Undervoltage Relay Settings

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coolyaar Power-User Join Date: Jul 2011 Posts: 286 Good Answers: 1	Undervoltage Relay Settings 08/10/2011 11:51 AM
	i have the undervoltage relay X2U-AC from woodward containing various settings e.g. trip voltage and trip time delay . there are dipswitches for settings the value of a parameter called hysterisis which can be set to 3% or 6% or 10% . now what does this parameter mean , what are its affects on network and to which value should i set it ?
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JRaef Guru Join Date: Sep 2006 Location: California, USA, where the Godless live next door to God. Posts: 4665 Good Answers: 804	#1 Re: undervoltage relay settings 08/10/2011 11:59 AM
	Hysterisis in this context would be the difference between the trip threshold and the reset threshold. So let's say it is a 400V system and you want to trip off at 350V. If you set the hysterisis for 10%, you will be unable to reset it until the voltage returns to at least 385V (350 x 1.10). This prevents rapid cycling of the system. What you set the UV trip threshold is an engineering function that involves investigating the voltage tolerances of the equipment being fed by this system. __________________ All I every really wanted to be, was... A LUMBERJACK!.
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kvsridhar Guru Join Date: Sep 2009 Location: Temporarily at Ashburn, VA Posts: 2744 Good Answers: 164	#2 In reply to #1 Re: undervoltage relay settings 08/10/2011 12:10 PM
	GA i admire your patience in replying well despite the questionable history of the OP ! __________________ Nothing worthwhile can ever be taught, it can only be learnt.
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JRaef Guru Join Date: Sep 2006 Location: California, USA, where the Godless live next door to God. Posts: 4665 Good Answers: 804	#3 In reply to #2 Re: undervoltage relay settings 08/10/2011 12:29 PM
	It was for the greater good (although I'm not as sure of the assessment of the OP as others are, kind hearted curmudgeon that I am sometimes). Other people read these threads when they do a keyword search, acrimony* will have no value to them. ^{( Although I hasten to admit my share of acrimony in this forum as well, I am trying to be kinder and gentler...)}* __________________ All I every really wanted to be, was... A LUMBERJACK!.
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kvsridhar Guru Join Date: Sep 2009 Location: Temporarily at Ashburn, VA Posts: 2744 Good Answers: 164	#4 In reply to #3 Re: undervoltage relay settings 08/10/2011 1:06 PM
	You are right about the 'collateral benefit'. i am an example am i not ? So, keep it up ... more power to you..... __________________ Nothing worthwhile can ever be taught, it can only be learnt.
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brich Guru Join Date: Oct 2009 Location: sometimes Wales,UK.. was Libya, now Oman! Posts: 1715 Good Answers: 117	#5 In reply to #2 Re: undervoltage relay settings 08/10/2011 11:23 PM
	Hear, Hear.. I second that! It's as if this guy want his education for free!! __________________ The square root of nothing is what you make it!
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