Three phase Definition and 83 Threads

Hello everyone: I have a quick question regarding connecting a three phase power supply to the coils of a three phase motor. Now I know that if you had 3 pole pairs, 6 coils 120 degrees apart around a stator, that each diagonally adjacient coil gets connected in series and each of these...

Dear friends, 3 phase ind motor is overheated and also tripped during operation. The heat over the induction motor is extremely hot. What will be the reason? Is it due to coil damage inside of motor.? Kindly reply, thank you!

Why we are using Three phase & single phase instead of using two phase , four phase, five phase.

What type of circuit can convert single phase electric power into three phase electric power? Can the circuit diagram be posted in this thread?

Hello everyone I am trying to make a small three phase ac stator so a rotating magnetic field will be produced. I can use a ring with an outer diameter of 3 inches and an inner diameter of 1.5 inches with each of the six poles being 1 inch with about 100 turns of 24 magnet wire or a ring with...

Homework Statement So here is the Problem : I am Modelling an interesting problem for a project i am busy with. I need to find out the force exerted on a single busbar in a 3 phase system, with each phase carrying 3300A. This is mainly so that i can deduce what size of busbar supports i...

Hello! I wanted to know if it is possible to calculate the rotor slip if I know the output torque and rpm shaft. I also know the equivalent cicuit of the motor: Rs, Rr, Ls, Lm and Lr. Thank you!

Homework Statement A balanced three phase Y-connected source has a line voltage of 208V and feeds two balanced Y-connected loads. The per-phase impedances of the two loads are 20+j70 and 50+j30 ohms respectively. Calculate the power supplied to each load by the source. What is the power factor...

I am using the "Three-Phase PI Section Line" Matlab-Simulink block from Simpowersystems blockset for modelling an electric power system transmission line. I had obtained the data from a research paper regarding the transmission line specifications (provided as sequence values). Since I am...

Hello all, Recently one of the power meters on one of our office's panelboards has been giving sensor garbage, calling the others' measurements into question. I have two 277/480Y transformers, one going to a two phase 480V duct heater and one going to the lighting (the meter reads three...

Hello, I have come to this forum as I don't believe what i am being taught to be entirley accurate and need some clarity on a question (not an exact answer, this is not homework) To begin, I believe the person 'teaching' my subject is not up to standard as when our final topic of three...

Hi We are measuring 3 Phase Power of an asynchronous Motor-Generator and have equipment installed on Phase 1 (L1) and Phase 3 (L3) to measure the current/voltage/power. I have some questions regarding the results. Q) Why is the Power of Phase 1 positive and Phase 3 Negative ? Q) How can...

Can anyone with knowledge of three phase system please explain the concept behind phasor diagrams and how to draw one based off given phase angles for both current and voltage? Thanks in advance for your time.

Suppose you have a 3-Phase AC transmission line circuit with a phase to phase RMS voltage of 100 kV @120 degrees (100/root3 kV, phase to ground). Now alongside this line is another 100 kV RMS phase to phase 3-phase line. What is the highest RMS voltage that can exist between the near phase...

Hi guys, Im having some trouble with a question about 3 phase power system. I have a balanced delta connected load of 30+18.86j ohms. The voltage is given as 400v @Hz and I am asked to calculate the phase voltage and current using the voltage Vr as the reference. Now from my knowledge of 3...

Hello, I am an Electrical Engineering student taking my second circuit analysis course. My program is actually very good and they explain things very well. My main concern is that none of my courses have covered or much less mentioned 3 phase power. My first question is simple: Are they skimping...

Hi, I’m really stuck on a problem for my final year project in my taught Masters degree and any suggestions what might be going wrong would be greatly appreciated. I’m trying to run a three phase delta connected induction generator on a single phase supply using a Steinmetz connection. The...

Homework Statement Can someone tell me how the (square root of three) factor is derived in a three phase generator? Homework Equations The Attempt at a Solution

i was reading three phase ac supply and this statement is quite confusing ''because of the 120 degrees phase shift the voltage across any two lines is 400 volts (the voltage across each of the lines connected to the terminals is 230 volts) can anybody please explain it??

I live in India . I have Three Phase Line in my Home & Single Phase Line in Office . However the rates for both Single Phase & Three Phase are the same ( Rs.2.70/unit for first 50 units , Rs. 3/unit for next 50 , Rs. 3.60/unit for next 100 , Rs. 4.20/unit for next 100 & Rs.4.70/unit thereafter )...

Homework Statement consider the balanced three phase star source with RMS phase voltage magnitude of 230V shown in fig5 with an impedance of Zg=5+j5.The per-phase impedance value of a three phase balanced star and delta connected loads are 30+j30. a)Determine the line and phase voltages and...

Hi i want know about two phase and three phase which is more using?.. In where and what is use of more then three phase and in where :smile: thanks

I have a motor i am trying to get to work. The tag on it says its a three phase asynchronous motor. 110v and i think the current is 6.9amps. When i turn it on it hums and if i spin the motor it will start to go and will spin very slowly but as soon as any resistance is applied it stops and just...

Homework Statement Draw a graph of the output voltage waveform of a 3 phase half wave rectifier (unfiltered), when the AC. input voltage is 24.0 V rms. Label both axes with a title and scaling, and indicate peak and average output voltage levels. Homework Equations Average output...

Homework Statement Three impedance of 10+j6 are delta connected to a three phase 208 V power line. I am to find The Phase currents, and Line currents. I am just learning this so bear with me please. I am correct to assume that the voltage across each impedance is the source voltage of...

Homework Statement Three impedance of 10+j6 are delta connected to a three phase 208 V power line. I am to find The Phase currents, and Line currents. I am just learning this so bear with me please. I am correct to assume that the voltage across each impedance is the source voltage of...

I was just looking for some insight on this problem. It is not a homework problem, my boss just asked me to figure it out. Now, there is 120V supply, with 600 feet of cable (copper) running to a load, and 600 ft neutral coming back to the supply. Ignoring the resistance of the load, he asked...

hey does anyone know the effiency and power factor of a typical three phase induction motor? cheers,

Hi, In the attached file, the question asks to find the three line currents. I understand the solution using Mesh Analysis that was used. However, I am unsure as to why when I convert the Delta Load to a Wye load, I get the wrong answer. Using Zwye = (1/3)Zdelta, adding the series line...

Hi, In the attached file, the question asks to find the three line currents. I understand the solution using Mesh Analysis that was used. However, I am unsure as to why when I convert the Delta Load to a Wye load, I get the wrong answer. Using Zwye = (1/3)Zdelta, adding the series line...

I am designing a three phase permenent magnet generator , and have a question. as a magnet pair passes over a coil , inducing a voltage, that voltage is most dependent on ? 1) the angular velocity ( that's a given) 2) the pole strength 3) flux density 4) energy product. 5) thickness of...

I am a little embarassed asking this, as I was an aircraft electrician at one time, but have since forgotten the answer. :bugeye: When dealing with house electricity, you commonly hear the terms two phase and three phase. Now I understand this to be that the 'waves' are 'out of phase' by a...

what are the major different other than the reason why you do three phase for motor and advantages. In detail in wiring why do you have 4 lines in three phase goig into three terminal and 4 lines goign into two termnial in single phases? what is the best way to give a summary to a person who...