ABB RET 541 Product Manual page 53

Transformer Terminal
M M
MF
RET/3I
REF/3I
M
RET/1I
REF/1I
M
M
M
M
RET/1U
REF/1I
REF,REA/3I
RET/1I
RET/3I
MF
M
Fig. 8 Protection, control, measurement and supervision functions of a YNd-connected power trans-
former, implemented with an RET 543 transformer terminal, REF 543 feeder terminals and REA
101 arc protection. The low-voltage network is earthed via a zig-zag earthing transformer.
3I>
3I >
2f
I >
0
CBFP 62BF
REF 54_
3ΔI>
ΔI >
0
HV
ΔI >
0
LV
3
Θ
P> Θ
3I >
2f
HV
M
RET 54_
3I>
I >
0
CBFP
REF 54_
M
RET 541, RET 543, RET 545
000
51 3U> 59
50
68 3U< 27
3I
3U
51N
50N
000
87T 3I> 51
HV 50
87TN 3I> 51
3I
LV 50
87TN I > 51N
0 3I
HV 50N
I
0
49T I > 51N
0
LV 50N
T
O
68 CBFP 62BF
LV
CBFP 62BF
U
HV
000
67 3U> 59
51N
3U< 27
3I
50N
3U
62BF f> 81O
df/dt 81O-R
P
3I-harm
3U-harm
E
YNd transformer with earthing transformer on LV side
1MRS755543
I
0
R
TCS
000
I
0
U
R
TCS
T
w
U
90
3I>
&
I
0
R
pf
TCS
REA 101
Q
f
53