In-person instruction

Basic protective relay testing

Learning objective

At the completion of this course, students will be able to test the most common IEEE protective relay functions on a variety of manufacturers’ products.

Course abstract

Protective relays are used for the electrical protection of distribution equipment such as transformers, substation equipment and electrical transmission lines. Abnormal conditions, phase differentials, overcurrent and overvoltage are topics discussed for prevention of equipment damage and safety. Understanding the functions of Current Transformer (CT) and Voltage Transformer (VT) ratios, polarity and operating principles as they apply to relaying are essential to the relay protection system and are covered in the course. Various manufacturers’ relays will be used for a realistic handson reinforcement of classroom-taught material, along with demonstrations for the best experience and education. Review of drawings depicting a range of complexity of relay schemes AC and DC will also be covered.

Target audience

Maintenance technicians, electricians, engineers or any others who are responsible for maintaining a safe and reliable electrical power distribution system in an industrial or commercial facility.

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Course options

In-person training

5 days, 4 CEU
Location: Various
Cost $1995 USD

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Class topics

Introduction to basic relays
Power triangle calculations
Phasor diagrams
CT and VT construction and connections as they apply to relaying and metering circuits
Relay test equipment
Understanding phase and ground short circuit, detection and safe clearing

IEEE protective functions include:

AC time overcurrent (51)
Instantaneous (50)
Undervoltage (27)
Overvoltage (59)
Directional Overcurrent (67)
Transformer differential (87T)
Over frequency (81O)
Under frequency (81U)
Sync check (25)

Relay manufacturers and types include:

ABB CO
GE IAC
ABB CV
GE IAV
ABB CR
ABB Circuit Shield
Eaton EDR5000

Eaton is an intelligent power management company dedicated to improving the quality of life and protecting the environment for people everywhere. We are guided by our commitment to do business right, to operate sustainably and to help our customers manage power ─ today and well into the future. By capitalizing on the global growth trends of electrification and digitalization, we’re accelerating the planet’s transition to renewable energy and helping to solve the world’s most urgent power management challenges.