MR TRAFOGUARD ISM, Operating Instructions Manual

Page: 98 / 224

6 Functions and settings
Maschinenfabrik Reinhausen GmbH 2016 98 5163667/00 EN TRAFOGUARD® ISM®
Circuit A: 1-phase measurement in 1-phase grid
▪ The voltage transformer VT is connected to the phase conductor and
neutral conductor.
▪ The current transformer CT is looped into the phase conductor.
▪ The voltage U
L1
and current I
L1
are in phase.
▪ The voltage drop on a phase conductor is determined by the current I
L1
.
If you use this circuit, set the device as follows:
Parameter Option
Voltage-transformer circuit 1 Ph phase voltage
Current-transformer circuit 1 Ph phase current
Phase angle correction 0°
Table 14: Circuit A: 1-phase measurement in 1-phase grid
Circuit B: 1-phase measurement in 3-phase grid
▪ The voltage transformer VT is connected to the phase conductor L1 and
the neutral conductor.
▪ The current transformer CT is looped into the phase conductor L1.
▪ The voltage U and current I are in phase.
▪ The voltage drop on a phase conductor is determined by the current I
L1
.
If you use this circuit, set the device as follows: