ABB REG650 Technical Manual page 11

Technical Manual
Signals.............................................................................................162
Settings............................................................................................162
Operation principle..........................................................................163
Load encroachment....................................................................163
Simplified logic diagrams............................................................164
Technical data.................................................................................165
Section 8 Current protection..............................................................167
Four step phase overcurrent protection 3-phase output OC4PTOC
(51/67)..................................................................................................167
Identification ...................................................................................167
Functionality....................................................................................167
Function block.................................................................................168
Signals.............................................................................................168
Settings............................................................................................169
Monitored data.................................................................................171
Operation principle..........................................................................172
Technical data.................................................................................176
Four step residual overcurrent protection, zero, negative sequence
direction EF4PTOC (51N/67N).............................................................177
Identification ...................................................................................177
Functionality....................................................................................177
Function block.................................................................................178
Signals.............................................................................................178
Settings............................................................................................179
Monitored data.................................................................................182
Operation principle..........................................................................182
Operating quantity within the function........................................182
Internal polarizing.......................................................................183
Operating directional quantity within the function.......................186
External polarizing for ground-fault function...............................187
Base quantities within the protection..........................................188
Internal ground-fault protection structure....................................188
Four residual overcurrent steps..................................................188
Directional supervision element with integrated directional
comparison function...................................................................189
Technical data.................................................................................194
Sensitive directional residual overcurrent and power protection
SDEPSDE (67N)...................................................................................195
Identification....................................................................................195
Functionality....................................................................................195
Table of contents
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