MODERNIZATION OF SWITCHING APPARATUS IN A SUBSTATION 110/10 kV

Gulek Nedjib; Vasil Dimitrov

Scientific paper ID 1874 : 2019/3

MODERNIZATION OF SWITCHING APPARATUS IN A SUBSTATION 110/10 kV

Gulek Nedjib, Vasil Dimitrov

The aim of the paper is to investigate the workload of the existing distribution network in the region of substation ”Boyana” 110/10 kV and to propose an alternative variant for reconstruction and modernization, including replacement of the switching equipment. New circuit breakers and disconnectors with improved performance have been selected that increases the security of electricity supply and the operational reliability of the network. The proposed methodology can be used in the design and modernization of substations. The following replacements are proposed: Circuit breakers in the outdoor distribution system 110 kV - installation of new SF6 circuit breakers LTB 123D1 123/2500/31,5 kA. These are some of the most contemporary types of circuit breakers, especially for HV networks. They have a high shut-off capability, smaller overall dimensions and weight with the same parameters, long service life. Circuit breakers in the indoor distribution system 10 kV - installation of contemporary vacuum circuit breakers VD-4 12/1250/20 kA. They are constructed using the separate pole technique. A vacuum interrupter is embedded in each pole. This construction method, thanks to a special production process, makes the poles particularly sturdy and protects the interrupter from shocks, dust and condensation. Installation of new disconnectors NSA 123/1600 (in the outdoor distribution system 110 kV), NRВ 12/630 (for line connections) and NRВ 12/1250 (for transformers connections).

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разпределителна мрежа СН елегазови прекъсвачи вакуумни прекъсвачи разединителиMV distribution network SF6 and vacuum circuit breakers disconnectorsGulek Nedjib Vasil Dimitrov

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