Sizing a generator for three phase motor starting lra. Figure 1 amps measured amps full load, nameplate volts measured volts nameplate x motor load estimation techniques kilowatt ratio technique motor load voltage compensated slip technique motor load kw input or volts avg x amps avg x power factor 100 x v 3. For example, power distribution companies deliver power in the form of kilovoltsamperes or kva. Softstart draws 400600% of rated amps during motor start a vfd draws only 100% to 120% of rated amps at 100% rated torque source. Enter the known kw and system voltages to find the current through the circuit.
Amps when hp is known hp x 746 v x %eff x pf hp x 746 v x %eff x pf x 2 hp x 746 v x %eff x pf x 1. Motor efficiency and power factor university of alabama. For threewire, two phase circuits, the current in the common conductor is 1. The relation between total power, reactive power and real power is shown in the power triangle. The current i in amps a is equal to times the power p in kilowatts kw, divided by the voltage v in volts v. It appears you dont have a pdf plugin for this browser. Use the chart in this calculation guide to find the formula you need according to. The nameplate fla is used to select the correct wire size, motor starter, and overload protection. Hp to kw calculator, examples, steps to convert, table and.
You can then enter the power factor which should range from 0 to 1. Power factor vs amps volts amps va kw power factor var amps reactive amps resistive 208 83 0 10 1 0 0 83 208 88 10526 10 0. Four pole motor will have half the frequency, sixpole motor will have a third of the frequency. Convert amps to kw kilowatts calculator top online tool. Similar converter kw to amps and kwh to ah convert amps to kilowatts.
The nameplate fla is used to select the correct wire size, motor starter, and overload protection devices necessary to serve and protect the motor. How to convert kw to amps in 3 phase system youtube. In case you want to perform other conversions, you can remove the text fields using the reset button. Hundreds of electrical products and tools to select from. Continue reading to see how this formula was derived. Two pole motor has the same mechanical frequency as the excitation voltage. Sizing a generator for a specific electric motor load, or for. P kw v v ac single phase kilowatts to amps calculation. Scan the row to the left and find the kva and kw rating needed. Motors of higher speed usually take a lower current than that shown in the table. A 920kv motor with a 10x5 prop makes 48 oz thrust at 21 amps which is 2. Hp to kw calculator, examples, steps to convert, table.
Understanding motor nameplate information nema vs iec. Use the chart in this calculation guide to find the formula you need according to the measure you will calculate. Given that the power consumption by an electrical appliance is 0. Horsepower hp is a measure of electric power equal to 746 watts w. If you have a direct current with 10 kw and 6 v, then your current result in amps will be 1666. Aug 05, 2014 how to convert kilowatt to amps in three phase electric system change kilo watts to amps kw watts. Franklin electric submersible motors are a waterlubricated design.
Capacity amps side side in amps main delta star 3 2. Understanding power factor and how it affects your. If the current type was ac single phase, you can enter 100 amps and 80 volts in the required cells. Understanding power factor and how it affects your electric bill. Exponent failure analysis associates reduced voltage starter %v or %i %fla %flt 100 660 150 90 595 122 82 540 100 70 460 74 58 380 50 25 soft starting.
It can be threephase, then a multiplier is equal to sqrt 3. For a single phase ac circuit the formula to convert kilowatts kw to amps is. Enter horsepower, volts, and motor efficiency below to convert to amps. As a rules of thumb amps horsepower rating can be estimated to. Wire size chart single phase wire size chart three phase motor rating cicuit size fuse size full load amps copper wire size volts hp kw 12 10 8 6 4 2 0 00 000 0000 250 300 350 400 500 600 120 1o 14 20 10 5. The running amperage under those conditions was found to be 16 amps. Multiply the motor voltage by the fullload current. Sizing a generator for a specific electric motor load, or. If a motor gives two voltages such as 230460v, it will give two corresponding fullload currents such as 2010 amps. An existing motor is identified as a 40hp, 1800 rpm unit with an open dripproof enclosure.
Converting horsepower to amps can be done in a few simple steps, or using this simple formula. Always check nameplate information before designing protective devices, wiring and switch gear. Kilowatts kw to amps electrical conversion calculator. Motor full load amperes basic fan laws variation fan speed change density change. Power factor pf represents some efficiency ratio, e. Power in kilowatts or kw is the relationship between current and voltage as measured at an electrical load. Hp to amps calculator is used to calculate the amperes from horsepower of the motor is known. All wiring should be performed by a licensed electrician or electrical contractor and must meet all applicable codes for the area where. For example, if you have 100 amps and 80 volt with a direct current, then your power result in kilowatts will be 8 kw. This amperage is for the original conditions with a motor pulley of 8, a blower rpm of 875, and the 3000 cfm airflow rate. When working with the calculations of the conversions you have to make sure that the set of. The power p in kilowatts kw is equal to the power factor pf times the phase current i in amps a, times the rms voltage v in.
The current s listed shall be permitted for system volt age ranges of 1 10120, 220240, 440480, and 550600 volt s. Hp to amps conversion calculator 3 phase, single, two. Work out the power consumption in an electrical circuit where the voltage supply is 110v and the current is 2a. How to figure kw rating of a 3 phase electric motor. The fill solution consists of a mixture of deionized water and propylene glycol a nontoxic antifreeze. Scan down this column to the current needed for your application select the next higher current rating for more margin. To convert watts to amps use our watts to amps conversion. Power p current i voltage v 800 amps at 1 volt is 800 watts or 0. The voltages listed are st andard rated motor volt ages. Motor full load amperes basic fan laws variation fan speed change density change volume.
Select the current type either the single or three phase according to the units to be converted. Phase ph can be single, then a multiplier is equal to one. Either pair of numbers will give the correct power consumption, in this case 4. Kilowatts are calculated by multiplying the volts by amps and then dividing by 1,000. Understanding motor nameplate information nema vs iec standards course content. Understanding electric motor energy efficiency regulations weg canada typical motor fla ratings the basics of pf correction on single induction motors electrical simple guide to choosing generator motor size. Useable if load is mostly resistive load kva kw 5hp motor 5. To convert watts to amps use our watts to amps conversion calculator. Motor full load amps are taken from motors currently used by champion.
Desired data singlephase threephase direct current kilovoltamps kva volts x amps 1,000. Hp 3 phase kw approx phase star delta relay typical 415 v 415 v full current starter scale back up 50 hz 50 hz load current in amps. By example, you have an electric motor of 40hp, with an efficiency of 88. The power p in kilowatts kw is equal to the current i in amps a, times the voltage v in volts v divided by. In dc circuits amps is the ratio between the product of hp 746 to voltage times efficiency. Generator current ratings three phase ac generator current ratings based on kilowatt output at 120, 208, 240, 277, and 480 volts three phase ac with a powerfactor of. Electrical formulae for calculating amps, horsepower. How to convert electric current in amps a to electric power in kilowatts kw dc amps to kilowatts conversion. Kw is also referred to as applied power or absorbed power because its the power actually used by the load. The same situation is for kilovoltamperes, where 1. Amps when kw is known kw x v x pf kw x v x pf x 2 kw x v x pf x 1. Fan motor hp cfm x pressure lbssq ft33000 x eff pump motor hp.
The wire, breaker and fuse sizes are provided as a reference for the installer and are based on the 1996 national electrical code. A 50 kw, 100volt dc direct current generator power v belt. The phase current i in amps a is equal to times the power p in kilowatts kw, divided by the power factor pf times the rms voltage v in volts v. For example, if you have a refrigerator that consumes 1. You can use the electrical calculator to find the current in single, 2, and 3 phase motor circuits as well as in dc circuits. The mechanical speed can be further reduced by using a motor with higher magnetic pole count. The tables are based on motors of approximately 1450rpm of average efficiency and power factor.