Increasing the reliability of traction network protection by means of monitoring

The problem of reliable functioning of the protections of feeders of the DC traction network has arisen since the beginning of the development of electric transport, the growth of the power of electric rolling stock and the speed of movement. To solve it, developed countries have proposed hundreds of devices aimed at improving the reliability of functioning, but the task has not been completely solved to date, and many proposals (patents) they remained unsold, including at traction substations of mining enterprises and electric rolling stock of quarry railway transport. The reason is that all types of protections reacted to one parameter: current, voltage, resistance, heating of current-carrying parts and others. The creation of digital devices made it possible to create sets of protections that respond to several signs of a transient process in the traction network, and their joint occurrence can characterize an emergency mode and issue a command to disconnect the line (feeder). The authors have determined, in some modes, the values of short-circuit (SC) currents and especially the rate of change of current (di/dt) have been clarified in monitoring, which can be used as a sign of short circuit in combination with other factors in digital protections. It is established that in case of breakdown of insulation or power semiconductor devices in converters of traction substations, the SC current depends on the parameters of the external power supply circuit and the converter unit and can reach 20...80 kA. The experience of operating the sets as part of the classical current-pulse protection (MIZ) and multi-channel digital terminal (Inter) revealed difficulties in choosing the types of digital terminal protections, determining their coverage area and settings, as well as coordination with the MIZ. Small currents of remote short circuits also pose a danger to electrical equipment, since in the vast majority of cases an electric arc occurs at the short circuit site, the voltage drop in which is 200... 500 V, a large amount of heat is released at the short circuit site. As a result of the research conducted for the West Siberian Railway, an algorithm was proposed for setting the protection settings of the terminal and the MIZ, determining their zones of action based on mathematical modeling and using monitoring of the traction network operating modes, which significantly increased the reliability of the protection kit. Thus, in case of any types of violations of the normal operation of the electric transport system at the mining enterprises, it is necessary to take measures to eliminate the dangerous consequences of these violations. These functions are performed by the protection of the corresponding element of the traction network of mining enterprises.

Kuznetsov S. M., Andriyashin S. N. Increasing the reliability of traction network protection by means of monitoring. MIAB. Mining Inf. Anal. Bull. 2022;(12-2):143—156. [In Russ]. DOI: 10.25018/0236_1493_2022_122_0_143.

Kuznetsov S. M.¹, Cand. Sci. (Eng.), Assistant Professor, e-mail: ksmetk@mail.ru;
Andriyashin S. N.¹, assistant, e-mail: andriyashin.2014@corp.nstu.ru, ORCID ID: 0000-0003-1575-8933;
¹ Novosibirsk State Technical University,630073, Novosibirsk, Russia.

Andriyashin S. N., e-mail: andriyashin.2014@corp.nstu.ru.

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