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An Introduction to Gas Insulated Electrical Substations

COURSE NO: E03-043
COURSE PROVIDER: Donald Parnell, P.E.
An Introduction to Gas Insulated Electrical Substations
Course Highlights

This online engineering course provides a basic overview of Gas Insulated Substations (GIS) and GIS technology.


A GIS is a high voltage substation in which the major conducting structures are contained within a sealed environment with a dielectric gas known as sulfur hexafluoride gas (SF6) as the insulating medium. In comparison, a conventional (AIS) or Air-Insulated Substation, uses atmospheric air as the dielectric gas medium, as these types of substations are almost always located at outdoor locations.


This 3 PDH online course is intended for electrical engineers and all other technical personnel working within the electric utility industry, who are interested in gaining a better understating of GIS systems and GIS technology.
Learning Objectives

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

  • Familiarizing with the basic concept of a GIS System
  • Learning about Hybrid GIS Substations
  • Understanding the advantages and disadvantages of GIS Systems
  • Learning about SF6 gas, leak detection, and gas monitoring systems
  • Familiarization with international standards relating to GIS
  • Understanding the basic economic considerations of GIS vs AIS
  • Learning about contaminants and oxidation in the gas
  • Familiarizing with enclosure modules for a GIS System
  • Learning about conductors in a GIS System
  • Familiarizing with the circuit breakers and transformers used in GIS Systems
  • Learning about switching and arrester devices used in GIS Systems
  • Learning about the connections in GIS Systems
  • Familiarizing with the control system of a GIS
  • Familiarizing with testing, installation, and operational procedures for a GIS
Course Document
In this professional engineering CEU course, you need to review the course document titled, "An Introduction to Gas Insulated Substations" by Don Parnell, PE.
To view, print and study the course document, please click on the following link(s):
Course Quiz
Once you complete your course review, you need to take a multiple-choice quiz consisting of twenty (20) questions to earn 3 PDH credits. The quiz will be based on the 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: