ABB RELION REX640 - Direction 1 to 2 check; Direction 2 to 1 check

POSOPN_CB1
POSCLS_CB1
POSOPN_CB2
POSCLS_CB2
RDYOPN_CB1
RDYCLS_CB1
RDYOPN_CB2
RDYCLS_CB2
TR_1_2_OK
TR_2_1_OK
LAST_TR_1_2
LAST_TR_2_1
Direction
1 to 2
check
Direction
2 to 1
check
Figure 934: Module diagram for Transfer direction
Direction 1 to 2 check
Breaker position information for feeder 1 is obtained from POSOPN_CB1 and
POSCLS_CB1 inputs. Circuit breaker readiness to open and close are defined with
inputs RDYOPN_CB1 and RDYCLS_CB2.
If the CB1 is closed and CB2 is open, CB1 is ready to open and CB2 is ready close,
then TR_1_2_OK is TRUE, meaning transfer from feeder 1 to feeder 2 is allowed
(
Figure 935 , left side).
All other combinations of CB status will set TR_1_2_OK FALSE.
TR_1_2_OK – TRUE when present direction of transfer is from feeder 1 to
feeder 2 and stand-by feeder is feeder 2.
LAST_TR_1_2 output shows if the last valid transfer has been from feeder
1 to feeder 2.
Direction 2 to 1 check
Breaker position information for feeder 2 is obtained from POSOPN_CB2 and
POSCLS_CB2 inputs. Circuit breaker readiness to open and close are defined with
inputs RDYCLS_CB1 and RDYOPN_CB2.
If the CB2 is closed and CB1 is open, CB2 is ready to open and CB1 is ready to close,
then TR_2_1_OK is TRUE, meaning transfer from feeder 2 to feeder 1 is allowed
(
Figure 935 , right side).
All other combinations of CB status will set TR_2_1_OK to FALSE.
TR_2_1_OK – TRUE when present direction of transfer is from feeder 2 to
feeder 1 and stand-by feeder is feeder 1.
LAST_TR_2_1 output shows if the last valid transfer has been from feeder
2 to feeder 1.
Control functions 1MRS759142 F
1764 REX640
Technical Manual