Incoming Feeder, Basic B01; Features - ABB REX 521 Technical Reference Manual, Standard Configurations

1MRS 751802-MUM
9.2.
9.2.1.
Protection Relay
Technical Reference Manual, Standard Configurations

Incoming feeder, Basic B01

Features

This application example describes an incoming feeder to a single busbar including:
• overcurrent protection
• non-directional earth-fault protection
The network is resistance or solidly earthed. The three-phase current measurement
is established with current transformers. The neutral current is measured via a
current transformer located in the neutral earthing circuit on the LV side of the
power transformer.
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MCS
000
3I > 50/51
TCS
I >
50N/51N
0
CBCM 0
CBFP 62
3I~harm
I
3I
0
Application Example 2
REX 521 B01
REX 521
I
R
MCS
3I > 50/51
TCS
I >
50N/51N
0
CBCM 0
I > 46
3I~harm
3 49F
CBFP
62
3I
Application Example 1
REX 521 B01
000
I
R
I
0
117