ELECTROMAGNETIC DRIVE WITH TWO STEADY STATES FOR MEDIUM VOLTAGE AUTOMATIC SWITCH Russian patent published in 2015 - IPC H01H33/66 

FIELD: electricity.

SUBSTANCE: electromagnetic drive (5) with two steady states contains at least one electric coil (7) for switching of a ferromagnetic armature (6) between the first end position and the second end position under the electromagnetic field action, and at least one permanent magnet (8) for holding of the armature (6) in one of two end positions corresponding to open or closed position of switching of an automatic switch which is mechanically connected to it. The armature (6) contains a top plunger (9) supported by the ferromagnetic core (10) of one electric coil (7) for static holding of the armature (6) in the first end position, connected to the plunger rod (12) passing through the ferromagnetic core (10) and through the permanent magnet (8) for mechanical connection of the drive (5) with the automatic switch. The armature (6) also contains the bottom plunger (13) through detachable connector installed on the opposite side of the plunger rod (12) with an axial gap with reference to the core (10) and with a possibility of movement with reference to the core (10) for the shifting of the armature (6) to the second end position at decrease of the magnetic flux passing through the top plunger (9).

EFFECT: creation of a compact electromagnetic drive allowing to perform an opening operation of a medium-voltage automatic circuit breaker at low energy costs.

12 cl, 5 dwg