Distance Protection(21)

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amitabha0107 Power-User Join Date: Feb 2011 Location: Shimurali, Westbengal,India Posts: 119	Distance Protection(21) 08/02/2011 2:15 AM
	for distance protection using Areva make Micom P444 relay - 1> the zones(1-2-3-P-4) are parallilopiped shape. what is the requirement of zone-P and how R_max and X_max settings are calulated? 2> Is it directional distance protection i.e. mho type? 3> what is memory polarisation and cross polarisaion? in P444 what type of polarisation use?
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Anonymous Poster #1	#1 Re: Distance protection(21) 08/02/2011 2:17 AM
	No hablo inglés.
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TonyS Guru Join Date: Aug 2010 Location: Resting under the Major Oak Posts: 4347 Good Answers: 181	#2 Re: Distance protection(21) 08/02/2011 4:23 AM
	Try asking the question again giving some reference to the acronyms you have used. Your post is total gibberish as it is. __________________ The reports of my death are greatly exaggerated.
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PeterT Guru Join Date: May 2010 Location: Liverpool, NY Posts: 961 Good Answers: 131	#4 In reply to #2 Re: Distance protection(21) 08/04/2011 1:18 PM
	Sorry TonyS, but the OP's questions were pretty clear and unambiguous with respect to transmission line protection relays of the zone-distance or impedance type. Yes, it can seem like gibberish, but he wasn't like many posters who use abbreviations and acronyms, presented in fractured English or even text-speak. Unfortunately, my own experience is only enough to know that his question is clear, but not enough to give him a worthwhile answer. __________________ To get the right answers, first you need to ask the right questions.
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Anonymous Poster #2	#3 Re: Distance Protection(21) 08/02/2011 7:52 AM
	http://www.bing.com/search?q=Micom+P444+&src=IE-SearchBox&Form=IE8SRC
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PeterT Guru Join Date: May 2010 Location: Liverpool, NY Posts: 961 Good Answers: 131	#5 Re: Distance Protection(21) 08/05/2011 9:17 AM
	If you have to ask these questions, you are not qualified to program the settings for this relay. You need a course in transmission line protective relaying. I will give you what direction I can on your questions, but you have some research & study to do. There is some good info here: http://store.gedigitalenergy.com/FAQ/Documents/L90/GER-3966.pdf 1. Zone P is programmable if you want an additional forward or reverse zone beyond the standard 3 forward and 1 reverse. The relay manual (link give by another poster) will explain its range and parameters. R and X settings are calculated based on your transmission line and fault parameters, just as you would for zones 1-3. 2. It is a quadrilateral distance-type relay. Mho-distance has a circular zone characteristic. Check out this link: http://power-systems-protection.blogspot.com/2011/01/quadrilateral-characteristics.html 3. I'm not familiar enough with this relay to have any input here. The manual should tell you. Good luck! __________________ To get the right answers, first you need to ask the right questions.
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