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The Types of Power Quality Disturbances

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Haytham Fayek

on 15 August 2014

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Transcript of The Types of Power Quality Disturbances

The Types of Power Quality Disturbances
MSc, BEng (Hons)
MIEEE, MIFAC, MEEA

Transient
Haytham Fayek
Oscillatory
Possible Solutions
Waveform
Effects
Causes
Possible damage
Loss of data

Switching of inductive/capacitive Load
Malfunction of Capacitor Bank
VR Settings

SPD
Uninterruptible Power Supply (UPS)
reactors/ chokes
Zero crossing switch
Impulse
Possible Solutions
Waveform
Effects
Causes
Possible damage
Loss of data
System halts

Lightning
Electrostatic discharge (ESD)
Switching impulses
Utility fault clearing

Surge Protective Devices (SPD)
Maintain humidity between 35% – 50%
Possible Solutions
Waveform
Effects
Causes
Possible damage
Loss of data
Shutdown

Switching
Utility faults
Circuit breaker tripping
Component failures
UPS
Interruptions
Sag / Under-Voltage
Possible Solutions
Waveform
Effects
Causes
System halts
Loss of data
Shutdown

Startup Loads
Faults
Power Conditioner
UPS
Possible Solutions
Waveform
Effects
Causes
System halts
Loss of data
Shutdown
Load changes
Utility faults

Possible Solutions
Waveform
Effects
Causes
Nuisance tripping
Equipment damage
Reduced life span

Load changes
Utility faults
Possible Solutions
Waveform
Effects
Causes
Swell / Over-Voltage
Sag
Under-Voltage
Power Conditioner
UPS
Swell
Over-Voltage
Power Conditioner
UPS
Control transformer
Equipment damage
Reduced life span

Load changes
Utility faults
Power Conditioner
UPS
Control transformer
Waveform Distortion
Possible Solutions
Waveform
Effects
Causes
DC Offset
Transformers heating
Ground fault current
Nuisance tripping

Fault rectifiers
Power supplies
Repair/Replace defective equipment
Possible Solutions
Waveform
Effects
Causes
Harmonics
Electronic loads
Filter
Reconfigure distribution
Power conditioner
PFC power supply
Possible Solutions
Waveform
Effects
Causes
Inter-Harmonics
Light flickering
Heating
Communication interference

Control Signals
Faulty equipment
Induction motors
Arcing devies
Filter
Power Conditioner
UPS
Possible Solutions
Waveform
Effects
Causes
Noise
System halts
Data Loss

Transmitters/receivers
Faulty Equipment
Improper Grounding
Proximity to EMI/RFI source
Rectify transmitter/receiver
Reconfigure grounding
Relocate sensitive equipment
Shielding filter
Isolation
transformer
Possible Solutions
Waveform
Effects
Causes
Notching
System halt
Data loss

Variable speed drives
Arc welders
Light dimmers
Reconfigure distrubution
Relocate senstivie loads
Filters
UPS
Possible Solutions
Waveform
Effects
Causes
System halts
Light flicker

Intermittent operation of load/equipment
Frequency
Fluctuation
Possible Solutions
Waveform
Effects
Causes
System halts
Loss of data

Transmitters/receivers
Faulty Equipment
Improper Grounding
Proximity to EMI/RFI source
Rectify transmitter/receiver
Relocate equipment
Power Conditioner
UPS
Voltage
Fluctuation
Transformers heating
System halts
Rectify transmitter/receiver
Relocate distribution
Power Conditioner
UPS
Waveform
References
IEEE Recommended Practice for Monitoring Electric Power Quality, IEEE Std. 1159-1995.

IEEE Recommended Practice for Powering and Grounding Sensitive Electronic Equipment (IEEE Green Book), IEEE Std. 1100-1992.

J. Seymour, The Seven Types of Power Quality Problems, APC by Schneider Electric White Paper 18
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