Sr-No | Subject | Type of Disturbance | Time Duration | Range | ||
Minimum Value | Maximum Value | |||||
1 | Frequency | Slight deviation | 10 s | 49.50 Hz | 50.50 Hz | |
Sever deviation | 47 Hz | 52 Hz | ||||
2 | Voltage | Average Voltage | 10 min | 0.85 Un | 1.1 Un | |
Flicker | - | - | 7% | |||
Sag | Short | 10 ms - 1 s | 0.1 U | 0.9 U | ||
Long | 1 s - 1 min | |||||
Long-Time Disturbances | >1 min | |||||
Under Voltage | Short | <3 min | 0.99 U | - | ||
Long | >3 min | |||||
Swell | Temporary short | 10 ms - 1 s | 1.1 U | 1.5 kV | ||
Temporary Long | 1 s - 1 min | |||||
Temporary-Long Time | >1 min | |||||
Over Voltage | <10 ms | 6 kV | ||||
3 | Harmonics & Miscellaneous Signals | Harmonics | - | THD > 8% | - | |
Miscellaneous Signals | - | Including in Other Disturbance | - |