Practical values of power factor: Difference between revisions

Revision as of 10:38, 30 December 2016

(see Fig. L6)

Equipment and appliances				cos φ	tan φ
Motor	Common induction motor	loaded at	0 %	0.17	5.80
			25%	0.55	1.52
			50 %	0.73	0.94
			75 %	0.80	0.75
			100 %	0.85	0.62
Lamps	Incandescent lamps			1.0	0
	Fluorescent lamps (uncompensated)			0.5	1.73
	Fluorescent lamps (compensated)			0.93	0.39
	Discharge lamps			0.4 to 0.6	2.29 to 1.33
Ovens	Ovens using resistance elements			1.0	0
	Induction heating ovens (compensated)			0.85	0.62
	Dielectric type heating ovens			0.85	0.62
Welding	Resistance-type soldering machines			0.8 to 0.9	0.75 to 0.48
	Fixed 1-phase arc-welding set			0.5	1.73
	Arc-welding motor-generating set			0.7 to 0.9	1.02 to 0.48
	Arc-welding transformer-rectifier set			0.7 to 0.8	1.02 to 0.75
Arc furnace				0.8	0.75

Fig. L6 – Values of cos φ and tan φ for commonly-used equipment

@@ Line 33: / Line 33: @@
 | 0.4 to 0.6  || 2.29 to 1.33
 |-
-| rowspan="4" |Ovens
+| rowspan="3" |Ovens
 | colspan="3" |Ovens using resistance elements
 | 1.0  || 0
@@ Line 42: / Line 42: @@
 | colspan="3" |Dielectric type heating ovens
 | 0.85  || 0.62
-|-
-| colspan="3" |Arc furnace
-|0.8
-|0.75
 |-
 | rowspan="4" |Welding
@@ Line 59: / Line 55: @@
 | colspan="3" |Arc-welding transformer-rectifier set
 | 0.7 to 0.8  || 1.02 to 0.75
+|-
+| colspan="4" |Arc furnace
+|0.8
+|0.75
 |-
 {{TableEnd|Tab1331|L6|Values of cos φ  and tan φ for commonly-used equipment}}