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The simple formula to calculate the rating of three phase Transformers is: KVA = (√3. V x I) /1000. Where: V is the voltage (volts) and I is the current (amps). Example: the following figure presents a nameplate of a three phase transformer. It's rating is 100 KVA. Using the aforementioned formula, let's confirm this rating: The Transformer Notes PDF and Study Materials presented above are aimed to assist the students at the time of exam preparations. They are reliable and have authoritative references focused on helping graduates and improving their knowledge and understanding of the subject during the time of preparation of the exam. Students can refer and practice from the provided notes for Transformer and important questions from this article. 3-Phase Current Formula. As we have seen, this 3-phase power formula calculates how many kW of electric power will a motor have given its current: P (kW) = (I (Amps) To figure out how many amps does a motor with certain kW power have, we have to rearrange this equation a bit. We get the 3-phase current formula like this: Using this power formula, we can, for example, do a 3-phase motor kW to amps calculation. Do note that if a 3-phase motor with lower voltage and lower power factor will draw In ∆ - Y connection of 3-phase transformers, the primary line voltage is equal to the primary phase voltage (V LP = V pP). The relationship between secondary voltages is V LS = V pS therefore, the line-line voltage ratio of this connection is (b) Figure: Delta - star connection of transformer (Phase shift 30 lead), (b) Phasor diagram calculator using the following formula: single phase transformer full load current (amp)= kVA × 1000/V Three phase transformer full load current (amp) = kVA × 1000 / (1.732 × V) where: kVA = Transformer rating (kV amp), V = Voltage (volt) turn rate = N1 /N2 = V1 / V2 = I2 / I1 by: N1 = Number of cycles