Overview
The “Interlocking for a double busbar double circuit breaker bay (including DB_BUS_A, DB_BUS_B and DB_LINE)” functions are used for a line connected to a double busbar arrangement according to the below Switchyard layout.

For more detailed information on “Interlocking for a double busbar double circuit breaker bay (including DB_BUS_A, DB_BUS_B and DB_LINE)” functions, refer to ABB, Relion 670 Series manuals.
To see other supported functions, click here.
Functions Identification
| Function description | IEC 61850 identification |
IEC 60617 identification |
ANSI/IEEE C37.2 device number |
| Interlocking for double CB bay | DB_BUS_A | – | 3 |
| Interlocking for double CB bay | DB_BUS_B | – | 3 |
| Interlocking for double CB bay | DB_LINE | – | 3 |
Signals
DB_BUS_A function block

DB_BUS_A Input signals
| DB_BUS_A Input signals | |||
| Name | Type | Default | Description |
| QA1_OP | BOOLEAN | 0 | QA1 is in open position |
| QA1_CL | BOOLEAN | 0 | QA1 is in closed position |
| QB1_OP | BOOLEAN | 0 | QB1 is in open position |
| QB1_CL | BOOLEAN | 0 | QB1 is in closed position |
| QB61_OP | BOOLEAN | 0 | QB61 is in open position |
| QB61_CL | BOOLEAN | 0 | QB61 is in closed position |
| QC1_OP | BOOLEAN | 0 | QC1 is in open position |
| QC1_CL | BOOLEAN | 0 | QC1 is in closed position |
| QC2_OP | BOOLEAN | 0 | QC2 is in open position |
| QC2_CL | BOOLEAN | 0 | QC2 is in closed position |
| QC3_OP | BOOLEAN | 0 | QC3 is in open position |
| QC3_CL | BOOLEAN | 0 | QC3 is in closed position |
| QC11_OP | BOOLEAN | 0 | Earthing switch QC11 on busbar WA1 is in open position |
| QC11_CL | BOOLEAN | 0 | Earthing switch QC11 on busbar WA1 is in closed position |
| EXDU_ES | BOOLEAN | 0 | No transm error from bay containing earthing switch QC11 |
| QB61_EX1 | BOOLEAN | 0 | External condition for apparatus QB61 |
| QB61_EX2 | BOOLEAN | 0 | External condition for apparatus QB61 |
| QB1_EX1 | BOOLEAN | 0 | External condition for apparatus QB1 |
| QB1_EX2 | BOOLEAN | 0 | External condition for apparatus QB1 |
DB_BUS_A Output signals
| DB_BUS_A Output signals | |||
| Name | Type | Description | |
| QA1CLREL | BOOLEAN | Closing of QA1 is allowed | |
| QA1CLITL | BOOLEAN | Closing of QA1 is forbidden | |
| QB61REL | BOOLEAN | Switching of QB61 is allowed | |
| QB61ITL | BOOLEAN | Switching of QB61 is forbidden | |
| QB1REL | BOOLEAN | Switching of QB1 is allowed | |
| QB1ITL | BOOLEAN | Switching of QB1 is forbidden | |
| QC1REL | BOOLEAN | Switching of QC1 is allowed | |
| QC1ITL | BOOLEAN | Switching of QC1 is forbidden | |
| QC2REL | BOOLEAN | Switching of QC2 is allowed | |
| QC2ITL | BOOLEAN | Switching of QC2 is forbidden | |
| QB1OPTR | BOOLEAN | QB1 is in open position | |
| QB1CLTR | BOOLEAN | QB1 is in closed position | |
| VPQB1TR | BOOLEAN | Switch status of QB1 is valid (open or closed) | |
DB_BUS_B function block

DB_BUS_B Input signals
| DB_BUS_B Input signals | |||
| Name | Type | Default | Description |
| QA2_OP | BOOLEAN | 0 | QA2 is in open position |
| QA2_CL | BOOLEAN | 0 | QA2 is in closed position |
| QB2_OP | BOOLEAN | 0 | QB2 is in open position |
| QB2_CL | BOOLEAN | 0 | QB2 is in closed position |
| QB62_OP | BOOLEAN | 0 | QB62 is in open position |
| QB62_CL | BOOLEAN | 0 | QB62 is in closed position |
| QC4_OP | BOOLEAN | 0 | QC4 is in open position |
| QC4_CL | BOOLEAN | 0 | QC4 is in closed position |
| QC5_OP | BOOLEAN | 0 | QC5 is in open position |
| QC5_CL | BOOLEAN | 0 | QC5 is in closed position |
| QC3_OP | BOOLEAN | 0 | QC3 is in open position |
| QC3_CL | BOOLEAN | 0 | QC3 is in closed position |
| QC21_OP | BOOLEAN | 0 | Earthing switch QC21 on busbar WA2 is in open position |
| QC21_CL | BOOLEAN | 0 | Earthing switch QC21 on busbar WA2 is in closed position |
| EXDU_ES | BOOLEAN | 0 | No transm error from bay containing earthing switch QC21 |
| QB62_EX1 | BOOLEAN | 0 | External condition for apparatus QB62 |
| QB62_EX2 | BOOLEAN | 0 | External condition for apparatus QB62 |
| QB2_EX1 | BOOLEAN | 0 | External condition for apparatus QB2 |
| QB2_EX2 | BOOLEAN | 0 | External condition for apparatus QB2 |
DB_BUS_B Output signals
| DB_BUS_B Output signals | |||
| Name | Type | Description | |
| QA2CLREL | BOOLEAN | Closing of QA2 is allowed | |
| QA2CLITL | BOOLEAN | Closing of QA2 is forbidden | |
| QB62REL | BOOLEAN | Switching of QB62 is allowed | |
| QB62ITL | BOOLEAN | Switching of QB62 is forbidden | |
| QB2REL | BOOLEAN | Switching of QB2 is allowed | |
| QB2ITL | BOOLEAN | Switching of QB2 is forbidden | |
| QC4REL | BOOLEAN | Switching of QC4 is allowed | |
| QC4ITL | BOOLEAN | Switching of QC4 is forbidden | |
| QC5REL | BOOLEAN | Switching of QC5 is allowed | |
| QC5ITL | BOOLEAN | Switching of QC5 is forbidden | |
| QB2OPTR | BOOLEAN | QB2 is in open position | |
| QB2CLTR | BOOLEAN | QB2 is in closed position | |
| VPQB2TR | BOOLEAN | Switch status of QB2 is valid (open or closed) | |
DB_LINE function block

DB_LINE Input signals
| DB_LINE Input signals | |||
| Name | Type | Default | Description |
| QA1_OP | BOOLEAN | 0 | QA1 is in open position |
| QA1_CL | BOOLEAN | 0 | QA1 is in closed position |
| QA2_OP | BOOLEAN | 0 | QA2 is in open position |
| QA2_CL | BOOLEAN | 0 | QA2 is in closed position |
| QB61_OP | BOOLEAN | 0 | QB61 is in open position |
| QB61_CL | BOOLEAN | 0 | QB61 is in closed position |
| QC1_OP | BOOLEAN | 0 | QC1 is in open position |
| QC1_CL | BOOLEAN | 0 | QC1 is in closed position |
| QC2_OP | BOOLEAN | 0 | QC2 is in open position |
| QC2_CL | BOOLEAN | 0 | QC2 is in closed position |
| QB62_OP | BOOLEAN | 0 | QB62 is in open position |
| QB62_CL | BOOLEAN | 0 | QB62 is in closed position |
| QC4_OP | BOOLEAN | 0 | QC4 is in open position |
| QC4_CL | BOOLEAN | 0 | QC4 is in closed position |
| QC5_OP | BOOLEAN | 0 | QC5 is in open position |
| QC5_CL | BOOLEAN | 0 | QC5 is in closed position |
| QB9_OP | BOOLEAN | 0 | QB9 is in open position |
| QB9_CL | BOOLEAN | 0 | QB9 is in closed position |
| QC3_OP | BOOLEAN | 0 | QC3 is in open position |
| QC3_CL | BOOLEAN | 0 | QC3 is in closed position |
| QC9_OP | BOOLEAN | 0 | QC9 is in open position |
| QC9_CL | BOOLEAN | 0 | QC9 is in closed position |
| VOLT_OFF | BOOLEAN | 0 | There is no voltage on the line and not VT (fuse) failure |
| VOLT_ON | BOOLEAN | 0 | There is voltage on the line or there is a VT (fuse) failure |
| QB9_EX1 | BOOLEAN | 0 | External condition for apparatus QB9 |
| QB9_EX2 | BOOLEAN | 0 | External condition for apparatus QB9 |
| QB9_EX3 | BOOLEAN | 0 | External condition for apparatus QB9 |
| QB9_EX4 | BOOLEAN | 0 | External condition for apparatus QB9 |
| QB9_EX5 | BOOLEAN | 0 | External condition for apparatus QB9 |
DB_LINE Output signals
| DB_LINE Output signals | |||
| Name | Type | Description | |
| QB9REL | BOOLEAN | Switching of QB9 is allowed | |
| QB9ITL | BOOLEAN | Switching of QB9 is forbidden | |
| QC3REL | BOOLEAN | Switching of QC3 is allowed | |
| QC3ITL | BOOLEAN | Switching of QC3 is forbidden | |
| QC9REL | BOOLEAN | Switching of QC9 is allowed | |
| QC9ITL | BOOLEAN | Switching of QC9 is forbidden | |
Logics & highlights
Logic diagrams




