ABB REF 541 Product Manual page 61

Feeder Terminal
MF
q
q
p>
MF
Fig. 14 Protection, control, measurement and supervision functions of a utility infeeder, implemented with
REF 54_ feeder terminals, an REA arc monitoring system and SPACOM differential relay and volt-
age regulator (main single-line diagram presentation). The neutral point of the MV network sup-
plied by the infeeder is earthed via a low resistance. The scheme is also fully applicable to other
types of low-impedance earthed networks, where the neutral point is earthed effectively or via a
low reactance.
REF 541, REF 543, REF 545.
3I > 50/51 MCS
I > 50N/51N
TCS
0
I > CBCM
68
02f
CBFP * /62
R
REF 54_
U
SPAU 341
D
3 I >
D
I >
0
D
I >
0
CBFP
SPAD 346C
3I> 67 MCS
I > 50N/51N TCS
0
CBCM
SEF 51N
3U > 59
3U < 27 R
f < 81U
P
CBFP * /62
pf
3I~harm
3U~harm
f
REF 54_
1MRS750443-MBG
000
0
I
90V
U
R
000
000
87T R
87N
87N
* /62
000
3I >
&
REA 101
0 I
3I
3U
E
EXINFDR2
61