CYG PRS-7367 - Page 11

Table of contents
PRS-7367 3
3.3 Directional overcurrent protection 67P ........................................................ 41
3.3.1 67P Overview ..................................................................................................................... 41
3.3.2 67P Protection Principle ..................................................................................................... 43
3.3.3 67P Application Scope ....................................................................................................... 46
3.3.4 67P Settings ....................................................................................................................... 47
3.4 Non-directional earth-fault protection 51G .................................................. 48
3.4.1 51G Overview .................................................................................................................... 48
3.4.2 51G Protection Principle .................................................................................................... 49
3.4.3 51G Application Scope ....................................................................................................... 51
3.4.4 51G Settings ...................................................................................................................... 51
3.5 Directional earth-fault protection 67G .......................................................... 53
3.5.1 67G Overview .................................................................................................................... 53
3.5.2 67G Protection Principle .................................................................................................... 54
3.5.3 67G Application Scope ....................................................................................................... 58
3.5.4 67G Settings ...................................................................................................................... 58
3.6 Switch onto fault SOTF ................................................................................. 59
3.6.1 SOTF Overview.................................................................................................................. 59
3.6.2 SOTF Protection Principle ................................................................................................. 60
3.6.3 SOTF Application Scope .................................................................................................... 64
3.6.4 SOTF Settings.................................................................................................................... 64
3.7 Circuit breaker failure protection 50BF ........................................................ 65
3.7.1 50BF Overview................................................................................................................... 65
3.7.2 50BF Protection Principle .................................................................................................. 66
3.7.3 50BF Application Scope ..................................................................................................... 73
3.7.4 50BF Settings..................................................................................................................... 73
3.8 Three-phase thermal overload protection 49F ............................................ 74
3.8.1 49F Overview ..................................................................................................................... 74
3.8.2 49F Protection Principle ..................................................................................................... 75
3.8.3 49F Application Scope ....................................................................................................... 76
3.8.4 49F Settings ....................................................................................................................... 77