ABB RELION REX640 Technical Manual page 950

Protection functions
Enumeration name
BC Fault
CA Fault
ABC Fault
Table 911: Enumeration values for integer monitored data signal RELEASE_PP
Enumeration name
No fault
AB Fault
BC Fault
CA Fault
ABC Fault
The phase selection function can be set to issue an operate signal as the
faulted phase selection uses independent measuring elements from the distance
protection zones. This can be applied as a back-up protection for the measurement
zones. The time delay of the operate signals is defined with the
setting. The operate signal is the binary output OPERATE_GFC.
Faulted loop phase selection by the overcurrent method
The "Overcurrent" method is the basic method used for identifying the faulted
phases. It can be used in applications where the fault current magnitude exceeds
the load current despite the possible changes in the network configuration and fault
type.
In the overcurrent-based faulted phase selection method, the amplitude of each
phase current is compared to the
current magnitude exceeds the value of
faulty.
Table 912: Conversion from element start to monitored data signals
Start of element
I > &
A
EARTH_FLT
I > &
B
EARTH_FLT
I > &
C
EARTH_FLT
I > & I
A
Table continues on the next page
950
Earth-fault recognition is always required to release a phase-to-earth
impedance-measuring element.
>
B
Value
5
6
7
Value
-5
4
5
6
7
Str A Ph Sel GFC threshold setting. If the phase
Str A Ph Sel GFC , that particular phase is
START_GFC STARTS_GF
C
TRUE AG Fault
TRUE BG Fault
TRUE CG Fault
TRUE AB Fault
1MRS759142 F
Operate delay GFC
RELEASE_P RELEASE_P
E P
AG Fault No fault
BG Fault No fault
CG Fault No fault
No fault AB Fault
REX640
Technical Manual