First, in these sort of contexts, 'courant' is often best translated as 'power' (and cf. some recent KudoZ questions;...)

Second, power is described as 'technical' when it is being used to feed technical equipment; in these sort of TV mobile applications it is very important to segregate 'technical', 'domestic' (lighting, heating, etc.) and sometimes 'auxiliary OR services' power, to avoid unwanted interactions / interferenece, and sometimes for load-sharing reasons.

Third, 'secondary' might mean 2 things, but either way it won't change the translation; it might refer to some kind of 'secondary' supply, or it might refer to the current flowing in the 'secondary' winding of a transformer.

Note that those 'transformateurs d'intensité' are current transformers, and that by definition, they measure the CURRENT being consumed; but there is still no reason why you can't translate the 'courant' as power here, since clearly this power can be readily deduced from the current! It's just a slight differnece between the way we look at things in FR / EN, is all.


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Note added at 5 hrs 53 mins (2005-07-17 08:07:54 GMT)
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\"Three current transformers for measuring secondary technical power\"

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Note added at 12 hrs 15 mins (2005-07-17 14:29:42 GMT) Post-grading
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This question of \'courant\' is always a thorny one; in everyday, colloquial French, the term is used almost exactly synonymously with the way we in English would say \'(electric) power\' or simply \'electricity\' --- \"we didn\'t get the \'courant\' in our village till 1956\"

In more technical usage, it is very often used in the same sort of way, i.e. to describe electrical power IN GENERAL, rather than specifically the technical characteristic of power (= puissance, measured in watts or kilowatss, for example). In this sense, the word \'energie\' is also often used virtually synonymously.

The technical sense of current is more often rendered in French by \'intensité\' (as it once would have been in English too), and indeed, the internationally-recognized symbol for current (in this physical sense) is I.

So in some ways, \'courant\' in an electrical context might be regarded as something of a \'faux ami\', with the issue being clouded by the fact that we sometimes also use \'current\' (or even more colloquially \'juice\') inaccurately like this in English too!

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Note added at 344 days (2006-06-26 07:33:41 GMT) Post-grading
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Bealted apologies for the typos above — must have been having a 'bad typing' day (when don't I?)

Of course:

interference
difference
kilowatts

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Note added at 344 days (2006-06-26 07:39:53 GMT) Post-grading
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Oh dear! And I introduced another one with 'belated' :-((