Overview
The “Directional comparison blocking 3” scheme (DCB3) compares the direction to a fault at all terminals of the line. Unlike the permissive schemes, the absence of a blocking signal permits operation of the scheme. Consequently, the scheme is biased toward dependability and requires an “on/off” type of signaling.
For more detailed information on “Directional comparison blocking 3” scheme (DCB3), refer to GE, Universal Relay (UR) family of products, Version 8.0x manuals.
To see other supported elements, click here.
Setting Parameters
Modbus memory map for Setting parameters
| Products | Hex address | Register name | Range | Units | Step | Format | Default |
| F60 | 6C93 | DCB3 Scheme Function | 0 to 1 | — | 1 | F102 | 0 (Disabled) |
| " | 6C94 | DCB3 Scheme Block | 0 to 4294967295 | — | 1 | F300 | 0 |
| " | 6C96 | DCB3 Rx Coord Pickup Delay | 0 to 65.535 | s | 0.001 | F001 | 10 |
| " | 6C97 | DCB3 Trans Block Pickup Delay | 0 to 65.535 | s | 0.001 | F001 | 30 |
| " | 6C98 | DCB3 Trans Block Reset Delay | 0 to 65.535 | s | 0.001 | F001 | 90 |
| " | 6C99 | DCB3 Scheme Seal In Delay | 0 to 65.535 | s | 0.001 | F001 | 10 |
| " | 6C9A | DCB3 Dir Fwd1 | 0 to 4294967295 | — | 1 | F300 | 0 |
| " | 6C9C | DCB3 Dir Fwd2 | 0 to 4294967295 | — | 1 | F300 | 0 |
| " | 6C9E | DCB3 Dir Fwd3 | 0 to 4294967295 | — | 1 | F300 | 0 |
| " | 6CA0 | DCB3 Dir Rev1 | 0 to 4294967295 | — | 1 | F300 | 0 |
| " | 6CA2 | DCB3 Dir Rev2 | 0 to 4294967295 | — | 1 | F300 | 0 |
| " | 6CA4 | DCB3 Dir Rev3 | 0 to 4294967295 | — | 1 | F300 | 0 |
| " | 6CA6 | DCB3 Force Tx Stop1 | 0 to 4294967295 | — | 1 | F300 | 0 |
| " | 6CA8 | DCB3 Force Tx Stop2 | 0 to 4294967295 | — | 1 | F300 | 0 |
| " | 6CAA | DCB3 Rx | 0 to 4294967295 | — | 1 | F300 | 0 |
| " | 6CAC | DCB3 Scheme Target | 0 to 2 | — | 1 | F109 | 0 (Self-reset) |
| " | 6CAD | DCB3 Scheme Events | 0 to 1 | — | 1 | F102 | 0 (Disabled) |
| F102 | 0 = Disabled, 1 = Enabled | ||||||
| F109 | 0 = Self-reset, 1 = Latched, 2 = Disabled | ||||||
Logics & highlights
DCB3 scheme logic
