Ring main unit

The invention provides a kind of ring main unit, including incoming line cabinet, incoming line cabinet includes the first incoming line cabinet and the second incoming line cabinet, and the input of the first incoming line cabinet and the second incoming line cabinet is connected with power supply respectively, and the outfan of the first incoming line cabinet and the second incoming line cabinet is connected with same load respectively；First incoming line cabinet has the first switch operation mechanism, and the first switch operation mechanism makes the first incoming line cabinet have the first on-position and the first open position；Incoming line cabinet also includes the first locking device, first locking device includes the first drive mechanism and the first baffle plate being connected with the first drive mechanism, rotate the first switch operation mechanism when making the first incoming line cabinet be in the first on-position, first drive mechanism drives the first baffle plate to move so that the first baffle plate be in the working place blocking second switch operating mechanism first block position.Technical scheme efficiently solves the problem that whole electric power system will be caused to paralyse after ring main unit breaks down in prior art, and avoids maloperation generation.