ABB RELION RET670 Applications Manual page 13

Transformer protection RET670 2.2 ANSI
Application manual
Additional distance protection directional function for earth faults
ZDARDIR..............................................................................................312
Identification.................................................................................... 313
Application....................................................................................... 313
Setting guidelines............................................................................ 313
Mho impedance supervision logic ZSMGAPC......................................315
Identification.................................................................................... 315
Application....................................................................................... 315
Setting guidelines............................................................................ 316
Faulty phase identification with load encroachment FMPSPDIS (21).. 317
Identification.................................................................................... 317
Application....................................................................................... 317
Setting guidelines............................................................................ 318
Load encroachment....................................................................319
Distance protection zone, quadrilateral characteristic, separate
settings ZMRPDIS (21), ZMRAPDIS (21) and ZDRDIR (21D)............. 320
Identification.................................................................................... 321
Application....................................................................................... 321
System grounding.......................................................................321
Fault infeed from remote end..................................................... 325
Load encroachment....................................................................326
Short line application.................................................................. 327
Long transmission line application..............................................328
Parallel line application with mutual coupling............................. 328
Tapped line application...............................................................335
Setting guidelines............................................................................ 337
General.......................................................................................337
Setting of zone 1.........................................................................338
Setting of overreaching zone......................................................338
Setting of reverse zone...............................................................339
Setting of zones for parallel line application............................... 340
Setting of reach in resistive direction..........................................341
Load impedance limitation, without load encroachment
function....................................................................................... 342
Load impedance limitation, with Phase selection with load
encroachment, quadrilateral characteristic function activated ...344
Setting of minimum operating currents.......................................344
Setting of timers for distance protection zones...........................345
Phase selection, quadrilateral characteristic with settable angle
FRPSPDIS (21).................................................................................... 345
Identification.................................................................................... 345
Table of contents
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