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AC mains input impedance

Discussion in 'Electronic Design' started by Scott Ronald, Mar 2, 2008.

  1. Scott Ronald

    Scott Ronald Guest

    Hi

    Does anyone know what a ballpark value for the input impedance at 60Hz
    for North American AC mains? Or does this vary wildly from region to
    region.


    Scott
     
  2. Phil Allison

    Phil Allison Guest

    "Scott Ronald"

    ** Why not just measure it ??

    Use say a kettle that draws a known current - 12 or 15 amps.

    Monitor the AC voltage on a DMM when it is connected.

    Use ohm law.


    ....... Phil
     
  3. It is dependant upon the load you are using. It is the voltage drop/load Current.

    http://www.teal.com/products/App note AN-10.htm

    Usually you will see the UL required mains impedance on the device label. This is the maximum Impedance require for proper
    operation.

    Cheers
     
  4. Phil Allison

    Phil Allison Guest

    "Martin Riddle"
    "Scott Ronald"

    ** Nonsense.

    Line Z is a parameter or the ACsupply and hence is independent of the load.

    ** Good, basic link.
    ** Huh ??

    On what planet is the usual ?


    ........ Phil
     
  5. Tim Wescott

    Tim Wescott Guest

    Do you mean the line's behavior at 60Hz, or are you trying to use it for
    power line communication or something?

    --
    Tim Wescott
    Control systems and communications consulting
    http://www.wescottdesign.com

    Need to learn how to apply control theory in your embedded system?
    "Applied Control Theory for Embedded Systems" by Tim Wescott
    Elsevier/Newnes, http://www.wescottdesign.com/actfes/actfes.html
     
  6. me

    me Guest

    Totally idiodic!


    What possible reason is there to even ask such a stupid question?!?

    For anything you can possibly hook up to it, it is essentially zero....
     
  7. Phil Allison

    Phil Allison Guest

    "me the ego tripper "

    ** It ain't stupid at all - fuckwit.


    ** Not one bit true.



    ........ Phil
     
  8. me

    me Guest

    ok, what reason?

    how not?

    do more than gas. (that is what I'm doing here (no cooping a squat on my
    territory))...
     
  9. Phil Allison

    Phil Allison Guest

    "me the ego tripper "

    ** Many reasons exist to know the impedance of power source.

    If YOU cannot imagine even one - it is because

    YOU are a TERMINAL FUCKWIT .



    ** It ain't zero.

    It has a significant effect on the PSUs of many high current draw devices.



    ...... Phil
     
  10. me

    me Guest

    You are a total assbag. There is no reason to care about the impedance
    of mains source. You use best/worse case voltage in any design.

    No, see above, assbag.
     
  11. Eeyore

    Eeyore Guest

    Why do you think there's 'flat topping' of the mains supply ?

    Graham
     
  12. me

    me Guest

    Still nothing? How sad.
     
  13. Eeyore

    Eeyore Guest

    Are you an idiot ?

    Graham
     
  14. me

    me Guest

    Is that supposed to be a technical response or just a donkey response?
     

  15. He is a fucking retard, but you top him by far. Go back to school,
    little boy.
     
  16. Jamie

    Jamie Guest

    HeeHaw!!!!!!!
     
  17. legg

    legg Guest

    Do you mean the impedance of the mains source, when driven as a load?

    This varies widely over frequency, and is heavily dependent on
    location and service class.

    This is an RF study of a typical household:

    http://www.ofcom.org.uk/static/arch...nce/documents/uktwg/finalreport/appendixq.pdf

    Power line modem proposals like CENELEC SC205A make good reading.

    At the power frequency, impedances are characterized by loading
    effects and may be in the tens of milliohms.

    RL
     
  18. legg

    legg Guest

    There's a measurement technique suggested by Kwasniok, Bui, Kozlowski
    and Stuchly in the IEEE Transactions on EMC Vol35 #1 Feb'93.

    RL
     
  19. Nico Coesel

    Nico Coesel Guest

    It is not. Every conductor has a capacitance and inductance. Because
    of the vast distances of the mains grid, the inductance has a
    significant influence. The mains is not only used to supply power, but
    also to remote control stuff like lantarns and metering devices (over
    here there is a day and night tarif). And there are all kinds of
    standard to transport data over mains. My guess is the OP wants to
    build or use a device that transports data over the mains.
     

  20. Always an ass, aren't you?

    --
    Service to my country? Been there, Done that, and I've got my DD214 to
    prove it.
    Member of DAV #85.

    Michael A. Terrell
    Central Florida
     
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