![]() From combined apparent power I could solve the phase current of I2. ![]() S² = P² + Q² wouldn´t apply straight and true. I just felt it can´t be right, because there is kind of two different idle and active powers and from those I should get apparent power. There is something that I don´t understand and I think it concerns calculating Phase L2:s active powers.Īt first I thought that I could calculate current powers together and solve current out of it. Somehow I just feel I didn´t get the exact right answer out of it. And I get 4,5A for a neutral phase current. We draw it in an angle of 60°, because once again power factor is 1. ![]() Last current left, until we can measure the neutral phase current. We will subtract it from that basic angle 60°. This time we have it, and it is as much as cosΦ 0,90, as a degrees, it is 25,84°. If there would be no difference in power factor, the angle would be 60°. Second vector will be drawn continuing from L1 toward L2. I decided to make an vector drawing out of it.įirst vector is the I1 and it goes along L1, because power factor of it is 1. Now I have all three currents that I need to solve neutral phase current. P2x is the 4500W charge and P2y is the 2000W charge (1/3 of that 3-phased boilers power) If I calculate I2 like this, would it be right?įirst I name both charges, so I don´t mix them up. Now we need the I3, so we could make vectors on paper and solve neutral phase current In. I will get back to this later, first I calculate currents of P1 and P3: As far as I have understanding, active powers can´t be summed together in this case. P3 = 1,5kW + 2kW (latter is 1/3 of that 3-phased boiler) = 3,5kW P1 = 3kW + 2kW (latter is 1/3 of that 3-phased boiler) = 5kW This is what i have thought of it this far: I tried to calculate this over 10 hours now, but for some reason I didn´t "get" the idea of it. Calculate phase currents and neutral phase current. L1 - Lightning and heating 3kW L2 - Lightning, heating and motors 4,5kW, power factor cos Φ =0,90 元 - Lightning and heating 1,5kW.Īdditional to those we have a 3-phased boiler that charges our grid with 6,0kW. We have a house with 400/230V grid and in a certain point of time it has charges like these: L2 phase charge has a power factor of cosΦ 0,90. ![]() Three individual charges, each on their own phase and a shared 3-phase charge. LTSpice is a versatile, accurate and free circuit simulator available for Windows and Mac.I am doing a homework that I got yesterday and it concerns calculating phase currents and a neutral phase current. ![]() Recommended Levelīeginner (you should be familiar with analog circuit concepts to get the most out of this article) Getting Started In this article we'll provide an overview of AC and DC simulation, as well as how to analyze output signals. To get a copy of the LTSpice executable, visit the Linear Technology design tools download page here. Once you've installed the program and run it, you'll see a screen like the one below. In order to actually begin drawing a schematic, you'll need to click the little red "LT" icon by the file menu (this creates a new draft):įrom here you can start placing and editing components, but first let's go over some keyboard shortcuts. If you ever get stuck working with LTSpice, there is a pretty comprehensive set of resources available in the Help menu, including more examples regarding usage. Here is a list of some hotkeys for creating your schematic:į5: Delete (press F5 then click the component)ĬTRL+R: Rotate (when component is selected)ĬTRL+E: Mirror (when component is selected) You can find most of these on the toolbar above the circuit window, or in the "Edit" and "View" menus as well, if you prefer to access them that way. Note that CTRL+Z does not undo rather, CTRL+Z and CTRL+B are used for zooming in and out, respectively. Pressing space is "zoom to fit", which sizes your viewing area nicely. Now we'll start placing components and simulate a simple op-amp summing amplifier. Press F2 to access the component menu, which is where you'll find voltage sources and op-amp models. You'll want to enter the "Opamps" subfolder and find the component called "UniversalOpamp2": Check the screenshot below to see the pop-up component window (and the finished circuit schematic). Next you'll want to reopen the component menu and place a total of five voltage sources from the top level of the component menu (you can save time by using the copy hotkey after placing the first). ![]()
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