Talk:Short-circuit inductance

another junk article

This is just a definition, nothing more. See WP:Dictionary. It must be merged somewhere else, deleted, or expanded into substantially more than a definition. But I'm afraid that a definition is all there is to this topic.

Definition?

Short-circuit inductance is written "=" as if were an assignment or definition. It is neither: short-circuit inductances are measured quantities. That such a quantity should have an incidental equality to something computed from open-circuit measurements is not established. The best we can say is any "k" computed from these measurements is k', and only approximately equal to k, computed from conventional transformer inductances. In any case, the equalities are rather meaningless, because k as reported in transformer specs isn't derived this way. The relationship of sc quantities to other qualtities is usually represented this way (substituting sigma for it's definition (1-k^2):

$\sigma ={\frac {L_{\mathrm {sc1} }}{L_{\mathrm {1} }}}$

$\sigma ={\frac {L_{\mathrm {sc2} }}{L_{\mathrm {2} }}}$

No justification in terms of a model is given for the validty of these measurements and their relation to k (~sigma). It is also not defined whether the quantities L₁ and L₂ are obtained from a spec sheet, measured (how?), or computed from other known or measured transformer inductances. They are in usage undefined, though we are told in semantic terms what they represent. Consider what you'd do in a laboratory: you've got the sc measurements, go back to the formula and look around - what are L1 and L2?

Sbalfour (talk) 19:02, 4 December 2017 (UTC)

short-circuiting a transformer - measurement or meltdown?

This article is about measuring a real transformer or some approximation of one (because ideal transformers don't have leakage inductance to measure). I pity some poor propeller-head who drops a shunt across a big transformer and plugs it in - the result won't be pretty. How this measurement is actually done is completely hidden. WP is not a lab manual, but there are both practical and theoretic aspects to this that could be covered reasonably in a scholarly article. The person who created this page wanted a feather in his cap, and never set foot in a laboratory. There's no scholarly content at all here. Sbalfour (talk) 18:15, 6 December 2017 (UTC)