<?xml version="1.0" encoding="UTF-8"?>
<rss version="2.0"
	xmlns:content="http://purl.org/rss/1.0/modules/content/"
	xmlns:wfw="http://wellformedweb.org/CommentAPI/"
	xmlns:dc="http://purl.org/dc/elements/1.1/"
	xmlns:atom="http://www.w3.org/2005/Atom"
	xmlns:sy="http://purl.org/rss/1.0/modules/syndication/"
	xmlns:slash="http://purl.org/rss/1.0/modules/slash/"
	>

<channel>
	<title>circuitmaniac.com &#187; Switchgear&amp;Protection</title>
	<atom:link href="http://www.circuitmaniac.com/category/power-system/switchgearprotection/feed/" rel="self" type="application/rss+xml" />
	<link>http://www.circuitmaniac.com</link>
	<description>the complete electronic web portal</description>
	<lastBuildDate>Mon, 21 Nov 2011 18:35:03 +0000</lastBuildDate>
	<language>en</language>
	<sy:updatePeriod>hourly</sy:updatePeriod>
	<sy:updateFrequency>1</sy:updateFrequency>
	<generator>http://wordpress.org/?v=3.3.2</generator>
<xhtml:meta xmlns:xhtml="http://www.w3.org/1999/xhtml" name="robots" content="noindex" />
		<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>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>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>
	</channel>
</rss>

