6.6.2 Functions
General functionality
The 3UG4615 line monitoring relays monitor a three-phase system for phase
failure, undervoltage, overvoltage, and phase sequence.
Note
The 3UG4616 line monitoring relays have the same functions as the 3UG4615 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). Depending on the version, the line monitoring relays are
powered with a line-to-line voltage of 160 to 690 V (3UG4615) or with a line-to-neutral voltage
of 90 to 400 V (3UG4616) through terminals L1 / L2 / L3.
The 3UG4615 / 3UG4616 line monitoring relays feature 2 output relays (output relay K1 and
output relay K2).
The 3UG4615 / 3UG4616 line monitoring relays have a display and are parameterized with three
keys.
You will nd the setting ranges and factory settings of the available parameters in Chapter
"Operation (Page 107)."
You will nd a description of the individual parameters in Chapter "Parameters (Page 281)."
Note
The specied voltages represent the absolute thresholds.
Monitoring
The 3UG4615 / 3UG4616 line monitoring relays have two output relays. With output relay K1,
a three-phase system is monitored for undervoltage. With output relay K2, a three-phase system
is monitored for overvoltage.
The output relays respond in accordance with the set relay switching behavior (closed-circuit
principle NC or open-circuit principle NO).
If a fault occurs (phase failure, incorrect phase sequence, voltage undershoot or voltage
overshoot), the output relays switch in accordance with the relay switching behavior. In the case
of voltage undershoot or voltage overshoot, the output relays do not respond until expiry of the
set tripping delay time (U▼Del and U▲Del).
In the case of incorrect direction of rotation, the devices immediately shut down.
The display indicates the following voltages in the case of the line monitoring relays:
• 3UG4615: Line-to-line voltage between L1 and L2, L1 and L3, L2 and L3
• 3UG4616: Line-to-neutral voltage between L1 and N, L2 and N, L3 and N
3UG4.1 line monitoring relay
6.6 3UG4615 / 3UG4616 line monitoring relays
SIRIUS 3UG4 / 3RR2 monitoring relay
Equipment Manual, 07/2021, NEB927043002000/RS-AD/005 105
To Next Page
Loading...
Need help?
General