Why the block "Three-Phase Series RLC Load" creates the current values twice as much on each phase?
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Frequency: 50Hz. Nominal phase-to-phase voltage of Source: Unom(ph-ph)=400(V). Nominal phase voltage of Source: Unom(ph)=400/(3^0.5)=230.940(V). Nominal phase-to-phase voltage of Load in Volts RMS: 400/(2^0.5)=282.843(Vrms). Active power of Load: P=576e3(W). Inductive reactive power of Load: QL=300e3(var). Capacitive reactive power of Load: Qc=21.03e3(var). By calculation through known equation we get apparent power:S=[P^2+(QL-Qc)^2]^0.5=640e3(VA).Then we can get the current value per phase: I=S/[Unom(ph-ph)*3^0.5]=924(A). In Amperes RMS: Irms=I/(2^0.5)=653(Arms). In according with measuring current value in Amperes RMS obtaining from amperemeter (current measurement) and shown at displays, we get twice as much phase current: 1306(Arms). Although on calculation conducted phase current must be 653(Arms).
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/191299/image.jpeg)
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/191300/image.jpeg)
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Risposte (1)
Joel Van Sickel
il 2 Set 2020
Hello Murat,
for your model, you are simulating with a 400V peak to peak line voltage. However, your calculations are for a 400V RMS line voltage.
Regards,
Joel
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