Overview
The “Stub bus” element protects for faults between two breakers in a breaker-and-a-half or ring bus configuration when the line disconnect switch is open. At the same time, if the line is still energized through the remote terminal(s), differential protection is still required (the line can still need to be energized because there is a tapped load on a two-terminal line or because the line is a three-terminal line with two of the terminals still connected).
For more detailed information on “Stub bus” element, 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 |
| L30, L90 | 3D26 | Stub Bus Function | 0 to 1 | — | 1 | F102 | 0 (Disabled) |
| " | 3D27 | Stub Bus Disconnect | 0 to 4294967295 | — | 1 | F300 | 0 |
| " | 3D29 | Stub Bus Trigger | 0 to 4294967295 | — | 1 | F300 | 0 |
| " | 3D2B | Stub Bus Target | 0 to 2 | — | 1 | F109 | 0 (Self-reset) |
| " | 3D2C | Stub Bus Events | 0 to 1 | — | 1 | F102 | 0 (Disabled) |
| F102 | 0 = Disabled, 1 = Enabled | ||||||
| F109 | 0 = Self-reset, 1 = Latched, 2 = Disabled | ||||||
Logics & highlights
Stub bus logic
