GE / Third harmonic neutral undervoltage (ANSI 27TN) _ Element settings & highlights _ GU8055

Overview

The “Third harmonic neutral undervoltage” element detects a loss of third harmonic voltage at the generator neutral. The percentage of stator winding covered by this function depends on the pickup setting and the amount of third harmonic generated by the machine at the time of the fault. A settable window of forward power can supervise this element for enhanced security.

For more detailed information on “Third harmonic neutral 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

Stator Ground Source element

Products	Hex address	Register name	Range	Units	Step	Format	Default
G30, G60	41A2	Stator Ground Source	0 to 5	—	1	F167	0 (SRC 1)

F167	0 = SRC 1, 1 = SRC 2, 2 = SRC 3, 3 = SRC 4, 4 = SRC 5, 5 = SRC 6

Third harmonic neutral undervoltage element

Products	Hex address	Register name	Range	Units	Step	Format	Default
G30, G60	4180	Third Harmonic Neutral Undervoltage Function	0 to 1	—	1	F102	0 (Disabled)
"	4181	Third Harmonic Neutral Undervoltage Pickup	0.001 to 3	pu	0.000 1	F003	3000
"	4183	Third Harmonic Neutral Undervoltage Delay	0 to 600	s	0.01	F001	0
"	4184	Third Harmonic Neutral Undervoltage Max Power	0 to 1.25	pu	0.001	F003	200
"	4186	Third Harmonic Neutral Undervoltage Min Power	0 to 1.25	pu	0.001	F003	200
"	4188	Third Harmonic Neutral Undervoltage Volt Supervision	0 to 1.25	pu	0.001	F001	500
"	4189	Third Harmonic Neutral Undervoltage Block	0 to 4294967295	—	1	F300	0
"	418B	Third Harmonic Neutral Undervoltage Target	0 to 2	—	1	F109	0 (Self-reset)
"	418C	Third Harmonic Neutral Undervoltage Events	0 to 1	—	1	F102	0 (Disabled)
"	418D	Reserved (4 items)	0 to 65535	—	1	F001	0

F102	0 = Disabled, 1 = Enabled
F109	0 = Self-reset, 1 = Latched, 2 = Disabled