transient voltage

Discussion in 'General Electronics Chat' started by vks_foe, Aug 18, 2013.

  1. vks_foe

    Thread Starter Active Member

    Jan 11, 2009
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    5
    Will there be any voltage spike in secondary windings of a POWER transformer if it is charged on no load (secondary wdgs open ckt)?
     
  2. MaxHeadRoom

    Expert

    Jul 18, 2013
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    Only if there are any on the primary?
    Max.
     
  3. vks_foe

    Thread Starter Active Member

    Jan 11, 2009
    55
    5
    i connected a digital multimeter to the 2ndary wdg with 380v o/p at rated input. Input was within limits. The meter blew off. Its range was much higher than 380V
     
  4. MaxHeadRoom

    Expert

    Jul 18, 2013
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    I have had occasion to measure many 60Hz transformer secondaries up to 600v 3ph and never seen that happen.
    Only if you have the meter on the Current range. ;)
    Max.
     
  5. crutschow

    Expert

    Mar 14, 2008
    12,981
    3,221
    A power transformer will have no spikes on the output when it is open circuit if it is being fed from normal mains voltage.
     
  6. MaxHeadRoom

    Expert

    Jul 18, 2013
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    There is some normal Inductance suppression effect by the transformer itself, depending on the frequency of the spike.
    But a power condition meter monitoring brown out conditions, also will show transient spikes that appear, but normally the are minimal, unless high energy equipment with S.S. switching is connected to the same supply.
    Max.
     
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