Automatic system of step of connection of star to triangle for starting of three-phase engines, with automatic disconnection for failure of any of the phases. (Machine-translation by Google Translate, not legally binding)

摘要

Star-triangle automatic starter with switching by the intensity in the starting that replaces the regular timing, and protection of the three phases. It consists of a main contactor (1) whose coil is connected between two phases but which in normal service are in series with a contact actuated by a suction relay (6) that protects against lack of tension in the third phase. It also consists of two nucleos of plate (7) and (11) that contrapone its activities of attraction on a movable armor (8). The coil (4) is of tension and is activated when connecting the main contactor and the (5) of intensity, connected in star. When the starting intensity falls below a certain preset value, the attaction of the coil (4) is greater than that of the (5) and the armor (8) moves dragging with the contacts (9) realizing in this form the step from star to triangle. (Machine-translation by Google Translate, not legally binding)