Print this page Grounding System Theory and Practice
Velimir Lackovic, MScEE
Course Outline
Underground-fault conditions, the flow of current will result in voltage gradients within and around the substation, not only between structures and nearby earth, but also along the ground surface. In a properly designed system, this gradient should not exceed the limits that can be tolerated by the human body.
The purpose of a ground mat study is to provide for the safety and well-being of anyone that can be exposed to the potential differences that can exist in a station during a severe fault. The general requirements for industrial power system grounding are similar to those of utility systems under similar service conditions. The differences arise from the specific requirements of the manufacturing or process operations.
This course includes
a multiple choice quiz at the end,
Learning Objective
At the conclusion of this course, the student will:
- Basic theory behind Grounding System Analysis;
- Why grounding systems are important part of commercial and industrial power systems;
- Calculation of step and touch voltages;
- Consequences of inadequate grounding system design; and
- Commercial software modelling techniques, simulation performance and interpretation of the results.
Intended Audience
This course is intended for electrical engineers.
Benefit to Attendees
Attendee of this course will understand basic grounding principles, methods for soil resistivity measurement and understand how to design and size grounding system for the typical substation. Also attendee will be able to calculate important grounding parameter such as touch and step voltages.
Course Introduction
The definition of grounding is commonly used for both, system grounding and equipment grounding. The National Electrical Code (NEC) defines system ground as a connection to ground from one of the current-carrying conductors of an electrical power system or of an interior wiring system, whereas an equipment ground is defined as a connection to ground from one or more of the noncurrent-carrying metal parts of a wiring system or equipment connected to the system.
Course Content
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Grounding System Theory and Practice
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Course Summary
System grounding has been used since electrical power systems began. However, many companies and industrial plants have used system grounding methods differently. The problem of whether a system neutral should be grounded, and how it should be grounded, has many times been misunderstood completely. Therefore, grounding of many systems has been based upon past experience rather than engineering analysis.
This course provides applicable information for grounding, such as definitions, reasons for having a system ground, the most desirable grounding method, and so on, and how to measure ground resistance in order to maintain the grounding system.
Quiz
Once you finish studying the above course content, you need to take a quiz to obtain the PDH credits.
DISCLAIMER: The materials contained in the online course are not intended as a representation or warranty on the part of PDH Center or any other person/organization named herein. The materials are for general information only. They are not a substitute for competent professional advice. Application of this information to a specific project should be reviewed by a registered architect and/or professional engineer/surveyor. Anyone making use of the information set forth herein does so at their own risk and assumes any and all resulting liability arising therefrom.
