Computer simulation of cable lightning protection of 110-kV voltage double-circuit PTL by Simulink

The article deals with the problem of improving the quality of lightning protection due to a more accurate calculation of its parameters. A protective cable was chosen as a means of protection. The urgency of the task is due to the need to improve the quality and uninterrupted power supply in modern conditions. As an object of study, a section of a real network of electrical connections with a voltage of 110 kV in the form of overhead lines on PB-100-8 supports, to which heterogeneous consumers are connected, was chosen. It has been experimentally established that consumers have mutual influence on each other. Under these conditions, it is difficult to apply traditional methods for calculating lightning protection. The aim of the study is to analyze the effect of the ground wire conductor on the transient processes of a real double-circuit overhead power supply line. Materials and methods. In the Simulink package, a simulation model of the interaction of the elements of the power supply system, switches and consumers has been developed, reproducing various network operation modes: idle, load, short circuit. The overvoltage limitation in the model is not taken into account for research purposes. The missing data was obtained from third-party sources and using the Google Earth program. The adequacy of the model was proved by comparing the results with experimental data, including calculations of the mutual influence of consumers. Results. A simulation scenario has been developed that provides for several switching and short circuits in the network. The influence of a lightning protection cable in various operating modes is analyzed. By analyzing the oscillograms of the network, the mutual influence of conductors of different circuits of a high-voltage line was studied. It is shown that this influence is significant, and it must be taken into account when calculating the parameters of lightning protection. The reverse effect of lightning protection on the electrical network is estimated. Conclusion. The developed model can be used for a wide range of 100 kV networks equipped with lightning protection devices. In this case, the effectiveness of the selected security cable has been confirmed. An important private conclusion from the simulation results is the conclusion about an insignificant (less than 1 %) power loss in the network due to the organization of a cable lightning protection.