System protection is known as the art of engineering, the building block of every utility. We need proper protection for generation, transmission, distribution systems, and renewables: first and second lines of defense as well as backup protection. Relays represent the brain power that differentiates between normal and fault conditions and triggers the operating muscle, which is the disconnecting devices, such as circuit breakers and reclosers to isolate the faults. There are key differences between breakers, reclosers & fuses. The consequences for improper protection and/or relay misoperation are grave. This course will show the differences between breakers, reclosers & fuses, as well as the consequences of improper protection and/or relay misoperation. This course will also cover special relay traits, protection zones, common relay types and communication methods, fuse curves, and DER impact. In System Protection, you'll learn ...

• How to provide proper protection for electrical systems
• The differences between breakers, reclosers & fuses
• Common relay types and communication methods
• The consequences of improper circuit protection

Learning Objectives:

• Common causes of faults
• How relays operate and what they are used for Characteristics of underground (UG) vs. overhead (OH) systems
• The importance of providing overcurrent protection to prevent injury to people
• Seven characteristics to consider when selecting a relay
• How zones of protection operate
• Important concepts of the fuse curve
• How instrument transformers are used to communicate with relays
• IEEE relay numbers
• Two commonly used methods for lightning protection