Siemens 3UG4 - Functions

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.