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Introduction to Short Circuit Current Calculations

COURSE NO: E08-005
Introduction to Short Circuit Current Calculations
Course Highlights

This online engineering PDH course presents the subject of short-circuit studies in a very structured fashion. First, a simple equivalent circuit is developed for a generic power system, the system impedances are recalculated to a common base, and finally faults are calculated at various locations throughout the system. A detailed explanation is offered for the calculation of three phase faults. Explained techniques can be also verified by any commercial power system software package.


Short-circuit studies are done to determine the magnitude of the prospective currents flowing throughout the power system at various time intervals after a fault occurs. The magnitude of the currents flowing through the power system after a fault varies with time until they reach a steady-state condition. The information is used to select fuses, breakers, and switchgear ratings in addition to setting protective relays.


This behavior is due to system characteristics and dynamics. During this time, the protective system is called on to detect, interrupt, and isolate these faults. The duty imposed on this equipment is dependent upon the magnitude of the current, which is dependent on the time from fault inception. This is done for various types of faults (three phase, phase-to-phase, double-phase-to-ground, and phase-to-ground) at different locations throughout the system.


This 8 PDH online course is applicable for electrical engineers who desire to gain an understanding of short circuit current calculations. In this course, you will learn about short circuit current calculations for industrial power systems; basic theory for short circuit calculations in electrical power systems; and how excessive short circuit currents can be mitigated.

Learning Objectives

This PE continuing education course is intended to provide you with the following specific knowledge and skills:

  • Understanding fault analysis according to industry standards
  • Learning about models of branch elements
  • Learning about the impedance diagram
  • Learning about system modelling and computational techniques
  • Understanding the extent of the model
  • Understanding the extent and requirements of short circuit current studies
  • Understanding the factors affecting accuracy of short-circuit studies
  • Learning about computer solutions
  • Undertaking a practical example
Course Document

In this professinal engineering CEU course, you need to review the course document titled, "Introduction to Short Circuit Current Calculations". 

To view, print and study the course document, please click on the following link(s):
Introduction to Short Circuit Current Calculations (1.9 MB)
Course Quiz
Once you complete your course review, you need to take a multiple-choice quiz consisting of fifty (50) questions to earn 8 PDH credits. The quiz will be based on this entire document.


The minimum passing score is 70%. There is no time limit on the quiz, and you can take it multiple times until you pass at no additional cost.
Certificate of Completion

Upon successful completion of the quiz, print your Certificate of Completion instantly. (Note: if you are paying by check or money order, you will be able to print it after we receive your payment.) For your convenience, we will also email it to you. Please note that you can log in to your account at any time to access and print your Certificate of Completion.

To buy the course and take the quiz, please click on: