Single Phase to Three Phase conversion

 

In agriculture space there is often requirement of 3 Phase load in order to run their borewells and other equipment related to agriculture. But there is quite often 1 Phase Supply available for their use. Single phase motors are unable to meet their requirement and further taking 3 Phase load from Power Company is quite expensive. So what they do is they convert this single phase power supply to 3-phase supply by their own means, although it’s not allowed by they are doing by their own means.

Now question arises how to convert this single phase power supply to 3-Phase power supply.  One of  most acceptable method is by using Static or rotary Phase converters. Now these converters are very easily available in the market and you can buy them and install in single phase supply and get the 3-Phase output.

Rotary Phase Converter:-

Principle of Operation:- When we start the three phase motor using single phase than once that motor starts rotating than it will continue to rotate and generate third leg of power for three phase applications, Rotary phase converter works on that principle.

An Induction motor i.e. single voltage three phase induction motor have three windings and each winding is connected at its end terminals naming T1, T2 and T3. When we start the three phase motor using single phase supply than we will run the motor initially by using some means than it will keep on rotating at 2/3^rd HP of single phase power applied to single winding.

By doing so three phase induction motor which is running under single phase power supply (which is applied at terminals T1 and T2) will generate voltage at T3 with respect to T1 and T2. By doing so what we will get is phase difference of 120 degree between          T1 and T3, T2 and T3 with respect to applied voltage. Thus we will get three phases.

Applications:-

These generate true three phase power. Unlike Static phase converters which provide power during starting of motors these generate three phase power during continue running of machines. 

Further Rotary phase converters are used for high power applications and can function for more than one piece of equipment at a time. These can handle complex load applications.

These are used for following types of loads:-

(i)                  Pumping systems

(ii)                Hydraulics

 

Rotary phase converters are very efficient in terms of providing balanced power.

Static Phase Converters:-

These types of converters will start your load at 3 phase and then switch back to single phase. This will be done by disconnecting the circuit after startup which will further limit the load to 2/3^rd of rated capacity. These type of converter are used in application requiring high torque during startup and but not required during running applications. These are most widely used in applications as below:-

(i)                  Drill presses

(ii)                Table Saws

(iii)               Milling Machines