my question is do i need to multiply 80.6a to 1.732 to convert in 3 phase? And now I would like to know how does the calculation works when a generator has to be used? Three phase system - The main difference between a three phase system and a single phase system is the voltage. Generally when people talk about power factor, they are concerned with the overall system. thanks.. You don't need to combine the current - just take the worse case line current for sizing cables/breakers. The rise and fall of circuit values such as voltage and current in response to a transient is, as was mentioned before, asymptotic. The product of the voltage and current is the apparent power and measured in VA (or kVA) . The rpm does not affect it. Easy enough. By using a table to list all voltages, currents, and resistance in the circuit, it becomes very easy to see which of those quantities can be properly related in any Ohm’s Law equation: The rule with such a table is to apply Ohm’s Law only to the values within each vertical column. thank you very much for the reply, but how to calculate the total ampere of the system, if A phase 80.6A, B phase 65.8A, C phase 73.2A. She holds an Associate of Applied Science in electrical engineering technology. If you understand that definition fully, then the rules are nothing more than footnotes to the definition. In the three-resistor example circuit below, we know that we have 9 volts between points 1 and 4, which is the amount of electromotive force driving the current through the series combination of R1, R2, and R3. How can I calculate power factor(pf) if I know the kW, V, Hz and reactive power?For a three phase AC generator.Thanks. If the voltages become unbalanced or there are other considerations (i.e. The 9 volts of battery voltage is not applied directly across R1, R2, or R3. If the 491.5A is an existing or additional loads to the 80.6A, you would need to add to get the total current (i.e. Current is the flow of electrically charged carriers like electrons or the flow of charge per unit of time. In summary, a series circuit is defined as having only one path through which current can flow. Why is the Y and Delta line current the same? If you interested in an introduction you can view our post: Network Theory – Introduction and Review. Create one now. 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? Now we have all the necessary information to calculate circuit current because we have the voltage between points 1 and 4 (9 volts) and the resistance between points 1 and 4 (18 kΩ): Calculating Component Voltages Using Ohm’s Law.