How do I connect multiple (two or more) 3 phase ac power sources (from wind turbine alternators) to a single 3 phase junction to power one device?

Hi Bill
I may be wrong here......
But I've been around Electricity for a long time.
Have Never seen a device that does phase conversion.
A Building site or home will either have Three Phase or Single Phase Power Available
BUT...A portable (Hired) generator could be "three phase" and you could use any one of those phases individually or all three phases.

I have 3 Phase supply to my house!
But I use 230 volt Single Phase for appliances.
My Bore Pump uses a 3 Phase Motor,
(so with a voltmeter it would read about 440 vAC to the pump motor).
Some Further Info:
A GENERATOR is basically a motor used the opposite way. Rotate a motor and it Generates.
The Phases refer to the THREE Windings in the supplying generator in your suburb.
A Large Magnet passes each winding in sequence giving you the three ripples in the supply.
Our houses can choose to have 1 Phase or Three Phases from the street when you set up your electric supply.
So... to confirm, look at the wires on the supply poles to the premises. Usually three in our area (Oz)
Most people are not aware that a car Alternator is actually three phase. The Rotor is the magnet that rotates.
The only difference with an Alternator is that each "Phase" is connected to 2 Diodes (6 total) to convert the three phase to DC to charge the vehicle.
The Regulator controls the voltage to the Rotor, thereby controlling the output.
So.... An Alternator could in theory supply 3 Phase in a mobile generator. Custom Made. Constant speed would determine the frequency of 50Hz or 60Hz.
Not sure what country you are in

Hope this Helps or gives you food for thought!


Three phase electric power

A one phase 3 wire system has a center tap. Two hots and a neutral. Typical 120/240 volts.
A three phase 4 wire system has Three hots in a Y or Delta. The Y system has three hots and the neutral comes from the center of the Y, this is the neutral and grounded conductor, 120 volts from hot to ground and 208 volts hot to hot. In a 3 phase system the voltage is not doubled hot to hot as in a single phase system because the hots are 120 degrees phased from each other and the square root of 3 is the factor, multiply the 120 volts by 1.73 to get 208 volts hot to hot. Multiply 208 by the reciprocal of 1.73 and get 120 volts. Your exact application is not given so it is not known. A delta system is a triangle and the angle of each triangle is a hot wire, one angle would be grounded or the center tap of one of the sides of the triangle. Y is the configuration of the windings of the alternator or transformer and Delta is the configuration as a triangle of the windings of the alternator or transformer where the power supply is.

With a three phase home service, you can only connect two hots from your single phase generator, and the neutral. One of the house's hot does not get connected and any three phase loads in the house should be switched off and kept from energyzing or a circuit breaker or fuse serving that 3 phase load may trip.
Only one power supply can be connected at a time. The power company power must not be connected at all while using an alternate power supply unless your power supply has means to synchronize the alternating cycle.

It is adviced that the loads be kept within 10% of their rated voltage, especially motors.

there is no motor that is single phase with 415 volts only 240 volt or 120volt and you cannot use a 3 phase motor on single phase it will just fail to start buzz and burn it up .single phase motors have capacitors 3 phase motors do not

THIS IS A CLASSIC , THE GREEN ONE GOES TO GROUND THE OTHER 2 DON'T MATER LONG AS YOU DO NOT PUT THEM ON TOP OF EACH OTHER. THIS IS NOT LIKE YOUR CAR WITCH IS DC..THIS IS AC ALTERNATING CURRANT ..ALTERNATING ! .. YOUR POOL PUMP MOTOR REPAIR GUY IN LONGWOOD FLORIDA

You cannot do this... 3 phase and single phase cannot be inter used... see 3 phase is 440 V AC, single phase is 230 Vots AC. This is unless the unit has Dual capability, in this case the wiring could only be wired to a Single Phase. of the unit. You will need a slow blow breaker of the correct rating and also the cable must be similarly CURRENT rated. If it IS only 3 phase, you can purchase after market single phase to 3 phase converters, that will allow you to plug the 3 phase into a single phase circuit and work, they quite costly though.

It is indeed possible to use ONE Phase to run a motor, You simply use One Phase and Neutral. BUT ONLY if the 3 phase is Double, more or less, the required usage Voltage, EG: 440 3 phase, will be OK, for 220 single phase, . But 220 3 Phase,will not run a 240. single Phase. So in your case is suspect not, it really will do no harm to try though. it just wouldn't work, if not enough "juice", be careful.
http://en.wikipedia.org/wiki/Three-phase_electric_power

3ph motors will only run on 3ph power, trying to single phase will only burn up windings,