Percentage differential is introduced to remove the drawback of the differential relay. Percentage differential relay consists of two coils other then that of differential relay. percentage differential relay is more featuristic then that of normal differential relay.
The video consists of complete explanation of percentage differential relay and how it is better from the differential relay. so before watching this video watch the previous lecture on differential relay.
The lecture are completely short and simple. For more u can mail me on :kunalkumar94060@gmail.com

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