Thanks a lot. Explain the ground isolation benefit of using transformers. Why is

Question

Thanks a lot.

Explain the ground isolation benefit of using transformers. Why is there a difference between the transformer ratios with a load connected and without a load connected? If a manufacturer describes a power supply transformer as providing a secondary voltage of 24V when connected to a 120V main supply, are they referring to the full load or no load secondary voltage? Assume the voltage across the primary is measured to be 125V DC and the turns ratio is 10. Calculate the secondary voltage with no load, and then with a 1k Ohm load. Is there a difference?

Explanation / Answer

Q4; There will be no difference because of transformer doesn't operate

on DC voltages. so how much load is connected doesn't matter. there will

be no voltage drope in winding because of no current flowing.

Transformer doesn't work on DC supply. it is only for AC supply.

Q3; Manufacturer always place a "name plate" where transformer data are

mention on that. and all readings are purely for no load conditions.

Q2; The ratio mention by Manufacturer at "no load". when load is connected

so there is some volatage drop in the winding (because of many reasons,

1. due to copper losses,). so always No-load voltage differ from on-load

voltage. similarly ratio differ.

beacuse of ratio is = Vp/Vs

Q1; yup .. Isolation transformers remove DC components from signals

and can also help with "ground loop" problems. For example, at HIPAS observatory,

we had several widely scattered buildings, each fed with different legs of the commerciall

power distribuition system. There were large differential voltages between the different

buildings, which made transferring low level signals between them a real nightmare,

as you can imagine. We used a vast array of video, audio, and pulse isolation transformers

to eliminate these problems.

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