Application - ABB REX 521 Technical Reference Manual, Standard Configurations

REX 521
3.1.1.2.
18
Protection Relay
Technical Reference Manual, Standard Configurations
3I > 50/51
I >
50N/51N
0
3I >
68
2f
46
I >
3 49F
CBFP 62
LO 86
REX 521 B01
)LJ  %ORFN GLDJUDP RI %

Application

This standard configuration for the REX 521 is designed to be used in single busbar
systems using one circuit breaker for selective short-circuit, time overcurrent and
earth-fault protection of radial isolated neutral networks, solidly earthed networks,
resistant earthed networks and resonant earthed networks.
For more detailed information, please refer to the application examples of B01 on
pages 104, 117 and 126.
MCS 000
TCS
CBCM
0 I
R
3I~harm
I
3I
0
1MRS 751802-MUM