18
UMG 512
Voltage measurement
Three-phase 4-conductor systems
The UMG 512 can be used in three-phase 4-conductor
systems (TN, TT networks) with an earthed neutral
conductor. The bodies of the electrical system are
earthed.
The voltage measurement in the UMG 512 is designed
for the overvoltage category 600V CAT III (measurement
voltage surge 6kV).
Three-phase 3-conductor systems
The UMG 512 is only suitable to a limited extent for use
in IT networks, since the measured voltage relative to the
housing potential is measured and the input impedance
of the device creates residual current against the earth.
The residual current can trigger the insulation monitoring
in IT networks.
The connection variants with voltage transformers are
suitable for unlimited use in IT networks.
PE
347V/600V 50/60Hz
L2
L3
N
L1
N
L1
240V
50/60Hz
System
earthing
DC
AC/DC
Auxilliary power
Voltage measurement
4M
4M
4M
4M
V1
V3
V2
Vref
4M
V4
UMG 512
Fig. Schematic diagram, UMG 512 in a
TN network
.
Fig. Schematic diagram, UMG 512 in an
IT network
without N.
600V 50/60Hz
DC
AC/DC
L2
L3
Auxilliary power
Voltage measurement
4M
4M
4M
4M
V1
V3
V2
4M
V4
System
earthing
Impedance
L1
UMG 512
Vref
Содержание UMG 512
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