Research of Transformer Protection against Short Circuit Current after Introducing a Relay Protection Element

The paper considers a virtual model of a power transformer designed to power general-purpose industrial installations, investigates the operating modes to determine all the parameters of the equivalent circuit, the operation of the transformer for resistive, resistive-capacitive and resistive-inductive loads. The simulation of the short circuit mode of the transformer was carried out and the response time of the relay protection element was calculated.