How can I convert a 3 phase 415 Volt delta induction motor to 3 phase 240 Volts delta?
550835
The motor is designed for 415V 3ph which produces a magnetic flux which in-turn provides torque and horse power. By reducing the voltage you reduce the capability of the motor, or reduce the horse power. \n\nTo have an equilvalent HP motor at 240V 3ph you essentially must rewire the stator and armature windings.\n\nWhat you can do is use a Auto-transformer and step up the 240V 3ph to get 415V 3ph out. But the ampacity is reduced, Power in = Power out (watts). This may be sufficient for your needs.
1085514
The max sytem load for 3 phase 208v Y 30kva 100% 89 Amps, so buy a 100 amp this will give you  an upgrade if ever needed and be safe.
459399
You must understand power in = power out.\nSo the P(in) = 200A * 240V = 48000Watts \nTherefore, to obtain 400A out put you will sacrifice the voltage which will = 48000/400 = 120V\nYou need a heavy duty Transformer which will handle the 400A. The wiring size is 500MCM wire. Which is usually bus bar in a cabinet.\n\nTypically 240V 3phase line to line on a delta-wye Xfmr can provide 208V line-line provides 120V line-neutral. (208/sqrt3)\n \nUnless you have a Xfmr to convert, another way would be to use an active inverter, IGBT controlled.
492458
I seriously doubt you have a 50 HP motor!  That is industrial size, and I wouldn't expect a question like that here.\n\nWhat voltage?  A 3-phase 50HP 230V motor is 130 amps!  There is no single-phase motor that big.  If you really have this, get an electrician to install it.
1065117
You need the power factor of the motor. Since that is not known, we have to assume the PF. Let the PF be 0.85. Then,\n\nI = (8.5*1000)/( sqrt 3*415*0.85) = 13.9 =14 A. You can read the PF from the motor and adjust the result.
574032
Normal household voltage is 115-120V rms single phase.  A center tapped transformer is used to give you the 115-120V across a pole to centertap or from pole to pole you will see 230-240V. This is all single phase.\n\nFor 3 phase a typical voltage from 2 phases (called line to line) is 208V rms or 480V rms.\nThe 208 is realized by having a "star or Y" setup with the center node as neutral.  Line to neutral is 120V and the 3 phases are 120° degrees apart.  That would mean the Line to Line (LL) is 120*SQRT(3) = 208.\n\nI am not certain why any voltages are specific multiples of 1.1.  The voltages that are commonly used in the USA are 120, 240, 208, 277, and 480 all rms.  Now for transmission purposes, the high side of the transformer voltage should be an integer multiple of one of these voltages.  I do know that transformers typically have integer ratios to either step up or step down the voltage.\n\nHere is some good reading for you:\n\nhttp://www.elec-toolbox.com/usefulinfo/xfmr-3ph.htm\n\nhttp://en.wikipedia.org/wiki/Three_phase_power\n\nBTW, you can become an Electrical Engineer if you know when and where to divide or multiply by either the SQRT(2) or the SQRT(3)!  ;^)
357873
Fault Currents are calculated based on the impedance of the system. Therefore, by adding line inducatance or even just lengths of wire, the Fault Current can be reduced.\n\nFor a typical 2000KVA, 480VAC 3 phase system a fault current can be more than 350,000amps in less than a second.\n\nCheck out the following: on the 'eatonelectrical' link type in Fault Current for calculations
127178
Just tradition and how they set up their power grids.  In the US we use 120/240 single phase at 60 hertz for residences and some larger buildings, depends on the application.\n\n208Y/120 3 phase is much more efficient for lighting.  However the problem with 3 phase equipment is that it's normally larger and more expensive and when a lot of structures were built owners were more concerned with the build cost of the structure than the operation cost of the structure.\n\nAlso there's residential equipment that is not readily available in 3 phase configurations.
1063180
first...identify the power source (AC or DC)\nthen...isolate the power source (lockout)\nnext...verify the circuit is not live (test)\n\nfinally...if it is AC three phase reverse any two of the three motor leads, if it is DC just reverse the two leads (if shouldn't be DC)\n\nif it is a european piece of equipment the wires should be black-black-brown, swap the blacks\n\notherwise, it should be brown-orange-yellow or black-red-white\n\nDO NOT ATTEMPT IF YOU ARE NOT QUALIFIED\n\ngood luck
755807
In order to know how 3-phases of voltage (separated by 120 degrees) are produced, one would have to know how a 3-phase generator works and know a bit about electromagnetic theory.\n\nIn nearly all power plants (except for some wind turbines), a 3-phase synchronous generator is used.  This type of generator has one or more wire coils attached to the shaft (the rotor) and a set of coils evenly spaced around the frame surrounding the shaft (this area is known as the stator).\n\nThe coils on the rotor are energized by a small DC source and become constant electromagnets with north/south poles determined by the direction in which the current flows.  The shaft is moved by a source of mechanical power.  Generally a steam turbine is used where the steam is heated from some source of energy like coal, natural gas, nuclear etc.\n\nSo as you can imagine, we have one or more electrogmagnets attached to a shaft being rotated by a turbine.  Remember that these rotating electromagnets are inside the evenly spaced windings on the stator.  Faraday's law states that a time-changing magnetic flux in a coil will produce a voltage in that coil.  Since the rotor electromagnets are constantly changing position relative to the stator coils, the magnetic flux seen by the stator coils is also constantly changing.  The wire coils on the stator frame are evenly spaced such that the induced voltage waveforms will be spaced 120 degrees apart.\n\nSo, we then have sinusoidal voltage waveforms produced on the stator coils such that they are 120 degrees apart.  These coils on the stator are then connected in either wye or delta configurations and carefully hooked up to the power grid.\n\nSo that is a somewhat simplified view of what is happening.  There are various other complications that I have not mentioned, but are not important in getting the general idea.  You might be able to find a nice 3-phase electric generator animation on howstuffworks.com or Wikipedia.
144211
i have only seen 120v motors in these ovens to be sure look @ the motor id plate. if this oven uses electric heat instead of gas the elements will be wired for 3 phase power and could possibly be converted check the wiring digram or intsallation guide
961185
You cannot do this directly. Assuming you are talking about a motor, It may be possible to get the motor to turn using a capacitor but you will not get the rated torque (turning force). I'm sure there is plenty 3 phase theory on the internet if you want to see why they are so different\n\nOne way it can be done is by using an inverter that takes single phase input (providing the voltage you require is not higher than the voltage you have or you will then need a transformer as well). The inverter gives you the added value of being able to vary the speed but it may be cheaper to simply buy a single phase motor. As you didn't actually specify the device to be motor, be aware that VSD inverters may not work on other equipment.\n\nYou need to be wary of the size of the device you are trying to operate. Often 3 phase is used for higher powered devices that becomes in-practical to try and run on single phase anyway.
564411
This company is in Mumbai. The one they show is for 180-260V, but it says you can change the range. They don't give prices, however ...\n\nhttp://www.voltamp.com/Products/cvt-constant-voltage-transformers-ferroresoant.html
739563
I am unaware of any 2-phase electrical systems.  \n \nTo get 3-phase power from a single phase (as in your home electrical) system you need to have a single phase motor run a 3-phase generator.
169878
Most AC electrical sources can be converted to other phases, voltages and currents but not to increased power (P = IE) either using semiconductors, transformers or motor generator sets (and transformers).  Usually 240 Volt AC is obtained using two phases of a three-phase distribution system where a single phase is 110 Volts nominal (perhaps 120 Volts actual or stepped up) to double voltage to 240 Volts.  However, in the lab, many different phases, voltages and currents may be required for special applications and suitable converters must be found (or built?).
1065081
high torque compared to single phase. For the same power output the size of three phase motor will be smaller and also it will be less costly.
371756
Assuming that you are not removing the SCR from the circuit.\nTry to look at the gate signal and the output at the cathode on a double beam 'scope while the servo is trying to operate. Or disconnect the gate and try to turn the SCR on from an external source and see if you get output motion from the servo or whatever the output is.Some caution required with 440 v !!Some recollection from 25 yrs ago may help ? Making a bridge  or H-switch to drive a 1/2 hp dc motor. Collected a pile of dud transistors on bench until able to prevent simultaneous turn-on down one side of the bridge. This is prevented by correct commutation and ensuring that during switching, the instantaneous power dissipation in the device remains outside the specified region.Commutation is aided by placing an air-core inductor in series with the load and then usng a secondary winding on this to make sure that when one side is conducting that the other arms are turned off.It is somewhat tricky and very critical.