ABB Relion 650 Series Technical Manual page 150

Section 5
Impedance protection
ZOUTA
ZINA
ZOUTB
ZOUTC
detected
ANSI05000113 V2 EN-US
Figure 80: Detection of power swing in phase A
I0CHECK
BLK_I0
BLK_SS
BLOCK
EXT_PSD
ANSI09000223 V1 EN-US
Figure 81: Simplified block diagram for ZMRPSB (68) function
144
AND
AND
OR
0
0-tW
ZOUT_A
OR
ZOUT_B
ZOUT_C
AND
AND
AND
AND
-loop
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0-tP1
OR
0
-loop
0-tP2
0
AND
ZIN_A
ZIN_B
ZIN_C
AND
10 ms
t
OR
tR1
t
-loop
tR2
t
tH
t
OR
1MRK 506 326-UUS B
-loop
OR DET-A
AND
ANSI05000113-2-en.vsd
ZOUT
ZIN
OR
INHIBIT
OR
PICKUP
AND
ANSI09000223-1-en.vsd
Line distance protection REL650
Technical manual