ABB REX 521 - 9 Application Examples, Basic; Outgoing Feeder, Basic B01; Features

1MRS751802-MUM
REX 521
133
Protection Relay
Technical Reference Manual, Standard Configurations
9. Application examples, Basic
9.1. Outgoing feeder, Basic B01
9.1.1. Features
This application example describes an outgoing feeder of a single busbar including:
• Overcurrent protection
• Non-directional earth fault protection
• Phase discontinuity protection
• Thermal overload protection for cable/line
The network is either resistance or solidly earthed. The three-phase current
measurement is established with a set of current transformers. The neutral current is
measured in a residual connection.
Fig. 9.1.1.-1 B01 is used for protection, measuring and supervision on an
outgoing feeder in a single busbar system. The supplying network
is either solidly or resistance earthed.
49F
3
3I > 50/51
I >
0
50N/51N
I >
46
CBFP
62
TCS
CBCM
3I
I
0
0
I
MCS
3I~harm
000
R
REX 521 B01
UserOutgF
Application Example 1