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.

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.

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 hands-on 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.

Class Topics include:

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 (59)
Overvoltage (67)
Transformer differential (87T)
Over frequency (81O)
Under frequency (81U)
Sync check (25)

Relay Manufacturers and Types include:

ABB CO
GE IAC
Eaton DT3000
ABB CV
GE IAV
ABB CR
ABB Circuit Shield
Eaton FP5000

Basic Protective Relay Testing - Pittsburgh