3UG4.1 line monitoring relay
6.7 3UG4617 / 3UG4618 line monitoring relays
3UG4 / 3RR2 monitoring relays
Manual, 05/2016, NEB927043002000/RS-AC/004
157
6.7.2
Functions
General functionality
The 3UG4617 line monitoring relays monitor a three-phase system for phase sequence,
phase failure, phase asymmetry, undervoltage, and overvoltage.
Note
The 3UG4618 line monitoring relays have the same functions as the 3UG4617 monitoring
relays and also monitor the neutral conductor for failure.
The devices feature a wide-range voltage input and are self-powered (measuring voltage
= rated control supply voltage) and work on the closed-circuit principle. Depending on the
version, the line monitoring relays are powered with a line-to-line voltage of 160 to 690 V
(3UG4617) and with a line-to-neutral voltage of 90 to 400 V (3UG4618) through terminals
L1 / L2 / L3.
The 3UG4617 / 3UG4618 line monitoring relays have a display and are parameterized with
three keys.
You will find the setting ranges and factory settings of the available parameters in Chapter
"Operation (Page 161)."
You will find a description of the individual parameters in Chapter "Parameters (Page 363)."
Note
The specified voltages represent the absolute thresholds.