ABB REX 521 - 10 Application Examples, Medium; Outgoing Feeder, Medium M01; Features

1MRS751802-MUM
REX 521
173
Protection Relay
Technical Reference Manual, Standard Configurations
10. Application examples, Medium
10.1. Outgoing feeder, Medium M01
10.1.1. Features
This application example describes an outgoing feeder of a single busbar including:
• Overcurrent protection
• Directional earth fault protection
• Phase discontinuity protection
• Thermal overload protection for cable/line
The network is compensated earthed or isolated. Three-phase current measurement
is established with a set of current transformers and the neutral current is measured
with a cable transformer. The residual voltage is measured with a set of voltage
transformers in an open-delta connection.
Fig. 10.1.1.-1 REX 521 M01 used for protection, measuring and supervision on
an outgoing feeder in a single busbar system. The system earthing
of the supplying network is either compensated or isolated.
49F
3
I >
46
CBFP
62
3I~harm
3I > 50/51
I >
0
67N
TCS
CBCM
3I
I
0
U
0
0
I
MCS
000
R
REX 521 M01
UserOutgM01
Application Example 5