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% Impedance = Impedance of the transformer.

Air conditioning efficiency : EER, SEER, and COP conversion. Kindly show the computation. If you wanted to do all your calculations in kW, you could - but you would need to include the power factor as well in any calculation.

If remembering is formulae more easy, just go with that. The voltage coming out of the plug socks is not constantly 120, 220, 230 or 240V.

uses 50Hz.


System voltages and currents can be found by drawing out the circuit in full detail and using Kirchhoff's laws and other network theorems. I'm just holding off on posting as the upgrading of site is going really well. I = 249/(1.73*0.72*380) = 0.52 A In the US we get 120V from a single phase or 208V from two or three phases.Europe we get 230V single phase or 400VAustralia and India we get 230V single phase or 400V. If you want to calculate energy associated to this active power, fill the I have now changed it to show kVA. Assuming delta connected, the line voltage is across each phase and the current is 56,000/240 = 230 A.

I know this probably is easy to understand, but I got myself to a completely confused state.

Note: If they mention in single phase 230 volts, then it means the potential difference the phase to neutral is 230 volts. I pretty sure the formula given is correct.

Series and Parallel arrangements are two basic configurations in which we can arrange the electrical components.   I= S 1ph V LN = P 3×pf 3 V LL, Simplifying (and with 3 = √3 x √3):      You can't divide the current by three (power kW or kVA - yes). Current won't flow through the fault to the load (or very little will).    I= P 3 ×pf× V LL. If the voltage supplied from the grid changes within acceptable tolerances, say 5%, what would you expect will happen to the Power (kW) which I measure?. But I think I’ve understood it now. North America some of In the US the voltage at the socket reaches 170V Europe reaches 325V India and Australia reach 325V. We call the larger voltage our line to line voltage and we get that by connecting between any two phases.         U=P/(I*cosφ), P = power in watt (W)

Introduction to Three Phase Electric Power, Cables for MV Power Distribution - Earthed versus Unearthed Systems, 8 Steps to Low Voltage Power Cable Selection and Sizing, Thermoplastic and Thermosetting Insulation, Click here to view the notes list in a table format, Click here to view the notes indexed by tag, have a question or need help, please use our, spotted an error or have additional info that you think should be in this post, feel free to. After looking at the above post, please let me know if it makes more sense or if you still need a better explanation. We'll assume you're ok with this, but you can opt-out if you wish. I always mess them up.

Steven, let me give you a few more details. I have a small 400 V three phase 4 wire (star) installation with the following resistive loads on each; I need to calculate the line current in each of the three phases can some one please help with a formula?

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