As far as line and phase currents are concerned, they are related to each other as: Iline=√3IphaseIline=√3Iphase Which means that whatever supply current we have, we will have wire cross-section for 1/√31/√3times line current only. P 1ph = P 3, Single phase apparent power S1ph (VA): Exposure to time varying magnetic fields, from power frequencies to the gigahertz range can have harmful consequences. ... Voltage drops are phase-to-phase, for three-phase, three-wire or three-phase, four-wire 60 Hz circuits. Thanks for the write up. Easy enough. Sorry if this is a simple question. For example, if the motor is drawing 30 amps at 250 volts, you have 30 x 250 x sqrt 3 (about 1.73) = 12,975 watts). However, if you prefer you can write, manage... GE's latest thinking on product manufacturing is he Shingijutsu philosophy or Lean production system. I thought it would be good to write how I do these calculations. Back to basic, below are the simple Electric Power formulas for Single Phase AC Circuit, Three Phase AC Circuits and DC Circuits. I have the same issue with our Contractor supplying pump motor 50hz, where-in our system here is 60 hz. When making adding a Note to our site we have a great online WYSIWYG editor and things are pretty simple. This figure is a constant found in three phase, as the phases do not generate the same amount of power (simultaneously). Businesses that require three-phase power need to add an extra component in the formula to arrive at the correct transformer size, i.e., square root of 3 (√3) or 1.732. The reader is encouraged to review AN109, References 3, 4, and 5 as background for this Application Note. Also make sure you use the larger voltage of the system voltages, ex) if For the cable size I'll refer you to our calculator as it depends very much on the type of cable and installation: http://myelectrical.com/tools/cable-sizing-calculator After looking at the cable size calculator, if you have any questions on using it (or questions on the breaker selection), you can ask in the questions section of the site: hi,i would like to ask if getting the current in any configuration (delta or star) is it always the power in kva to be used?.i always had some trouble in this.pls help. The total load draw should not be any higher than the rated motor load, assuming the motor is appropriately rated for the work to be performed. BC=651.85A, AC=651.84A, supply voltage 220 line to line. For example my current system has the following power draw: A-B 56,000 Watts B-C 23,000 Watts A-C 17,000 Watts It's hooked to a 3 phase wye system 208/120. 345/219 = 1.57 A per Phase = Line In Delta connection, phase sides are connected in a cyclical arrangement in order to make a closed loop as shown in figure 1. Thanks. Project management and team collaboration, with clear easy to read calculations and reports. Power (3-phase) = kW, therefore per phase = kW/3 These can be easily derived from the above, giving for example: The above deals with balanced three phase systems. When I try to remember formulae I always forget them soon or become unsure if I am remembering them correctly. This configuration of voltage sources is characterized by a common connection point joining one side of each source. Line to line voltage: W applied = 3 1/2 U ll I cos Φ = 3 1/2 U ll I PF (1) where. With single-phase AC power there is only one single sinusoidal voltage. Motor rated power is normally the output power, so to be fully accurate you need to consider the efficiency. If I have a system having Amperes on each phase as 80A, 70A, 82A and VLL is 400V and VLN is 210 V. Kindly share how to calculate its power consumption in KVA.
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