MODELING OF VOLTAGE MEASUREMENT CIRCUITS IN HIGH-VOLTAGE SWITCHGEAR

A physical model of a high-voltage switchgear with single-phase measuring voltage transformers is proposed, which is based on the equivalent circuit of an electric network and real small-sized step-down transformers. A laboratory stand has been created on the basis of the model, which allows studying the connection diagrams of measuring transformers and analyzing the measured voltage values for various modes: normal, wire breaks, short circuits between phases, single-phase short circuits to ground. It is shown that the voltage values obtained on the laboratory stand correspond to the theoretical expected values, but are not equal to them, since the measurements are performed for a real electric network and its asymmetry affects the measurement results. The use of the developed laboratory stand in the educational process will improve the level of training of students of energy specialties of universities and colleges.