Relationship Between Voltage Drop and Power Factor

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jigusparmar Member Join Date: Sep 2010 Location: Gandhinagar,India Posts: 9	Relationship Between Voltage Drop and Power Factor 05/26/2011 3:28 AM
	Require Guidance for Cable Voltage Drop with respect to P.F: % Voltage drop = (1.732X Full Load CurrentX Length (Km)X(Rcos@+Jsin@)X100 )/ (Volt X No of Run) Ex. For 1.6KM , 50Amp,cos@=0.8,Sin@=0.6, R=0.41Ohm/Km, j=0.074Ohm/Km % V.D =12% But if P.F will increase and goes to 0.9 (Cos@=0.9) than % V.D is 13.40%. so if System has Good P.F than You have more Voltage drop..If we installed Capacitor Bank to minimise KVAR hece to improve P.F will increase V.D in System..
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loadshare Power-User Join Date: Jan 2011 Location: Jakarta Posts: 162	#1 Re: Relasionship between Voltage drop and Power Factor 05/26/2011 4:14 AM
	Hi, I better look cable manufacture catalog to find the voltage drop than calculate. __________________ One system
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kvsridhar Guru Join Date: Sep 2009 Location: Temporarily at Ashburn, VA Posts: 2744 Good Answers: 164	#2 Re: Relasionship between Voltage drop and Power Factor 05/26/2011 5:18 AM
	Doesn't seem logical does it? When the pf is 1, the current is the least. It goes up as the pf comes down. The voltage drop depends directly on the current for a given set of conditions. How can it go up as the current goes down? __________________ Nothing worthwhile can ever be taught, it can only be learnt.
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Vinu_Answers Commentator Join Date: Mar 2011 Location: Noida, (U.P.), India. Posts: 99 Good Answers: 6	#3 Re: Relasionship between Voltage drop and Power Factor 05/26/2011 5:38 AM
	Single phase voltage drop: Vd = 2K x L x I / Cm or Cm = 2K x L x I / Vd For both examples: Vd = voltage drop, K= 12.9 for resistance for a copper conductor, L = length of circuit in ft., I = current or amps of the load, Cm = area of the conductor in Circular Mills. Three phase voltage drop: Vd = 1.73K x L x I / Cm or Cm = 1.73K x L x I / Vd 1 square mm = 1973.52524139 Cm or Circular Mill __________________ Sure Answers Always
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Anonymous Poster #1	#4 In reply to #3 Re: Relasionship between Voltage drop and Power Factor 05/26/2011 6:09 AM
	What has this got to do with the OP???
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electricalexpert65 Guru Join Date: Oct 2009 Posts: 2061 Good Answers: 169	#5 Re: Relasionship between Voltage drop and Power Factor 05/26/2011 7:36 AM
	I fully agree with KVS. When the power factor has improved from 0.8 to 0.9, then definitely the current thro the cable also MUST have reduced from 50 Amps to a lesser value. I think, in your case, you have taken the current as 50 Amps in both the cases.
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Anonymous Poster (1); electricalexpert65 (1); kvsridhar (1); loadshare (1); Vinu_Answers (1)

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