# Simulation

Simulation of electrical networks and relay protection, analysis of the protection.

## Phase Coordinates Method: An Example of Compiling a Network Model

Consider an example of compiling a power transmission model using the phase coordinate method. In fig. 1 shows the power transmission, a mathematical model of which must be compiled. It is necessary to determine the currents in the short circuit mode at the beginning of the line.

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## Phase Coordinates Method: Short Circuit with Break Model

Some complex types of damage can occur in power lines, for example, a short circuit with a wire break. This mode can occur when a wire of any phase falls to the ground (Fig. 1).

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## Phase Coordinates Method: Equivalent Load Model

The equivalent load in phase coordinates is given by a constant active and reactive power. Based on the magnitude of the load power and voltage, a direct transfer matrix is calculated.