Disturbances

Typical spectral content

Typical duration

Typical voltage magnitude

Voltage sag

0.5 cycles - 1 min

0.1 - 0.9 pu

Fluctuation and flicker

<25 Hz

Intermittent

0.1% - 7%

Harmonics

0 - 100^th Hz

Steady state

0% - 20%

Oscillatory transients

<5 kHz

0.3 - 50 ms

0 - 4 pu

Interharmonics

0 - 6 kHz

Steady state

0% - 2%