Overview
Generally, the “Directional comparison blocking” scheme 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. By default, this scheme uses only a forward-looking over-reaching zone 2 distance element to identify forward faults.
For more detailed information on “Directional comparison blocking” scheme, 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 |
| D60, L90 | 42AB | Blocking Scheme 1P Function | 0 to 1 | — | 1 | F102 | 0 (Disabled) |
| " | 42AC | Block 1P Rx Coord Pickup Delay | 0 to 65.535 | s | 0.001 | F001 | 10 |
| " | 42AD | Block 1P Transient Block Pickup Delay | 0 to 65.535 | s | 0.001 | F001 | 30 |
| " | 42AE | Block 1P Transient Block Reset Delay | 0 to 65.535 | s | 0.001 | F001 | 90 |
| " | 42AF | Blocking Scheme 1P Seal In Delay | 0 to 65.535 | s | 0.001 | F001 | 0 |
| " | 42B0 | Blocking Scheme 1P Gnd Directional Overcurrent Fwd | 0 to 4294967295 | — | 1 | F300 | 0 |
| " | 42B2 | Blocking Scheme 1P Gnd Directional Overcurrent Rev | 0 to 4294967295 | — | 1 | F300 | 0 |
| " | 42B4 | Blocking Scheme 1P Number of Communication Bits | 0 to 2 | — | 1 | F198 | 0 (1) |
| " | 42B5 | Blocking Scheme 1P Rx1 | 0 to 4294967295 | — | 1 | F300 | 0 |
| " | 42B7 | Blocking Scheme 1P Rx2 | 0 to 4294967295 | — | 1 | F300 | 0 |
| " | 42B9 | Blocking Scheme 1P Rx3 | 0 to 4294967295 | — | 1 | F300 | 0 |
| " | 42BB | Blocking Scheme 1P Rx4 | 0 to 4294967295 | — | 1 | F300 | 0 |
| " | 42BD | Blocking 1P Target | 0 to 2 | — | 1 | F109 | 0 (Self-reset) |
| " | 42BE | Blocking 1P Event | 0 to 1 | — | 1 | F102 | 0 (Disabled) |
| " | 42BF | Blocking Scheme 1P Block | 0 to 4294967295 | — | 1 | F300 | 0 |
| " | 42C1 | Reserved (5 items) | 0 to 1 | — | 1 | F001 | 0 |
| F102 | 0 = Disabled, 1 = Enabled | ||||||
| F109 | 0 = Self-reset, 1 = Latched, 2 = Disabled | ||||||
| F198 | 0 = 1, 1 = 2, 2 = 4 | ||||||
Logics & highlights
Directional blocking scheme logic
