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ELECTRICAL POWER ENGINEER: CONTINUING PROFESSIONAL DEVELOPMENT

Understanding Current Interruption Transients: TRVs, Reignitions and Restrikes

Whether you simply want to remain at the forefront of your career in Electric Power Technology or need to continue your education to maintain your status as a licensed Professional Engineer (P.Eng.), EITI’s continuing education programs can help you succeed in your career and gain a competitive edge.

Note: Also see our other Engineering Pro-D courses: Circuit Breakers for Engineers and Surge Arrester Application and Insulation Coordination in AC Power Systems.

PROGRAM OUTLINE:

This advanced course covers the origin and derivation of the transient recovery voltage (TRV) requirements for circuit breakers applied for fault clearing and the switching of inductive and capacitive loads. The course first develops the fundamental concepts involved following current interruption including oscillatory circuits, symmetrical components and travelling waves. The developed concepts are then applied to the individual current interruption case TRVs and associated reignitions or restrikes. All cases are well illustrated by real examples. At the end of the course, attendees will have an in-depth knowledge and understanding of the TRV requirements in IEC standards and also know how to deal with exceptional cases.

Students will learn:
  • Fundamental basis for TRVs and reignition and restriking transients
  • Derivation of pole factors and amplitude factors associated with TRVs as specified in IEC 62271-100 and IEEE C37.04, C37.06 and C37.09
  • Calculation of the effects of adding surge capacitors to control TRVs; effect of shunt capacitor banks, load sharing reactors and opening resistors
  • Calculation of TRVs and reignition and resriking transients assocated with inductive and capacitive loads, respectively.

Introduction
  • Overview and definitions
  • Basic principle of current interruption in circuit breakers
Oscillatory Circuits
  • General approach to series and parallel RLC oscillatory circuits
  • Underdamping, critical damping and overdamping
  • Damping factors
  • Amplitude factors
Symmetrical Components
  • Basic theory and general approach to using symmetrical components
  • Balanced and unbalanced fault calculations
  • AC recovery voltage calculations
  • First, second and third pole factors
Travelling Waves
  • Basic concepts
  • Open circuit and short circuit termination cases
Terminal Faults
  • Circuit breaker rating basis
  • Four parameter and two parameter TRVs
  • 'Standard' circuit for TRV derivation
  • 100% and 60% terminal faults
  • 30% and 10% terminal faults
  • Effect of shunt capacitors, load sharing reactors and opening resistors
  • Double earth faults
  • Asymmetrical fault currents
  • Type testing
Short Line Faults
  • Line side travelling waves
  • TRV calculation
  • Type testing
Out-of-Phase Switching
  • TRV considerations
  • Type testing
Inductive Load Switching
  • Shunt reactor switching
  • Unloaded transformer switching
Capacitive Load Switching
  • Shunt capacitor bank switching
  • Unloaded transmission line switching
  • Unloaded cable switching


PRE-REQUISITE:

    To benefit from the course attendees should have a basic prior knowledge of the following:

  • Electric circuit theory.
  • Trigonometric and exponential functions.
  • Symmetrical components.
  • IEC Standards 62271-100 and 62271-110 or IEEE Standards C37.04. C37.06 and C37.09.
  • Use of Excel for equation based calculations.
  • Bring a calculator and a laptop loaded with Excel!


CERTIFICATION AND CREDITS

  • All students are tested in knowledge and performance, and must achieve a grade of 70%.


SCHEDULE, REGISTRATION, AND FEES

For more information, contact info@eiti.us


LOCATIONS

  • TEXAS
  • OKLAHOMA
  • BC
  • YOUR SITE (CUSTOMIZED)

INSTRUCTOR:

David Peelo, Director of Electrical Engineering Continuing Education Programs

David Peelo is a consulting electrical engineer. He graduated in electrical engineering from University College Dublin in 1965 and worked first for the ASEA Power Transmission Products Division in Ludvika, Sweden. He joined BC Hydro in 1973, where he rose to the position of specialist engineer for switchgear and switching. He became an independent consultant in 2001. In 2004 the Eindhoven University of Technology awarded him a PhD for original research on current interruption using air-break disconnect switches. He has published more than 60 papers on switching in high voltage systems and on surge arrester application. He is a Fellow of the Institution of Electrical Engineers, a Distinguished Member of CIGRE and a Senior Member of the IEEE. He is convener of IEC Maintenance Team 32 Inductive Load Switching and IEC Maintenance Team 42 Capacitive Current Interrupting Capability of Disconnectors and is a national representative on a number of CIGRE Working Groups and on a IEC Project Team.



 

 

For more detailed information, contact EITI.