Prerequisite Training packages

Generator Protection Training package

  • Trainer: Dr. Saeed Roostaee (Profile on Linkedin)
  • Pre-recorded videos
  • Supplementary Files
  • The course is licensed and you need a Windows computer to view the videos
  • Download this course: contact us or leave a comment on this post

Generator & Step-up transformer Protection
  • 87G Generator Differential Protection
  • 87T GSU Trans. Differential Protection
  • 87GT Overall Differential Protection
  • 40G Generator Field Failure Protection
  • 78G Generator Pole Slipping Protection
  • 50S, Generator Split phase overcurrent protection
  • 46 Generator Negative Phase Sequence Protection
  • 51V Generator Voltage-Dependent O/C Protection
  • 49S Generator Stator Overload Protection
  • 59G Generator Overvoltage Protection
  • 21G Generator Underimpedance Protection
  • 27G Generator Undervoltage Protection
  • 32R Generator Reverse Power Protection
  • 64S Generator 95%&100% Stator Earth Fault Protection
  • 51/27 Generator Dead Machine Protection
  • 64GB Generator Busbar Earth Fault Protection
  • 64R Generator Rotor Earth Fault Protection
  • 81O Generator Overfrequency Protection
  • 81U Generator Underfrequency Protection
  • 24G Generator Overflux Protection
  • 47G Generator Fuse Failure Supervision
  • 50/51ET Excitation Trans. Overcurrent Protection
  • 49ET Excitation Trans. Overload Protection
  • 51N-GSU Gen. Step-up Trans. Neutral Point OvercurrentProtection
  • 64T GSU Trans. Restricted Earth Fault Protection
  • 50/51T GSU Trans. Over Current Protection
  • 50/51SST Station Service Trans. Over Current Protection
  • …..

Attached PDFs

  • Std. 242: Buff Book
  • C37.102: IEEE Guide for Generator Protection
  • C37.101: IEEE Guide for AC Generator Ground Protection
  • C37.106: IEEE Guide for Abnormal Frequency Protection for Power Generating Plants
Generator-transformerprotection
Cylindrical Rotor & Stator
Salient Pole Rotor & Stator

WHY GENERATOR PROTECTION?

  • Unnecessary tripping of Generators is undesirable (production losses, black-out, startup time)
  • Not tripping and damaging the machine would be expensive (to repair)

The fault current in the faulted generator does not stop when the Generator is tripped or the field breaker is tripped. The flux/ energy stored in the field will continue to supply fault current for several seconds

ABB REG 670
  • Generator differential
  • Transformer differential
  • Four-step overcurrent protection (DFT based measurement)
  • Four-step residual overcurrent protection
  • Over/under voltage protection (DFT based measurement)
  • Residual overvoltage protection
  • Overexcitation protection
  • General current and voltage protection
  • Directional over/under power function
GE G60 Generator Protection
  • 21P Phase distance backup
  • 51N Neutral time overcurrent
  • 24 Volts per hertz
  • 59N Neutral overvoltage
  • 25 Synchrocheck
  • 59P Phase overvoltage
  • 27P Phase Undervoltage
  • 59X Auxiliary overvoltage
  • 27TN Third harmonic neutral Undervoltage
  • 59_2 Negative-sequence overvoltage
  • 27X Auxiliary Undervoltage
  • 64F Field ground protection
  • 32 Sensitive directional power
  • 64S Sub-harmonic stator ground protection
  • 40 Loss of excitation
  • 64TN 100% stator ground
  • 46 Generator unbalance
  • 67_2 Negative-sequence directional overcurrent
  • 49 Thermal overload protection (RTD)
  • 67N Neutral directional overcurrent
  • 50BF Breaker failure
  • 67P Phase directional overcurrent
  • 50G Ground instantaneous overcurrent
  • 68 Power swing blocking
  • 50N Neutral instantaneous overcurrent
  • 78 Out-of-step protection
  • 50P Phase instantaneous overcurrent
  • 81O Overfrequency
  • 50SP Split phase protection
  • 81R Rate of change of frequency
  • 50/27 Accidental energization
  • 81U Underfrequency
  • 51G Ground time overcurrent
  • 87RGF Restricted ground fault
  • 51PV Phase time overcurrent with voltage restraint
  • 87S Stator differential
SEL 700 G Generator Protection
SEL-300G Generator Relay
SIPROTEC 7UM Generator with Auxiliary Transformer
Sepam 2000

Basic Generator Protection Features

  • Ground differential
  • Sensitive restricted earth fault
  • Thermal overload
  • Negative-sequence
  • Residual-ground and neutral-ground overcurrent elements
  • Directional residual-ground
  • Overcurrent elements
  • Unbalance element
  • Voltage-controlled, voltage-restrained time-overcurrent
  • Breaker failure protection for three-pole breaker
  • Under- and overvoltage
  • Inverse-time over- and Undervoltage elements
  • Loss-of-potential element
  • Volts/hertz or overexcitation protection
  • Directional power elements
  • Loss-of-field
  • Over- and under frequency protection
  • Rate-of-change-of- frequency
  • RTD protection
Optional Generator Protection
  • Generator synchronism check
  • Synchronism-check under- and overvoltage
  • Inverse-time over- and Undervoltage
  • Out-of-step
  • vector shift
  • 100% stator ground protection
  • …..