Multiple shielding techniques employed reduce the inter winding capacitance to below 0.005 Pico farad and increase D.C Isolation to over 1000 Megohms.
Technically, any transformers that have no direct current path between it's primary & secondary windings provides Isolation other commonly used,
Transformers even if they have separate primary & secondary winding are intended to convert the input voltage to a more useful level & do very little to attenuate the passage of noise or transients from primary to secondary. Even through both are separately wound transformers, they are substantially different w.r.t construction, specification & performance characteristics.
In shielded transformer, Four Low impedance path exists for nosies to pass to secondary & vise versa. :
- The High Value of Coupling Capacitance.
- The Maximum Linkage of Magnetic Field.
- The Leakage Current.
- Static transformer of Electric Nosies.




