ABB Relion 670 Series Technical Reference Manual page 11

Technical reference manual
Introduction......................................................................................161
Principle of operation.......................................................................162
Logic diagram.............................................................................162
Function block.................................................................................163
Input and output signals..................................................................163
Setting parameters..........................................................................163
Technical data.................................................................................164
Additional security logic for differential protection STSGGIO (11)........164
Introduction......................................................................................164
Principle of operation.......................................................................165
Function block.................................................................................170
Input and output signals..................................................................170
Setting parameters..........................................................................171
Technical data.................................................................................172
Section 6 Impedance protection .......................................................173
Distance measuring zones, quadrilateral characteristic ZMQPDIS
(21), ZMQAPDIS (21), ZDRDIR (21D)..................................................173
Identification....................................................................................173
Introduction(21)...............................................................................173
Principle of operation.......................................................................174
Full scheme measurement.........................................................174
Impedance characteristic............................................................175
Minimum operating current.........................................................179
Measuring principles...................................................................180
Directional impedance element for quadrilateral
characteristics.............................................................................182
Simplified logic diagrams............................................................185
Function block.................................................................................189
Input and output signals..................................................................190
Setting parameters..........................................................................192
Technical data.................................................................................194
Distance measuring zone, quadrilateral characteristic for series
compensated lines ZMCPDIS (21), ZMCAPDIS (21), ZDSRDIR
(21D).....................................................................................................195
Introduction......................................................................................195
Principle of operation.......................................................................196
Full scheme measurement.........................................................196
Impedance characteristic............................................................197
Minimum operating current.........................................................201
Measuring principles...................................................................202
Table of contents
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