ABB REX 521 - Application

24
1MRS751802-MUM
Protection Relay
Technical Reference Manual, Standard Configurations
REX 521
B01
Fig. 3.1.1.1.-1 Block diagram of B01
3.1.1.2. Application
The B01 standard configuration for 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, refer to the application examples of B01 on Section
9.1. Outgoing feeder, Basic B01, Section 9.2. Incoming feeder, Basic B01 and
Section 9.3. Transformer feeder, Basic B01.
49F
3
3I > 50/51
I >
0
50N/51N
3I >
2f
68
I >
46
CBFP
62
TCS
CBCM
0
I
MCS
3I~harm
000
R
3I
I
0
REX 521 B01
LO
86