ABB Relion 670 Series Technical Reference Manual page 13

Technical reference manual
Minimum operating current.........................................................265
Measuring principles...................................................................266
Directional lines..........................................................................268
Simplified logic diagrams............................................................270
Function block.................................................................................273
Input and output signals..................................................................273
Setting parameters..........................................................................275
Technical data.................................................................................276
Directional impedance element for mho characteristic and
additional distance protection directional function for earth faults
ZDMRDIR (21D), ZDARDIR.................................................................276
Introduction......................................................................................277
Principle of operation.......................................................................277
Directional impedance element for mho characteristic
ZDMRDIR (21D).........................................................................277
Additional distance protection directional function for ground
faults ZDARDIR..........................................................................280
Function block.................................................................................282
Input and output signals..................................................................283
Setting parameters..........................................................................284
Mho impedance supervision logic ZSMGAPC......................................285
Introduction......................................................................................285
Principle of operation.......................................................................285
Fault inception detection.............................................................285
Function block.................................................................................287
Input and output signals..................................................................287
Setting parameters..........................................................................288
Faulty phase identification with load encroachment FMPSPDIS
(21).......................................................................................................288
Introduction......................................................................................288
Principle of operation.......................................................................289
The phase selection function......................................................289
Function block.................................................................................301
Input and output signals..................................................................302
Setting parameters..........................................................................302
Technical data.................................................................................303
Distance protection zone, quadrilateral characteristic, separate
settings ZMRPDIS (21), ZMRAPDIS (21) and ZDRDIR (21D).............303
Introduction......................................................................................304
Principle of operation.......................................................................305
Full scheme measurement.........................................................305
Table of contents
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