Pratique du Shadowing: Comparing Low Voltage Vs. Medium Voltage Equipment on Solar Sites - Apprendre l'anglais à l'oral avec la vidéo
Création de la leçon...
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Let's work our way backwards from the interconnection point and compare some equipment.
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First off, we have our system disconnect, which is almost without exception required by utilities for any distributed generation project, with the possible exception of some small residential projects.
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For low voltage projects, we typically have a blade disconnect.
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For utility scale systems, especially overhead connected projects, we'll see what's called a GOAB or gang operated airbrake switch.
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Next up, we have fuses, which can be a really helpful item to have for blanket protection from the utility, which often has a high available fault current.
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For low voltage projects, we typically have a fuse disconnect.
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For utility scale systems, especially overhead connected projects, we might see a set of three fuse cutouts.
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The next protective device might be a main circuit breaker, which can provide a bit more sensitive protection features than a fuse
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and could also be connected to a shunt trip circuit to be opened by a remote input.
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For medium voltage systems, a recloser sort of takes the place of a main circuit breaker, but with a whole lot more bells and whistles.
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A pole-mounted recloser is separated into two sections, a switching unit at the top of the pole and a control relay, usually mounted at ground level.
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The relay senses what's happening in the switching unit
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and tells the switching unit to open or close according to the settings in the relay.
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Most low-voltage circuit breakers are not set up to trip on voltage or frequency, but this is a standard function of a recloser.
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In almost every PV system nowadays, you're going to have some kind of revenue metering.
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In the low-voltage world, this could be a CT cabinet like the one shown here.
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For overhead medium-voltage systems, you're likely to see a primary metering rack, though a good percentage of projects still meter each subarray at the low-voltage side,
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either in addition to or instead of at medium voltage.
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Transformers are not always used in commercial systems, but they're also not totally uncommon either,
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especially when you encounter a 208 volt service, but you want to use a 480 volt string inverters for rooftop stringing efficiencies.
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If they're used, they typically are dry type transformers, less than 300 kVA.
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One of the key differentiators of utility scale projects, in addition to being connected at medium voltage is that they use a step-up transformer,
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so you'll have one or more of these on every project. And lastly are inverters.
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While you might see a 120kW Ving inverter like this one here on a commercial project, utility-scale projects sometimes use single inverters that are 2MW or more
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and are often combined into skids of 4-6MW and paired with a transformer.
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Fortunately, however, solar modules are still solar modules.
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Kind of.
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Thank you.
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Vocabulaire et conseils d’expression pour cette leçon
Cette vidéo contient 28 phrases et 475 mots à répéter en shadowing. La partie parlée dure 2:42. Le locuteur parle à un rythme naturel d’environ 176 mots par minute, proche d’une conversation courante. Seuls 71 % des mots font partie des 3 000 mots les plus courants en anglais, le vocabulaire est donc exigeant.
Vocabulaire clé de cette vidéo
15 mots de la vidéo à retenir, avec leur prononciation et leur sens :
| Mot | Prononciation | Sens |
|---|---|---|
| voltage nom | /ˈvəʊltɪd͡ʒ/ | tension, voltage |
| utility nom | /juːˈtɪlɪti/ | utilité |
| connect verbe | /kəˈnɛkt/ | accoupler, connecter |
| fuse nom | /fjuːz/ | cordeau, mèche |
| overhead nom | /ˈəʊvəˌhɛd/ | frais généraux |
| breaker nom | /ˈbɹeɪkɚ/ | casseur |
| mount verbe | /maʊnt/ | monter, grimper |
| string nom | /stɹɪŋ/ | corde |
| exception nom | /əkˈsɛpʃən/ | exception |
| pole nom | /pəʊl/ | pôle |
| meter nom | /ˈmitəɹ/ | mètre, compteur |
| module nom | /ˈmɑd͡ʒul/ | module |
| percentage nom | /pə(ɹ)ˈsɛntɪd͡ʒ/ | pourcentage |
| sensitive adjectif | /ˈsɛn.sɪt.ɪv/ | sensible |
| compare verbe | /kəmˈpɛɚ/ | comparer |
Les verbes à particule que vous entendrez
| Mot | Sens |
|---|---|
| step up verbe | accroître, augmenter |
La grammaire de cette vidéo
Les structures que le locuteur utilise le plus, avec les mots exacts de la vidéo :
| Structure | Dans la vidéo |
|---|---|
| Voix passive be + participe passé — l’accent est mis sur ce qui arrive, pas sur qui le fait | be connected · is separated · are not set |
| Propositions relatives who / which + proposition — une précision sur une personne ou une chose | disconnect, which is · fuses, which can · breaker, which can |
Prononciation à surveiller
Le locuteur utilise 6 contractions et formes réduites, comme they're, you're, we'll. Prononcez-les sous leur forme courte, telles que vous les entendez.
- Les sons « sh » et « zh »: exception /əkˈsɛpʃən/, efficiency /ɪˈfɪʃ.ən.si/, residential /ˌrɛzɪˈdɛnʃəl/, differentiator /dɪf.əˈɹɛn.ʃi.eɪ.tə/, interconnection /ˌɪn.tɚ.kəˈnɛk.ʃən/
- Mots longs — placez bien l’accent: utility /juːˈtɪlɪti/, efficiency /ɪˈfɪʃ.ən.si/, residential /ˌrɛzɪˈdɛnʃəl/, fortunately /ˈfɔɹ.t͡ʃə.nɪt.li/, differentiator /dɪf.əˈɹɛn.ʃi.eɪ.tə/
Comment s’entraîner avec cette vidéo
- Écoutez la vidéo en entier une fois sans parler et notez les mots que vous ne connaissez pas.
- Commencez à la vitesse 0,75×, répétez phrase par phrase, puis revenez à la vitesse normale quand cela devient facile.
- Enregistrez-vous et comparez avec l’original, en faisant attention à des mots comme voltage, utility, connect.
Qu'est-ce que la technique du Shadowing ?
Le Shadowing est une technique d'apprentissage des langues fondée sur la science, développée à l'origine pour la formation des interprètes professionnels. Le principe est simple mais puissant : vous écoutez de l'anglais natif et le répétez immédiatement à voix haute — comme une ombre suivant le locuteur avec un décalage de 1 à 2 secondes. Les recherches montrent une amélioration significative de la précision de la prononciation, de l'intonation, du rythme, des liaisons, de la compréhension orale et de la fluidité.