Print this page Protection of Three Phase Integral Horsepower Motors
Course Outline
This 7-hour course covers the recommended practice for proper protection for three phase integral horsepower motors.
The course materials are based entirely on Chapter 10 Motor Protection of IEEE 242-2001 IEEE Recommended Practice for Protection and Coordination of Industrial and Commercial Power Systems. It will be necessary for the student to obtain a copy of IEEE 242-2001 IEEE Recommended Practice for Protection and Coordination of Industrial and Commercial Power Systems. This is a very useful resource and is recommended that all practicing electrical or project engineers involved in the specification, design, protection, installation, and maintenance of three phase integral horsepower motors used in industrial and commercial power systems obtain a copy or have access to this important recommended practice.
This course includes a multiple-choice quiz at the end, which is designed to enhance the understanding of the course materials.
Learning Objective
At the conclusion of this course, the student will be familiar with:
- Definitions of the terms that are used in this recommended practice;
- Factors to consider in protection of motors;
- Motor characteristics;
- Motor-starting characteristics;
- Load characteristics;
- Types of protection;
- Undervoltage protection;
- Single phasing protection;
- Phase unbalance protection;
- Overcurrent protection
- Ground fault protection;
- Low voltage motor protection;
- Thermal and electronic overload relays
- Fuses, circuit breakers, and motor circuit protectors;
- Medium voltage motor protection;
- Motor overcurrent differential relay;
- Stator winding overtemperature;
- Mechanical and other protection;
- Synchronous motor protection;
- Surge protection; and
- Protection against automatic reclosing or automatic transfer.
Intended Audience
The intended audience is professional electrical engineers, project managers, and project engineers, involved in the specification, design, protection, installation, and maintenance of three phase integral horsepower motors used in industrial and commercial power systems.
Benefit to Attendees
This course provides the recommended practice to properly protect three phase integral horsepower motors. The proper protection will not only minimize the damage and cost of repairs, but will also minimize the electrical system disturbance. Prompt fault clearing usually prevents catastrophic damage. Proper protection is, therefore, important for motors of all sizes. The protection that is described in this course should be used as a checklist when deciding upon protection for a given installation.
Course Introduction
This 7-hour course covers the recommended practice for the proper protection for three phase integral horsepower motors.
Many factors should be considered in choosing motor protection; motor importance, motor rating (from one to several thousand horsepower), thermal limit of rotor or stator, environment, power system source and its neutral grounding method, type of motor controller, etc. Protection for each specific motor installation should meet the requirements of the application. Power quality of the plant distribution system should be given appropriate attention, especially with regard to voltage sags and surges, harmonics, service interruptions, and operation of distribution line reclosers. Thisrecommended practice is a useful tool that assists individuals, organizations, and suppliers involved in the specification, design, installation, and maintenance of three phase integral horsepower motors. This recommended practice is recognized in the industry for assisting in the proper protection of motors utilized in electrical distribution systems.
Course Content
This recommended practice provides for proper protection for three phase integral horsepower motors. The course materials are based entirely on Chapter 10 Motor Protection of IEEE 242-2001 IEEE Recommended Practice for Protection and Coordination of Industrial and Commercial Power Systems. It will be necessary for the student to obtain a copy of IEEE 242-2001 IEEE Recommended Practice for Protection and Coordination of Industrial and Commercial Power Systems. This is a very useful resource and is recommended that all practicing electrical or project engineers involved in the specification, design, protection, installation, and maintenance of electric motors used in industrial and commercial power systems obtain a copy or have access to this important recommended practice.
IEEE 242-2001 IEEE Recommended Practice for Protection and Coordination of Industrial and Commercial Power Systems can be purchased from the following websites:
http://www.api.com/
http://www.global.ihs.com/
IEEE 242-2001 IEEE Recommended Practice for Protection and Coordination of Industrial and Commercial Power Systems
Chapter 10 Motor Protection
Table of Contents
10.1 General discussion
10.2 Factors to consider in protection of motors
10.3 Types of protection
10.4 Low voltage motor protection
10.5 Medium voltage motor protection
10.6 References
10.7 Bibliography
You need to obtain a copy of IEEE 242-2001 IEEE Recommended Practice for Protection and Coordination of Industrial and Commercial Power Systems to successfully take this course.
Course Summary
This recommended practice covers the protection for three phase integral horsepower motors. Many factors should be considered in choosing motor protection; motor importance, motor rating (from one to several thousand horsepower), thermal limit of rotor or stator, environment, power system source and its neutral grounding method, type of motor controller, etc. Protection for each specific motor installation should meet the requirements of the application. Power quality of the plant distribution system should be given appropriate attention, especially with regard to voltage sags and surges, harmonics, service interruptions, and operation of distribution line reclosers. Thisrecommended practice is a useful tool that assists individuals, organizations, and suppliers involved in the specification, design, installation, and maintenance of three phase integral horsepower motors. The protection that is described in this course should be used as a checklist when deciding upon protection for a given installation. This recommended practice is recognized in the industry for assisting in the proper protection of motors utilized in electrical distribution systems.
Related Links
For additional technical information related to this subject, please visit the following websites or web pages:
http://www.ansi.com/
http://www.ieee.com/
http://www.api.com
http://www.nema.com
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.
