ABB Relion 670 series - Page 659

x E3
Rf
T
CB 2
(1- x) E3
over- voltage protection 10% – 100%
Differential
0% – 30%
CB 1 may not exist
RN
N
CB 1
stator winding
uT
uN
x E3
Rf
Transformer
T
CB 2
(1- x) E3
x
Neutral point fundamental frequency
over-voltage protection 5% - 100%
3rd harmonic
differential
0% - 30%
CB 1 may not exist
1 or 100 %
RN
NN
CB 1
stator winding
uT
uN
1 - x1 - x
Samples of the
neutral voltage
from which the
fundamental and
3rd harmonic
voltages are
filtered out
Samples of the
terminal voltage
from which the
3rd harmonic
voltage is filtered
out
ANSI10000202-1-en.vsd
ANSI10000202 V1 EN-US
Figure 353: Protection principles for STEFPHIZ (59TD) function
9.6.3 Function block
SEMOD172810-4 v4
ANSI11000211-1-en.vsd
STEFPHIZ (59THD)
NEUTVOLT
TERMVOLT
52A
BLOCK
BLOCK3RD
BLOCKVN
TRIP
TRIP3H
TRIP_VN
PICKUP
PU_3H
PU_VN
VT3
VN3
E3
ANGLE
DV3
BV3
V_N
ANSI11000211 V1 EN-US
Figure 354: STEFPHIZ (59THD) function block
1MRK 502 066-UUS B Section 9
Voltage protection
653
Technical manual