November 2015 23
Differential Relays Provide Extra Protection
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Differential relays are used to provide protection in the following three areas: Transformers – this is the principal form of fault protection of transformers  Generators – this can provide very sensitive protection against internal faults Buses…

November 2015 11
Overcurrent Relay Benefits
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Overcurrent relays are the most common protective relay in an electrical system. They provide a time delay function for overloads They provide an instantaneous function for short circuits Some overcurrent relays can operate in one…