Motor Bus Transfer Applications Issues and Considerations


Motor Bus Transfer Applications Issues and Considerations

Based on the May 2012 Report of the IEEE Power System Relaying Committee Rotating Machinery Protection Subcommittee

and IEEE Std C37.96-2012 Guide for AC Motor Protection, Clause 6.4 Motor bus transfer (MBT)

  • Introduction
  • Why Transfer Motor Load Sources
  • Basic Application Configurations
    • Primary-Backup
    • Main-Tie-Main
    • Multiple-Option Source Selection
  • Motor Bus Transfer Classification – Methods & Modes
    • Automatic and Manual
    • Closed Transition Method – Hot Parallel Transfer
    • Open Transition Method - Fast, In-Phase, Residual w/Case Study
    • Open Transition Modes – Simultaneous, Sequential
  • Transfer Initiate, Inadvertent External Operation, Lockouts
  • Load Shed During Transfer
  • Conditions Across Normally Open Startup or Bus Tie Breaker – Before / During Transfer
    • Effects of a Fault
    • Out-of-Step (OOS) Generator Trip
    • System Separation between Incoming Supply Sources
    • Supply Source Transformer Winding Phase Shift
    • Transient Effects upon Disconnect of Motor Loads
    • Motor and Load Characteristic Effects on MBT
  • Resultant V/Hz Limits - ANSI Standard C50.41-2012
  • Bus Transfer Spin Down Testing, Acceptance Testing, Setting Considerations
  • Spin Down Analysis & Settings Calculations – Case Study
  • Sequential vs. Simultaneous Transfer, The Need for Speed – Case Study
  • IEEE Fast Transfer Sync Check Relay Performance Test Protocol Results
  • IEEE Residual Voltage Transfer Relay Performance Test Protocol Results
  • Motor Bus Transfer System Dynamic Performance Test Protocol Results and Observations
  • A Motor Bus Transfer Torque Ratio Criterion applied to Live Open Transition Transfers Under Normal Operating Load Conditions - Observations and Conclusions
  • Test Results from Modeling of Transient Currents and Torques on Motors during Residual Voltage Motor Bus Transfer
  • Conclusions


  Date and Time




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CEO, Beckwith Electric Co., Inc.


As CEO of Beckwith Electric Co., Inc., Tom provides the leadership to develop and implement strategies for product development, marketing, sales, manufacturing, quality control and staffing. In addition to his main responsibilities, Mr. Beckwith is a major contributor to strategic planning and growth of Beckwith Electric and provides leadership and input to the Beckwith Electric Co. Design Review Board, responsible for the enhancement of existing products and the development of new products and services.


Tom Beckwith has over forty-five years’ experience in the electric power industry, encompassing the fields of product and systems design, field applications and commissioning, and sales and marketing. Beginning in 1970, Tom worked for Beckwith Electric Co., initially as an R&D Design Engineer and later in Systems Engineering, Field Commissioning and as Production Manager. He subsequently held positions as Vice President of Sales and Marketing and President of the Beckwith Engineering Services and Training (BEST) division.


Tom has a Bachelor of Science degree in Electrical Engineering (BSEE) from Case Western Reserve University and a Master of Business Administration (MBA) degree from the University of South Florida. He is a member of the IEEE Power & Energy Society and the IEEE Industry Applications Society. He has served on various working groups in the Power Systems Relaying Committee since 1972. He is a co-inventor of a 1993 U.S. patent on a Multifunction Protective Relay System.