Disconnector for distribution transformers with dielectric liquid

摘要

The invention relates to a disconnector for distribution transformers with dielectric liquid intended for comprehensive protection of a power grid against the effects of failures caused by damage to the grid on the low voltage side or by damage to the transformer, and to an integrated system for protecting distribution transformers with dielectric liquid electrically connected with a switch at the low voltage side, or for distribution transformers operating in parallel in three-phase distribution networks.
The disconnector comprises at least two cylindrical current-limiting fuses (6) which are located inside the transformer tank (2), and each fuse (6) is electrically connected with the external phase power supply and through fixed contacts (7a) and moving contacts (7b) of the disconnector with the active part (3) of the transformer (1). The disconnector has an additional auxiliary contact (8) which is electrically connected with the switch (9) connected to the active part (3) of the transformer (1) on the low voltage side of the transformer (1).