| 摘要 |
<p>This relay comprises, in a housing (30), one detector unit (10) per phase delivering an image signal of the square of the intensity of the current in the phase, and an electronic processing circuit (31) which receives and processes the signals provided by the detector units in order to deliver a triggering signal. Each detector unit (10) includes a magnetic circuit formed by a fixed armature (11) and by a movable armature (12), both identically L-shaped and mounted head-to-tail; an electrical winding (20) coiled around the large branch of the L of the fixed armature (11) and traversed by the phase current; and a piezoelectric sheet (22) placed so as to bear against the two small branches belonging to the two L-armatures respectively, and subjected to a compressive force when the movable armature (12) is attracted by the fixed armature (11). <IMAGE></p> |
