Earthing control device of a medium-voltage electric protection apparatus formed by at least two electric protection apparatuses

FIELD: electrical engineering.SUBSTANCE: electrical protection switchgear comprises a device for controlling its grounding, at least two electrical protection devices, each device comprising means for interrupting current and means for isolating circuit (2, 4) installed in series, and a mechanism for controlling its circuit-breaker. First control mechanism M1 of the circuit-breaker of the so-called first of the protection devices comprises a movable element and controls the so-called second control mechanism M2 of the circuit-breaker of the so-called second protection device by so-called coupling mechanism L such that during the first movement part for driving the movable member in the opening direction of first circuit-breaker (2) to a certain so-called maximum rotational position of said shafts (8, 9) two control shafts (8, 9) of two circuit-breakers (2, 4) are connected during rotation. Once second circuit-breaker (4) reaches a certain distance from the correlated line contact, enabling a certain isolation distance to be established, two mechanisms M1, M2 are separated so that two shafts (8, 9) continue their rotational movement independently of each other in the direction of opening circuit-breakers (2, 4).EFFECT: technical result is to provide control of two mechanisms by means of one movable lever, which allows each mechanism to maintain its closing speed without affecting the other mechanism.15 cl, 13 dwg