Technical data

Feeder Terminal REF 541, REF 543, REF 545.
1MRS750443-MBG
61
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.
MF
MF
q
q
p>
MCS
R
pf
P
E
CBCM
TCS
000
0
I
3I
3U
EXINFDR2
3I >
&
f
3I>
67
I
0
> 50N/51N
SEF 51N
3U > 59
3U < 27
CBFP * /62
3D I >
87T
R
000
DI
0
>
87N
DI
0
>
87N
CBFP * /62
3I > 50/51
CBFP
* /62
MCS
R
CBCM
TCS
000
0
I
I
0
>
50N/51N
I
02f
>
68
R
000
U
90V
U
REF 54_
SPAU 341
REA 101
3I~harm
3U~harm
REF 54_
SPAD 346C
f < 81U