Overview
The “Undervoltage” element supervises (low-voltage check) current based main protection (that is, differential, breaker failure, end fault, and time overcurrent backup protection). It also accepts the neutral voltage (3V0) from an open-corner delta VT arrangement. In this case, the FlexLogic output is inverted to accomplish the 3V0 overvoltage functionality.
For more detailed information on “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 |
B90 | 44F3 | Undervoltage 1 Function | 0 to 1 | — | 1 | F102 | 0 (Disabled) |
" | 44F4 | Undervoltage 1 VT | 0 to 11 | — | 1 | F400 | 0 |
" | 44F5 | Undervoltage 1 Pickup | 0.004 to 3 | pu | 0.001 | F001 | 800 |
" | 44F6 | Undervoltage 1 Minimum Voltage | 0 to 1 | pu | 0.001 | F001 | 0 |
" | 44F7 | Undervoltage 1 Pickup Delay | 0 to 65.535 | s | 0.001 | F001 | 0 |
" | 44F8 | Undervoltage 1 Reset Delay | 0 to 65.535 | s | 0.001 | F001 | 0 |
" | 44F9 | Undervoltage 1 Block | 0 to 4294967295 | — | 1 | F300 | 0 |
" | 44FB | Undervoltage 1 Target | 0 to 2 | — | 1 | F109 | 0 (Self-reset) |
" | 44FC | Undervoltage 1 Events | 0 to 1 | — | 1 | F102 | 0 (Disabled) |
" | 44FD | Undervoltage 1 Reserved (2 items) | — | — | — | F001 | 0 |
" | 44FF | …Repeated for Undervoltage 2 | |||||
" | 450B | …Repeated for Undervoltage 3 | |||||
" | 4517 | …Repeated for Undervoltage 4 | |||||
" | 4523 | …Repeated for Undervoltage 5 | |||||
" | 452F | …Repeated for Undervoltage 6 | |||||
" | 453B | …Repeated for Undervoltage 7 | |||||
" | 4547 | …Repeated for Undervoltage 8 | |||||
" | 4553 | …Repeated for Undervoltage 9 | |||||
" | 455F | …Repeated for Undervoltage 10 | |||||
" | 456B | …Repeated for Undervoltage 11 | |||||
" | 4577 | …Repeated for Undervoltage 12 | |||||
F102 | 0 = Disabled, 1 = Enabled | ||||||
F109 | 0 = Self-reset, 1 = Latched, 2 = Disabled | ||||||