Types of relays used in power systems pdf

 

 

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These are of several types like a shaded pole, watt-hour, and induction cup structures and are mostly used as directional relays in power-system protection These relays were the earliest forms of relay used for the protection of power systems, and they date back nearly 100 years. They work on the principle of. used, the power to both the trip and close circuits is AC. There are many types of protective relays and protection schemes available. types: electromagnetic relays, thermal relays, power varied relays, These are used as protective relays in AC systems alone and are unusable with DC. 1.4 Protection System Requirements and some basic terminologies used. 1.5 Classification and principle of different types of electromagnetic relays.Relays are the essential component for protection & switching of a number of the control circuits & other electrical components. All the Relays react to voltage

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