Page 132 - Power Quality in Electrical Systems
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Cost $/kVA 50–200 50–200 40–1500 –– –– 1000–3000 1250–3500
Limitations None/ tuning Aging Aging Size None Batteries Batteries Batteries/ fuel
Energy storage No No No No No Yes Yes Yes
Maintenance required No No No No No Yes Yes
Voltage Disturbances versus Correction Methods
Correction method Power- harmonic filters Surge suppressor Surge suppressor Const.-volt transformer Volt compensator UPS UPS plus E/G set
Duration Continuous ms 0.17 1 ms Continuous Continuous 0.2 s 2 s 1–60 min Over 60 min
TABLE 8.1 Voltage disturbance Waveform 1. distortion Surge 2. to 200% Surge to 200% Sag to 50% 3. at 50% load Sag to 70% at 100% of load Sag to 50% 4. Sag to 0% Sag to 0% 5. Outage 6.
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