Heavy-current isolating switch cabinet for track traffic

Abstract

The invention discloses a heavy-current isolating switch cabinet for track traffic, which comprises a cabinet body (1), a base frame (4), an isolating switch (3) and a ground switch (2), wherein an isolator of the ground switch (2) is rotatably connected onto the base frame (4) through a ground knife shaft (14); a moving contact knife board of the isolating switch (3) is connected with an isolated knife shaft (7) which is rotatably connected onto the base frame (4) through a drag link mechanism; one side of the base frame (4) is connected with a first mechanical interlocking device by which the ground switch cannot be switched on when the isolating switch is positioned in a switched-on state; and the other side of the base frame (4) is connected with a second mechanical interlocking device by which the isolating switch cannot be switched on when the ground switch is positioned in a switched-on state. Therefore, by using a series of automatic mechanical mechanisms, the trouble of operation programs is greatly reduced and the insecurity caused by human mistaken operation can be avoided simultaneously.

Description

technical field [0001] The invention relates to the technical field of urban rail transit, in particular to a high-current isolating switchgear for rail transit, which is suitable for controlling the on-off of the circuit when there is voltage and no load in the rail transit DC 1500V contact rail line. Background technique [0002] At present, urban rail transit (such as subway) usually uses a DC 1500V traction power supply system to cut and close single-phase lines with voltage and no load. The two commonly used systems in this rail transit traction power supply system are flexible overhead catenary standard and contact rail system. The catenary system is arranged overhead, the space will be messy, and there are certain safety hazards in outdoor installation; the more advanced is the catenary system, which is arranged on the ground parallel to the track side of the vehicle movement with a power grid with a protective cover. The track, and the control electrical isolation s...

AI Technical Summary

Problems solved by technology

However, since the two moving contact blades and the upper static contact seat are compressed with spring preload pressure when closing the gate, when it needs to be disconnected, the contact between the two moving contact blades and the upper static contact seat Sliding will generate friction; in this way, on the one hand, it takes a lot of operating force to disconnect the switch, especially when the contact area between the upper static contact seat and the moving contact blade increases, it is easy to appear The situation that the moving contact blade cannot be pulled out; on the other hand, over a long period of use, excessive wear will occur between the moving contact blade and the upper static contact seat, thereby shortening the service life of the switch

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