ABB RET 541 - Page 56

Fig. 11 Transformer in block connection with a generator. The transformer terminal RET 543 is used for
overall differential protection. An earthing resistor is recommended for the generator. The REX 521
protection relay is used for abnormal voltage and frequency supervision and protection of the net-
work and the machine.
3~
G
MF
RET_/3I
RET_/1I
REM_/3I
REM_/3U
REM_/3I
RET_/3I
REX521/1U
REX521/3U
REM/RTD
REM_/1U
T
O
T
oo
w
0
U
0
I
3I
3I I
TCS
R
RET 54_
87TN
46I >
2
HV
LV
DI >
0
3 49T
0
I >
51N
HV
CBFP
LV
50N
62BF
I >
HV
0
3I>
LV
51N
50N
50
51
3DI>
87TG
HV
3I>
50
51
3U> 59
U > 59N
81Uf >
f
0
U
MCS
TCS
R
000
REX 521 H06
CBCM
3U< 27
3U
0
87G3DI>
3I>
51
50
50NI >
I(U)>
51V
3U> 59
59NU >
38
49
60F
49G
46
32
I >
3
P>
40X<
f
3I
U
0
Q
P
TCS
U
R
000
MCS
pf
REM 54_
CBFP
62BF
51N
3U< 27
T
o
0
0
2
Q>
E
gener_blockconn-trafo1
Q
P>
Q
000
Transformer Terminal RET 541, RET 543, RET 545
1MRS755543
56