Table of Contents

GE / Undervoltage (ANSI 27) _ Element settings & highlights _ GU8068

Table of Contents

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

Logics & highlights


Undervoltage logic

Undervoltage logic

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