Look at the table of motor kW to cable size chart. The chart is prepared based on the direct online start and star-delta starting. Note that, using aluminium cable for low rating motor up to 1.5kW/2HP motor is not recommended. Here 2R indicates Two Run cables. The cable size chart is suitable for both single-phase and three-phase. 3 phase 5 kVA isolation transformer is designed to step down/ up the voltage 480V to 400V, and widely used in various power supply sites with frequency 50Hz or 60Hz. The 5kVA isolation transformer is high quality, three phase, 480V primary voltage and 400V secondary voltage, manufactured direct sale. Fully compliant with reduced low voltage System Voltage: Choose from dropdown list voltage with respect to system AC 6kV, AC 3kV, AC 400V, AC 380V, AC 230V, AC 220V, DC 110V, DC 24V or DC 12V ; Load Rating: Input load rating in kW or kVA. Should kVA is used, power factor is 1 (unity) in next step; Power factor: Power factor of AC load, use 1 (unity) for DC load Power factor correction is the hidden biggy with any powerful 3 phase AC to DC converter. It’s simply not the case that the rather elegant 3 phase rectifier circuit can be piggy backed with a boosting power factor correction circuit. This will not work. An Inverter Drive is not only able to convert a 230V single phase supply to 230V 3 phase but it also controls both the output Frequency and Voltage to maintain the correct ratio. It therefore follows that a 400V/50Hz Motor will operate normally at 230V and 29Hz, just at two thirds the speed (eg. 1000rpm instead of 1500rpm). An 11kV transformer is an example of a power transformer. Transformers work to improve the efficiency and safety of electrical power systems by stepping up or stepping down voltage levels as needed. They are mainly used for power regulation and distribution in most residential and industrial applications, especially long distances. After all the cells are filled with the appropriate values, you can click on the ‘Calculate' button to execute the conversion. Formula for calculating the three phase I (A) =1000 x S (VA) / (√3 x V L-L (V)) = S (VA) / (3 x V L-N (V)), which means that the current in amps is calculated by multiplying 1000 by the apparent power in volt-amps. Anonymous. May 25, 2007. #1. I need to build a enclosure to house a 3ph speed drive. To dissipate the heat inside, I will need to install 2 units of panel fans which requires 230V single-phase to run. However, only 3ph 400V w/o neutral supply is available. So, I was thinking of putting in a 400V to 230V transformer, but understanding that the \$\begingroup\$ I wouldn't be confident either way. The brochure implies 200-230V phase to phase. Taiwan uses 110V phase to neutral which is 190V phase to phase. The 200-230 figure to me implies it's a badly described 220V phase to neutral (380 odd phase to phase) but frankly I wouldn't dare connect it up without contacting the manufacturer for clarification, in case the wrong guess results in V (V) = P (W) I (A) × PF. For an AC circuit, the voltage V in volts is equal to the real power P in watts divided by the product of the current I in amps and the power factor. For example, let’s convert 1,300 watts to voltage for an AC electrical circuit with 12 amps of current and a power factor of 0.9. V(V) = 1,300 W ÷ (12 A × 0.9) op4Wgz.