Why 220v 50hz

Now a day, we can not speak about any other frequency for power supplies , although they might be more economical and more secure, since all of our designs in power system network are based on these frequencies. Actually many years ago 25 Hz was common mainly because early generation was dominated by hydroelectric plants. The turbines were slower and a lower frequency meant you didn't have to build so many poles into the machine. I don't believe flicker was an issue since that actual cycle of dim-bright is twice the electrical frequency as the filaments will heat up every half cycle.

When generation became more common in cities it was almost always steam turbine driven and tended more to higher frequencies. Higher frequencies don't require as much iron in transformers as the flux has less chance to build up. AC distribution on airplanes is sometimes Hz to keep the weight of transformers down. Higher frequencies lower the ampacities of cables due to skin affect, and overall impedance is higher for the same line inductance when the frequency is higher.

Of course one could debate the optimum Hz value for each situation, but it is more important to stick to the standard that has been agreed on. The driving force in the nineteenth century that determined the supply frequency was to balance efficient distribution against the needs of traction. For example with 50 Hz, generator will be running at rpm against rpm with 60 Hz.

Why is 60Hz frequency used in America instead of the 50Hz used in most of the world? The use of 50 versus 60 Hz is purely due to historical reasons, with companies in the US making 60 Hz equipment and those in Europe making 50Hz equipment so that they have a monopoly. This rivalry led to the split you see today. The voltage and frequency of power supplies are different around the world. Most countries and regions use V V, V 50Hz.

We should be aware that why use 50Hz or 60Hz, rather than lower or higher frequency. In electrical system, frequency is a very important basic element, not arbitrarily determined. In many cases an appliance made for volts 50 hertz will work fine at the same voltage but 60 hertz.

Some motors may be a bit weaker in the 60 Hz grid, but usually the design has big enough margin of safety that this should not matter.

Frequency is the unified operating parameter in the whole power system. A power system has one frequency only. Most Asian and European countries use 50Hz frequency.

American countries use 60Hz. The difference in grid frequency depends on different calculation habits. The large-scale power generations in America are earlier than other continents. At that time, the calculation tool was British duodecimal number system slide rule.

For easy calculation, they used 60Hz. And then later, the power grids use decimal calculation, 50Hz is more convenient. List of worldwide mains frequencies:.

The special circumstances in airport: aircraft generators require small size, light weight, the only way to meet the power requirements is to increase the frequency, so the corresponding electrical equipment on airplanes should be Hz, and aircraft-related power supplies is Hz , military uses even higher frequency. Aircraft power supply uses Hz is in order to reduce the size and weight, it is a complex system.

In case of same voltage, what are the differences of 50Hz, 60Hz and Hz power supplies in transmission and efficiency? Which connection is better for Capacitor Bank Star or Delta? What is the Meaning of mAh in Battery? Difference between Analogue, Digital, and Power Electronics.

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