Current Transformer
4 - 7
Figure 5:
CTRatio
test card with
selected "Measure
burden" option and test
results
Additional measurements when "Measure burden" is selected
Automatic Test vs. Manual Test
1. Option "Manual input" clear
1
Automatic test
– Press the I/O (test start/stop) push-button to start the test.
The test current increases from 0A to Itest in a ramp characteristic within
1 second. Then Itest is kept for a period of 2.4 seconds, and the
measurements are taken. Next, the ramp decreases again within 0.3 second.
– The automatic test stops by itself, it can now be assessed.
– To repeat the test, first press B
A C K
T O
T
O P
, if applicable, and then C
L E A R
R
E S U L T S
.
Vsec:
measured secondary voltage and phase angle relative to Iprim
Burden:
burden in VA: Isec nom × (Vsec act × Isec nom/Isec act)
cos
ϕ
cosine of angle between Isec and Vsec
1. Refer to ”Three methods to determine I sec” on page 5 of this chapter.
Summary of Contents for CPC 100
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Page 250: ...CPC 100 V1 41 8 32 Figure 24 Settings of Amplifier test card for this example use case...
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Page 282: ...CPC 100 V1 41 12 10 Figure 9 Saving tests with the CPC Editor...
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Page 372: ...OMICRON Contact Addresses 22...
