ABB REG670 - Function Block

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
IEC10000202-1-en.vsd
IEC10000202 V1 EN
Figure 256: Protection principles for STEFPHIZ function
9.6.3 Function block
IEC11000211-1-en.vsd
STEFPHIZ
NEUTVOLT
TERMVOLT
CBCLOSED
BLOCK
BLOCK3RD
BLOCKUN
TRIP
TRIP3H
TRIPUN
START
START3H
STARTUN
UT3
UN3
E3
ANGLE
DU3
BU3
UN
IEC11000211 V1 EN
Figure 257: STEFPHIZ function block
1MRK502052-UEN B Section 9
Voltage protection
533
Technical manual