Differential Protection Quiz

The only drawback of the differential protection principle is that it requires currents from the extremities of a zone of protection, which restricts its application to the protection of specific electrical equipment, such as generators, transformers, motors of large size, bus zones, reactors, and capacitors.

Differential protection is called unit protection because it is confined to the protection of a particular unit (equipment) of a power plant or substation.

The main principle behind differential protection is to identify internal faults by comparing the electrical conditions at the terminals of the electrical equipment to be protected, based on the fact that any internal fault would cause the current entering the equipment to be different from that leaving it.

<p>The main component of a differential protection scheme is the differential relay, which operates when the phasor difference of two or more similar electrical quantities exceeds a predetermined value.</p> Signup and view all the answers

<p>Most differential relays are of current differential type, with current transformers (CTs) placed on both sides of each winding of a machine, and the outputs of their secondaries applied to the relay coils.</p> Signup and view all the answers