Protection & Control Seminar
Protection & Control Seminar
July 30 - August 2, 2018
Clearwater Beach, FL

Power Plant Protection Track

Thursday, August 2, 2018


7:00-8:00 AM

Motor Bus Transfer
Instructor: Tom Beckwith

Motor Bus Transfer is the process of rapidly transferring sources to a motor bus for planned source switching and unplanned source failure. The rapid transfer allows the process to continue without interruption. To avoid damage to the motors, specialized equipment and methods are employed to cope with the dynamics of motor deceleration, and voltage and phase angle change between the new source and the motor bus. Improper reconnection of the motor bus can cause cumulative or immediate damage to the motors, and result in a process crash.

  • Why Transfer Motor Load Sources
  • Basic Application Configurations
  • Motor Bus Transfer Classification- Methods & Modes
    • Closed Transition Method- Hot Parallel Transfer
    • Open Transition Method- Fast, In-Phase, Residual w/Case Study
    • Open Transition Modes- Simultaneous, Sequential
  • Transfer Initiate and 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 Transmission or Distribution Incoming Supply Sources
    • Supply Source Transformer Winding Phase Shift
    • Transient Effects upon Disconnect of Motor Loads
    • Motor, Load, and Inertia Characteristic Effects on MBT
  • Resultant pu 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
  • Fast Transfer Sync Check Relay Performance Requirements
  • Residual Voltage Transfer Relay Performance Requirements
  • MBT Expanded Test Protocol - Performance Verification Test Results & Observations
  • A New Motor Bus Transfer Torque Ratio Criterion
  • Live Motor Bus Transfer Field Results
  • A Motor Torque Ratio Metric for Assessing Motor Bus Transfer
  • Observations & Conclusions

8:00-10:00 AM


10:00-10:15 AM

Motor Bus Transfer (Continued)

10:15-11:15 AM

Automatic Synchronizing
Instructor: Tom Beckwith

Synchronizing is the process of taking two electrical systems and connecting them. This can be affected on a generator to a bus, or a tie between two bulk power systems. Proper synchronizing involves minimizing the phase angle, slip frequency and voltage difference between the two systems. Prior to synchronizing, the systems may have a static phase angle or rotating phase angle. The application of sync check and automatic synchronizing elements is explored and calculations developed. Synchronizing schemes are illustrated that improve security. Specialized control algorithms to properly adjust generator speed and voltage for proper synchronization are defined and graphically illustrated.

  • Effects of Synchronizing Errors
  • Synchronizing System Components and Elements
  • Classical Synchronizing Scheme
  • Manually-Supervised Automatic Synchronizing
  • Fail-Safe Analysis and Schemes to Improve Security
  • Testing Provisions
  • Backup Path Philosophy
  • System Restoration Scenario (Tie Line Syncing)
  • Matching a Generator to the System Prior to Synchronizing
    • Conventional Method & Pulse-Width-Modulated Proportional Method
  • Field Test Results

11:15 AM-Noon


Noon-1:00 PM

Optional Beckwith Electric Factory Tour & Product Demo

  • 1:00-1:05 PM: Load Shuttle Bus for Beckwith Headquarters. Please go directly to the bus in front of the Sandpearl Resort on Mandalay Avenue.
  • 1:05-1:45 PM: Travel to Beckwith Headquarters
  • 1:45-5:00 PM: Beckwith Electric Factory Tour & Product Demo
  • 5:00-5:45 PM: Travel Back to Hotel

1:00-5:45 PM