What is leakage inductance?

Leakage Inductance

Leakage inductance is the property of an electrical transformer that causes a winding to appear to have some inductance in series with the mutually-coupled transformer windings. This is due to imperfect coupling of the windings and creation of leakage flux which does not link with all the turns of the winding.

Read more about Leakage Inductance.

Some articles on leakage inductance:

Transformers (electrical) - Basic Transformer Parameters and Construction - Leakage Flux
... Such flux is termed leakage flux, and results in leakage inductance in series with the mutually coupled transformer windings ... Leakage flux results in energy being alternately stored in and discharged from the magnetic fields with each cycle of the power supply ... are therefore normally designed to have very low leakage inductance ...
CCFL Inverter - History of The Technology
... closed magnetic circuit type transformer having a small leakage inductance was used as a step-up transformer ... The leakage inductance was such that it reduced the output voltage on the secondary side of the transformer ... A step-up transformer with a greater leakage inductance value is suitable for use in this case ...
Leakage Inductance - Further Reading
... Texas Instruments Magnetics Design Handbook covers leakage inductance, its causes and effects as well as how to design it out of a transformer ...
Tesla Coil - Practical Aspects of Design - High Voltage Production
... that self-limits its secondary current by means of internal leakage inductance ... A normal (low leakage inductance) high-voltage transformer must use an external limiter (sometimes called a ballast) to limit current ... NSTs are designed to have high leakage inductance to limit their short circuit current to a safe level ...