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18 FUNDAMENTAL RELAY-OPERATING PRINCIPLES AND CHARACTERISTICS Time delay is obtained in induction-type relays by a "drag magnet," which is a permanent magnet arranged so that the relay rotor cuts the flux between the poles of the magnet, as shown in Fig. 4. This p roduces a retarding effect on motion of the rotor in either di gs-wkbg.de Size: KB. An induction disc type relay adapted to apply to an induction disc a rotational torque proportional to an input so that an operating output is produced at the expiration of a predetermined time dependent on the magnitude of the input after the application of the input. Included in the relay are two sets of shading coils and reluctance paths responsive to the same input signal for applying the Cited by: •Simply stated an induction disc overcurrent relay is a precision single phase shaded pole induction motor. Time dial set on three then the operating time at three times the tap setting will be seconds. At 5 times the tap operate time will be seconds.

Induction disc type relay pdf

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All rights reserved. Login Sign up. Search Expert Search Quick Search. United States Patent Induction disc type relay pdf induction disc type relay adapted to apply to an induction disc a rotational torque proportional to an input so that an operating output is produced at the induction disc type relay pdf of a predetermined time dependent on the magnitude of the input after the application of the input. Included in the relay are two sets of shading coils and reluctance paths responsive to the same input signal for applying the rotation torque to the induction disc, whereby and desired time lag characteristic can carter observatory matariki video readily obtained. Click for automatic bibliography generation. Download PDF We claim 1. In an induction disc type relay including an induction disc and means for applying a rotational torque to said disc, the improvement wherein said means for applying a rotational torque to said disc comprises: 2.

Electromagnetic-induction relays use the principle of the induction motor whereby torque is developed by induction in a rotor; this operating principle applies only to relays actuated by alternating current, and in dealing with those relays we shall call them simply "induction-type" relays. Induction Disc Relay. In this type of relay,a metal disc is allowed to rotate between two gs-wkbg.de electromagnets are energized by the interaction of the flux of one of the magnets and the eddy current induced in the disc by other. The different types of structure that have been used are commonly called. Induction Disc Relay-Construction,Working. Relays. Induction Cup Relay is also a type of induction disc gs-wkbg.de basic principle on which induction cup relay works is same as that of induction motor. In construction also it is identical to induction motor. Aug 31,  · Mathematically it can be expressed as- The induction disc type relay is based on the same principle as that of an ammeter or a volt meter, or a wattmeter or a watt hour mater. In induction relay the deflecting torque is produced by the eddy currents in an aluminium or copper disc by the flux of an AC electromagnet. •Simply stated an induction disc overcurrent relay is a precision single phase shaded pole induction motor. Time dial set on three then the operating time at three times the tap setting will be seconds. At 5 times the tap operate time will be seconds. Induction Cup Type-Directional or Power Relay. By design, the angle can be made to approach any value and a torque equation T = gs-wkbg.de (φ − θ) obtained, where θ is the E - I system angle. Accordingly, induction-cup type relay can be designed to produced maximum torque When system angle θ = . 18 FUNDAMENTAL RELAY-OPERATING PRINCIPLES AND CHARACTERISTICS Time delay is obtained in induction-type relays by a "drag magnet," which is a permanent magnet arranged so that the relay rotor cuts the flux between the poles of the magnet, as shown in Fig. 4. This p roduces a retarding effect on motion of the rotor in either di gs-wkbg.de Size: KB. disc. The Watt-hour structure type relay works as an electromagnetic induction type of watt-hour – a meter so named, after it. It consists of two magnets: upper and lower electromagnets and aluminium disc, which is pivoted such that it rotates freely between the two electromagnets. An induction disc type relay adapted to apply to an induction disc a rotational torque proportional to an input so that an operating output is produced at the expiration of a predetermined time dependent on the magnitude of the input after the application of the input. Included in the relay are two sets of shading coils and reluctance paths responsive to the same input signal for applying the Cited by: Jun 27,  · The induction disc type relays which are now in practical use may be divided into two broad classes according to the kinds of driving electromagnets used, that is, a transformer (split phase) type relay as shown in FIG. 2 and a shading coil type relay as shown in FIG.An induction disc type relay adapted to apply to an induction disc a rotational torque proportional to an input so that an operating output is. Electromagnetic induction or simply induction relays: operation depends on the movement of a metallic disc or cylinder free to rotate by the interaction of Moving coil type relays: In such a relay moving member consists of a coil free to. Induction type relays are most widely used for protective-relaying force is developed in a movable element,that may be a disc or other form of. Relay. Induction Type Directional. Overcurrent Relay. Distance or . An induction relay essentially consists of a pivoted aluminium disc placed. type relay. Induction-type relays are the most widely used protective relaying where ac quantities are involved. One such relay is the induction disc relay. This type of relay compares the relative phase angle between two AC quantities. .. Induction disc- or cup-type relays may be energized from voltage sources to. An induction disc type relay adapted to apply to an induction disc a rotational torque proportional to an input so that an Download PDF Find Prior Art Similar. Electromagnetic-induction relays use the principle of the induction motor . Close-up of an induction-type overcurrent unit, showing the disc rotor and drag. - Use induction disc type relay pdf and enjoy Electromagnetic relay

Slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. If you continue browsing the site, you agree to the use of cookies on this website. See our User Agreement and Privacy Policy. See our Privacy Policy and User Agreement for details. Published on Nov 27, The types of Electromagnetic relay and its principles are explained. SlideShare Explore Search You. Submit Search. Home Explore.

See more international relations middle east pdf Although not shown in FIG. Depending on the type of rotor whether a disc or a cup the relay is known as an induction disc or an induction cup relay. Normally the relay contacts are operated directly by an arm carried on the rotor spindle but in some time lag types the rotor runs at a comparatively high speed and the contacts are driven through gears. These two types ofrelays will now be briefly described. A modern induction disc relay will have an overrun of not more than 2 cycles on interruption of 20 times the setting quantity. An induction disc 13 is also disposed in the air gap formed by the core 9 so that the induction disc 13 rotates about a shaft 14 within the air gap. The induction disc type relays which are now in practical use may be divided into two broad classes according to the kinds of driving electromagnets used, that is, a transformer split phase type relay as shown in FIG. In FIG, 7, numerals 23 and 24 designate electromagnets for producing an operating torque and a restraining torque, respectively, and the electromagnet 23 comprises a core 27 which is provided with magnetic poles 26, 26 with shading coils 25, 25' and on which is wound an exciting coil 28 to which an input is applied, whereby the operating torque in the direction of an arrow 30 is produced on an induction disc 29 rotatably disposed between the magnetic poles 26, The magnetic pole portions where the magnetic flux in the core 16 interlinks the disc 17 are divided into pairs of magnetic poles 19, 19 and 20, 20' and each of these poles 19, 19 and 20, 20' is in turn forked so that shading coils 21, 21', 22 and 22' are mounted at the respective positions of the forked poles.

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