| 摘要 |
The proposed cabinet of a factory-assembled switchgear contains a housing with a cell for relay, a cell for connecting buses, a cell for cable inlets and current transformers, an earthing device, and a cell for a rolling-out carriage. In the cell for a rolling-out carriage, a carriage with a main switch and a unit for the electric interlocking, moving the carriage form the operating position to the test position, and fixing the position of the carriage. The said unit contains a screw with a nut, a double-arm lever, a spring-loaded rod with stops, a unit for fixing the carriage, with a latch and a plate with holes, a lever for mechanically actuating the main switch, and a limit switch that is inserted in the electric interlocking circuit. The screw is supported by bearings arranged at the supports provided in the cell for the rolling-out carriage. The nut is fixed to the rolling-out carriage and locked in order to prevent the rotation and displacement when the screw rotates. The double-arm lever is coupled with the screw and the spring-loaded rod. If the screw rotates, the lever turns and displaces the rod. The rod, via the stops, causes the operation of the limit switch and the displacement of the lever for mechanically actuating the main switch, resulting in opening the contacts of the main switch. On further displacing the rod, the unit for the electric interlocking is switched on and the latch is moved, entering the corresponding hole of the plate of the unit for fixing the carriage.
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