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Thread starter stevee Start date Dec 7, Status Not open for further replies. Ok, probably a simple answer, or maybe not but let me ask anyhow. The panelboard is used for lighting load operating at V. The lights are single phase, V. The connected load between phases A and B is 40A The connected load between phases A and C is 30A The connected load between phases B and C is 30A What would the current be on the conductors supplying power to the panelboard?
In other words with the above connected loads Is there a simple formula to calculate the individual currents on each phase?
Location Los Angeles, Ca. Just think of it as a semi-panel schedule. Divide the watts up between phases like you would do in a panel schedule, i.
Add up the VA for each phase till you get a subtotal for each phase then divide by L-N voltage and get the load current on each phase. Please post the entire solution for the above problem if possible. Location NE Nebraska. Location Connecticut Occupation Engineer. I think this method makes the most sense to me. View attachment The 1. But it's really pretty straight forward math. Until you try the symmetrical components You are correct.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.Nyc subway hmmsim
While some colleagues prefer to remember formulas or factors, I prefer to resolve the problem step by step using basic principles. I thought it would be good to write how I do these calculations.2008 kenworth t800 flasher location
Hopefully it may prove useful to someone else. The product of the voltage and current is the apparent power and measured in VA or kVA. The relationship between kVA and kW is the power factor pf :. Single phase system - this is the easiest to deal with. Given the kW and power factor the kVA can be easily worked out. The current is simply the kVA divided by the voltage.
As an example, consider a load consuming 23 kW of power at V and a power factor of 0. To convert from VA to kVA just divide by Three phase system - The main difference between a three phase system and a single phase system is the voltage.
To me the easiest way to solve three phase problems is to convert them to a single phase problem.
Take a three phase motor with three windings, each identical consuming a given kW. The kW per winding single phase has to be the total divided by 3. Similarly a transformer with three windings, each identical supplying a given kVA will have each winding supplying a third of the total power. Easy enough. 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. As a rule I remember the method not formulae and rework it every time I do the calculation. When I try to remember formulae I always forget them soon or become unsure if I am remembering them correctly. My advice would be to always try remember the method and not simply memorize formula. Of course if you do have some super ability at remembering formula, you can always keep to this approach.
The above method relies on remembering a few simple principals and manipulating the problem to give the answer. More traditionally formulas may be used to give the same result. These can be easily derived from the above, giving for example:. The above deals with balanced three phase systems.However, one of the most elusive causes of compressor motor overheating and failure is voltage unbalance.
This article will address voltage unbalance in three-phase compressor motors. Voltage Unbalance Voltage unbalance can be found with a voltmeter by measuring between phases on the compressor's motor terminals, at the disconnect, or at the contactor or starter terminals. Some of the more common configurations in three-phase motor windings are the Wye and Delta configurations.
By measuring voltages from Line 1 to Line 2, Line 2 to Line 3, and Line 3 to Line 1, and performing a few simple calculations, a technician can determine if there is a voltage unbalance problem. Voltage unbalance exceeding more than 2 percent in three-phase systems can cause current unbalance among the windings. These, in turn, can cause an increase in winding temperature and an overheating problem that can be harmful to the motor.
How to calculate the unbalanced neutral current in a 3 phase circuit
The three-phase motor terminals are connected directly to the motor windings. The motor windings are housed in the motor barrel. The motor barrel houses, protects, and cools the motor windings as superheated refrigerant gas flows through it. Measurement Examples Step 1. Step 2. Step 3. Find the unbalance for each phase by figuring the difference between each phase voltage step 1 and the average voltage step 2.
Step 4. Take the largest unbalance in step 3 in this case, 5. As mentioned earlier, a voltage unbalance exceeding more than 2 percent in a three-phase system can cause excessive current unbalance among the windings. This article's sample voltage unbalance 2. As you can see, the 2. He can be reached by e-mail at tomczykj tucker-usa. I want to hear from you. Tell me how we can improve.
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By visiting this website, certain cookies have already been set, which you may delete and block.This assumes unity power factor, which is an acceptable assumption. But working backward from these formulas doesn't seem to go anywhere easily. Thanks to Wikpedia, here is a primer on three phase power. If you post your actual numbers, we can perform and duplicate your results and give further assistance.
From Wikipedia, the free encyclopedia Jump to: navigation, search This article is about the basic mathematics and principles of three-phase electricity. For information on where, how and why three-phase is used, see three-phase electric power. In this article angles will be measured in radians except where otherwise stated.
The plotted line represents the variation of instantaneous voltage or current with respect to time. This cycle will repeat 50 or 60 times per second, depending on the power system frequency. The colors of the lines represent the American color code for v three-phase. Elementary three-wire three-phase alternator, showing how the phases can share only three transmission wires. Generally, in electric power systems, the loads are distributed as evenly as is practical between the phases.
It is usual practice to discuss a balanced system first and then describe the effects of unbalanced systems as deviations from the elementary case.Frida kahlo pdf
An important property of three-phase power is that the power available to a resistive load,is constant at all times.
To simplify the math, we define a nondimensionalized power for intermediate calculations. Hence substituting back :. This is essential for keeping large generators and motors running smoothly. For the case of equal loads on each of three phases, no net current flows in the neutral. The neutral current is the sum of the phase current. We define a non dimensionalized current. Hence also f.Forums New posts Search forums. What's new New posts. Log in Register. Search titles only. Search Advanced search….
We only have 3 phase power in our class. I built a simple circuit with 2 equal loads on 2 seperate phases with a shared grounded conductor.Hp officejet pro 8710 firmware downgrade
I figured that the current in the grounded conductor in a three phase circuit would not be as low as in a single phase situation, but it would be significantly less than in the 2 hots. When we measured the currents, the neutral was almost the same as the hots. So does anyone know the formula for calculating the current in the grounded conductor in an unbalanced 3 phase circuit?
I went over lots forums and archived forums and couldn't find any thing. I appreciate any help you can give. I kinda like this site Location Iowegia.Only certain fields are "putable". This method is idempotent. DELETE DELETE Deletes a resource.
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Three Phase Current - Simple Calculation
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