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Categorization of Disturbances
Transients
Short Duration Variations
< 1/2 cycle
0
1/2 cycle - 1 min.
Oscillatory Transient
> 1minute.
1 minute.
1/2 cycle
Impulse Transient
Long Duration Variations
Instantaneous swell/sag/interruption.
Over/under voltage
Interruption
1/2 - 30 cycle
Momentary swell/sag/interruption
30 cycle - 3sec
Temporary swell/sag/interruption.
3sec - 1minute.
> 1minute.
Categories
Transients
Impulsive
Nanosecond
Microsecond
Millisecond
Oscillatory
Low Frequency
Medium Frequency
High Frequency
Typical
Spectral Content
5 s rise
1 μs rise
Typical
Duration
Typical Voltage
Magnitude
0.1 ms rise
< 50 s
50 s -1 ms
> 1 ms
< 5 kHz
5 - 500 kHz
0.5 - 5 MHz
0.3 - 50 ms
20 μs
5 μs
0 - 4 per-unit
0 - 8 per-unit
0 - 4 per-unit
0.5 - 30 cycles
0.5 - 30 cycles
0.1 - 0.9 per-unit
1.1 - 1.8 per-unit
0.5 cycles - 3 sec
30 cycles - 3 sec
30 cycles - 3 sec
< 0.1 per-unit
0.1 - 0.9 per-unit
1.1 - 1.4 per-unit
3 sec - 1 min
3 sec - 1 min
3 sec - 1 min
< 0.1 per-unit
0.1 - 0.9 per-unit
1.1 - 1.2 per-unit
Long Duration RMS Variations
Interruption, Sustained
Undervoltages
Overvoltages
Current Overload
>
>
>
>
0.0 per-unit
0.8 - 0.9 per-unit
1.1 - 1.2 per-unit
Voltage Imbalance
Current Imbalance
Steady-state
Steady-state
0.5 - 2%
1.0 - 30%
Waveform Distortion
DC Offset
Harmonics
Interharmonics
Notching
Noise
0 - 9 kHz
0 - 9 kHz
0 - 0.1%
0 - 20%
0 - 2%
Broadband
Steady-state
Steady-state
Steady-state
Steady-state
Steady-state
Voltage Fluctuations
< 25 Hz
Intermittent
0.1-7%, 0.2-2 Pst
< 10 sec
± 0.10 Hz
Short Duration RMS Variations
Instantaneous
Sag
Swell
Momentary
Interruption
Sag
Swell
Temporary
Interruption
Sag
Swell
Power Frequency Variations
1
1
1
1
minute
minute
minute
minute
0 - 1%
Customer Contact Information:
Company:
___________________________________________________
Address:
___________________________________________________
Contact Name:
___________________________________________________
Phone Number: ___________________________________________________
Fax Number:
___________________________________________________
E-mail Address: ___________________________________________________
Equipment or Process Affected:
Equipment Type:
_____________________________________________
Manufacturer:
_____________________________________________
Equipment Rating:
_____________________________________________
Mitigation Equipment:
_____________________________________________
Symptoms (√ all):
□
Error/Fault Code □
Control Problem □
Dimming Lights
□
Breaker Tripping □ Equipment Overheating □ Equipment Damage □
Harmonic Problem □ Capacitor Bank Failure □ Other □
UPS Beeping
□
Short Power Loss
□
Drives/PLC Tripping
Other Details: _________________________________________________________
Disturbance Information:
Date: ___________________________________________________________
Time: ___________________________________________________________
Event Description:
_______________________________________________
_______________________________________________
Weather Conditions: _______________________________________________
Duration (√):
< 2 seconds
Regularity (√):
Daily □
□
Hourly
2-120 seconds
□
Weekly
□
□
> 2minutes
> Unknown
□
> Unknown
□
Lost Production Time (hrs): ____________________________
_____________________________
Additional Comments: ______________________________________________
______________________________________________
□