7 Operation
Maschinenfabrik Reinhausen GmbH 2019
128
5163667/06 EN
ETOS
®
IM
▪ Three-phase voltage measurement, single-phase current measurement.
▪ The voltage transformers are connected between the phase and neutral
conductor.
▪ The current transformer is connected to phase L3.
Parameter
Option
Voltage-transformer circuit
3 Ph phase voltage
Current-transformer circuit
3 Ph phase current
Phase angle correction
120°
UI measuring channels
3-ph. voltage, 1-ph. current
Measurement mode
Phase-neutral
Table 35: Circuit 3-H
7.4.2.3 Special applications
The following circuits (S-1, S-2, S-3 and S-4) describe special cases of cur-
rent measurement for hot-spot calculation on 3 different windings (e.g. three-
winding transformer or transformer with tertiary winding).
Only use these circuits in symmetrical grids. Note that you must always take
the W1 voltage and current measurements on the low-voltage side of the
transformer.
▪ W1: Voltage measurement and current measurement for the power calcu-
lation and hot-spot calculation on winding 1
▪ W2: Current measurement for hot-spot calculation on winding 2
▪ W3: Current measurement for hot-spot calculation on winding 3
Summary of Contents for ETOS IM
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