Do you REALLY mean a 'two-phase' system? Two-phase systems are archaic, and haven't been used for many decades.
In North America, you can connect a 240-V load across two lines (not 'phases') of a three-phase system with a 240-V line voltage. In Europe, you would need to connect the load between any one line conductor and the neutral conductor.
You are not really connecting two phases to the primary of the transformer; you are connecting one phase. In delta configuration, each phase is actually the connection of two legs, AB, BC, and CA. Even though you are connecting two legs to the transformer, there is only one phase involved. In star configuration, however, each phase is the connection of one leg to neutral, AN, BN, and CN. In star, you would only use one of AN, BN, or CN to connect to the transformer's primary winding. Star configuration is preferred, and is actually used in the transmission/distribution system, because in delta, loss of one leg takes out two phases. Star configuration, however, would not be preferred if your local distribution was based on a non-centered neutral, such as a quadraplex connection providing split phase simultaneously with three phase. (120/240-240/3) The neutral in that case is not at the center of the star triangle - it would be at the center of one of the phase pairs.
deadlock handling by 2phase protocol
usually they say its possible 2 convert a 2phase supply to 3 phase.if its so then how?
Two-phase supplies, in which the phase voltages are displaced from each other by 90 degrees, are less economical than three-phase systems.
It is very unlikely that you will ever come across an archaic 'two-phase' system, so your question is of academic interest only. A two-phase, three-wire, system is one in which phase voltages are generated 90 electrical degrees apart and whose line voltage is, therefore, 1.414 greater than its phase voltage. So, the answer to your question is no.
In North America, you can connect a 240-V load across two lines (not 'phases') of a three-phase system with a 240-V line voltage. In Europe, you would need to connect the load between any one line conductor and the neutral conductor.
Here is the list of actual exam or homework questions the Asker wishes to have someone write the answers for him to copy without looking them up for himself: : 1) What is a slit ring and a slip ring in electrical ... (machines?) : 2) mention the application of the method of connection in brief : 3) what is the phase type (1phase, 3phase) and explain why not using 2phase : 4) what is cogging and hunting? explain briefly : 5) what is the difference between neutral and earth? explain briefly
You are not really connecting two phases to the primary of the transformer; you are connecting one phase. In delta configuration, each phase is actually the connection of two legs, AB, BC, and CA. Even though you are connecting two legs to the transformer, there is only one phase involved. In star configuration, however, each phase is the connection of one leg to neutral, AN, BN, and CN. In star, you would only use one of AN, BN, or CN to connect to the transformer's primary winding. Star configuration is preferred, and is actually used in the transmission/distribution system, because in delta, loss of one leg takes out two phases. Star configuration, however, would not be preferred if your local distribution was based on a non-centered neutral, such as a quadraplex connection providing split phase simultaneously with three phase. (120/240-240/3) The neutral in that case is not at the center of the star triangle - it would be at the center of one of the phase pairs.
winging is always constructed in 360 degrees angle. 3 phase winding is built after 120 degree angle. If a 2 phase phase wingind is designed, it is 2 , 180 degree angles winding, which is exectly same as 2 coils in series. Similarly, 4 phase has same effects, a pair of 2phase winding.
through: wires, transformers, breakers, switches, etc.Something like:Power plant wires carry electricity to plant switching farm.Switches in switching farm direct electricity to step-up transformer for a transmission line.Step-up transformer increases voltage to reduce transmission losses.Wires from step-up transformer go to high voltage breaker to protect switching farm from transmission line current spikes.Transmission line wires attach to breakers and leave plant switching farm.Transmission line wires run hundreds of miles to consumer locations.Transmission line wires enter a distribution switching farm and attach to high voltage breakers to protect switching farm from transmission line current spikes.Wires from breakers go to step-down transformer to decrease voltage for safe distribution.Wires from step-down transformer go to switches in switching farm.Switches in switching farm connect electricity to desired distribution lines.Each distribution line has breakers on it to protect the switching farm and the line.Distribution lines run to various neighborhoods.At each customer location the distribution line connects to a step-down transformer to reduce the voltage to what the customer needs (e.g. U.S. residential 120V/240V 2phase).Wires connect the step-down transformer to the customer's fuse/breaker box and distribution panel.