ABB REC650 - Page 9

Instantaneous residual overcurrent protection EFPIOC .................. 90
Identification ............................................................................... 90
Functionality................................................................................ 91
Function block............................................................................. 91
Signals.........................................................................................91
Settings........................................................................................91
Monitored data.............................................................................92
Operation principle...................................................................... 92
Technical data............................................................................. 92
Four step residual overcurrent protection, zero, negative
sequence direction EF4PTOC .........................................................92
Identification ............................................................................... 93
Functionality................................................................................ 93
Function block............................................................................. 94
Signals.........................................................................................94
Settings........................................................................................95
Monitored data.............................................................................98
Operation principle...................................................................... 98
Operating quantity within the function.................................... 98
Internal polarizing................................................................... 99
External polarizing for earth-fault function............................102
Base quantities within the protection....................................102
Internal earth-fault protection structure................................ 102
Four residual overcurrent steps............................................103
Directional supervision element with integrated
directional comparison function............................................104
Second harmonic blocking element...........................................108
Technical data........................................................................... 109
Sensitive directional residual overcurrent and power protection
SDEPSDE ..................................................................................... 110
Identification.............................................................................. 110
Functionality.............................................................................. 110
Function block........................................................................... 111
Signals.......................................................................................111
Settings......................................................................................112
Monitored data...........................................................................113
Operation principle ................................................................... 113
Function inputs..................................................................... 113
Directional residual current protection measuring 3I
0
·cos φ.114
Directional residual power protection measuring 3I
0
· 3U
0
· cos φ...................................................................................116
Directional residual current protection measuring 3I
0
and φ 117
Directional functions............................................................. 118
Non-directional earth fault current protection....................... 118
Table of contents
3
Technical manual