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	<title>circuitmaniac.com &#187; classification of relays</title>
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		<item>
		<title>INDUCTION TYPE DIRECTIONAL OVER CURRENT RELAY</title>
		<link>http://www.circuitmaniac.com/2009/03/23/induction-type-directional-over-current-relay/</link>
		<comments>http://www.circuitmaniac.com/2009/03/23/induction-type-directional-over-current-relay/#comments</comments>
		<pubDate>Mon, 23 Mar 2009 21:54:18 +0000</pubDate>
		<dc:creator>John</dc:creator>
				<category><![CDATA[classification of relays]]></category>
		<category><![CDATA[Power System]]></category>
		<category><![CDATA[Relays]]></category>
		<category><![CDATA[Switchgear&Protection]]></category>
		<category><![CDATA[directional element of relay]]></category>
		<category><![CDATA[directional over current relay]]></category>
		<category><![CDATA[INDUCTION TYPE DIRECTIONAL OVER CURRENT RELAY]]></category>
		<category><![CDATA[non directional element of relay]]></category>

		<guid isPermaLink="false">http://electricalandelectronics.org/?p=1555</guid>
		<description><![CDATA[The directional power relay is not suitable under short circuit conditions because as short circuit occurs the system voltage falls to a low value resulting in insufficient torque to cause relay operations. This difficulty is overcome in the directional over current relay, which is independent of system voltage and power factor. Constructional details: &#8211; Figure [...]]]></description>
		<wfw:commentRss>http://www.circuitmaniac.com/2009/03/23/induction-type-directional-over-current-relay/feed/</wfw:commentRss>
		<slash:comments>5</slash:comments>
		</item>
		<item>
		<title>INDUCTION TYPE DIRECTIONAL POWER RELAY</title>
		<link>http://www.circuitmaniac.com/2009/03/23/induction-type-directional-power-relay/</link>
		<comments>http://www.circuitmaniac.com/2009/03/23/induction-type-directional-power-relay/#comments</comments>
		<pubDate>Mon, 23 Mar 2009 21:06:15 +0000</pubDate>
		<dc:creator>John</dc:creator>
				<category><![CDATA[classification of relays]]></category>
		<category><![CDATA[Power System]]></category>
		<category><![CDATA[Relays]]></category>
		<category><![CDATA[Switchgear&Protection]]></category>
		<category><![CDATA[directional power relay]]></category>
		<category><![CDATA[INDUCTION TYPE DIRECTIONAL POWER RELAY]]></category>

		<guid isPermaLink="false">http://electricalandelectronics.org/?p=1552</guid>
		<description><![CDATA[The step of relay operates when the, power in the circuit flows, in a specific direction. A directional power relay is so designed that it obtains its operating torque by the interaction of magnetic field derived from both voltage and current source of the circuit it protects. The direction of torque depends upon the current [...]]]></description>
		<wfw:commentRss>http://www.circuitmaniac.com/2009/03/23/induction-type-directional-power-relay/feed/</wfw:commentRss>
		<slash:comments>1</slash:comments>
		</item>
		<item>
		<title>OVER LOAD INVERSE-TIME / INVERSE DEFINITE MINIMUM TIME LAG (I.D.M.T.) RELAY</title>
		<link>http://www.circuitmaniac.com/2009/03/17/over-load-inverse-time-inverse-definite-minimum-time-lag-idmt-relay/</link>
		<comments>http://www.circuitmaniac.com/2009/03/17/over-load-inverse-time-inverse-definite-minimum-time-lag-idmt-relay/#comments</comments>
		<pubDate>Tue, 17 Mar 2009 18:03:28 +0000</pubDate>
		<dc:creator>John</dc:creator>
				<category><![CDATA[classification of relays]]></category>
		<category><![CDATA[Power System]]></category>
		<category><![CDATA[Relays]]></category>
		<category><![CDATA[Switchgear&Protection]]></category>
		<category><![CDATA[I.D.M.T. characteristics]]></category>
		<category><![CDATA[OVER LOAD INVERSE-TIME / INVERSE DEFINITE MINIMUM TIME LAG (I.D.M.T.) RELAY]]></category>

		<guid isPermaLink="false">http://electricalandelectronics.org/?p=1416</guid>
		<description><![CDATA[The over load inverse time relay is shown in fig 26. It consists of an upper electromagnet that has been provided with two windings one primary and the other secondary. Primary is connected to a current transformer in the line which is under protection and is provided with eight tappings. These tappings are connected to [...]]]></description>
		<wfw:commentRss>http://www.circuitmaniac.com/2009/03/17/over-load-inverse-time-inverse-definite-minimum-time-lag-idmt-relay/feed/</wfw:commentRss>
		<slash:comments>3</slash:comments>
		</item>
		<item>
		<title>STATIC DISTANCE RELAY</title>
		<link>http://www.circuitmaniac.com/2009/03/17/static-distance-relay/</link>
		<comments>http://www.circuitmaniac.com/2009/03/17/static-distance-relay/#comments</comments>
		<pubDate>Tue, 17 Mar 2009 17:55:31 +0000</pubDate>
		<dc:creator>John</dc:creator>
				<category><![CDATA[classification of relays]]></category>
		<category><![CDATA[Power System]]></category>
		<category><![CDATA[Relays]]></category>
		<category><![CDATA[Switchgear&Protection]]></category>
		<category><![CDATA[distance relays]]></category>
		<category><![CDATA[protection of medium and long transmission lines]]></category>
		<category><![CDATA[STATIC DISTANCE RELAY]]></category>
		<category><![CDATA[zone-wise protection]]></category>

		<guid isPermaLink="false">http://electricalandelectronics.org/?p=1413</guid>
		<description><![CDATA[Distance relays are characterized by having two input quantities proportional to the voltage and current at a particular point in the power system, referred to as the relaying point. Ideal static distance relays have characteristics independent of actual magnitudes of voltage and current but dependent only on their ratio and phase angle between them. The [...]]]></description>
		<wfw:commentRss>http://www.circuitmaniac.com/2009/03/17/static-distance-relay/feed/</wfw:commentRss>
		<slash:comments>1</slash:comments>
		</item>
		<item>
		<title>STATIC DIFFERENTIAL RELAY</title>
		<link>http://www.circuitmaniac.com/2009/03/17/static-differential-relay/</link>
		<comments>http://www.circuitmaniac.com/2009/03/17/static-differential-relay/#comments</comments>
		<pubDate>Tue, 17 Mar 2009 17:49:24 +0000</pubDate>
		<dc:creator>John</dc:creator>
				<category><![CDATA[classification of relays]]></category>
		<category><![CDATA[Power System]]></category>
		<category><![CDATA[Relays]]></category>
		<category><![CDATA[Switchgear&Protection]]></category>
		<category><![CDATA[advantageous over electromagnetic differential relays]]></category>
		<category><![CDATA[STATIC DIFFERENTIAL RELAY]]></category>
		<category><![CDATA[static differential relays]]></category>

		<guid isPermaLink="false">http://electricalandelectronics.org/?p=1410</guid>
		<description><![CDATA[The differential relay measures the phasor difference between two similar electrical quantities(voltage-voltage or current-current). The block diagram for such a relay is shown in fig 24. Inputs I and II are supplied to the comparator. The output of the comparator (phase difference of inputs I and II) is amplified and used to operate the relay. [...]]]></description>
		<wfw:commentRss>http://www.circuitmaniac.com/2009/03/17/static-differential-relay/feed/</wfw:commentRss>
		<slash:comments>1</slash:comments>
		</item>
		<item>
		<title>STATIC DIRECTIONAL RELAY</title>
		<link>http://www.circuitmaniac.com/2009/03/17/static-directional-relay/</link>
		<comments>http://www.circuitmaniac.com/2009/03/17/static-directional-relay/#comments</comments>
		<pubDate>Tue, 17 Mar 2009 17:42:26 +0000</pubDate>
		<dc:creator>John</dc:creator>
				<category><![CDATA[classification of relays]]></category>
		<category><![CDATA[Power System]]></category>
		<category><![CDATA[Relays]]></category>
		<category><![CDATA[Switchgear&Protection]]></category>
		<category><![CDATA[relay characteristic angle]]></category>
		<category><![CDATA[STATIC DIRECTIONAL RELAY]]></category>

		<guid isPermaLink="false">http://electricalandelectronics.org/?p=1407</guid>
		<description><![CDATA[For obvious reasons of obtaining selectivity over-current relays are made directional. 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 [...]]]></description>
		<wfw:commentRss>http://www.circuitmaniac.com/2009/03/17/static-directional-relay/feed/</wfw:commentRss>
		<slash:comments>0</slash:comments>
		</item>
		<item>
		<title>STATIC OVER CURRENT RELAY</title>
		<link>http://www.circuitmaniac.com/2009/03/17/static-over-current-relay/</link>
		<comments>http://www.circuitmaniac.com/2009/03/17/static-over-current-relay/#comments</comments>
		<pubDate>Tue, 17 Mar 2009 17:27:51 +0000</pubDate>
		<dc:creator>John</dc:creator>
				<category><![CDATA[classification of relays]]></category>
		<category><![CDATA[Power System]]></category>
		<category><![CDATA[Relays]]></category>
		<category><![CDATA[Switchgear&Protection]]></category>
		<category><![CDATA[Static instantaneous Over-Current Relay]]></category>
		<category><![CDATA[STATIC OVER CURRENT RELAY]]></category>
		<category><![CDATA[Static Over-Current time Relay]]></category>

		<guid isPermaLink="false">http://electricalandelectronics.org/?p=1401</guid>
		<description><![CDATA[The over-current relays, even though simplest of all types of electro-mechanical relays, are the most difficult static relays. Static over current relays are of two types: (i) Instantaneous over-current relays and (ii) Time over-current relay. Static instantaneous Over-Current Relay The block diagram of an instantaneous over-current relay is shown in fig 21. The same construction [...]]]></description>
		<wfw:commentRss>http://www.circuitmaniac.com/2009/03/17/static-over-current-relay/feed/</wfw:commentRss>
		<slash:comments>3</slash:comments>
		</item>
		<item>
		<title>STATIC RELAYS</title>
		<link>http://www.circuitmaniac.com/2009/03/17/static-relays/</link>
		<comments>http://www.circuitmaniac.com/2009/03/17/static-relays/#comments</comments>
		<pubDate>Tue, 17 Mar 2009 17:15:13 +0000</pubDate>
		<dc:creator>John</dc:creator>
				<category><![CDATA[classification of relays]]></category>
		<category><![CDATA[Power System]]></category>
		<category><![CDATA[Relays]]></category>
		<category><![CDATA[Switchgear&Protection]]></category>
		<category><![CDATA[basic static relay]]></category>
		<category><![CDATA[electromagnetic relay]]></category>
		<category><![CDATA[static relay]]></category>

		<guid isPermaLink="false">http://electricalandelectronics.org/?p=1398</guid>
		<description><![CDATA[A static relay refers to a relay in which there is no armature or other moving element and response is developed by electronic, magnetic and other components without mechanical motion. The solid-state components used are transistors, diodes, resistors, capacitors and so on. Static circuits accomplish the function of comparison and measurement. A relay using combination [...]]]></description>
		<wfw:commentRss>http://www.circuitmaniac.com/2009/03/17/static-relays/feed/</wfw:commentRss>
		<slash:comments>4</slash:comments>
		</item>
		<item>
		<title>NEGATIVE PHASE SEQUENCE RELAY</title>
		<link>http://www.circuitmaniac.com/2009/03/17/negative-phase-sequence-relay/</link>
		<comments>http://www.circuitmaniac.com/2009/03/17/negative-phase-sequence-relay/#comments</comments>
		<pubDate>Tue, 17 Mar 2009 14:46:21 +0000</pubDate>
		<dc:creator>John</dc:creator>
				<category><![CDATA[classification of relays]]></category>
		<category><![CDATA[Power System]]></category>
		<category><![CDATA[Relays]]></category>
		<category><![CDATA[Switchgear&Protection]]></category>
		<category><![CDATA[NEGATIVE PHASE SEQUENCE RELAY]]></category>
		<category><![CDATA[positive phase sequence relay]]></category>
		<category><![CDATA[single pole relay]]></category>
		<category><![CDATA[zero phase sequence relay]]></category>

		<guid isPermaLink="false">http://electricalandelectronics.org/?p=1391</guid>
		<description><![CDATA[Whenever there is an unbalance in circuit, the unbalanced currents will have a negative phase sequence component. A negative phase sequence (or phase unbalance) relay is essentially provided for the protection of generators and motors against unbalanced loading that may arise due to phase-to-phase faults. Such relay has a filter circuit, which is responsive only [...]]]></description>
		<wfw:commentRss>http://www.circuitmaniac.com/2009/03/17/negative-phase-sequence-relay/feed/</wfw:commentRss>
		<slash:comments>3</slash:comments>
		</item>
		<item>
		<title>VOLTAGE DIFFERENTIAL RELAY</title>
		<link>http://www.circuitmaniac.com/2009/03/17/voltage-differential-relay/</link>
		<comments>http://www.circuitmaniac.com/2009/03/17/voltage-differential-relay/#comments</comments>
		<pubDate>Tue, 17 Mar 2009 11:53:39 +0000</pubDate>
		<dc:creator>John</dc:creator>
				<category><![CDATA[classification of relays]]></category>
		<category><![CDATA[Power System]]></category>
		<category><![CDATA[Relays]]></category>
		<category><![CDATA[Switchgear&Protection]]></category>
		<category><![CDATA[relay operating coil]]></category>
		<category><![CDATA[Voltage balance protection]]></category>
		<category><![CDATA[VOLTAGE DIFFERENTIAL RELAY]]></category>

		<guid isPermaLink="false">http://electricalandelectronics.org/?p=1388</guid>
		<description><![CDATA[Fig. 18 shows the arrangement of voltage balance protection. In this scheme of protection, two similar current transformers are connected at either end of the element to be protected (e.g. an alternator winding) by means of pilot of wires. The secondaries of current transformers are connected in series with a relay in such a way [...]]]></description>
		<wfw:commentRss>http://www.circuitmaniac.com/2009/03/17/voltage-differential-relay/feed/</wfw:commentRss>
		<slash:comments>0</slash:comments>
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