4T-Short Circuit Analysis for HV Three Phase Systems

Overview

Credit: 4 technical hours

A fault on a high-voltage three-phase system is simply defined as the number of undesirable, but unavoidable, incidents that can temporarily disturb the stable condition of the power system that occurs when the insulation of that system fails at any point. Moreover, if a conducting object comes in contact with a bare power conductor, a short circuit or fault is said to have occurred. The causes of faults are many, including lighting, wind damage, trees falling across transmission lines, vehicles or aircraft colliding with the transmission towers or poles, birds shorting lines, or vandalism. In this course, the effects of faults on the system will be analyzed.

This course introduces the student to the basic concepts of fault studies on a high voltage three-phase system. Firstly, there is a quick review of “Per Phase” & “Per Unit” methodologies. The student then learns to identify the types of faults on a three-phase system. System faults are then analyzed with the use of symmetrical components. System modeling is then used in order to aid in the process, with the ability to move between asymmetrical and symmetrical systems.

Specific Knowledge or Skill Obtained

This course teaches the following specific knowledge and skills:

∙ Analyze faults using symmetrical components

∙ Use system modeling to aid in the process

How to move between asymmetrical and symmetrical systems