Analysis of the fleet and evaluation of the switching resource of 10 kv switches of the branch of pjsc «Rosseti Center»-«Orelenergo»

THE PURPOSE. Analysis of the fleet and evaluation of the switching resource of 10 kV switches of the branch of PJSC «Rosseti Center»-«Orelenergo». METHODS. In the work, based on the database of the branch of PJSC «Rosseti Center»-«Orelenergo», an analysis of the fleet of 10 kV high-voltage switches was carried out, the types of switches used, their shares in the fleet of switches were identified. The park of circuit breakers was investigated according to technical characteristics, including rated currents and currents of maximum breaking capacity in accordance with GOST R 52565-2006 and GOST 687-78, as well as the current standards of the technical organization of PJSC «Rosseti». RESULTS. In the course of the study, it was revealed that the fleet of 10 kV switches installed in switchgear substations with a higher voltage of 35-110 kV of the branch of PJSC «Rosseti Center»-«Orelenergo» is represented by 1833 switching devices, among which: 1197 switches with low-oil arc extinguishing chambers, 636 switches with vacuum, which is, respectively, 65% and 35% of the park. At the same time, 1009 switching devices have a rated current of 630 A, and 366 switching devices – 1000 A, 1526 pieces of equipment have a rated cut-off current of 20 kA. A comparison of a low-oil switch of the VMP type and a vacuum switch BBB with a modern vacuum switch of the BB/TEL series from the point of view of the switching resource in order to justify its use to replace these switches on specific power lines. CONCLUSIONS. Identification of the parameters of the 10 kV circuit breaker fleet makes it possible to develop rational plans for equipment replacement. Analysis of the switching resource of different types of switches allows you to choose equipment with the best characteristics.