Development of a simulation model of relay protection for the newly commissioned 220 kV line L-2-K-4 at the Keles substation

Abstract

Relevance: in a modern power system, relay protection plays an important role in ensuring the reliability and safety of electrical networks. This is especially relevant for overhead power lines with a voltage of 220 kV and higher operating in the unified energy system of Central Asia. The analysis showed that the majority of existing relay protection systems are electromechanical devices, most of which have exhausted their service life and are technically obsolete. This indicates the need for a gradual transition to microprocessor devices developed on the basis of modern digital technologies.

Aim: development of a simulation model of relay protection of the newly introduced power transmission line L-2-K-4-220 kV at the Keles substation with a voltage of 220/110/10 kV based on the DIgSILENT PowerFactory software.

Methods: programs for designing electronic computers, in particular, the model of the Siemens microprocessor device version 7SA6 from the DIgSILENT PowerFactory software library is used.

Results: a simulation model of the newly commissioned overhead power transmission network L-2-K-4 was developed, and testing of it under real conditions showed a high degree of conformity of the model to real conditions. The operation of the protective devices was also tested using a simulation model, with the first, second and third stages of distance protection of the L-2-K-4 overhead power transmission network located within the circular characteristic. The resistances of the first, second and third stages of protection were 10.67 Ohms, 44.99 Ohms and 63.998 Ohms, respectively, and the exposure times of the second and third stages were 1 and 3 seconds.