Introduction to Electrical Power and Power Electronics

436 Introduction to Electrical Power and Power Electronics

Using Equation 16.2, the voltage drop in an impedance is given fairly accu-

rately at all practical power factors by R cos θ + X sin θ volts per phase per ampere.

For this machine,

V

drop

5853

5V

/ph=×+×−=0000 00 1085 0 0227

2

.....aaseper ampere.

Therefore, voltage drop = 1203 × 0.0227 = 27.3 V/phase or √3 × 27.3 = 47.3 V

LL

.

Terminal line voltage = 520 – 47.3 = 472.7 V.

16.3 HARMONICS

The utility power source is primarily sinusoidal, with one dominant frequency called

the fundamental frequency, which is 60 or 50 Hz. Harmonics is the term used to

describe higher-frequency sinusoids superimposed ...