Specified Model of a Double-Circuit Transmission Line with Two Ground Wires for Calculating a Single-Phase Short Circuit Current in a Network with an Effectively Grounded Neutral

The article presents a combined equivalent circuit for a double-circuit power transmission line with two ground wires. The proposed mathematical model is based on a combination of the method of symmetrical components and phase coordinates. This approach makes it possible to take into account the electromagnetic and electrostatic interaction of the conductive elements of the line, as well as the possible asymmetric arrangement of the wires and the cable on the tower relative to each other. In this case, the rest of the equivalent circuit can be modeled in symmetrical components, which greatly simplifies the equivalent circuit and the calculation of the mode parameters.