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Most examples on the internet and in my text books contain 1 load with 1 source. I have yet to come across an example with 3 loads. Is there a way of combining the loads?


You know the line voltage so you can calculate the phase voltage and work out what line current the star load is taking per phase. You know what the delta load is so you can calculate the line current for it.

Add the two together to get total line current of the first two loads then subtract that from the total supply line current to get the current taken by the unknown load. The current that remains and the phase voltage define the impedance of the unknown load.

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  • \$\begingroup\$ how would one draw this? \$\endgroup\$ – Rene Mar 21 '18 at 10:26
  • \$\begingroup\$ @Rene I'm not sure what you mean. Do you mean how to draw a circuit or how to draw a delta or star load or how to draw several star and delta loads connected to a 3 phase supply or.....? \$\endgroup\$ – Andy aka Mar 21 '18 at 10:32
  • \$\begingroup\$ Sorry wasnt very clear on that.. I meant how to draw the circuit in the question. I dont understand how it would look. Maybe if I can wrap my head around that I'll be able to get my thoughts together \$\endgroup\$ – Rene Mar 21 '18 at 10:37
  • \$\begingroup\$ The star load is just resistors (hence the angle of 0 degrees) and the delta load is capacitors hence the +90 degrees. \$\endgroup\$ – Andy aka Mar 21 '18 at 10:42
  • \$\begingroup\$ So I just draw resistors and capacitors in series? \$\endgroup\$ – Rene Mar 21 '18 at 10:45

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