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	<title>circuitmaniac.com &#187; Feeder protection</title>
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		<item>
		<title>TRANSLAY SCHEME  FOR FEEDER PROTECTION</title>
		<link>http://www.circuitmaniac.com/2009/03/25/translay-scheme-for-feeder-protection/</link>
		<comments>http://www.circuitmaniac.com/2009/03/25/translay-scheme-for-feeder-protection/#comments</comments>
		<pubDate>Wed, 25 Mar 2009 21:32:34 +0000</pubDate>
		<dc:creator>John</dc:creator>
				<category><![CDATA[Feeder protection]]></category>
		<category><![CDATA[Power System]]></category>
		<category><![CDATA[Switchgear&Protection]]></category>
		<category><![CDATA[ADVANTAGES OF TRANSLAY SCHEME]]></category>
		<category><![CDATA[OPERATION OF TRANSLAY SYSTEM]]></category>
		<category><![CDATA[SCHEMATIC DIAGRAM OF TRANSLAY SCHEME]]></category>
		<category><![CDATA[TRANSLAY SCHEME  FOR FEEDER PROTECTION]]></category>

		<guid isPermaLink="false">http://electricalandelectronics.org/?p=1576</guid>
		<description><![CDATA[This system is similar to voltage balance system except that here balance or opposition is between the voltages induced in the secondary windings wound on the relay magnet and not between the secondary voltages of the line current transformers. This permits to use current transformers of normal design and eliminates one of the most serious [...]]]></description>
		<wfw:commentRss>http://www.circuitmaniac.com/2009/03/25/translay-scheme-for-feeder-protection/feed/</wfw:commentRss>
		<slash:comments>2</slash:comments>
		</item>
		<item>
		<title>MERZ-PRICE VOLTAGE BALANCE SYSTEM  FOR FEEDER PROTECTION</title>
		<link>http://www.circuitmaniac.com/2009/03/25/merz-price-voltage-balance-system-for-feeder-protection/</link>
		<comments>http://www.circuitmaniac.com/2009/03/25/merz-price-voltage-balance-system-for-feeder-protection/#comments</comments>
		<pubDate>Wed, 25 Mar 2009 20:27:34 +0000</pubDate>
		<dc:creator>John</dc:creator>
				<category><![CDATA[Feeder protection]]></category>
		<category><![CDATA[Power System]]></category>
		<category><![CDATA[Switchgear&Protection]]></category>
		<category><![CDATA[ADVANTAGES OF  MERZ-PRICE VOLTAGE BALANCE SYSTEM]]></category>
		<category><![CDATA[DISADVANTAGES OF  MERZ-PRICE VOLTAGE BALANCE SYSTEM]]></category>
		<category><![CDATA[MERZ-PRICE VOLTAGE BALANCE SYSTEM  FOR FEEDER PROTECTION]]></category>

		<guid isPermaLink="false">http://electricalandelectronics.org/?p=1571</guid>
		<description><![CDATA[Figure shows the single line diagram of Merz Price voltage balance system for the protection of 3-phse line. Identical current transformers are placed in each phase at both ends of the line. The pair of CTs in each line is connected in series with a relay in such a way that under normal conditions, their [...]]]></description>
		<wfw:commentRss>http://www.circuitmaniac.com/2009/03/25/merz-price-voltage-balance-system-for-feeder-protection/feed/</wfw:commentRss>
		<slash:comments>2</slash:comments>
		</item>
		<item>
		<title>DIFFERENTIAL PILOT-WIRE PROTECTION</title>
		<link>http://www.circuitmaniac.com/2009/03/25/differential-pilot-wire-protection/</link>
		<comments>http://www.circuitmaniac.com/2009/03/25/differential-pilot-wire-protection/#comments</comments>
		<pubDate>Wed, 25 Mar 2009 20:09:47 +0000</pubDate>
		<dc:creator>John</dc:creator>
				<category><![CDATA[Feeder protection]]></category>
		<category><![CDATA[Power System]]></category>
		<category><![CDATA[Switchgear&Protection]]></category>
		<category><![CDATA[DIFFERENTIAL PILOT-WIRE PROTECTION]]></category>
		<category><![CDATA[Merz-Price voltage balance system]]></category>
		<category><![CDATA[Translay scheme]]></category>

		<guid isPermaLink="false">http://electricalandelectronics.org/?p=1569</guid>
		<description><![CDATA[The differential pilot-wire protection is based on the principle that under normal conditions, the current entering one end of a line is equal to that leaving the other end. As soon as a fault occurs between the two ends this condition no longer holds and the difference of incoming and outgoing currents is arranged to [...]]]></description>
		<wfw:commentRss>http://www.circuitmaniac.com/2009/03/25/differential-pilot-wire-protection/feed/</wfw:commentRss>
		<slash:comments>3</slash:comments>
		</item>
		<item>
		<title>TIME GRADED OVER CURRENT PROTECTION IN RING MAIN SYSTEM</title>
		<link>http://www.circuitmaniac.com/2009/03/24/time-graded-over-current-protection-in-ring-main-system/</link>
		<comments>http://www.circuitmaniac.com/2009/03/24/time-graded-over-current-protection-in-ring-main-system/#comments</comments>
		<pubDate>Tue, 24 Mar 2009 21:26:29 +0000</pubDate>
		<dc:creator>John</dc:creator>
				<category><![CDATA[Feeder protection]]></category>
		<category><![CDATA[Power System]]></category>
		<category><![CDATA[Switchgear&Protection]]></category>
		<category><![CDATA[ring main system]]></category>
		<category><![CDATA[TIME GRADED OVER CURRENT PROTECTION IN RING MAIN SYSTEM]]></category>

		<guid isPermaLink="false">http://electricalandelectronics.org/?p=1566</guid>
		<description><![CDATA[Ring main system &#8211; In this system, various power stations or sub-stations are interconnected alternate routes, thus forming a closed ring. In case of damage to any section of the ring, that section may be disconnected for repairs and power will be supplied from both ends of the ring, thereby maintaining continuity of supply Fig [...]]]></description>
		<wfw:commentRss>http://www.circuitmaniac.com/2009/03/24/time-graded-over-current-protection-in-ring-main-system/feed/</wfw:commentRss>
		<slash:comments>26</slash:comments>
		</item>
		<item>
		<title>TIME GRADED OVER CURRENT PROTECTION IN PARALLEL FEEDERS</title>
		<link>http://www.circuitmaniac.com/2009/03/24/time-graded-over-current-protection-in-parallel-feeders/</link>
		<comments>http://www.circuitmaniac.com/2009/03/24/time-graded-over-current-protection-in-parallel-feeders/#comments</comments>
		<pubDate>Tue, 24 Mar 2009 20:38:42 +0000</pubDate>
		<dc:creator>John</dc:creator>
				<category><![CDATA[Feeder protection]]></category>
		<category><![CDATA[Power System]]></category>
		<category><![CDATA[Switchgear&Protection]]></category>
		<category><![CDATA[PARALLEL FEEDER]]></category>
		<category><![CDATA[TIME GRADED OVER CURRENT PROTECTION IN PARALLEL FEEDERS]]></category>

		<guid isPermaLink="false">http://electricalandelectronics.org/?p=1562</guid>
		<description><![CDATA[PARALLEL FEEDER &#8211; Where continuity of supply is particularly necessary, two parallel feeders may be installed. If a fault occurs on one feeder, it can be disconnected from the system and continuity of supply can be maintained from the other feeder. The parallel feeder cannot be protected by non directional relay over current relays only. [...]]]></description>
		<wfw:commentRss>http://www.circuitmaniac.com/2009/03/24/time-graded-over-current-protection-in-parallel-feeders/feed/</wfw:commentRss>
		<slash:comments>7</slash:comments>
		</item>
		<item>
		<title>TIME GRADED OVER CURRENT PROTECTION IN RADIAL FEEDERS</title>
		<link>http://www.circuitmaniac.com/2009/03/24/time-graded-over-current-protection-in-radial-feeders/</link>
		<comments>http://www.circuitmaniac.com/2009/03/24/time-graded-over-current-protection-in-radial-feeders/#comments</comments>
		<pubDate>Tue, 24 Mar 2009 20:08:15 +0000</pubDate>
		<dc:creator>John</dc:creator>
				<category><![CDATA[Feeder protection]]></category>
		<category><![CDATA[Power System]]></category>
		<category><![CDATA[Switchgear&Protection]]></category>
		<category><![CDATA[definte time relay]]></category>
		<category><![CDATA[inverse time relay]]></category>
		<category><![CDATA[radial feeder]]></category>
		<category><![CDATA[TIME GRADED OVER CURRENT PROTECTION IN RADIAL FEEDERS]]></category>

		<guid isPermaLink="false">http://electricalandelectronics.org/?p=1558</guid>
		<description><![CDATA[In this type of protection time settings of relays is so graded that in the event of fault, the smallest possible part of the system is isolated. Following are the important cases. RADIAL FEEDER The main characteristics of this system is that power can flow only one direction, from generator or supply end to the [...]]]></description>
		<wfw:commentRss>http://www.circuitmaniac.com/2009/03/24/time-graded-over-current-protection-in-radial-feeders/feed/</wfw:commentRss>
		<slash:comments>1</slash:comments>
		</item>
		<item>
		<title>CARRIER CURRENT PROTECTION</title>
		<link>http://www.circuitmaniac.com/2009/03/22/carrier-current-protection/</link>
		<comments>http://www.circuitmaniac.com/2009/03/22/carrier-current-protection/#comments</comments>
		<pubDate>Sun, 22 Mar 2009 20:30:51 +0000</pubDate>
		<dc:creator>John</dc:creator>
				<category><![CDATA[Feeder protection]]></category>
		<category><![CDATA[Power System]]></category>
		<category><![CDATA[Switchgear&Protection]]></category>
		<category><![CDATA[auxiliary relay]]></category>
		<category><![CDATA[CARRIER CURRENT PROTECTION]]></category>
		<category><![CDATA[carrier current-pilot protection]]></category>
		<category><![CDATA[carrier-currents]]></category>
		<category><![CDATA[microwave pilot wire protection]]></category>
		<category><![CDATA[power-frequency currents]]></category>
		<category><![CDATA[transmitter]]></category>

		<guid isPermaLink="false">http://electricalandelectronics.org/?p=1548</guid>
		<description><![CDATA[In this type of protection, transmission lines are used to carry protective currents at carrier frequency (30 to 200 kc/s) or at an ultra high frequency (above 900 mega cycles). When the transmission lines carry protective currents at carrier frequency it is called carrier current-pilot protection and when it carries protective current at ultra high [...]]]></description>
		<wfw:commentRss>http://www.circuitmaniac.com/2009/03/22/carrier-current-protection/feed/</wfw:commentRss>
		<slash:comments>2</slash:comments>
		</item>
		<item>
		<title>PHASE AND EARTH FAULT PROTECTION USING IMPEDANCE RELAY</title>
		<link>http://www.circuitmaniac.com/2009/03/22/phase-and-earth-fault-protection-using-impedance-relay/</link>
		<comments>http://www.circuitmaniac.com/2009/03/22/phase-and-earth-fault-protection-using-impedance-relay/#comments</comments>
		<pubDate>Sun, 22 Mar 2009 20:10:51 +0000</pubDate>
		<dc:creator>John</dc:creator>
				<category><![CDATA[Feeder protection]]></category>
		<category><![CDATA[Power System]]></category>
		<category><![CDATA[Switchgear&Protection]]></category>
		<category><![CDATA[distance impedance relay]]></category>
		<category><![CDATA[PHASE AND EARTH FAULT PROTECTION USING IMPEDANCE RELAY]]></category>
		<category><![CDATA[transfer relay]]></category>

		<guid isPermaLink="false">http://electricalandelectronics.org/?p=1545</guid>
		<description><![CDATA[The distance impedance relays are normally used for phase- to-phase faults as for such faults the loop impedance between the phase is obtained which remains constant, but in case of earth fault the loop impedance consists of impedance of one line and the impedance of the earth fault which is a variable factor. Practically it [...]]]></description>
		<wfw:commentRss>http://www.circuitmaniac.com/2009/03/22/phase-and-earth-fault-protection-using-impedance-relay/feed/</wfw:commentRss>
		<slash:comments>2</slash:comments>
		</item>
		<item>
		<title>TIME DISTANCE PROTECTION</title>
		<link>http://www.circuitmaniac.com/2009/03/22/time-distance-protection/</link>
		<comments>http://www.circuitmaniac.com/2009/03/22/time-distance-protection/#comments</comments>
		<pubDate>Sun, 22 Mar 2009 20:01:19 +0000</pubDate>
		<dc:creator>John</dc:creator>
				<category><![CDATA[Feeder protection]]></category>
		<category><![CDATA[Power System]]></category>
		<category><![CDATA[Switchgear&Protection]]></category>
		<category><![CDATA[circuit breaker]]></category>
		<category><![CDATA[generating station]]></category>
		<category><![CDATA[power station]]></category>
		<category><![CDATA[TIME DISTANCE PROTECTION]]></category>
		<category><![CDATA[time distance relay]]></category>

		<guid isPermaLink="false">http://electricalandelectronics.org/?p=1541</guid>
		<description><![CDATA[When a generating station supplies to three sub-stations radially, it is desired to isolate all those sub-stations beyond the fault point. This can be achieved by the use of time delayed over current relay but the main disadvantage is that if the fault is near the power station it will take much longer time to [...]]]></description>
		<wfw:commentRss>http://www.circuitmaniac.com/2009/03/22/time-distance-protection/feed/</wfw:commentRss>
		<slash:comments>0</slash:comments>
		</item>
		<item>
		<title>DEFINITE DISTANCE PROTECTION</title>
		<link>http://www.circuitmaniac.com/2009/03/22/definite-distance-protection/</link>
		<comments>http://www.circuitmaniac.com/2009/03/22/definite-distance-protection/#comments</comments>
		<pubDate>Sun, 22 Mar 2009 17:49:31 +0000</pubDate>
		<dc:creator>John</dc:creator>
				<category><![CDATA[Feeder protection]]></category>
		<category><![CDATA[Power System]]></category>
		<category><![CDATA[Switchgear&Protection]]></category>
		<category><![CDATA[DEFINITE DISTANCE PROTECTION]]></category>

		<guid isPermaLink="false">http://electricalandelectronics.org/?p=1538</guid>
		<description><![CDATA[This relay operates at a constant time for all faults independent of the distance of occurrence of fault. For its application consider Fig 10 which represents a power station feeding transforming sub-station. The power transformer is protected independently by inverse-time over current relay. Let, it be required to provide a relay at the input side [...]]]></description>
		<wfw:commentRss>http://www.circuitmaniac.com/2009/03/22/definite-distance-protection/feed/</wfw:commentRss>
		<slash:comments>2</slash:comments>
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