SHORT-CURRENT PROTECTION ACTION CURRENT ADJUSTING METHOD AND DEVICE THEREOF AND DEVICE FOR MULTI-POLE ELECTROMAGNETIC RELEASE

The invention discloses a short-circuit protection action current adjusting method and a device thereof for a multi-pole electromagnetic release. An electromagnetic system comprises an auxiliary static iron core, a second static iron core, a coil, a reset spring and a dynamic iron core; at an initial position, a first gap is formed between the auxiliary static iron core and the dynamic iron core, a second gap is formed between the dynamic iron core and the second static iron core, and the thickness of the second gap changes in the same direction along with the size variation of a release threshold; the elastic force of the reset spring changes oppositely along with the size variation of the release threshold; when a release current value is adjusted from large to small, the coil energy reduces in a quadratic relationship mode along with flowing currents and meanwhile the electromagnetic attraction between the dynamic iron core and the second static iron core is increased in a quadratic relationship mode, which is in inverse proportion to reduction of the thickness of the second gap. According to the short-circuit protection action current adjusting method and device thereof for the multi-pole electromagnetic release, adjustment of the release current value and electromagnetic attraction required by actions of the dynamic iron core are in a linear fixed corresponding relationship due to automatically achieved balance between two quadratic functions, and adjustment of the release threshold through the user is convenient, reliable and stable. Cette invention concerne un procédé de régulation de courant à fonction de protection contre les courts-circuits et son dispositif de déclenchement électromagnétique multipolaire. Ledit système électromagnétique comprend un noyau de fer statique auxiliaire, un second noyau de fer statique, une bobine, un ressort de réinitialisation et un noyau de fer mobile. Dans une position initiale, un premier entrefer est ménagé entre le noyau de fer statique auxiliaire et le noyau de fer mobile, et un second entrefer est ménagé entre le noyau de fer mobile et le second noyau de fer statique. L'épaisseur du second entrefer change parallèlement aux variations de grandeur d'une valeur seuil de déclenchement, et l'élasticité du ressort de réinitialisation varie de manière inverse aux variations de grandeur de la valeur seuil de déclenchement. Lorsqu'une valeur de courant de déclenchement est régulée de manière à être réduite, l'énergie