ABB Relion 650 Series Technical Manual page 88

Section 5
Impedance protection
STNDAG
DIRAG
STNDBG
DIRBG
STNDCG
DIRLCG
STNDAB
DIRAB
STNDBC
DIRBC
STNDCA
DIRCA
BLK
ANSI09000245 V1 EN-US
Figure 38: Composition of pickup signals in directional operating mode
Tripping conditions for the distance protection zone one are symbolically presented in figure 39.
Timer tPPx=Enabled
STZMPP
Timer tLGx=Enabled
STZMLG
BLKTR
ANSI09000246 V1 EN-US
Figure 39: Tripping logic for the distance protection zone (where x is 1-5 depending on
82
AND
AND
AND
AND
AND
AND
AND
OR
AND
selected zone)
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OR
&
OR &
15 ms
OR
& t
tPPx
AND
t
tPEx
t
AND
15ms
AND
t
ANSI09000246-1-en
1MRK 506 326-UUS B
STZMLG.
STZMPP
PICKUP
ANSI09000245-1-en.vsd
OR
TRZx
Line distance protection REL650
Technical manual