Tutorial Program


In addition to the Technical Sessions and Committee Meetings, a Tutorial Program is scheduled for Sunday, May 19th that is free for all students with a full registration. The tutorials are:

Tutorial #1: AC Motor Protection


4-hour tutorial offered by Timothy Coyle, P.E. This tutorial will focus on the protection of AC induction motors using microprocessor-based multi-function protective relays, drawing on material from IEEE 3005.8 – Recommended Practice for Motor Protection in Industrial and Commercial Power Systems. It will provide a bridge from the straightforward overload and short circuit protection typical for small and medium motors to the more sophisticated protection available and often required for large or critical motors. The principles of operation and performance characteristics of induction motors will be reviewed including the effect of starting method on current and torque and the importance of motor-load interaction during starting.

Typical instrument transformer configurations and protection schematics for circuit breakers and contactors will be presented. Use and interpretation of manufacturer’s motor data sheets will be discussed, and recommendations will be provided for selection and setting of relay elements to protect the motor against thermal damage, electrical fault, and abnormal system conditions.


Tutorial #2: T.B.D.


Tutorial #3: High Impedance Bus Differential Protection


4-hour tutorial offered by Marcos Donolo, PhD. This tutorial will focus on the principles of operation and considerations for the application of high impedance protective relays. Topics will include:

  • An overall description of high impedance protection schemes
  • Considerations for the selection of high impedance or percentage restrained differential relays
  • Current transformer considerations and recommendations
  • Protective relay settings considerations and selection
  • Applications with mixed current transformer classes
  • Applications multi-ratio current transformers
  • Applications with low class current transformers
  • Open and shorted current transformer detection for commissioning and routine operation

Tutorial #4: Ground Fault Protection – Principles and Applications


4-hour tutorial offered by Nehad El-Sherif, M.Sc., P.Eng., MBA, SMIEEE. Ground faults comprise approximately 98% of all electrical failures impacting an industrial power system. Hence, the ability to detect ground faults and respond timely is paramount. In this tutorial, the principles of ground-fault protection (protective relay technologies, detection methods, proper operation, testing, and installation problems), their applications, and code requirements in Canada and the US are described. The goal is to help protection engineers, engineering consultants, and power system operators to apply ground-fault protection systems correctly, while complying with local electrical codes.