Furnace

215

01:34:16

This is a simplified furnace diagram. I am really confused at h ow to set this up. I am confused why I have to set the phase angle to 0, 60 and 120 degrees. I thought it should be 0, 120, and 240 degrees. This is three phase power coming from a wye transformer.  When I look at the current graphs they do not look correct. It is 3 phase 12.8V RMS coming from the wye transformer. I know my element resisitances. There is actually 12 elements per phase but I have reduced it to just one resistor per phase. If I calculate power... 2030A * 12.8V *1.73 =  44,952 VA. This is not correct according to other calculations I have. The current should be 3511.21 A giving 77,764 VA.

published 3 years ago

guillianj

3 years ago

The graph doesn’t look right because one of the currents is being measured in the opposite direction. Everycircuit decides the direction of measured current based on what direction it is flowing when you start the simulation. Just put A-meters in series with the sources.

guillianj

3 years ago

Oh yea and the phases are messed up because the top voltage source is upside down. You can see it if you switch all of them to DC. Everycircuit doesn’t show you the orientation of AC sources so it’s better to place them as DC and then change parameters to AC. When you fix that it looks as it should with 0, 120 and 240.

hammerpe33

3 years ago

Got it great thank you I will try that. I also found my stupidity in things not lining up with my spreadsheet. I was entering line voltage at the AC sources instead of phase voltage. I added in a line to line volt meter and that is what made me realize my mistake.

hammerpe33

3 years ago

I just found out you CAN flip the A/C voltage source. If you click on the voltage source you can hit the flip symbol. Then I can put in 0, 120 and 240 and all is good. Thank you for your help.

guillianj

3 years ago

Yeah but without seeing it as a DC supply first the placement is ambigous. They should really put a little + sign on one of the terminals or something.

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