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  1. #1
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    WHY 50/60 Hz????????

    Hello,

    i have 2 questions that may hit anyone's mind working in the field,

    1- Why Northa America uses 60 Hz as operating frequency in power systems & electric machines & residental appliances while the rest of the world uses 50 Hz??

    2- Consider the well known 50 or 60 Hz to be the same,, Why not using 100, 150 or 200 for that matter?????

    Your answers r highly appreciated

    Best Regards & Thx........

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    Re: WHY 50/60 Hz????????

    I can't answer the 50/60Hz point, but using AC becomes a problem over very long distances because of reactances. Capacitance in AC power lines limits the distance over which power can be carried. You may be surprised to know that for very long distances DC is preferred (and actually implemented in various part of the world like Canada)! The advances in electronic inverters makes this very easy these days. Raising the frequency above 60Hz will make the reactance problem much worse.



    •   Alt4th March 2006, 17:49

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    Re: WHY 50/60 Hz????????

    This link is very informative -- I think it should answer most of your questions.

    http://www.school-for-champions.com/..._volt_freq.htm



    •   Alt4th March 2006, 18:04

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    Re: WHY 50/60 Hz????????

    Nikola Tesla calculated that frequency,but why 50-60 Hz?
    for higher frequencies the inductance (2ΠfL) will increase dramatically,increasing the impedance which leads to power line loss.
    Freqquency also effects machines & generators at thier speeds voltages.
    50 to 60 Hz is the effictive range.
    TeE ThE EdE.

    Added after 4 minutes:

    1- Why Northa America uses 60 Hz as operating frequency in power systems & electric machines & residental appliances while the rest of the world uses 50 Hz??
    I think this is an industrial policy.
    TeE ThE EdE.



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    Re: WHY 50/60 Hz????????

    It is interesting to note that the wavelength of a 60Hz wave is 5000 km which is roughly 3000 miles and this is approximately the the distance coast to coast (Atlantic to Pacific) of the United States.



    •   Alt4th March 2006, 20:45

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    Re: WHY 50/60 Hz????????

    Bulk DC power transmission will be one of the topics for the next international conference of AC & DC power transmission.

    http://conferences.iee.org/acdc/wednesday.htm



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    Re: WHY 50/60 Hz????????

    i suspect the frequency has something to do with the way of the generator working. also, 60/50 look pretty arbitrary, actually in Japan there are both 60/50 systems/areas

    Quote Originally Posted by Kryptonite
    Hello,

    i have 2 questions that may hit anyone's mind working in the field,

    1- Why Northa America uses 60 Hz as operating frequency in power systems & electric machines & residental appliances while the rest of the world uses 50 Hz??

    2- Consider the well known 50 or 60 Hz to be the same,, Why not using 100, 150 or 200 for that matter?????

    Your answers r highly appreciated

    Best Regards & Thx........



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    Re: WHY 50/60 Hz????????

    i think its 60Hz for reasons of calculation

    60 X 6 = 360 so its easy to do phase calculations in base 10 using 60 hz fundimental


    look here for many different grids

    http://www.worldgrid.net/

    a good software for research into grid systems

    you see its quite simple

    the TV

    tv runs at 60hz needs 60 frames per second
    so the picture isnt dull if you use fast switching lights

    eyes run at 25 - 30Hz frame rate

    who knows???

    i think its all a matter of exactly what voltage you transport

    forinstance in 60Hz zone
    you usualy find main distribution pilons is 1 million volts
    for 50hz this is a lower voltage around 750,000

    as the wire is a certain thickness and purity
    its all calculated for max transfer of energy and less heat etc etc

    just differtent approch... i beleve in japan there is a 110 100hz supply for goverment purposes

    maybe metric and imperial systems ... as
    1" = 1 second of arc = 1 second of time in imperial systems
    not the same in cm's



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    Re: WHY 50/60 Hz????????

    I don't know the reason about why 50 or 60, but take care of the 50/60Hz switch on the table clocks. They usually takes the zero crossing of the line signal to move its internal counter and keep the pace, so, if you feed with 60Hz a clock inteded for 50Hz, it will not blow off but will be out of time (advanced)...



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    Re: WHY 50/60 Hz????????

    Kryptonite,
    In the interest of further muddying the water, the standard frequency for aircraft power is 400 Hz. The higher frequency is preferable because it allows less iron to be used in magnetic components, thus reducing weight.
    Regards,
    Kral



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    WHY 50/60 Hz????????

    One more interesting note:
    TV's used 60Hz refresh rate because of the lack of good filters and shielding back 60 years ago. If locked to the power line freq., the effect of the hum is stationary and less noticable.

    When color came out, the refresh rate, now being related to the color carrier is actually 59.9999, which is why, when you lose a power supply filter now the "hum bar" in the picture moves up the screen slowly.

    Someone correct me if I'm wrong, but I believe the PAL standard is locked to 50Hz for Europe.



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    WHY 50/60 Hz????????

    Generally, Transformers of 60Hz are smaller in size with respect to those of 50Hz, when they have the same capacity; On the other hand, current in the 50Hz system has less reactance than that in the 60Hz system.



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