Page 243 - Power Quality in Electrical Systems

Index 225

Voltage compensators, dynamic VRLA (Valve-regulated lead-acid)
(see Dynamic voltage compensators) batteries, 139
Voltage dip (see Sags) VSS (Voltage support system), 136
Voltage distortion, 25–42
flicker, 39–40 Waveform(s):
impulsive transients, 30–33 DC, 50
interruptions, 35 ideal voltage, 2–3
limits of, 16 periodic, 43–52
notching, 35–38 pulsating, 51–52
oscillatory transients, 33–35 pulsating, with ripples, 52
Voltage disturbances (see Disturbances) pure sine wave, 45, 49
Voltage fluctuations, 8–9, 37, 39–40 sine wave, 49
Voltage imbalance, 9, 40–42 single-phase, 2, 3
Voltage regulators, 197 square, 43, 45, 49, 50, 53
Voltage sags (see Sags) trapezoidal, 46
Voltage support system (VSS), 136 triangle, 44, 45, 52
Voltage swells (see Swells) Waveform distortion, 42
Voltage unbalance, 181–183 Wye-delta secondary windings, 121
Voltage waveforms, ideal, 2–3
Voltage-doubler diode rectifiers, 148 Zener diodes, 7