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Both single and three phase generators provide AC electrisity but a 3 phase generator produces three separate waves of electrisity at the same time. This ensures a continuous uninterrupted flow of power that never drops to zero.
Single phase systems deliver one constant wave of power, but the power level varies. That means the electrisity levels can and do drop to zero during the cycle. This happens to quickly to have an effect on your device. Residential power is single phase and there’s never a problem there.
Single phase systems are less complex and cheaper. 3 phase systems are more costly to install and maintain, but depending on your power needs, they may be a necessity.
Are needed for high-capacity situations like industrial and commercial areas. Data centers, need 3 phase back-up generators due to the increased distribution capacity. 3-phase systems can power multiple racks whereas single-phase systems can’t.
Why do we need 3 phase power supply?
There are several reasons 3-phase is desirable over 1-phase power. One advantage of 3-ph over 1-ph has to do with instantaneous power (i.e. power generated or consumed at any instant in time within the power cycle).
Consider a heating element in a 1-phase circuit. Voltage and current are in phase. Both cross zero volts twice during a cycle as they go positive and then negative.
Three-phase systems can produce a rotating magnetic field with a specified direction and constant magnitude, which simplifies the design of electric motors
In 3-phase power distribution, it requires lesser amount of copper or aluminium for transferring the same amount of power as compared to single phase power.
The size of a three-phase motor is smaller than that of a single-phase motor of the same rating.
A single-phase supply system, the voltage and current reaches its maximum value after every 0.02 seconds, but in case of the three-phase supply system, each phase reaches its peak value after every 0.006 seconds. That is one major advantage.
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