9328900990 Rev L BE1-951 Protection and Control iii
Figure 4-7. Example 1, Change Group on Recloser Shot......................................................................... 4-8
Figure 4-8. Example 2, Error in Setting Group Control by Recloser Shot................................................. 4-8
Figure 4-9. Example 3, Using 79LO Logic to Modify Group Control......................................................... 4-9
Figure 4-10. Setting Group Selection Screen.......................................................................................... 4-10
Figure 4-11. Instantaneous Overcurrent Logic Blocks............................................................................ 4-12
Figure 4-12. BESTlogic Function Element Screen, Neutral (50TN)........................................................ 4-13
Figure 4-13. Overcurrent Protection Screen, 50T Tab............................................................................ 4-15
Figure 4-14. Time Overcurrent Logic Blocks........................................................................................... 4-16
Figure 4-15. BESTlogic Function Element Screen, Neutral (151N)........................................................ 4-17
Figure 4-16. Overcurrent Protection Screen, 51 Tab.............................................................................. 4-18
Figure 4-17. 51P Pickup Level Compensation........................................................................................ 4-20
Figure 4-18. Curve Coefficients Screen .................................................................................................. 4-22
Figure 4-19. Overcurrent Protection Screen, 67N Polarization Tab........................................................ 4-24
Figure 4-20. Sequence Components for an A-B Fault............................................................................ 4-27
Figure 4-21. Phase-to-Phase Fault Magnitude ....................................................................................... 4-27
Figure 4-22. Directional Power Logic Block ............................................................................................ 4-29
Figure 4-23. BESTlogic Function Element Screen, 32............................................................................ 4-30
Figure 4-24. Power Protection (Directional Power) Screen .................................................................... 4-31
Figure 4-25. Volts per Hertz Overexcitation Logic Block......................................................................... 4-32
Figure 4-26. Trip Time for Various Time Dials and Multiples of Pickup .................................................. 4-33
Figure 4-27. BESTlogic Function Element Screen, 24............................................................................ 4-34
Figure 4-28. Voltage Protection Screen, 24 Tab..................................................................................... 4-35
Figure 4-29. Phase Undervoltage/Overvoltage Logic Blocks.................................................................. 4-36
Figure 4-30. BESTlogic Function Element Screen, Phase (27P)............................................................ 4-37
Figure 4-31. Voltage Protection Screen, 27P Tab................................................................................... 4-38
Figure 4-32. Auxiliary Undervoltage/Overvoltage Logic Blocks .............................................................. 4-39
Figure 4-33. BESTlogic Function Element Screen, 59X ......................................................................... 4-40
Figure 4-34. Voltage Protection Screen, 59X/159X Tab......................................................................... 4-42
Figure 4-35. Negative-Sequence Overvoltage Logic Block .................................................................... 4-43
Figure 4-36. BESTlogic Function Element Screen, Negative Sequence (47)......................................... 4-44
Figure 4-37. Voltage Protection Screen, 47 Tab..................................................................................... 4-45
Figure 4-38. Over/Under Frequency Logic Block.................................................................................... 4-46
Figure 4-39. BESTlogic Function Element, 81 ........................................................................................ 4-47
Figure 4-40. Voltage Protection Screen, INH/81/181 Tab....................................................................... 4-48
Figure 4-41. Breaker Failure Logic Block................................................................................................ 4-49
Figure 4-42. BESTlogic Function Element Screen, Breaker Failure....................................................... 4-51
Figure 4-43. Breaker Failure Screen....................................................................................................... 4-52
Figure 4-44. General Purpose Logic Timers Logic Block........................................................................ 4-53
Figure 4-45. Mode 1, PU/DO (Pickup/Dropout Timer) ............................................................................ 4-54
Figure 4-46. Mode 2, One Shot Nonretriggerable Timer......................................................................... 4-54
Figure 4-47. Mode 3, One Shot Retriggerable Timer.............................................................................. 4-55
Figure 4-48. Mode 4, Oscillator ............................................................................................................... 4-55
Figure 4-49. Mode 5, Integrating Timer................................................................................................... 4-56
Figure 4-50. Mode 6, Latch ..................................................................................................................... 4-56
Figure 4-51. BESTlogic Function Element Screen, 62............................................................................ 4-57
Figure 4-52. Logic Functions Screen....................................................................................................... 4-58
Figure 4-53. Reclosing Logic Block......................................................................................................... 4-59
Figure 4-54. Recognition Dropout Timing ............................................................................................... 4-60
Figure 4-55. 79SCB Logic ....................................................................................................................... 4-60
Figure 4-56. BESTlogic Function Element Screen, 79............................................................................ 4-61
Figure 4-57. Reclosing Screen................................................................................................................ 4-62
Figure 4-58. S#-79SCB=1/2/3/4/5 Logic Timing Diagram....................................................................... 4-64
Figure 4-59. S#-79SCB=2/3/4/5 Logic Timing Diagram.......................................................................... 4-64
Figure 4-60. BESTlogic Function Element Screen, Reclosing (Zone Sequence Logic) ......................... 4-65
Figure 4-61. Overall Logic Diagram for Reclosing .................................................................................. 4-66
Figure 4-62. Sync-Check Element........................................................................................................... 4-67
Figure 4-63. BESTlogic Function Element Screen, 25............................................................................ 4-68
Figure 4-64. Voltage Protection Screen, 25 Tab..................................................................................... 4-69
Figure 4-65. 25VM Logic ......................................................................................................................... 4-71
Figure 4-66. 60FL Element...................................................................................................................... 4-71
Figure 4-67. 60FL Element Logic ............................................................................................................ 4-72
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