
IdUnre
IDMAG_A
2nd
Harmonic
5th
Harmonic
Wave
block
IDA
AND
Cross Block
from B or C phases
OR
IBIAS
TRIPUNRE_A
PU_A
TRIPRES_A
BLK2H_A
BLK5H_A
BLKWAV_A
ANSI05000168_2_en.vsd
a
b
b>a
OR
AND
Cross Block
to B or C phases
AND
AND
AND
BLKUNRES
BLOCK
BLKRES
NOT
CrossBlockEn=Enabled
ANSI05000168 V2 EN
Figure 38:
Transformer differential protection simplified logic diagram for Phase A
Section 6
1MRK 502 048-UUS A
Differential protection
114
Technical manual