions of Arc Intermittent Single-Phase Ground Faults

In Ivanovo State Power Engineering University (ISPEU, Ivanovo, Russia) digital instrument current and voltage transformers (DCVTs) has developed. Numerous studies and tests of DCVTs have been carried out; these devices already have operating experience in existing electrical facilities. However, some areas of application of DCVTs require additional research. The article presents a methodology for experimental study of 6(10) kV DCVTs under conditions of arc intermittent single-phase ground faults, a diagram of a test installation, as well as the results of testing the methodology. The article presents the quantitative characteristics of the modes obtained in laboratory conditions. The modes of arc intermittent single-phase ground faults and ferroresonance were simulated using electromagnetic measuring voltage transformers in the installation. However, during the experiments, some shortcomings in the methodology of the experiment were revealed. The article also indicates measures to improve the methodology for conducting further experimental studies of DCVTs.