All About Circuits Forum Measurement of Leakage reactance using resonant??
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#1
05-16-2014, 09:24 AM
 micktosin Junior Member Join Date: Mar 2012 Posts: 19
Measurement of Leakage reactance using resonant??

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 by micktosin; 05-16-2014 at 09:25 AM. Reason: To include a tag
#2
05-16-2014, 04:08 PM
 crutschow Senior Member Join Date: Mar 2008 Location: L.A. USA Posts: 6,291 Blog Entries: 1

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.
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#3
05-16-2014, 05:09 PM
 studiot E-book Developer Join Date: Nov 2007 Location: Somerset UK Posts: 3,951

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 Images
 leak1.jpg (25.9 KB, 2 views)
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