Function Block, Zone 4 - ABB REL 501-C1 2.5 Technical Reference Manual

1.4
60
Distance protection (ZM)
ZM2--
ZM2
BLOCK TRIP
BLKTR START
VTSZ STND
STCND
xx00000703.vsd
Figure 20: ZM2 function block for three phase tripping
ZM3--
ZM3
BLOCK TRIP
BLKTR TRL1
VTSZ TRL2
STCND TRL3
START
STL1
STL2
STL3
STND
xx00000175.vsd
Figure 21: ZM3 function block for single, two and/or three phase tripping
ZM3--
ZM3
BLOCK TRIP
BLKTR START
VTSZ STND
STCND
xx00000704.vsd
Figure 22: ZM3 function block for three phase tripping

Function block, zone 4

ZM4--
ZM4
BLOCK TRIP
BLKTR START
VTSZ STND
STCND
xx00000176.vsd
Figure 23: ZM4 function block
Chapter 4
Line distance