Enter the power factor of the load. The current in amps multiplied by voltage in volts gives power in watts (Power = voltage x current). 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. Then compute I per (conductor or leg) using the rule that on a three phase system current on an individual conductor is 1/ (3^0.5) = 1/1.73 of the total current. Given the kW and power factor the kVA can be easily worked out. 1 watt is defined as the energy consumption rate of one joule per second. Back to the main topic: If you have say a 6kW load motor), that's 2kW per phase, divide by 240 equals about 8 amps, divide by your power factor (cos phi) [say 0.8] equals 10 amps. HP to Amps Conversion Calculator [3 Phase, Single, Two Phase, DC] | Horsepower to Amperes, Circuit Breaker Breaking Capacity Calculator, Digital Calculator [Binary – Octal – Decimal – Hexadecimal]. Solution: Current = [0.5 * 746] / [24 volt * 0.95] = 16.35 Amps. Ideally I'd need 150 amps but 100 amps would be OK. 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. Decided to check the amps on a three hp motor. The formula is identical to the previous case with the difference of factor 1.73 instead of 2 in the denominator. The two phase calculations are similar to 1 phase with an additional factor 2 in the denominators. Two-phase Amps = [HP * 746] / [E * %age Efficiency * PF * 2]. These cookies will be stored in your browser only with your consent. Three-phase Transformer Amps = Transformer kVA rating * 1000 / (E*1.73) Examples for Transformer Amps calculations 225 kVA, 3.3 kV Transformer amps. 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. The diagram and table below can be used to convert amperage between single phase and three phase equipment and vice versa. 02-24-2017, 07:36 PM #2. You also have the option to opt-out of these cookies. The rms current per phase is 100/10=10 amps. For three phase circuits the power factor is the square root of 3. To get the current amps, you will begin by selecting the phase which can be either a single phase or a three phase. Use this online transformer capacity calculator to find its volts, kVA and amps 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. Starting & Running current are the three important factors for the rating of AC induction motor. What is causing the .6 reading on one leg? Still I will try to attempt this. If i have a power of 11.5 kW and voltage of 400V, what size circuit breaker is needed for three-phase system. The product of the voltage and current is the apparent power and measured in VA (or kVA) . I should of checked the voltage. But opting out of some of these cookies may have an effect on your browsing experience. Necessary cookies are absolutely essential for the website to function properly. We'll assume you're ok with this, but you can opt-out if you wish. How to Convert kVA to Amps in Three-Phase Circuits. GENERATOR AMP RATINGS - THREE PHASE EXTENDED: 3 PHASE AMPERES - 80% POWER FACTOR* (Extended Table) kW Times 1000 divided by (Volts*1.73) *.80. Ampere (amps or amperage) is an SI unit of electric current and is denoted by 'A'. To calculate kVA, you need to enter the known values of voltage and the current into the respective fields. 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. Necessary cookies are absolutely essential for the website to function properly. Calculation of AC Single phase Kilowatts to amps I (A) = 1000 x P (kW) / (PF x V (V)), which means that the phase current in amps is calculated by multiplying 1000 by the power in Kilowatts dividing the result by the power factor multiplied by the RMS voltage in volts. DC Amps = [HP * 746] / [E * %age Efficiency]. So our motor power is 15KW with 15 x 1000 = 15000 Watts. Thus, the current in amps is equal to horsepower times 746 divided by the voltage times the efficiency η times the power factor. The transformer kVA rating can be used to calculate amps. Find the amperage rating of a transformer having 225 kVA and 500 V in case of single and three phase. As per my understanding & without other variables, this is the simple solution I could think of. 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. 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. This category only includes cookies that ensures basic functionalities and security features of the website. HP to Amps calculator is used to calculate the amperes from horsepower of the motor is known. In the case of single-phase: I = 225 * 1000 / 3.3kV = 68.18 Amps. Decided to check the amps on a three hp motor. 1 Ampere is defined as the electrical current that flows with electric charge of one Coulomb per second. For example, a three phase circuit using 25,000 watts of power and a line voltage of 250 will have a current flow of 25,000/(250 x 1.73), which is equal to 57.80 amperes. 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. This website uses cookies to improve your experience. You also have the option to opt-out of these cookies. The three-phase power calculator calculates the apparent, active and reactive power for three-phase AC systems. But opting out of some of these cookies may have an effect on your browsing experience. As per my understanding & without other variables, this is the simple solution I could think of. Example: Determine the current flowing through a two-phase, 0.5 HP, 220 volt motor having an efficiency rating of 90% and a power factor of 0.92. This category only includes cookies that ensures basic functionalities and security features of the website. Amps to Watts Calculator. In a single-phase AC power system there is only one single sinusoidal voltage. If the three phases are reasonably balanced - list that current. 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. This website uses cookies to improve your experience. Electrical calculators provides powerful automation tools to boost your productivity. It is mandatory to procure user consent prior to running these cookies on your website. For a normal, single-phase power supply at 240 volts, the maximum current would be 100 amps. Typically, two options are offered: permanent magnet or auxiliary winding. The three-phase ac amps involve HP * 746 in the numerator and 1.73 times PF * Efficiency times voltages in the denominator. I got 9-.6-9 It sounds good. 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. Do not say "Amps per phase", or "Amps per leg". We'll assume you're ok with this, but you can opt-out if you wish. This video is about 3 phase motor amps calculation Or 3 phase motor current calculation guide. Power Factor 0.8 0.9 0.95 Generator Power (kW) = Generator Power (kVA) 75% Continuous Load (kVA) Converting kW to HP kW = HP. The power taken by a circuit (single or three phase) is measured in watts W (or kW). So you have 60A available on each leg for your loads. Calculate Required UPS Size Phase Required 1 3 Volts Required. Leverage Watlow's growing toolkit of calculators, equations, reference data and more to help design your thermal system. 02-24-2017, 07:36 PM #2. 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. After the steps above the final formula for converting horsepower to amps is: Amps = HP × 746 V × η × PF. It is mandatory to procure user consent prior to running these cookies on your website. This website uses cookies to improve your experience while you navigate through the website. 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. For three phase circuits the power factor is the square root of 3. Still I will try to attempt this. AC three phase watts to amps calculation Calculation with line to line voltage. Motor volts are 380 volts, Eff is 0.89 and PF is 0.85 according to the above nameplate.
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