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Type of Power Quality Disturbances - Coggle Diagram
Type of Power Quality Disturbances
Transient
1.1 Oscillatory Transient
1.1Low frequency
1.2.Medium frequency
1.3 high frequency
1.2 Impulsive Transient
2.1 Nanosecond
2.2 Microsecond
2.3 Milisecond
Voltage Imbalane
It happens at steady state condition.
Wavefrom distortion
Type
Interharmonics 0-60kHz
Harmonics
Typical spectral content : 0 - 100th
DC offset
Noise
Broadband
Notching
Long Duration variations
undervoltage (>1 min) (0.8-0.9pu)
overvoltage (>1min) (1.1-1.2pu)
sustained interruption (>1min) (0.0 pu)
Frequency variation
Occurs during steady state and typical duration < 10s
6.Voltage Fluctuation
Produced by:1.Arc furnaces
2.Arc welders
3.Installations with frequent motor starts
4.Equipment with excessive motor speed changes
Repetitive or random variations of the voltage envelope
Short Duration Variatonal
TEMPORARY
Interruption
Sag/dip
Swell
MOMENTORY
Interruption
Duration
Magnitude
Sag/dip
Swell
INSTANTANEOUS
Interruption
DURATION
0.5-30cycles
MAGNITUDE
0.1-0.9pu
Sag (dip)
DURATION
0.5-30cycles
MAGNITUDE
0.1-0.9pu
Swell
