Power Quality Analyzer
Analyze power quality parameters and identify potential issues per IEEE 1159.
IEEE 1159 Power Quality Categories
| Category | Duration | Magnitude |
|---|---|---|
| Sag | 0.5 cycle - 1 min | 0.1 - 0.9 pu |
| Swell | 0.5 cycle - 1 min | 1.1 - 1.8 pu |
| Interruption | 0.5 cycle - 1 min | < 0.1 pu |
| Undervoltage | > 1 min | 0.8 - 0.9 pu |
| Overvoltage | > 1 min | 1.1 - 1.2 pu |
Power Quality Limits (IEEE 519 / ANSI C84.1)
Voltage Limits
- Service Voltage: +/- 5% nominal
- Utilization Voltage: +/- 10% nominal
- Voltage THD: < 5% (general)
- Voltage THD: < 8% (individual)
- Voltage Unbalance: < 3%
Other Limits
- Current THD: < 5-20% (varies by Isc/IL)
- Frequency: +/- 0.5 Hz (normal)
- Power Factor: > 0.9 (most utilities)
- Flicker Pst: < 1.0
- Flicker Plt: < 0.8