Lagging/Leading PF - Lagging/Leading Q - Positive/Negative Q - Electronic Circuits Projects Diagrams Free

powersys · 10th January 2006, 06:38 AM

Could someone show me the relationship, if any, withing the following terms:

Lagging/Leading Power Factor (PF)
Lagging/Leading Reactive Power (Q)
Positive/Negative Reactive Power (Q)

Can I say that Lagging PF = Lagging Q = Positive Q?

Thanks.

Russlk · 11th January 2006, 04:56 AM

As I have stated before, power factor is just another way to state the phase angle. PF = COS(theta) since COS is always positive, unless you get into the 3rd or 4th quadrant, which is not possible, the PF is always positive.

Q = SIN(theta) * VA and is the reactive power. Since leading phase is considered positive and sin of positive angle is positive, then Q for a capacitive load is positive. By similar reasoning, Q for an inductive load is negative.

OK?

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10th January 2006, 06:38 AM	#1
powersys	Lagging/Leading PF - Lagging/Leading Q - Positive/Negative Q Could someone show me the relationship, if any, withing the following terms: Lagging/Leading Power Factor (PF) Lagging/Leading Reactive Power (Q) Positive/Negative Reactive Power (Q) Can I say that Lagging PF = Lagging Q = Positive Q? Thanks.

11th January 2006, 04:56 AM	#2
Russlk	As I have stated before, power factor is just another way to state the phase angle. PF = COS(theta) since COS is always positive, unless you get into the 3rd or 4th quadrant, which is not possible, the PF is always positive. Q = SIN(theta) * VA and is the reactive power. Since leading phase is considered positive and sin of positive angle is positive, then Q for a capacitive load is positive. By similar reasoning, Q for an inductive load is negative. OK? __________________ see my website: www.geocities.com/russlk