ABB RELION 670 Series Technical Manual page 659

1MRK 502 066-UUS B
uN uN
Samples of the
neutral voltage
from which the
fundamental and
3rd harmonic
voltages are
filtered out
ANSI10000202 V1 EN-US
Figure 353: Protection principles for STEFPHIZ (59TD) function
9.6.3 Function block
NEUTVOLT
TERMVOLT
52A
BLOCK
BLOCK3RD
BLOCKVN
ANSI11000211 V1 EN-US
Figure 354: STEFPHIZ (59THD) function block
Technical manual
stator winding stator winding
x E3 x E3
N N N
RN RN Rf Rf
x
1 or 100 %
Neutral point fundamental frequency
over-voltage protection 5% - 100%
over- voltage protection 10% – 100%
3rd harmonic
Differential
differential
0% – 30%
0% - 30%
STEFPHIZ (59THD)
TRIP
TRIP3H
TRIP_VN
PICKUP
PU_3H
PU_VN
VT3
VN3
E3
ANGLE
DV3
BV3
V_N
ANSI11000211-1-en.vsd
CB 1 may not exist CB 1 may not exist
(1- x) E3 (1- x) E3
CB 1 CB 1
T T
uT uT
1 - x 1 - x
Samples of the
terminal voltage
from which the
3rd harmonic
voltage is filtered
out
Voltage protection
CB 2 CB 2
Transformer
ANSI10000202-1-en.vsd
Section 9
SEMOD172810-4 v4
653