look at this circuit

Discussion in 'General Electronics Chat' started by Highlight, Jul 9, 2012.

  1. Highlight

    Thread Starter New Member

    Nov 26, 2010
    28
    0
    ................
     
    Last edited: Jul 13, 2012
  2. Papabravo

    Expert

    Feb 24, 2006
    10,163
    1,796
    Transformers are bi-directional. Secondaries in parallel will not sum voltages, but they might sum currents depending on the phases.

    What actually did happen?
     
  3. #12

    Expert

    Nov 30, 2010
    16,343
    6,828
    Have you checked the building for surge suppressors?
    and yes, the low impedance of the power line transformer is swallowing your energy.
    you need to insert an impedance in the AC-H before it goes into the line between "step-up" and "load".
     
  4. Highlight

    Thread Starter New Member

    Nov 26, 2010
    28
    0
    I put an o-scope at the load and just saw the 115VAC mains w/ no spike. When i removed the 115VAC at the secondary windings and switched the relay i did see a large spike. I think the 115vac at the secondary is killing the spike somehow.
     
  5. Highlight

    Thread Starter New Member

    Nov 26, 2010
    28
    0
    Would a .1uf capacitor be enough?..That would give me 26.5Kohms impedance at 60Hz.
     
  6. #12

    Expert

    Nov 30, 2010
    16,343
    6,828
    I am seriously at a loss as to the magnitude of currents you are working with. (The first drawing can be interpreted in the milliohm range.) The size of the capacitor depends on the load. Will the load still operate with the current of the power line limited to a couple of milliamps? You (we) need some labels!
     
Loading...