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
N
N
CB 1
stator winding
uT
uN
1 - x
1 - 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 142:
Protection principles for STEFPHIZ function
9.5.3
Function block
STEFPHIZ
NEUTVOLT*
TERMVOLT*
CBCLOSED
BLOCK
BLOCK3RD
BLOCKUN
TRIP
TRIP3H
TRIPUN
START
START3H
STARTUN
DU3
BU3
IEC07000033-3-en.vsd
IEC07000033 V3 EN
Figure 143:
STEFPHIZ function block
9.5.4
Signals
Table 178:
STEFPHIZ Input signals
Name
Type
Default
Description
NEUTVOLT
GROUP
SIGNAL
-
Voltage connection neutral side
TERMVOLT
GROUP
SIGNAL
-
Open-Delta connection on Terminal side
CBCLOSED
BOOLEAN
1
Input 1 (TRUE) means breaker between gen. & tr.
is closed
Table continues on next page
Section 9
1MRK 502 048-UEN A
Voltage protection
286
Technical manual
Summary of Contents for REG650 ANSI
Page 1: ...Relion 650 series Generator protection REG650 Technical manual ...
Page 2: ......
Page 36: ...30 ...
Page 42: ...36 ...
Page 50: ...44 ...
Page 64: ...58 ...
Page 86: ...80 ...
Page 262: ...256 ...
Page 300: ...294 ...
Page 438: ...432 ...
Page 476: ...470 ...
Page 592: ...586 ...
Page 664: ...658 ...
Page 678: ...672 ...
Page 726: ...720 ...
Page 727: ...721 ...