That&#x27;s not a random failure, though.  The quality control for the transformer manufacturing was inadequate.  This wasn&#x27;t some difficult to anticipate error, either; maintaining the integrity of the winding insulation is basically the most important thing to monitor.  The machines were either poorly designed or improperly operated.<p>Sourcing higher quality components would prevent such issues.  I&#x27;ll concede that nothing can be perfect, but this type of error is preventable.  It starts to cost quite a bit when you move from 0.1% error to 0.01%, though.