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Publication Details
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| T074700 5138 |
2007 |
PQIG |
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Practical Guidelines for Evaluating the Impact of Transients on Utility Customers
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The objective of this project was to develop an application guide that provides a review of the power
system transient phenomena that can negatively affect utility and customer systems. The guide
includes relevant standards‐related information and representative waveforms for many of the
common transients that occur on the electric power system, including capacitor bank switching,
feeder and transformer energizing, fuse operation, faults, arrester operation, induction motor
starting, lightning, and ferroresonance.
Utilities and their customers are increasingly adding power factor correction capacitors and other
switched devices to their systems, thereby increasing the probability of power quality problems due
to the resulting transient voltages and currents. This guide presents the complex subject of power
system transients using easily understandable terms, guidelines, and examples. In addition, present
industry best practices for mitigating these transients are presented.
The guide includes an introductory section that provides guidelines for identifying and classifying
power system transients, a review of related common customer power quality problems, and a
number of example transient waveforms. There are also sections that include guidelines for
monitoring and simulating power system transients, power conditioning alternatives for mitigating
transients, and a number of case studies.
This report provides utility distribution and power quality engineers with a summary of power
system transients and commonly applied methods for reducing their effect on utility and customer
power systems.
Keywords:
Transient, Surge, Power Quality, Power Conditioning, Surge Protection, Capacitor Bank
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