Simulation of maximum and minimum relays
Relay is the main element in modeling relay protection. A relay is a non-linear element that changes its output value in steps with a certain change in the input quantity.
Simulation of electrical networks and relay protection, analysis of the protection.
Relay is the main element in modeling relay protection. A relay is a non-linear element that changes its output value in steps with a certain change in the input quantity.
The Matlab / Simulink software package allows you to simulate not only electrical networks, but also much more, including relay protection and automation algorithms.
In addition to the previous article, we will consider an example of compiling a network model with isolated neutral. Consider the simplest power line with one-way power supply (Fig. 1). It is necessary to draw up a power transmission model that will give out currents and voltages at the beginning of the line in short circuit modes and in single-phase earth fault modes.
Read More »Phase Coordinates Method: An Example of Building a Network Model with Isolated Neutral
The phase coordinate method allows you to simulate networks with isolated neutral. In Russia, networks of 6-10-35 kV (sometimes 110 kV) operate with isolated neutral. Such networks are accompanied by small currents and significant overvoltages during single-phase earth faults.
Read More »Phase Coordinates Method: Application for Isolated Neutral Networks
According to the “Electrical Installation Rules”, one full transposition cycle should be performed on overhead power transmission lines with a voltage of 110-500 kV and a length of more than 100 km to limit asymmetry of currents and voltages.