100W, 400W + Calculator, SCFM Vs CFM Explained: With SCFM To CFM Calculator (+ Chart). Think of it as miles on your cars dashboard. Thanks. And the value of the impedance and the reactance if required. now simply follow the above single phase method. Thanks. Save my name, email, and website in this browser for the next time I comment. The rpm does not affect it.
5 Dripping Split AC Causes, Should You Cover Your Air Conditioner In The Winter? The calculation of current in a three phase system has been brought up on our site feedback and is a discussion I seem to get involved in every now and again. 20F? I try not to think like that as it confuses me as well and there is sometimes more to it than that. These can be easily derived from the above, giving for example: The above deals with balanced three phase systems. Right bottom corner part is to indicate the unit of the electric parameter. You could do the calculation in terms of peak current if you wanted (for a sine wave the relationship between the peak and RMS is the square root of two). Once you have your meter reading, you can calculate how much electricity youve used since your last electricity bill. Amp Hour Calculator: How To Calculate Amp Hours Of A Battery?
Note: Later on, we will also see how we can use the 3-phase current formula to design a 3-phase motor amps calculator. We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites. I don't see any problem in connecting the single phase motor to line/neutral. 
I guess in a simple way, complex power is understanding the the real and reactive components are 90 out of phase. As an example, consider a balanced three phase load consuming 36 kW at a power factor of 0.86 and line to line voltage of 400 V (VLL) : the line to neutral (phase) voltage VLN = 400/3 = 230 V
Any help greatly appreciated! If the dial is between two numbers, use the number that has just been passed. So it is the second part of your reply that I don't understand. When current flows within a wire, a magnetic field is created. Your meter will be one of three types: Before we show you how to calculate your energy usage, lets first take a look at how to get the reading from each type of meter. Robert, I make the line current as 33.6 A. That definitely clarifies the error in my calcs. (40 lb To Gallons), Cost To Refill 20 lb Propane Tank (Refill Cost Calculator + Chart), 9 Absolute Best Air Purifiers For Dust Removal In 2022, How To Tell If Propane Tank Is Empty? Bi-directional meters are used to calculate both export and import of the energy. HSPF5 Vs HSPF4: Why 2 Heat Pump Efficiencies On Specs Sheets? Sir, when a voltage dip occurs current increases, so instead of dimming, a bulb should glow brighter but the reverse thing happens, why?
Every appliance and electronic device in your home adds to your bill. Sorry if this is a simple question. I hope to get some answers and if any reference on web would be great. can i connect single phase motors to line-neutral?like air compressor & pump motor? The three phase current as you are trying to calculate it does not exist. That 60A is total rms current for a single phase, not the peak current, correct? When I try to remember formulae I always forget them soon or become unsure if I am remembering them correctly. 4 Smallest Air Purifiers For Small Rooms (Below 200 Sq Ft). I like to use kVA as this is just the voltage multiplied by the current. Displays are categorized in a different page. Thanks. We have a lot of loads that are connected line-neutral and figuring out those loads is easy. thank you very much. In a 3-phase AC circuit (usually a 3-phase motor), converting amps to kW and kW to amps is not all that easy. I have now changed it to show kVA. You need to be cognisant of what you are supplying and if this will affect the sizing (for example if the load is non-linear). Visitors who like to type web address rather then click menus may be interested in how our URL structure works. So (I) would be equal to 72.79A is this 72.79 divided by the 3 phase, i.e does each phase has a load of 24.26 A ? Usually your bill will have a cost per unit, which will come in handy when we break down the equation for you later on. Need your excellent advise Mr. Steven. The figure (Fig. Youre probably wondering the meaning behind these numbers. I = 249/(1.73*0.72*380) = 0.52 A The motor would be running faster due to the frequency. Why Is AC Spitting Water Inside And Making Noise? For a digital meter, you only need to make a note of the first five numbers being shown. = kW / (3 x pf) As a general guide I would just add up the VA, use a 70% load factor. V Line-Line = 380 V Dear Steven - I am a student and I've been struggling to understand something: if we have a balanced STAR connection with a certain apparent power consumption (VA), will this power change if we switch the connection to DELTA? Not directly related to the post, but this is a great question. By calculating your own tab, you can find out which appliances are costing you much more than they should. Thanks Steven!
There are approximately 300 displays are there in the secure meter. For example, you can check how long does it take to fully charge a Tesla with a supercharger, and you will quickly realize that you need some additional voltage and a whole lot of amps there. To know more about single phase bidirectional meter, click here. I line = 0.90 * 1.73 = 1.57 A Cheers, Nathan. Digital and smart meters are much more straightforward and easier to use. dilan, the kVA would be ( 642.24 + 651.85 + 651.84) * 220 = 428102 VA = 428.1 kVA the kW would be 428.1 x 0.86 = 368.2 kW For the breaker, I would likely be looking at 800 A (posibly something like a MasterPact NT or NW, depending on other parameters) and setting the overload protection in the range of 710 A (this is plus 10%). Introduction to Three Phase Electric Power, Cables for MV Power Distribution - Earthed versus Unearthed Systems, Differential protection, the good old days, Photovoltaic (PV) - Utility Power Grid Interface, Click here to view the notes listin a table format, Click here to view the notes indexed by tag, have a question or need help, please use our, spotted an error or have additional info that you think should be in this post, feel free to. (4 Hoseless Methods), How Cold Should An Air Conditioner Blow? Here we are listing common materials along with Lamps are the essential part of any luminaire. Hope this makes sense. I just don't know how to go about it. If you are looking at it on a phase by phase you may need to be a little careful. In households, meters could be either single phase or three phase. If the voltages become unbalanced or there are other considerations (i.e. Youll then take this number and multiply it by the kWh rate your power company charges and add any fixed fees. The potion of this magnetic field perpendicular to the wire is called the magnetic flux Often document control is dictated by project requirements, for example a particular organisation may have an existing numbering system. Similarly a transformer (with three windings, each identical) supplying a given kVA will have each winding supplying a third of the total power. One kWh is equal to one unit. For Example :- Each phase of 3 phase machine takes a load of 16 amps, So how do I calculate how many KVA generator is required ? Calculating it on your own will put a stop to your over-inflated bill. At the next Press, Displays shows the current date in the meter in DD: MM: YY format. If you know the kVA and voltage, it is very easy to work out the current. When calculating the current use the phase voltage which is related to the line voltage by the square root of three. single phase bidirectional meter, click here, KERC Revises Electricity bills For FY2021-22, Financial Viability Check: Rooftop Solar for Apartments in Bangalore. Meters read your electricity in kilowatt-hours (kWh). I have a small 400 V three phase 4 wire (star) installation with the following resistive loads on each; I need to calculate the line current in each of the three phases can some one please help with a formula? 3 Tell-Tale Signs (Ice On Evaporator Coils), Can You Put A Window Air Conditioner In Sideways? Regards Abdulla. That requires only the basic Ohms law; you can simply use our kW to amps calculator here for conversion. or need modification on the motor. At What Temperature Does A Heat Pump Stop Working? (Out Of Vents Temperature), How Much Does It Cost To Run A Mini Split? Thank you so much! And now I would like to know how does the calculation works when a generator has to be used? The key to doing this is that the sum of power in each phase is equal to the total power of the system. The relationship between kVA and kW is the power factor (pf): Single phase system - this is the easiest to deal with. I do have my 'Motor Starting - Star Delta' post drafted which explains this in more detail. 572.1A). How to use the formula and which formula to find it out..??? ow many amps in 3-phase power? three phase power is 36 kW, single phase power = 36/3 = 12 kW I just went through and got a few strange results, and realised that earlier you state VLL = 3 x VLN Hence I wondered why you would then multiply VLL again by 3. so that i can assign suitable cable and breaker? Balanced three phase system with total power P (W), power factor pf and line to line voltage VLL, Convert to single phase problem: Heres how many amps does it draw: To see why we get different amperage on a 3-phase circuit, lets first check how these amps are calculated using the 3-phase power formula: Heres the simple formula we use to calculate power on a 1-phase AC circuit: Basically, we just multiply amp by volts. Quite similarly, a higher power factor is proportional to higher power output. (std. 4 Coil Defrost Options (Ice Thawing), How To Tell If AC Is Frozen? Total VA = 50.46, using 70% require 72 VA transformer (chose next standard size up). About the author, Hi All, This awareness can both lower your bill and reduce your carbon footprint at the same time. 345/380 = 0.90 I Phase He has a deep technical understanding of electrical engineering and is keen to share this knowledge. Also be aware that if draw more power, you equipment may not have been designed for it. In a three phase system we have the line to line voltage (VLL) and the phase voltage (VLN), related by: or alternatively as: tan=Q/P, Hi all, i have problem in total current computation from ;three phase and single phase, the system is 380v 3-phase, line to neutral is 220. i computed the current from line to neutral AN=80.6, BN= 65.8, CN=73.2a three phase current is 491.5a. Hello Chris, thanks, we hope anybody understands how to play around with these equations. Often where single phase loads are involved, residential and commercial premises for example, the system can be unbalanced with each phase have a different current and delivering or consuming a differing amount of power. The power factor is the ratio of the real work to the apparent power. Hi there, thanks for the heads up. 249/0.72 = 345 VA per phase I am calculating the current in a 3 phase 380 V balanced Y system with a single motor load of 746 watts with a power factor of 0.72 and am getting different results when using the approaches suggested above. You can insert these numbers into the calculator and see if you get the correct result. which is your total active import energy. 345/219 = 1.57 A per Phase = Line I'm not sure of where you are getting your 491.5A from. At 1.0 power factor, the amps in 3-phase power in this situation is 28.87 amps.
All in all, we hope these calculators help you determine the power and current specifications of electric motors. But a different result when using 1 kW = 1,000W. Once youve obtained that information and the total amount of kWh used since your last meter reading, youll be ready to proceed. should i combine/sum phase A, phase B, Phase C and 491.5A. Current = W / voltage = 13900/230 = 60 A. System voltages and currents can be found by drawing out the circuit in full detail and using Kirchhoff's laws and other network theorems. 380/1.73 = 219 V Line-Neutral (Phase Voltage) As we can see, the electrical power in the 3-phase AC circuit depends on: Because we need to use the power factor to calculate the kW from amps, this formula is also known as the 3-phase power factor formula.
The following note touches briefly on the topic of complex power: That is the current in each phase is the same and each phase delivers or consumes the same amount of power.
If youre conscious about your carbon footprint, you shouldnt be paying a high energy bill. VA is simply the current times the voltage, so knowing this and the voltage can give the current. On the Star Delta. In the post, the motor is a three phase load, where as the socket is single phase - in each case case you have the line current which is common (for example, the current flowing in L1). Please can some body teach me, what is the current across each line of a 167 kVA 3 phase generator with a line voltage of 240 volt, It is a three phase generator, each phase supplies 167/3 = 56 kVA. As an Amazon Associate we earn from qualifying purchases. How to read a 3 Phase Bi-Directional Meter? My advice would be to always try remember the method and not simply memorize formula. Hopefully it may prove useful to someone else. Such a motor has a 300.70 amp draw. The number you see on your meter represents the kilowatt hours that have been used since the meter was first installed. These are the light generating components. Total savings for this customer by exporting solar energy to the grid is = 381.7 360.2 = 21.5 unit. Thanks for the write up. The phase voltage is 400/ (3) = 230 V. To convert kW to kVA you need the power factor (you could just use kW, but you would have some error). ABB that according to their calculation, that 50hz motor would be fine for 60hz system. The calculator will dynamically calculate the current (amps) based on your inputs: You can use this example to check if youre correctly using the 3-phase current calculator: Lets say we have a 200 kW motor on a 480V 3-phase circuit with a 0.8 power factor. Is this wrong? So is it as simple as multiply by 3 to get the total, 3-phase rms current? A-N, B-N and C-N). To make the situation confusing, the contractor got the confirmation from the manufacturere. Also, if this was a Delta configuration, then the line current would be The kW per winding (single phase) has to be the total divided by 3. If the 491.5A is an existing or additional loads to the 80.6A, you would need to add to get the total current (i.e. If you create a fault the current will increase (you have reduced the circuit impedance with the fault). kVA = kW / power factor = 12/0.86 = 13.9 kW (13900 W) A-B 56,000/208 = 269 A in that branch). Air Handler Leaking Water On Floor? I= S 1ph V LN = P 3pf 3 V LL, Simplifying (and with 3 = 3 x 3): Take a three phase motor (with three windings, each identical) consuming a given kW. The 1,000 factor is there to convert from W to kW; we want the resulting power to be in kilowatts. kVA per phase = kW per phase / power factor Air Purifier Room Size Calculator: What Size Air Purifier Do You Need? Convert kVA To kW With Power Factor (+ Easy Calculator). Knowing that efficiency of power consuming equipment is the output power divided by the input power, again this can easily accounted.for Reactive power is not discussed in the article and more details can be found in other notes (just use the site search). I have the same issue with our Contractor supplying pump motor 50hz, where-in our system here is 60 hz. To me the easiest way to solve three phase problems is to convert them to a single phase problem. thank you very much for the reply, but how to calculate the total ampere of the system, if A phase 80.6A, B phase 65.8A, C phase 73.2A. Your meter reading will never reset to zero. If for some reason you see a set of numbers that starts 0.1 after the first five numbers on your meter ignore them. Photovoltaic (PV) systems are typically more efficient when connected in parallel with a main power gird. to better understand this or gain more insight, you can read the Introduction to Three Phase Electric Power post. For the red phase, assuming a power factor of 0.95, the kVA is 20 kW / 0.95 = 21 kVA. Hello everybody, I would appreciate if you can help me with this problem I have: What is the current of an 647kW, 577V three-phase load with cosFI=0.91? I know this probably is easy to understand, but I got myself to a completely confused state. By remembering that a three phase power (kW or kVA) is simply three times the single phase power, any three phase problem can be simplified. I= P 3 pf V LL. The power taken by a circuit (single or three phase) is measured in watts W (or kW). (Serial Number), Carrier HVAC Age: How To Tell AC Or Furnace Age? my question is do i need to multiply 80.6a to 1.732 to convert in 3 phase? If youve ever received a high energy bill, it might be time to learn how to read your meter, so that you can begin saving. If you do a site search for "International Voltages" we have a Wiki page which lists some of these (may be slightly out of date). Pip, sorry for the delay busy relocating countries/jobs at the moment. Am I correct? BC=651.85A, AC=651.84A, supply voltage 220 line to line. I have 3 loads on each phase as L1-2=19.74 VA, L2-3=16.91 VA L1-3=13.81 VA Please tell the capacity of the transformer required. The equation listed above will help you track your energy consumption. Quadrant 1st and 4th are visible at this stage. If you interested in an introduction you can view our post: Network Theory Introduction and Review. More traditionally formulas may be used to give the same result. To calculate your bill, youll also need to know how much your utility company charges per one kilowatt hour and if there are any fixed fees included in your bill. Now for the 3-phase motor current calculation formula: As we have seen, this 3-phase power formula calculates how many kW of electric power will a motor have given its current: To figure out how many amps does a motor with certain kW power have, we have to rearrange this equation a bit. If it is star connected than the phase voltage is 240/sqrt(3) = 138 V and the current is 56,000/138 = 400 A. I pretty sure the formula given is correct. (Dos/Donts), Convert HSPF To COP: Calculating COP From HSPF Rating (Heat Pumps). tian, There is always more than one way to do things. When you are pressing each time, the four-quadrant circle will be in the invisible state. Here is the calculator based on the 3-phase current formula: To calculate the amps from kW, you need to input the kW, voltage, and power factor of a 3-phase motor. air), Sensible Heat (BTU/hr) = 1.1 x CFM x t (std. In general when connecting in delta you have a higher voltage on each leg, so I would say you consume more power.
We use a 3-phase circuit for heavy-duty tasks. Ignoring efficiency and assuming single phase 230 V, the VA would be 184 (230 V x 0.8 A) and power factor 110/184 = 0.6. If the dial is directly over a number, read that number only if the dial to its right has passed zero.
80x210 = 1680 VA). Next and the following press will indicate Present Voltage, Current status and Phase sequence and Current sequence (Always have a look on the top bottom corner to understand the unit). What Temperature To Set Air Conditioner In Summer: 72, 75, 78F? Voltage rage should be exceed up to 400 V. To calculate for high volt motors. (Central, Mini Split). To find the power given current, multiply by the voltage and then the power factor to convert to W. For a three phase system multiply by three to get the total power. To simplify the whole thing, we have created 2 three-phase power calculators: To get an idea of how these calculators work, here is the screenshot of the 3-phase power calculator: Before we cover the basics, lets do a quick example to illustrate how calculating power on a 1-phase vs 3-phase circuit works. Once you know the kVA, you can calculate the power factor form pf=kW/kVA. Within the body of the post I have added an example of how to derive the formulae. On the right top corner of the LCD display, there is a circle divided equally into four parts (Basically, four quadrant) and consists of a different symbol. It happens, and it can be frustrating. Similarly given the power in each phase you could easily find the phase currents. At the fault location, because the phases are shorted, they will be at nearly the same voltage (close to zero depending on the impedance). Thanks Steven, it helps a lot. Toget started and understand our policy, you can read our How to Write an Electrical Note. In this case total export energy is 381.7 unit (First Image).
In a single phase system you would only have one winding, giving you a single phase (live and neutral). Does Power Factors plays any role? Which brings up another question. (Carrier Serial Number), 3 Easy Ways How To Tell If Ceiling Fan Capacitor Is Bad (Symptoms), How Many Gallons Are In A 40 lb Propane Tank? Motor rated power is normally the output power, so to be fully accurate you need to consider the efficiency. Power (3-phase) = kW, therefore per phase = kW/3 This is done all the time (fridge or toilet extract fan in your house for example). By writing an electrical note, you will be educating ourusersandat the same time promoting your expertisewithin the engineering community. Consider the motor as a black box taking some power. You can't divide the current by three (power kW or kVA - yes). Similarly for phase B (1/2AB + 1/2BC) and phase C (1/2BC + 1/2AC). now follow the above single phase method Hope this makes some sense. With A-B, B-C and A-C you are looking a loads in a delta connected system. Total three phase power = 18.4 + 16.1 + 18.86 = 53.36 kVA. Steven, let me give you a few more details. Using these rules it is possible to work out any three phase problem without the need to remember and/or resort to formulas. Can we use in Asia (380 volt 50 Hz)?
Where I have issues is when we have loads connected across two phases. (Calc + Chart), How Many Watts Do 1,2,3,4,5,6 Ton ACs Use? The calculator is now expanded to 480V to accommodate for high volt motor calculations. When youre dealing with a dial meter, youll usually see five different dials.
The same definition holds for both three phase and single phase systems. Assuming delta connected, the line voltage is across each phase and the current is 56,000/240 = 230 A. P 1ph = P 3, Single phase apparent power S1ph (VA): This is wrong calaculation. If you have some expert knowledge or experience, why not consider sharing this with our community. In this case (First Image) total import energy is 360.9 unit. kindly correct my computation: I=1.732(80.6)+491.5A I=631.09. = (kW x 3) / (3 x pf x VLL) Kindly I want to know in 3 phase distribution ( example a house), Say I have 29 kVA equals to 36,250watts (PF=0.8). I believe that as you lower the voltage across the lamp, the current would reduce and the brightness (think of the lamp as a resistance). How Cool Should My House Be If Its 90F Outside (Or More)? To convert a three phase problem to a single phase problem take the total kW (or kVA) and divide by three. Would it be possible for you to ask this in our question section.
To me it is easier, and if necessary I can always derive the formulae. In this situation and with a little thought it is possible to extend the above type of calculation to unbalanced current three phase systems.
Hi Steven, I drive a centrifugal water pump with a three phase motor. Press the Scroll Push Button, a Different value of the parameter will be displayed in the LCD display. Phase A - 1/2 56,000 + 1/2 17,00 = 36,500 W - divide by 120 V gives 304 A in the line conductor - similar for the other phases, giving B=329 A and C=167 A I have assumed the power factor =1 and W = VA. As a practical matter when literature specifies "line" voltage does this correspond to the country standard; ie 480 VAC 3 phase industrial power in the US? Also depends on if it is three phase or single phase and the voltage. To do so, first find your last months electricity bill to see the reported reading. Thank you so much I have learned a lot and get more clarity on how to play around with the formulas. thanks.. You don't need to combine the current - just take the worse case line current for sizing cables/breakers. You can use this example to see how the 3-phase power calculator works: A 100 amps motor on a 240V 3-phase circuit with a 0.9 power factor produces 37.41 kW of electrical power. To avoid any misunderstanding, the following post may also help you: http://myelectrical.com/notes/entryid/172/three-phase-power-simplified. Hi Steven, how to get the total KVA of the system if Line AB =642.24amp. This indicates the type of energy being displayed which can be basic import or export, inductor and capacitor for reactive lag and reactive lead respectively. I have electric motor from USA, 3 phase 230 Volt 60 Hz. What normally happens in star is that because the voltage is less across each winding, you end up delivering less power then you would in delta (less power is less current). 208/120 is the voltage for a delta (208) / star (120), connected system. (Unfreezing), How To Unfreeze AC Unit Fast? If you also know the power factor you can convert between kVA and kW as shown earlier. For example, take a 400 V (VLL) three phase system with the following loads: phase 1 = 80 A, phase 2 = 70 A, phase 3 = 82 A, the line to neutral (phase) voltage VLN = 400/3 = 230 V What happens when you're late on your electric bill? alternating-current-circuits Have a read of the note and if you are still unclear, you can add a comment to post. phase 2 apparent power = 70 x 230 = 16,100 VA = 16.1 kVA Three phase simply means you have three windings instead of one; giving you the A, B and C phases (and if star connected a neutral conductor). You still have your three phase system, with the current in each line being slightly different (if all the line currents were the same it would just be a balanced three system). I expect it to stay the same. Easy enough. Kindly show the computation. As an example, consider a load consuming 23 kW of power at 230 V and a power factor of 0.86: Note: you can do these equations in either VA, V and A or kVA, kV and kA depending on the magnitude of the parameters you are dealing with. I measure the Power (kW) required by the electrical motor. After displaying the value of Voltage, Current of each Phase, Instantaneous Active, Reactive & Apparent Load, Frequency and Power factor in your continuous press. Divide kW by the power factor to get the kVA. Thanks for pointing out the mistake. Insert these 3 quantities in the calculator, and you should get the same result. thanks :), Hi, I believe your equation I = kW / ( 3 x pf x VLL ), in kA Should VLL not be VLN here? Using this power formula, we can, for example, do a 3-phase motor kW to amps calculation. How Long Does It Take To Thaw A Frozen Air Conditioner? Sometimes energy companies will bill you based off of an estimate that was generated from your homes previous use, which means you could be charged a higher bill just because those who lived in your home previously consumed a lot of energy. To convert from VA to kVA just divide by 1000.
21,000 / 230 = 91 A. Current meter reading Meter reading reported from last months bill = Total kWh used since last reading, Total kWh used since last reading x Charge per kWh = Total energy charge, Total energy charge + Fixed monthly fees = Final bill. John, line voltage is dependant on country (and varies within countries). If remembering is formulae more easy, just go with that. Also, thanks again for posting and all of your help. Because you have an unbalanced system, you will have some current in the neural line.
You do not need to multiply by 3. to get the total current. All parameter of our electric grid can be possible to store in a smart electric meter. You can calculated this be summing the A, B and C phases, taking into account the phase difference (easiest to do this using complex notation). (Or How Much Is Left? You can find more information on power factor here: http://myelectrical.com/notes/entryid/197/power-factor As a note, it is possible to have a different power factor in each phase of a three phase system. I know that it is right but how can i used it to find the value of complex power?? thanks. I thought Y systems had lower line currents and that was one advantage to using them. Planning to make the new site live in about a week. I understand a little more now (perhaps not fully). The result is the total amount of kWh youve used since your last meter reading. The more you drive your car, the more miles will be displayed on your dashboard. The kW in your formula is the three phase kW, so I think you should be using 746 (not 249). This is typical of power transmission systems, electrical motors and similar types of equipment. I deal with unbalanced systems on a frequent basis and am trying to figure out how to calculate the amps drawn on each leg. unbalanced phase shift), then it is necessary to revert to more traditional network analysis. When thinking about watts (W) or kilowatt (kW = 1000 W) it can be useful too keep in mind the fundamental ideas behind the unit.
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