Induction Type Directional Over Current Relay Eees In Constructional details: fig. 21.17 shows the, important constructional details of a typical non directional induction type overcurrent relay. it consists of a metallic (aluminium) disc which is free to rotate in between the poles of two electromagnets. Overcurrent relay operates when the current in the circuit exceeds a specific preset value. induction type non directional overcurrent relays can be constructed in the same way as a wattage meter with some modifications.
Non Directional Induction Type Overcurrent Relay Construction Working The document describes the construction and working principles of induction type directional overcurrent and power relays, which utilize an aluminum disc within magnetic fields created by current and voltage coils. Construction and working principle of instantaneous over current relay is quite simple. in an instantaneous overcurrent relay, a magnetic core is wrapped with a current coil. An induction type overcurrent relay giving inverse time operation with a definite minimum time characteristic is shown in fig. 3.25. it consists essentially of an ac energy meter mechanism with slight modification to give required characteristics. the relay has two electromagnets. An overcurrent relay is a protective device that is used to trip or open a circuit when the current flowing through it exceeds the threshold limit set by the relay.
Non Directional Induction Type Overcurrent Relay Construction Working An induction type overcurrent relay giving inverse time operation with a definite minimum time characteristic is shown in fig. 3.25. it consists essentially of an ac energy meter mechanism with slight modification to give required characteristics. the relay has two electromagnets. An overcurrent relay is a protective device that is used to trip or open a circuit when the current flowing through it exceeds the threshold limit set by the relay. In the overcurrent relays, a current is sensed but such relays are not very sensitive as these relays cannot distinguish between heavy loads and minor fault conditions. The figure below shows the constructional of nondirectional induction type overcurrent relay. it consists of two electromagnets. the upper is e shaped while the lower is u shaped. the aluminium disc is free to rotate between the two magnets. Non directional induction type overcurrent relay construction the device features a rotating metallic disc between two electromagnets. the upper electromagnet's primary winding connects to a current transformer and adjusts current settings via a plug setting bridge. Construction: the relay works on induction principle. actuating quantity is current (from ct secondary). the primary winding is connected to secondary of c. t. in the line to be protected. an aluminum disc is pivoted which moves freely between two electromagnets. the primary is tapped (1 7).
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