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what are the differences between directional and non directional relay. I want to get information about relay. can anyone provide me any site address for this?
i found this in my "Power system switch gears and protection" text book.Directional relay senses direction of power flow by means of phase angle between V and I, When the phase angle between V and I exceeds certain predetermined value, the directional relay operates with a condition that the current is above the pickup value. Thus directional relay is a double actuating quantity relay with one input as current I from CT and the other input V from PT.
thank you all for your help.Gauthamvg may I know which book you do follow?
Thanks all