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In the particular context here (which although not stated certainly appears to be discussing aspects of power generation management) a 'tap' has a very specific technical meaning: it refers to the 'prise' on a transformer (or some other dveices) that enable the electricity producer to adjust e.g. voltages, cos φ correction, etc.

Please note this is totally different from the lay term 'prise (de courant)' referring to a power socket outlet!

The sense of a 'tap' here is of course that of a 'take-off point', which is thus perfectly consistent with the notion of 'prise'.

Please see previous KudoZ entries about 'tap' as used in the specific engineering field.

Note that we often talk about 'tap switching' = 'commutation de prises'; here, I think 'sélection' is appropriate, as:
1) the 'setting' simple means 'which tap is selected', and
2) on any given device, out of the range of taps available, only one will ever be selected at a time — the plurality of 'settings' simply comes from the fact that this may of course be on several different pieces of equipment.

Although one might say 'réglage des prises', that sounds awkward to me, since the only way in which they can be 'adjusted' is by 'selecting a different one' — they are not per se individually 'adjustable' in any other way.


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Note added at 1 day 4 hrs (2018-08-31 17:26:04 GMT)
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'to tap' in EN has many singifications, the one closest here is what would be 'piquage', for example in FR; however, in this specialist field, where we are talking a botu a special kind oif 'tap' (note: noun) on a specific category of equipment, the dedicated terms used is 'prise'.

See plenty of refs. on sources such as GDT, Termium, etc., e.g.
http://www.granddictionnaire.com/ficheOqlf.aspx?Id_Fiche=449...

'tap changer' — from the nec plus ultra authoritative IEC, no less — note that in this older reference, they refer to it as a 'prise de réglage' — nowadays, the 'de réglage' is pretty much taken as implicit and needn't be stated, but does rather tend to justify not using 'réglages' here.

As I have stated above, the point is that you don't really 'régler' a 'prise' — it is simply selected; it's not like some kind of knob you turn. In that context, the 'setting' really means 'the position it is set to' — out of a fairl small number of discrete options.


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Note added at 1 day 7 hrs (2018-08-31 20:58:01 GMT)
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A piece of equipment will have several 'taps, only one of which can usually be selected at a time; so each piece of equipment has a tap set to one position' — i.e. a 'tap setting'; however, this document is talking in global terms, where there may well be many pieces of equipment, each of which has taps, to which one connection will be made — hence how we arrive at having several 'settings for the single tap on several pieces of equipment.

I repeat, a 'tap' cannot be adjusted — the only 'adjustment' taking place is which tap you select; it's ust like the manual gearbox (stick shift) on your car: you 'set' the gear ratio by selecting one of the fixed ratios that have been provided by the manufacturer (= the taps) — but I don't think we'd ever talk about 'adjusting the gear in your car'? We might use the accelerator to 'régler' the engine speed to 2000 rpm; but we would 'select' the right gear to achieve the appropriate drive ratio.

That is a very good analogy, and one that I hope everyone will be able to relate to easily.

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Note added at 1 day 18 hrs (2018-09-01 07:27:23 GMT)
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The 'monitored data' Germaine refers toi is "Which number tap is connected?"

A tap number is one single item of data.

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Note added at 3 days 16 hrs (2018-09-03 05:59:54 GMT)
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Try looking at it another way: the 'taps' are in fact the 'settings' used to 'adjust' the 'transformer' (etc.) ê so if the source text had said 'transformer settings in terms of tap number', then it would certainly have been a 'réglage de transformateur par prise', for example.