Talk:Per-unit system

I added and explained algebraic proofs on why Voltage and Current per unit are the same on both sides of an ideal transformer. I added these proofs to the beginning of the transformer section of this per-unit system page. - elinxie — Preceding unsigned comment added by elinxie (talk • contribs) 06:53, 8 December 2016 (UTC)

I added some text and an example to the transformer section as I believe that it is important to talk about some of the conventions and show how they work within this section, even though it was already mentioned above. I also added a formula to change one per unit impedance to another per unit impedance at another set base values. - mguttenberg — Preceding unsigned comment added by Mguttenberg (talk • contribs) 06:53, 8 December 2016 (UTC)

This is wrong, but I'm too busy to fix it now.

$I_{base}={\frac {P_{base}}{V_{base}}}=1pu$

$Z_{base}={\frac {V_{base}}{I_{base}}}=1pu$

$Y_{base}={\frac {1}{Z_{base}}}=1pu$

The example at the bottom is correct though so overall the article is fine. — Preceding unsigned comment added by 164.107.165.53 (talk • contribs)

14-Apr-2013: I followed the link for short circuit, but it took me to short circuit in a computer programming context, not a power systems context. I don't know how to fix this, but it would be great if someone could... — Preceding unsigned comment added by 216.52.185.71 (talk) 12:00, 14 April 2013 (UTC)

[1]  Done (Although, I couldn't find any article specifically about short-circuit evaluation in power systems, so I just linked it to short circuit) Dalba (talk) 11:37, 17 July 2015 (UTC)

I added a paragraph about the steps for calculating per-unit system into the original "purpose" column.Hsiu Wei Chang (talk) 05:42, 10 December 2015 (UTC)Hsiu-Wei

Apparati?!

In English, the plural of apparatus is apparatuses. If you must be pedantic and insist that it's a Latin word, then get it right. The plural is apparatus, not apparati. It's a fourth-declension noun, not second-declension masculine. See Latin 4th declension

I won't bother editing the article; it'll only get reversed.

109.157.82.217 (talk) 21:08, 5 June 2016 (UTC)

I seriously believe that one of the very first things to explain to anybody when talking about base impedance, with the label Zbase, is that it is a magnitude. And they need to define it right from the start what exactly is 'Zbase'. For example, is it SQRT(R^2+X^2)? To me, base impedance is one of the most poorly defined parameters (anywhere - not just in power engineering....but just anywhere). The textbooks and resources should all get their act together, and define things properly, and clearly. 09:09, 11 April 2017 (UTC)