ABB RET 543 - Page 55

Fig. 10 Protection, control, measurement and supervision functions of an Yyn-connected industrial power
transformer, implemented with RET 543 transformer terminals, an REF 543 feeder terminal, an
REX 521 protection relay and REA 101 arc protection. The neutral point of the low-voltage network
is earthed via a high resistance.
Yyn-trafo_highresEarthedLV
MF
M
M
M
M
MF
REF/3I, REA 101/3I
RET/3I (Basic)
REF/3U
RET/1U (Multi)
RET/1I (Basic)
RET/3I (Multi)
RET/4I (Basic)
REX/1U REX/3U
RET/2U (Multi)
REF/1I
3DI > 87TG
3I
TCS
R
000
513I>
50
51N
50N
I >
0
62BFCBFP
3 49T
513I>
50
HV
LV
HV
LV
62BFCBFP
HV
0
DI > 87TN
LV
51N
50N
I >
0
LV
I
0
I
0
3I
3I
3U
50
62BFCBFP
I >
0
50N
51N
U >
0
3U<
59N
27
3I> 51 3U> 59
TCS
I
0
R
RET 54_ (Basic)
REF 54_
3I>
&
683I >
2f
REX 521 H06
U > 59N
3U<
3U>
27
59
TCS
MCS
CBCM
R
3U
U
0
000
p>
Q
Q
HV
REA 101
0
Z< 21
f>
df/dt
81O
81O-R
f<
df/dt
81U
81U-R
f
O
T
TC
T
T
U
U
R
U
RET 54_ (Multi)
U/f>
24
000
U< 27
000
000
Transformer Terminal RET 541, RET 543, RET 545
1MRS755543
55