Protective Relay Theory & Applications

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The installation, application and coordination of protective relays and systems are an art. This art form involves many disciplines and is both challenging and interesting. Understanding the basics gives you tools to manage these systems. Using the information presented during this course, you will have the ability to make decisions about the suitability, maintenance and testing of your relay system.

This course will introduce the basic operating concepts of protective relays for generation, transmission and distribution of electrical systems. Utilizing ANSI and IEEE standards you will be given the basic understanding of how various relays protect specific applications of an electrical system.

Anyone who works on or near power generation, transmission, or distribution systems should attend this course.

(8 Hours)

INTRODUCTION
Instrument Transformers
Relay Inputs and Sensing
Sensing Circuits

THE LANGUAGE OF PROTECTIVE RELAYING
IEEE-ANSI Abbreviations
IEEE-ANSI Device Numbers
ASA-Standard Symbols
Drawing Examples

BASIC RELAY THEORY AND OPERATION
Applicable Devices
Current Transformers
Potential Transformer
Auxiliary Transformers
Differentials

APPLICATIONS
Over Voltage / Under Voltage
Under Voltage / Over Voltage
Comparative Sensing
Metering
Sensing/Communications

BASIC PROGRAMMING
Binary
Analog
Alarms
Safeties/Interlocks
Equipment Specific Applications

SAFETY
Stored Energy
NFPA 70E Compliance
PPE Requirements
Arc Flash Considerations