Current transformers and Power Line ... - Allstar Magnetics
Current transformers and Power Line ... - Allstar Magnetics
Current transformers and Power Line ... - Allstar Magnetics
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Combined Core CT<br />
Combined core (2 core parts):<br />
• one high-permeability core part for AC operation<br />
• one non-linear low permeability core part for operation under DC components<br />
Meter with combined core CT behaves very sensitive.<br />
Measurement accuracy: current IEC-test <strong>and</strong> proposal<br />
20.00<br />
test B (combined core)<br />
15.00<br />
error (%)<br />
10.00<br />
5.00<br />
0.00<br />
0 5 10 15 20<br />
25<br />
-5.00<br />
-10.00<br />
-15.00<br />
cos <br />
0.5i<br />
0.8i<br />
0.9i<br />
1<br />
0.9k<br />
-20.00<br />
half-wave current (A)<br />
• IEC-test cos = 1<br />
satisfactory<br />
• proposal cos ≠ 1<br />
Error data between +18 % <strong>and</strong> -7,5 %<br />
Result: <strong>Power</strong> measurement depends strongly on load phase <strong>and</strong> DC components!<br />
<strong>Current</strong> Transformers <strong>and</strong> <strong>Power</strong> <strong>Line</strong> Transformers for Smart Metering<br />
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