Scientific paper ID 2524 : 2024/3

The object presented in the report, the ”Veslets” rectifier station, occupies a very important part in the electricity supply of ”Stolichen Elektrotransport” EAD. Through it, electricity is supplied to the tram and trolleybus contact network in the central part of the Capital. The TIS ”Veslets” in question supplies with direct current two DC/DC charging stations for electric buses for fast charging, as well as the tram and trolleybus contact networks with an area divided into 12 electrical sections, of which 8 from the tram contact network and 4 from The last reconstruction of the considered TIS ”Veslets” was carried out in 1971, during which the mercury converters and all the equipment were replaced with new silicon converters. The supplied equipment is manufactured by VEB Kombinat – Berlin. As a result of over 40 years of operation and the relatively heavy working mode, most of the equipment, such as the fast-acting circuit breakers, power transformers and rectifiers, are physically and morally amortized. the trolleybus network powered by direct current cables. After the reconstruction and modernization of the facilities, they were replaced by new ones manufactured by a world-renowned company, the rectifier station is controlled by a dispatcher using the SСADA system, while with the old equipment this was done by ”Telemanagement”, through telephone pairs, and over time also adds with LAN cable connection [1], [2].