I should of checked the voltage. It is a conversion calculator which converts Kilovolts-amps (kVA) with the voltage in volts to amps (A). The transformer kVA rating can be used to calculate amps. If the three phases are reasonably balanced - list that current. Electrical calculators provides powerful automation tools to boost your productivity. Two-phase Amps = [HP * 746] / [E * %age Efficiency * PF * 2]. How to Convert kVA to Amps in Three-Phase Circuits. Leverage Watlow's growing toolkit of calculators, equations, reference data and more to help design your thermal system. As per my understanding & without other variables, this is the simple solution I could think of. In certain cases even more advanced options are … But opting out of some of these cookies may have an effect on your browsing experience. Transformer kVA to Amps Rating Calculator with Calculations and Examples [Single/Three Phase Transformer], Circuit Breaker Breaking Capacity Calculator, Digital Calculator [Binary – Octal – Decimal – Hexadecimal], 500 kVA Single Phase Transformer: I = 500 * 1000 / 3.3kV = 151.5 Amps, 500 kVA Three phase Transformer: I = 500 * 1000 / (3.3 * 1.73 kV) = 87.58 Amps, 1000 kVA Transformer Single Phase Amps when V = 33 kV: 30.30 A, 1000 kVA Transformer Single Phase Amps when V = 33 kV: 17.51 A. As per my understanding & without other variables, this is the simple solution I could think of. The formula is identical to the previous case with the difference of factor 1.73 instead of 2 in the denominator. The current is simply the kVA divided by the voltage. Given the kW and power factor the kVA can be easily worked out. It's … To get the current amps, you will begin by selecting the phase which can be either a single phase or a three phase. This website uses cookies to improve your experience while you navigate through the website. A 60A 3-phase branch circuit has 60A available on each leg. Electrical calculators is collection of tools, reference tables, formulas and electrical reference tables which helps you boost your productivity. Rang the electricity supplier and they said you can request for whatever (not quite her words) as long as you can provide justification for it. Three phase Amps =  [HP * 746] / [E * %age Efficiency * PF * 1.73]. Ampere (amps or amperage) is an SI unit of electric current and is denoted by 'A'. The relationship between kVA and kW is the power factor (pf):Single phase system - this is the easiest to deal with. We also use third-party cookies that help us analyze and understand how you use this website. Most AC power is produced and distributed as three-phase power with three sinusoidal voltages 120 degrees out of phase with each other.. GENERATOR AMP RATINGS - THREE PHASE EXTENDED: 3 PHASE AMPERES - 80% POWER FACTOR* (Extended Table) kW Times 1000 divided by (Volts*1.73) *.80. Starting & Running current are the three important factors for the rating of AC induction motor. AC three phase kilowatts to amps calculation Calculation with line to line voltage The phase current I in amps (A) is equal to 1000 times the power P in kilowatts (kW), divided by square root of 3 times the power factor PF times the line to line RMS voltage VL-L in volts (V): I(A) = 1000 × P(kW) / … Thus, the current in amps is equal to horsepower times 746 divided by the voltage times the efficiency η times the power factor. Current (I): Enter the the current in Amperes (A). For a normal, single-phase power supply at 240 volts, the maximum current would be 100 amps. How to Convert kVA to Amps in Three-Phase Circuits. Electrical calculators is collection of tools, reference tables, formulas and electrical reference tables which helps you boost your productivity. In DC circuits amps is the ratio between the product of HP * 746 to Voltage times efficiency. These cookies do not store any personal information. Any cookies that may not be particularly necessary for the website to function and is used specifically to collect user personal data via analytics, ads, other embedded contents are termed as non-necessary cookies. You can use the Electrical calculator to find the current in single, 2, and 3 phase motor circuits as well as in dc circuits. As an example, consider a loa… So you have 60A available on each leg for your loads. It is mandatory to procure user consent prior to running these cookies on your website. (in each of the three wires) If it was a heating load, cos phi is 1 so the answer would be 8 amps. But opting out of some of these cookies may have an effect on your browsing experience. The current in amps multiplied by voltage in volts gives power in watts (Power = voltage x current). Here’s a simple example of the equation: You’re preparing to drive a three phase low-horsepower motor rated at 10 amps. Jraef. I have a 65 amp machine but trying to get a machine that can go up to 130 amps but I control the amperage besides it will be a while and I need a place to get it up and runing and dialed in. For example, if A = 5.1A, B = 5.0A, C = 5.2A, you would say, "The current is 5.1A" That phrase means the currents are reasonably balanced and 5.1A is an average number. I got 9-.6-9 It sounds good. GENERATOR AMP RATINGS - THREE PHASE EXTENDED: 3 PHASE AMPERES - 80% POWER FACTOR* (Extended Table) kW Times 1000 divided by (Volts*1.73) *.80. It is mandatory to procure user consent prior to running these cookies on your website. If your calculator doesn’t have a square root function, use 1.73 as an approximation of the square root of 3. Out of these cookies, the cookies that are categorized as necessary are stored on your browser as they are essential for the working of basic functionalities of the website. Enter the kilovolts-amps followed by the volts in the same order. I got 9-.6-9 It sounds good. This website uses cookies to improve your experience. Perform a three-phase power calculation using the formula: P = √3 × pf × I × V Where pf is the power factor, I is the current, V is the voltage and P is the power. Still I will try to attempt this. FORMULAS USED IN CALCULATOR: 1-Phase KVA = Volts x Amps / 1000 1-Phase Amps = KVA / Volts x 1000 3-Phase KVA = Volts x Amps x 1.732 / 1000 3-Phase Amps = KVA / Volts / 1.732 x 1000 Use this online transformer capacity calculator to find its volts, kVA and amps 1 watt is defined as the energy consumption rate of one joule per second. My calculation was 11500/(1.732x400) = 16.6 Amps per phase ... 16.6 x 3 = 49.8 Amps, so i need a 50 Amp breaker. Amps per leg on three phase?? Here is a breakdown of your situation of the delta connected single phase loads. I will do that tomorrow. 3 phase "100 amps per phase" can someone explane "phases" to an idiot? These cookies will be stored in your browser only with your consent. Example: Determine the current flowing through a three-phase, 2 HP, 400-volt motor having an efficiency rating of 93% and a power factor of 0.9. If a three-phase supply is available, then the 24,000 watts are divided by … Enter the power factor of the load. Necessary cookies are absolutely essential for the website to function properly. This chart approximates the amperage of a generator based on the size of the generator and the load on the generator at 100 percent of capacity. The three-phase ac amps involve HP * 746 in the numerator and 1.73 times PF * Efficiency times voltages in the denominator. The power per phase is 1000 watts. If we divide 30 by 3 we get 10, the current in each phase of the three phase system. Back to the main topic: Neither of those terms have any meaning. Leverage Watlow's growing toolkit of calculators, equations, reference data and more to help design your thermal system. What is causing the .6 reading on one leg? After the steps above the final formula for converting horsepower to amps is: Amps = HP × 746 V × η × PF. Still I will try to attempt this. The single phase AC calculations involve the power factor in denomatior of equation. Three phase AC The three-phase ac amps involve HP * 746 in the numerator and 1.73 times PF * Efficiency times voltages in the denominator. Solution: Current = [1 * 746] / [120 * 0.88 * 0.9] = 7.84 Amps. Power factor (cosΦ). Example: Find the current passing through 24 volt, 1/2 HP motor having an efficiency of 95%. These cookies do not store any personal information. The formula to convert kVA to amps in a three-phase circuit looks like this: Current (A) = Power (kVA) × 1,000 √3 × Voltage (V) So, amps are equal to 1,000 times the power in kVA divided by the square root of 3 (1.732) times the voltage. Solution: Current = [0.5 * 746] / [220 * 0.88 * 0.9 * 2] = 1.07 Amps. It has two types, single phase and three phase transformer. Amps per leg on three phase?? A 3 phase transformer has three magnetic circuits that are interlaced to give a uniform distribution of the dielectric flux between the high and low volts windings. The product of the voltage and current is the apparent power and measured in VA (or kVA) . The formula to convert kVA to amps in a three-phase circuit looks like this: Current (A) = Power (kVA) × 1,000 √3 × Voltage (V) So, amps are equal to 1,000 times the power in kVA divided by the square root of 3 (1.732) times the voltage. I will do that tomorrow. The formula is identical to the previous case with the difference of factor 1.73 instead of 2 in the denominator. 3 phase motor current calculation formula is P/ (√3xVxPfxEff) or P/ (1.732xVxPfxEff) Both are the same. As a "rules of thumb" amps horsepower rating can be estimated to. The builder has said to request for 3 phase 40amps per phase. So in summary, when each single phase 208V load is drawing 34.64A, the 3-phase … Calculate Required UPS Size Phase Required 1 3 Volts Required. User manuals, specification sheets, CAD drawings and more. Out of these cookies, the cookies that are categorized as necessary are stored on your browser as they are essential for the working of basic functionalities of the website. The resulting value is the amount of power, expressed in amps, required at the input side of phase converter. In the case of single-phase: I = 225 * 1000 / 3.3kV = 68.18 Amps. The solution is to calculate the VA = E x I transposed to I = VA / E to get total amps. We'll assume you're ok with this, but you can opt-out if you wish. quantity 1 3 phase 80 amp breaker quantity 8 3 phase 60 amp breaker quantity 6 3 phase 30 amp breaker all these loads are continuous duty as they run machines that never shut down and if i calculate for worse case scenario i would add all the breakers and multiply by .80 coming up with 592 amps. If we had a single phase system, that 3000 watts would be drawing 30 amps, as 30 amps times 100vrms is 3000 watts (resistive). Single & Three Phase Line kVA calculator is an online tool used in electrical engineering to measure the unknown quantity by two known quantities applied to the below formulas for single phase and three phase connection. Three-phase Transformer Amps = Transformer kVA rating * 1000 / (E*1.73) Examples for Transformer Amps calculations 225 kVA, 3.3 kV Transformer amps. So our motor power is 15KW with 15 x 1000 = 15000 Watts. This chart approximates the amperage of a generator based on the size of the generator and the load on the generator at 100 percent of capacity.