Such flux is termed " leakage flux ", and results in leakage inductance in series with the mutually coupled transformer windings.
12.
The transformer may also have significant leakage inductance for short circuit protection in the event of a welding rod becoming stuck to the workpiece.
13.
A normal ( low leakage inductance ) high-voltage transformer must use an external limiter ( sometimes called a ballast ) to limit current.
14.
Although discussed exclusively in relation to transformers in this article, leakage inductance applies to any imperfectly-coupled magnetic circuit device including especially motors.
15.
Regardless of which configuration is used, the HV transformer must be of a type that self-limits its secondary current by means of internal leakage inductance.
16.
To minimize distortion of the pulse shape, a pulse transformer needs to have low values of leakage inductance and distributed capacitance, and a high open-circuit inductance.
17.
In contrast, larger sized lamps often use a specially constructed high voltage transformer with high leakage inductance or other electrical ballast to limit the available current ( see neon sign ).
18.
The line transformer was designed to have higher than normal leakage inductance to tolerate the short circuit occurring while the gap remained ionized, or for the few milliseconds until the high frequency current had died away.
19.
A capacitor is placed across the points which absorbs the energy stored in the leakage inductance of the primary coil, and slows the rise time of the primary winding voltage to allow the points to open fully.
20.
Toroidal cores are used despite the high manufacturing costs ( a great deal of manual work ) due to the low magnetic flux leakage ( MFL Leakage inductance ), low core losses and the good power density.
