CYG PRS-7367 - Page 13

Table of contents
PRS-7367 5
3.15 Under Voltage Load Shedding Protection 27............................................. 94
3.15.1 27 Overview ..................................................................................................................... 94
3.15.2 27 Protection Principle ..................................................................................................... 95
3.15.3 27 Application Scope ....................................................................................................... 97
3.15.4 27 Settings ....................................................................................................................... 97
3.16 Positive sequence under voltage protection 27P ..................................... 98
3.16.1 27P Overview ................................................................................................................... 98
3.16.2 27P Protection Principle ................................................................................................... 99
3.16.3 27P Application Scope ...................................................................................................100
3.16.4 27P Settings ...................................................................................................................100
3.17 Under voltage protection CUB_27 ............................................................ 100
3.17.1 CUB_27 Overview .........................................................................................................100
3.17.2 CUB_27 Protection Principle .........................................................................................101
3.17.3 CUB_27 Application Scope ............................................................................................102
3.17.4 CUB_27 Settings ...........................................................................................................103
3.18 Over frequency protection 81O ................................................................ 103
3.18.1 81O Overview ................................................................................................................103
3.18.2 81O Protection Principle ................................................................................................104
3.18.3 81O Application Scope...................................................................................................105
3.18.4 81O Settings ..................................................................................................................105
3.19 Under frequency protection 81URS ......................................................... 105
3.19.1 81URS Overview ...........................................................................................................105
3.19.2 81URS Protection Principle ...........................................................................................106
3.19.3 81URS Application Scope ..............................................................................................107
3.19.4 81URS Settings .............................................................................................................108
3.20 Under frequency restore protection 81URE ............................................ 108
3.20.1 81URE Overview ...........................................................................................................108
3.20.2 81URE Protection Principle ...........................................................................................109
3.20.3 81URE Application Scope .............................................................................................. 110
3.20.4 81URE Settings ............................................................................................................. 110