Page 224 - Power Quality in Electrical Systems
P. 224
206 Chapter Fourteen
Power
supply Power
Current quality
transf. A/D analyser
card
VDU
Furnace Voltage
transf. transf.
Signal Power
Arc compen- calc.
furnace sator
Figure 14.5 A block diagram of a power-quality analyzer
[14.4].
[© 1997, IEEE, reprinted with permission]
– 8.68
– 8.07
– 8.07
– 8.06
5.000 A/div 5.000 A/div 2 cycles
(a)
100.00
75.00 3 order
50.38 Z
50.00
2.5 order
0.67 I
25.00
[Z]
1 10 20 30 40 50
(b)
Figure 14.6 Power-quality analyzer measurements on a Xerox machine [14.5]. (a) Line
current (b) Spectrum.
[© 2004, IEEE, reprinted with permission]
