Power Factor Of The Most Common Loads

Jan 08, 2018

Please refer to following table for the power factor of the most common loads

Device	Load	cos φ	tg φ
Ordinary asynchronous motor	0%	0.17	5.8
	25%	0.55	1.52
	50%	0.73	0.94
	75%	0.8	0.75
	100%	0.85	0.62
Incandescent lamps		1	0
Fluorescent lamps		0.5	1.73
Discharge lamps		0.4 to 0.6	2.29 to 1.33
Resistance furnaces		1	0
Induction furnaces		0.85	0.62
Dielectric heating furnaces		0.85	0.62
Resistance welding machine		0.8 to 0.9	0.75 to 0.48
Single-phase static arc-welding centres		0.5	1.73
Rotary arc-welding sets		0.7 to 0.9	1.02
Arc-welding transformers/rectifiers		0.7 to 0.9	1.02 to 0.75
Arc furnaces		0.8	0.75