Measurement of Leakage reactance using resonant??

Discussion in 'General Electronics Chat' started by micktosin, May 16, 2014.

  1. micktosin

    micktosin Thread Starter New Member

    Mar 20, 2012
    Please how can I measure leakage reactance of a transformer using resoance? With C-=1.4uF, Leakage inductance= 20uH, magnetizing inductance=100uH, Switching frequency 30kHz, Turn ratio 9:3.

    P.s I have been trying to research on it, but no luck.
    Last edited: May 16, 2014
  2. crutschow

    crutschow AAC Fanatic!

    Mar 14, 2008
    L.A. USA
    If you short the transformer secondary, than any remaining reactance is due to the leakage inductance, stray winding capacitance, and the primary and secondary winding resistance. So if you determine the primary resonant frequency with the output shorted, you should be able to calculate the leakage inductance from that. This may help.
  3. studiot

    studiot E-book Developer

    Nov 9, 2007
    Somerset UK
    crutschow is correct.

    Here is the measurement procedure. You need three meters, current, voltage and power.

    Refer to the attachment.

    Short one winding and apply a low voltage to the other, increasing it until the rated current in that winding is achieved.

    At this point the equivalent circuit is as shown and the effective resistance, power angle, and leakage reactance can be calculated from the readings.

    Attached Files:

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