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    Nonsaturating induction relay
    31.
    发明授权
    Nonsaturating induction relay 失效
    非感应继电器

    公开(公告)号：US1539812A

    公开(公告)日：1925-05-26

    申请号：US61433123

    申请日：1923-01-22

    Applicant: GEN ELECTRIC

    Inventor： HALL CHESTER I

    IPC: H02H3/093

    CPC classification number: H02H3/093

    Abstract: 210,092. British Thomson-Houston Co., Ltd., (Assignees of Hall, C. I.). Jan. 22, 1923, [Convention date]. Induction relays.-The time-characteristic of an inverse time-limit overload relay of the induction type is improved, so that greater selectivity is obtained for a number of relays in series in the event of a heavy overload, by employing a non- saturated core energized by the supply current and so arranged that an increased leakage flux in relation to the driving flux and varying directly with the current is produced therefrom to cut the disc and produce a retarding torque which increases with the speed of the disc. As shown in Fig. 1, the relay comprises the usual disc 1 on the spindle 2 controlled by the spring 11 actuated by the driving magnet 3 having an energizing coil 25 and shaded poles 3 . The poles are longitudinally and rotation ally adjustable on pins at the ends of the magnet; the rotational adjustment may be made, as shown, by a worm-wheel 54 acting through a gear wheel 54 . The coil 25 is subdivided into a main single central portion and additional portions which have half their turns on either side of the main portion so as to maintain the central symmetry. The various windings are brought out to a small plug board 41 so that, by means of a plug 61, the central portion alone, or the central portion together with any or all of the additional windings connected in parallel therewith, may be utilized as the energizing winding. By suitable choice of the coils to be energized, the relay may be adapted to circuits of different normal amperage. The disc is held in its normal position, against the action of the spring 11, by a pin 9 on the gear-wheel 7 abutting against the back-stop 10. This stop is adjustable over the scale 13 and its position determines the necessary travel of the disc before the stop presses together contacts 14, 15, which are electromagnetically maintained, and close the tripping circuit. Serrations of progressively increasing depth are formed in the disc to give gradually increasing torque, thereby compensating for the increasing control torque of the spring 11. The serrations cease at the correct point to supply the final increased torque for the switching movement. The driving magnet lies over a chord of the disc and a leakage flux, producing a retarding torque proportional to the square of the current and to the speed of the disc, always cuts the disc. Due to this leakage flux, the increase in the time of action of the relay is made greater for large overloads and smaller for small overloads than can be obtained with the retardation due to the usual permanent magnets 4, 5 alone.

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