# Is the transformer leakage inductance increasing or decreasing VS. size

I have built an sine filter for a small inverter that feeds a transformer 250VA. The filter is basically a LC filter, that uses leakage inductance of the transformer with a capacitor connected in parallel to the secondary with a small value damping resistor.

I did use the function generator and scope to tune the resonating frequency so that is below switching frequency of the inverter and higher than highest possible fundamental output frequency. But this was tight tune: $$\F_{SW}=8kHz, \ \ F_{OUT_{max}}=400Hz\$$

Now they simply changed the inverter and the transformer with more powerful one. Now I would like to ask what should I expect:

• the leakage inductance has increased, since the transformer is bigger?
• the leakage inductance has decreased? Logical assumption is that big transformer has very low leakage inductance, compared to small one, because otherwise they would fail to supply the powerline.

simulate this circuit – Schematic created using CircuitLab

• For the same voltage ratings, I would expect a bigger transformer to have a smaller leakage inductance. Dec 6 '19 at 8:20