<ol>
	<li style="text-align: justify;">
	<p><span style="font-size:14px">NO Contact: The contact of a relay which remains open when the relay is in deenergized condition.</span></p>
	</li>
	<li style="text-align: justify;">
	<p><span style="font-size:14px">NC Contact: The contact of a protective relay which remains closed when the relay is in deenergized condition.</span></p>
	</li>
	<li style="text-align: justify;">
	<p><span style="font-size:14px">Power Swing: An oscillation between groups of synchronous machines caused by fault in the power system.</span></p>
	</li>
	<li style="text-align: justify;">
	<p><span style="font-size:14px">Burden: Power absorbed by the circuits of a relay expressed in VA.</span></p>
	</li>
	<li style="text-align: justify;">
	<p><span style="font-size:14px">Reach: The remote limit of zone of protection provided by the protective relay.</span></p>
	</li>
	<li style="text-align: justify;">
	<p><span style="font-size:14px">Overreach: When the protective relay operates for the fault beyond its zone of protection, it is said to have overreached.</span></p>
	</li>
	<li style="text-align: justify;">
	<p><span style="font-size:14px">Underreach: When the protective relay fails to operate for the fault within its zone of protection, it is said to have underreached.</span></p>
	</li>
</ol>