Minute Arcing Between Primary and Secondary Windings

The sparking occurs between the Voltage source leads and the windings,and not between primary and secondary conductors,

Is this type of testing detrmental for transformer life, Since the operating freq is 10 Khz and we test it at 50 Hz,

No, it is not detrimental to the windings as long as you limit the length of time the test voltage is applied.

If you leave the test voltage applied for too long the windings will heat up and can cause insulation damage.

If you are going to be using this test method for initial screening of the equipment I suggest you install a correctly sized position maintained switch in the test voltage leads so that the arcing does not occur.

This type of test is ok for an initial safety "go-no go" check for shorted and grounded windings but does not properly test the transformer for performance and quality.

The transformers should be tested using a Turn-to-Turn Ratio (TTR) test set, an Impedance test set, and an AC or DC Hypot test set.

If you are not extremely familiar and competent with transformer testing I suggest you hire an outside competent testing facility/group to do the testing and observe the procedure very carefully.

Good luck and stay safe!

Reread his posts, the transformer runs at 10kHz, and he was testing it at a 240V with a 60W incandescent bulb in series with the windings, which effectively limits the current to 0.25A. As long as his windings are larger than 28 AWG he shouldn't have a problem pushing 0.25A through them, even at 10kHz.

Without knowing much about the construction or use of his specialty transformer we can safely say that he's not going to "smoke" anything unless there's some type of resonance phenomena at the test or operational frequency.

Thank you Sir,

Sir, Thank you very much for the advice.

What's the definition of a capacitor, parallel conductors separated by a dielectric/insulator? Assuming that the bulb doesn't light, you're simply providing a path for discharging all the distributed capacitance of the windings.

Thank you Sir for your reply,

Does this harm the transformer, since it is operating @ 10 Khz and we are testing on 50 hz , 240 V supply,

Pl. elaborate,

completed manufacturing prototype