ABB RELION REX640 - Page 959

“No filter” option does not block the single-phase earth-faults, therefore
this option should be used with caution.
Table 915: Supported phase preference logic schemes for high-impedance earthed networks and
their operation in case of single phase start with and without cross-country fault detection
Ph Prf mode Hi Z GFC Faulted loops
A &
EARTH_FLT
B &
EARTH_FLT
C &
EARTH_FLT
A & XC_FLT B & XC_FLT C & XC_FLT
RELEASE_PE RELEASE_PP
1 No filter AG Fault BG Fault CG Fault AG Fault BG Fault CG Fault
2 No preference No fault No fault No fault AG Fault BG Fault CG Fault
3 Cyc A-B-C-A No fault No fault No fault AG Fault BG Fault CG Fault
4 Cyc A-C-B-A No fault No fault No fault AG Fault BG Fault CG Fault
5 Acyc A-B-C No fault No fault No fault AG Fault BG Fault CG Fault
6 Acyc A-C-B No fault No fault No fault AG Fault BG Fault CG Fault
7 Acyc B-A-C No fault No fault No fault AG Fault BG Fault CG Fault
8 Acyc B-C-A No fault No fault No fault AG Fault BG Fault CG Fault
9 Acyc C-A-B No fault No fault No fault AG Fault BG Fault CG Fault
10 Acyc C-B-A No fault No fault No fault AG Fault BG Fault CG Fault
Table 916: Supported phase preference logic schemes for high-impedance earthed networks and
their operation in case of two phase starts without cross-country fault detection
Ph Prf mode Hi Z GFC
Faulted loops
A & B
EARTH_FLT
B & C
EARTH_FLT
C & A
EARTH_FLT
A & B
EARTH_FLT
B & C
EARTH_FLT
C & A
EARTH_FLT
RELEASE_PE RELEASE_PP
1 No filter AB Fault BC Fault CA Fault AB Fault BC Fault CA Fault
2 No preference No fault No fault No fault AB Fault BC Fault CA Fault
3 Cyc A-B-C-A No fault No fault No fault AB Fault BC Fault CA Fault
4 Cyc A-C-B-A No fault No fault No fault AB Fault BC Fault CA Fault
5 Acyc A-B-C No fault No fault No fault AB Fault BC Fault CA Fault
6 Acyc A-C-B No fault No fault No fault AB Fault BC Fault CA Fault
7 Acyc B-A-C No fault No fault No fault AB Fault BC Fault CA Fault
8 Acyc B-C-A No fault No fault No fault AB Fault BC Fault CA Fault
9 Acyc C-A-B No fault No fault No fault AB Fault BC Fault CA Fault
10 Acyc C-B-A No fault No fault No fault AB Fault BC Fault CA Fault
Table 917: Supported phase preference logic schemes for high-impedance earthed networks and
their operation in case of two phase starts with cross-country fault detection
Ph Pref logic Hi Imp
Faulted loops
A & B XC_FLT B & C XC_FLT C & A XC_FLT A & B XC_FLT B & C XC_FLT C & A XC_FLT
RELEASE_PE RELEASE_PP
1 No filter AB Fault BC Fault CA Fault AB Fault BC Fault CA Fault
2 No preference AB Fault BC Fault CA Fault AB Fault BC Fault CA Fault
3 Cyc A-B-C-A AB Fault BC Fault CA Fault AB Fault BC Fault CA Fault
4 Cyc A-C-B-A AB Fault BC Fault CA Fault AB Fault BC Fault CA Fault
5 Acyc A-B-C AB Fault BC Fault CA Fault AB Fault BC Fault CA Fault
6 Acyc A-C-B AB Fault BC Fault CA Fault AB Fault BC Fault CA Fault
7 Acyc B-A-C AB Fault BC Fault CA Fault AB Fault BC Fault CA Fault
Table continues on the next page
1MRS759142 F Protection functions
REX640
Technical Manual
959