ABB RELION REX640 Technical Manual page 875

1MRS759142 C
REX640
Technical Manual
Table 833: Enumeration values for integer monitored data signal RELEASE_PP
Enumerator 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 Operate delay GFC 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 Str A Ph Sel GFC threshold setting. If the phase current
magnitude exceeds the value of Str A Ph Sel GFC, that particular phase is faulty.
Earth-fault recognition is always required to release a phase-to-earth
impedance-measuring element.
Table 834: Conversion from element start to monitored data signals
Start of element START_GFC
I > & TRUE
A
EARTH_FLT
I > & TRUE
B
EARTH_FLT
I > & TRUE
C
EARTH_FLT
I > & I > TRUE
A B
I > & I > TRUE
B C
I > & I > TRUE
C A
I > & I > & TRUE
A B
EARTH_FLT
I > & I > & TRUE
B C
EARTH_FLT
Table continues on next page
Protection functions
Value
-5
4
5
6
7
STARTS_GFC RELEASE PE
AG Fault AG Fault
BG Fault BG Fault
CG Fault CG Fault
AB Fault No fault
BC Fault No fault
CA Fault No fault
AB Fault AB Fault
BC Fault BC Fault
Section 4
RELEASE PP
No fault
No fault
No fault
AB Fault
BC Fault
CA Fault
AB Fault
BC Fault
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