Answer / vasudevan

An isolation transformer is used to isolate the primary and
secondary circuits.To protect the source equipment from any
voltage or earth fault in the load circuit.this transformer
mostly used in induction loads

Answer / mahesh unni

An isolation transformer is a transformer used to transfer
electrical power from a source of alternating current (AC)
power to some equipment or device while isolating the
powered device from the power source, usually for safety.
Isolation transformers provide galvanic isolation and are
used to protect against electric shock, to suppress
electrical noise in sensitive devices, or to transfer power
between two circuits which must not be connected. Isolation
transformers block transmission of DC signals from one
circuit to the other, but allow AC signals to pass.

For more information check:
http://en.wikipedia.org/wiki/Isolation_transformer

Answer / guest

An isolation transformer is a transformer used to transfer
electrical power from a source of alternating current (AC)
power to some equipment or device

Hi friends, from Aug 4th onwards iam getting spikes for analog inputs in our DCS for a period of 800ms. I throughly checked every thing, finally i found that the DI, DO's from MCC panels shields are terminated in the Signal Earth where Analog Input signals shields are terminated. Is there any problem with this type of termination?. i checked the induction voltage from MCC and getting around 25VAC, please suggest me in this concern. Our plant is 8months old only. DCS is Siemens Make Simatic PCS7, and the transmitters are Yokogawa make.

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