From Transformers Wiki. Transformers AtoZ is a series of profiles that was serialised in the The Transformers UK comics by Marvel Comics between 1987 and 1989 which followed on from the previous series of Fact File Interfaces.
http://tfwiki.net/wiki/Transformers_AtoZ
A varying current in the transformer's primary winding creates a varying magnetic flux in the core and a varying magnetic field impinging on the secondary winding. This varying magnetic field at the secondary induces a varying electromotive force (EMF) or voltage in the secondary winding.
https://en.wikipedia.org/wiki/Transformer
RE: Transformer %Z and X/R. I don't know %Z and X/R are controlled during design and manufacture of a transformer, but any good power system analysis text book will explain the open circuit and short circuit tests necessary to calculate both.
http://www.eng-tips.com/viewthread.cfm?qid=147658
Since the invention of the first constant potential transformer in 1885, transformers have become essential for the transmission, distribution, and utilization of alternating current electrical energy. A wide range of transformer designs is encountered in electronic and electric power applications.
https://en.wikipedia.org/wiki/Transformer
A varying current in the transformer's primary winding creates a varying magnetic flux in the transformer core and a varying field impinging on the transformer's secondary winding.
https://en.wikipedia.org/wiki/Transformer
The no-load loss can be significant, so that even an idle transformer constitutes a drain on the electrical supply. Designing energy efficient transformers for lower loss requires a larger core, good-quality silicon steel, or even amorphous steel for the core and thicker wire, increasing initial cost.
https://en.wikipedia.org/wiki/Transformer
Step 2. Find the transformer multiplier. See Notes 1 and 2. * Note 1.Get %Z from nameplate or Table 1. Transformer impedance (Z) helps to. determine what the short circuit current will be at the transformer secondary. Transformer impedance is determined as follows: The transformer secondary is short. circuited. Voltage is increased on the primary until full load current flows in the. secondary. This applied voltage divided by the rated primary voltage (times 100) is the. impedance of the transformer.
http://www.cooperindustries.com/content/dam/public/bussmann/Electrical/Resources/solution-center/technical_library/BUS_Ele_Tech_Lib_Electrical_Formulas.pdf
RE: Transformer %Z and X/R. A question for DPC... I am trying to confirm a reactive loss in a load flow calculation for a GSU transformer. I multiplied the line current squared by the reactive ohms. I got the reactive ohms by multiplying the impedance base ohms by the %X.
http://www.eng-tips.com/viewthread.cfm?qid=147658
A transformer is an electrical device that transfers electrical energy between two or more circuits through electromagnetic induction. Electromagnetic induction produces an electromotive force within a conductor which is exposed to time varying magnetic fields.
https://en.wikipedia.org/wiki/Transformer
RE: Transformer %Z and X/R. The X/R ratio can be determined if you know the impedance voltage and the losses. Since the full-load losses include both the resistance losses and the iron losses, you subtract the no-load losses from the total losses. The %resistance is 100 * (Full load loss -no load loss)/transformer rating. Once you know the %R, you can use the %Z derived from the impedance voltage test to determine the %X and the X/R ratio.
http://www.eng-tips.com/viewthread.cfm?qid=147658
what is z on transformers
On a transformer, Z is the impedance that helps to determine what the short circuit current will be at the transformer secondary.