ABB REG670 - Page 202

IEC11000218-1-en.vsd
15ms
OR
t
tPP
BLKTRIP
t
AND
AND
AND
STL1
STL2
STL3
TRIP
TRL1
TRL2
TRL3
AND
Timer tPP=On
STPP
AND
Timer tPE=On
STPE
AND
t
tPE
IEC11000218 V1 EN
Figure 76: Tripping logic for the distance protection zone
Zone timer logic for the distance protection is symbolically presented in figure 77.
1 timers seperated
2 timers linked
3 internal start
4 start from phSel
5 external start
internalCommonStart
phSelStart
externalCommonStart
t
tON
t
tON
BLOCK
TRPE
TRPP
³1
³1
&
Internal
start
a
b
a=b
a
b
a<b
STTIMER
&
&
&
STPP
STPE
&
&
Internal
start
IEC12000463-3-en.vsd
FALSE
³1
ZnTimerSel
IEC12000463 V2 EN
Figure 77: Zone timer logic
Section 7 1MRK502052-UEN B
Impedance protection
196
Technical manual