Overview
The “Phase undervoltage” element is used to give a time-delay operating characteristic versus the applied fundamental voltage (phase-toground or phase-to-phase for wye VT connection, or phase-to-phase for delta VT connection) or as a definite time element. The element resets instantaneously if the applied voltage exceeds the dropout voltage.
For more detailed information on “Phase undervoltage” 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 |
| All except B90, C30, T35 | 4725 | Phase Undervoltage 1 Function | 0 to 1 | — | 1 | F102 | 0 (Disabled) |
| " | 4726 | Phase Undervoltage 1 Signal Source | 0 to 5 | — | 1 | F167 | 0 (SRC 1) |
| " | 4727 | Phase Undervoltage 1 Pickup | 0.004 to 3 | pu | 0.001 | F001 | 1000 |
| " | 4728 | Phase Undervoltage 1 Curve | 0 to 1 | — | 1 | F111 | 0 (Definite Time) |
| " | 4729 | Phase Undervoltage 1 Delay | 0 to 600 | s | 0.01 | F001 | 100 |
| " | 472A | Phase Undervoltage 1 Minimum Voltage | 0 to 3 | pu | 0.001 | F001 | 100 |
| " | 472B | Phase Undervoltage 1 Block | 0 to 4294967295 | — | 1 | F300 | 0 |
| " | 472D | Phase Undervoltage 1 Target | 0 to 2 | — | 1 | F109 | 0 (Self-reset) |
| " | 472E | Phase Undervoltage 1 Events | 0 to 1 | — | 1 | F102 | 0 (Disabled) |
| " | 472F | Phase Undervoltage 1 Measurement Mode | 0 to 1 | — | 1 | F186 | 0 (Phase to Ground) |
| " | 4730 | Reserved (6 items) | 0 to 1 | — | 1 | F001 | 0 |
| " | 4736 | …Repeated for Phase Undervoltage 2 | |||||
| " | 4747 | …Repeated for Phase Undervoltage 3 | |||||
| B30 | 4758 | …Repeated for Phase Undervoltage 4 | |||||
| " | 4769 | …Repeated for Phase Undervoltage 5 | |||||
| " | 477A | …Repeated for Phase Undervoltage 6 |
| F102 | 0 = Disabled, 1 = Enabled | ||||||
| F109 | 0 = Self-reset, 1 = Latched, 2 = Disabled | ||||||
| F111 | 0 = Definite Time, 1 = Inverse Time | ||||||
| F167 | 0 = SRC 1, 1 = SRC 2, 2 = SRC 3, 3 = SRC 4, 4 = SRC 5, 5 = SRC 6 | ||||||
| F168 | 0 = Disabled, 1 = Adapt. 2nd, 2 = Trad. 2nd | ||||||
Logics & highlights
Phase undervoltage1 logic
