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3 Phase Electrical Formulas
Before starting we should know what a phase mean. Basically it relates to the timing of magnet which passes over the coil at different times. So a 3 – phase – electrical – formula is nothing more than having two extra coils which is slightly out of time with the first coil. In a 3 – phase – electrical we would be having 3 coils for each pair of magnet. In each cycle of power a 3 – phase – electric system have three voltage and current wave which is form are 120 degree offset . By this we mean that every single voltage wave has a phase difference of 120 degree to the other voltage wave form. Each current wave form also ha s a phase difference of 120 degree to the other current wave form. The definition of three phase power states that three individual single phase power is carried out by 3 separate power circuit in an electrical system. An ideal 3 – phase – electrical system implies balanced system. If one of the three phase voltage is not equal to the other than a three phase system is said to be unbalanced. Even the value of phase angle in between the respective phases is not exactly equal to 120 degree.
Generation of three phase power is more economical than generation of single phase power. There are some other advantages of three phase power over single phase power. Like to start a single phase motor we have to apply some auxiliary mean but on other hand three phase motor start itself without providing any external mean. In ratings also three phase machines is 1.5 time good as compare to single phase machine. A three phase power is more preferable for high tension power loads as compare to single phase. Single phase power equation is time dependent function on other hand three phase power equation is time independent constant function.
By this we mean that single phase motor is of pulsating nature which in return produces excessive vibration in large rated motor. Three phase system have good efficiency and also great power factor as compare to single phase system. Other fact about three phase is that most electric power in world is three phase. In a same power range three phases is 150 % more efficient than single phase. In three phase system the power never drop to zero on other hand in single phase power drop to zero three times during the cycle. In three phase system the power which is delivered to the load is same at any instant. It is not in single phase system. 75 % is the size of the conductors is needed in three phase system to have an output of same power which we have from single phase. By this we can see that three phase power is all the way good for us if we compare to single phase. For our house hold appliance we may need single phase system but as we know that three phase is a lot better from single phase. We have set category of distribution of phase for residential for commercial and for other also.