Professional Course

Overcurrent Protection for Electric Utility Systems

PDHengineer, Online
6 hours
170 USD
Next course start
Start anytime! See details
Self-paced Online
6 hours
170 USD
Next course start
Start anytime! See details
Self-paced Online
This provider usually responds within 48 hours 👍

Course description

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In Overcurrent Protection for Electric Utility Systems, you'll learn ...

  • An approach for determining the appropriate settings for protection devices in typical environments, such as urban vs. rural service areas
  • How to calculate fault current for the four possible types of fault
  • Guidance on determining the location, type and size of sectionalizing devices for electric distribution systems
  • Guidelines for overcurrent protection of substations, overhead lines and underground lines


Credit: 6 PDH

Length: 83 pages

This course reviews the basics of overcurrent protection for electric distribution systems. The course discusses sectionalizing philosophy, how to calculate fault currents, the types and operation of different protective devices, and other considerations for designing an effective protective scheme.

Within the arena of sectionalizing, there are many aspects of the subject that are established, quantifiable, and part of national standards. Included in this body of information are specific time-current characteristics of fuses and relays, the methods of calculations for available short-circuit current, and the standard damage points for distribution transformers. There are also many aspects of sectionalizing that are more subjective, debatable, and influenced by experience. These include “fuse save” versus “fuse blow,” coordination margins, and transformer protection practices. This reflects the idea that system protection is partly science and partly art.

This course is suitable for engineers who are interested in learning more about the science and, to some extent, the art of sectionalizing.

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Who should attend?

Certificate of Completion

You will be able to immediately print a certificate of completion after passing a multiple-choice quiz consisting of 35 questions. PDH credits are not awarded until the course is completed and quiz is passed.

Training content

This course teaches the following specific knowledge and skills:

  • Understand the coordination philosophies that enhance reliability
  • Know the types of faults that occur on distributions systems
  • Know the four possible fault types
  • Know how to calculate fault currents
  • Know how to calculate per-unit values
  • Understand how oil circuit reclosers operate
  • Be able to explain the benefits of an automatic sectionalizer
  • The benefits and drawbacks of using fused cutouts
  • How to apply different types of sectionalizing equipment
  • Understand how layout a simple protective scheme for a distribution system


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7915 FM 1960 West, Suite 130
77070 Houston Texas

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