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ers.com - What is an isolation transformer http://wiki.answers.com/Q/What_is_an_isolation_tra

1/29/2011



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Answers.com > Wiki Answers > Categories > Technology > Engineering > Electronics

Engineering > What is an isolation transformer?

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An isolation transformer does not have a direct electrical path from the power input side to the

power output side. The term is also used to define how much electrical isolation exists

between the input and output windings. For example when using line-voltage inputtransformers to power low voltage device handled by humans, a high degree of isolation is

required for safety.

Isolated transformers often use separate bobbins for the primary and secondary coil windings,

but usually the windings are just wound on top of each other with insulation in between.There

is usually an electrostatic shield between windings which is tied to transformer case.

Non-Isolated transformers are becoming rare. A common example is the "Variac" which is a

non-isolated variable

transformer. Usually the term "auto-

transformer" is used to describe

non-isolated transformers. They are rarely found in consumer products.

Although any transformer with a separate primary and secondary winding is an isolation transformer to some extent,

The term is usually used to denote a special-purpose transformer built just for that use. It is tested and rated to

withstand a very high voltage difference, called the withstand voltage, so that even if thousands of volts are applied tothe primary, it will not leak through to the protected side. These transformers are used in the medical industry, to

protect patients hooked up to monitoring instruments that are powered by utility mains, as well as other uses.

Note: There are comments associated with this question. See the discussion page to add to the conversation.

First answer by Eric M Jones. Last edit by Gregs11. Contributor trust: 3 [recommend contributor]. Question popularity:

29 [recommend question].

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1/29/2011



What is galvanic isolation transformer?

your nan

What is the purpose of isolation transformer?

An isolation transformer (or more commonly, amplifier) reduces noise in the system from the power source.

This is especially necessary in medical applications where the signals that are being read...

What is the use of isolation transformer in UPS?

It will segregrate the Battery unit and power supply unit,seperate.----Arun

How is a isolation transformer constructed?

It is made of two windings which are separated by very good insulation and also may be separated by a faraday

shield.

Difference between isolation transformer and ferromagnetic transformer?

An isolation transformer is usually a ferromagnetic transformer. The question needs to be framed more usefully.

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