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Answer Posted / thowsif_emerson_csm team
Isolation transformer means that no direct electrical
connection exists between source and load. But that's true
for any transformer (other than an autotransformer). What
makes the drive isolation transformer different is the
placement of grounded electrostatic (Faraday) shielding
between and around primary and secondary windings. That
provides up to a million-fold decrease in the capacitive
coupling involved in transferring common-mode voltage
disturbance. Without such shielding, that capacitance
allows passage through the transformer of high-
frequency "noise" and transient voltage spikes.
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