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Current Transformer
4 - 33
CT RatioV (with Voltage)
Use the
CTRatioV
test card to measure a current transformer’s ratio. To do so,
from the
2kV
AC
output
feed a voltage of up to 500V to the transformer’s
secondary side.
The preferred method for CT ratio measurement is current injection using the
CTRatio
test card. However, on CTs such as some GIS CTs or bushing CTs on
power transformers where the primary current path is not accessible, the
method described in this section is the only solution.
Both the amplitude of the injected test voltage as well as amplitude and phase
angle of the voltage on the transformer’s primary side
are measured. The
measurements taken are the basis for the calculation of the actual ratio and the
deviation from the nominal ratio.
To measure the CT ratio using the
CTRatioV
test card, connect the
2kV AC
output to the CT’s secondary winding and the
V2 AC
input to the main
conductors, for example, on a power transformer to the transformer’s bushings
of different phases.
Figure 20:
Setup for testing the
ratio and polarity by
measuring the voltage
ratio
Содержание CPC 100
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Страница 250: ...CPC 100 V1 41 8 32 Figure 24 Settings of Amplifier test card for this example use case...
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Страница 370: ...CPC 100 V1 41 17 20 7 Finish the assembly by screwing the backnut to the housing and by tightening them with wrenches...
Страница 372: ...OMICRON Contact Addresses 22...