Isolation Transformer

What is Google? How is it manufactured, its use, its advantages?

Oops! I goofed up! I meant two winding transformers! Sorry! And, thanks for the correction!

An isolation transformer is usually a primary winding and a secondary winding that are the same gauge and number of turns so that the transformer does not change the voltage or the current. The usual purpose is to prevent the coupling of high frequency signals from the source to the drain or visa versa. It is manufactured in the same way as most other transformers of the same rated power.

Just to be more precise;

A simple isolation transformer will normally have two separate coils that are either wound together or interleave on top of one another, are electrically isolated or independent yet magnetically coupled. You are quite correct, The construction in its simplest form will only have one secondary and one primary wound coils.

But it can also have a multiple or several secondary windings depending on the intended application(s)! The size of the magnet wire(s) will determine the amperage capacity while terminal voltages for its coils will be determined by the turn ratio(s) and laminates (core) magnetization characteristics used in the design.

Generally the intended main purpose for having separate winding(s) and isolated coils for this type of transformer is for application and personal electrical safety!

From Wikipedia

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 the DC component in signals from one circuit to the other, but allow AC components in signals to pass.

Suitably designed isolation transformers block interference caused by ground loops. Isolation transformers with electrostatic shields are used for power supplies for sensitive equipment such as computers or laboratory instruments.

Strictly speaking any true transformer, whether used to transfer signals or power, is isolating, as the primary and secondary are not connected by conductors but only by induction. However, only transformers whose primary purpose is to isolate circuits are routinely described as isolation transformers. A transformer sold for isolation is often built with special insulation between primary and secondary, and is specified to withstand a high voltage between windings.

Sometimes the term is used to emphasize that a device is not an autotransformer whose primary and secondary circuits are connected. ^[1] Power transformers with specified insulation between primary and secondary are not usually described only as "isolation transformers" unless this is their primary function.

Some small transformers are used for isolation in pulse circuits. ^[1][2]

Isolation transformers are designed with attention to capacitive coupling between the two windings. The capacitance between primary and secondary windings would also couple AC current from the primary to the secondary. A grounded Faraday shield between the primary and the secondary greatly reduces the coupling of common-mode noise. This may be another winding or a metal strip surrounding a winding.

Differential noise can magnetically couple from the primary to the secondary of an isolation transformer, and must be filtered out if a problem.

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