Table of Contents
Advertisement
Blocking of signals during test ........................................................... 53
Functionality.................................................................................. 53
&KDSWHU
/LQH LPSHGDQFH
3 zone impedance protection (Z(n)RW)............................................. 56
Application .................................................................................... 56
Functionality.................................................................................. 60
Design........................................................................................... 64
Calculations .................................................................................. 66
Automatic switch onto fault logic (SOTF)........................................... 72
Application .................................................................................... 72
Functionality.................................................................................. 72
Calculations .................................................................................. 73
Scheme communication logic (ZCOM) ............................................. 74
Application .................................................................................... 74
Functionality.................................................................................. 74
Calculations .................................................................................. 77
&KDSWHU
&XUUHQW
High speed and instantaneous phase
overcurrent protection (HSOC, IOC).................................................. 80
Application .................................................................................... 80
Functionality.................................................................................. 80
Calculations .................................................................................. 82
Time delayed phase and residual overcurrent protection (TOC1) ..... 85
Application .................................................................................... 85
Functionality.................................................................................. 85
Calculations .................................................................................. 87
Two step definite and inverse time delayed phase overcurrent
protection (TOC2) .............................................................................. 91
Application .................................................................................... 91
Functionality.................................................................................. 91
Calculations .................................................................................. 94
Sudden current change function (SCC) ............................................ 99
Application .................................................................................... 99
Functionality.................................................................................. 99
Calculations ................................................................................ 101
Two step definite and inverse time-delayed residual
overcurrent protection (TEF1 and TEF2) ........................................ 103
Application .................................................................................. 103
Functionality................................................................................ 105
Calculations ................................................................................ 110
Scheme communication logic for residual
overcurrent protection (EFC) ......................................................... 113
Application .................................................................................. 113
Functionality................................................................................ 113
Design......................................................................................... 116
Calculations ................................................................................ 116
&RQWHQWV
Advertisement
Table of Contents
