Shadowing Practice: Comparing Low Voltage Vs. Medium Voltage Equipment on Solar Sites - Learn English Speaking with Video
Les maken...
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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.
4
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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Woordenschat en spreektips bij deze les
Deze video bevat 28 zinnen en 475 woorden om na te spreken. Het gesproken deel duurt 2:42. De spreker praat in een natuurlijk tempo van ongeveer 176 woorden per minuut, dicht bij een alledaags gesprek. Slechts 71% van de woorden hoort bij de 3.000 meest gebruikte Engelse woorden, dus de woordenschat is pittig.
Belangrijke woorden in deze video
15 woorden uit de video die het leren waard zijn, met uitspraak en betekenis:
| Woord | Uitspraak | Betekenis |
|---|---|---|
| voltage zelfstandig naamwoord | /ˈvəʊltɪd͡ʒ/ | spanning |
| utility zelfstandig naamwoord | /juːˈtɪlɪti/ | bruikbaarheid, handigheid |
| connect werkwoord | /kəˈnɛkt/ | verbinden |
| fuse zelfstandig naamwoord | /fjuːz/ | lont |
| mount werkwoord | /maʊnt/ | beklimmen |
| string zelfstandig naamwoord | /stɹɪŋ/ | draad, koord |
| exception zelfstandig naamwoord | /əkˈsɛpʃən/ | uitzondering |
| pole zelfstandig naamwoord | /pəʊl/ | pool |
| meter zelfstandig naamwoord | /ˈmitəɹ/ | meter, teller |
| module zelfstandig naamwoord | /ˈmɑd͡ʒul/ | module |
| percentage zelfstandig naamwoord | /pə(ɹ)ˈsɛntɪd͡ʒ/ | percentage |
| sensitive bijvoeglijk naamwoord | /ˈsɛn.sɪt.ɪv/ | gevoelig, prikkelbaar |
| compare werkwoord | /kəmˈpɛɚ/ | vergelijken |
| helpful bijvoeglijk naamwoord | /ˈhɛlp.fl̩/ | behulpzaam |
| remote bijvoeglijk naamwoord | /ɹəˈməʊt̞/ | verwijderd, afgelegen |
Phrasal verbs die je zult horen
| Woord | Betekenis |
|---|---|
| step up werkwoord | versnellen, verhogen |
Grammatica in deze video
De structuren die de spreker het meest gebruikt, met de exacte woorden uit de video:
| Structuur | In de video |
|---|---|
| Lijdende vorm be + voltooid deelwoord — het gaat om wat er gebeurt, niet om wie het doet | be connected · is separated · are not set |
| Betrekkelijke bijzinnen who / which + zin — extra informatie over een persoon of ding | disconnect, which is · fuses, which can · breaker, which can |
Uitspraak om op te letten
De spreker gebruikt 6 samentrekkingen en verkorte vormen, zoals they're, you're, we'll. Spreek ze kort uit, zoals je ze hoort.
- De klanken “sh” en “zh”: exception /əkˈsɛpʃən/, efficiency /ɪˈfɪʃ.ən.si/, residential /ˌrɛzɪˈdɛnʃəl/, differentiator /dɪf.əˈɹɛn.ʃi.eɪ.tə/, interconnection /ˌɪn.tɚ.kəˈnɛk.ʃən/
- Lange woorden — let op de klemtoon: utility /juːˈtɪlɪti/, efficiency /ɪˈfɪʃ.ən.si/, residential /ˌrɛzɪˈdɛnʃəl/, fortunately /ˈfɔɹ.t͡ʃə.nɪt.li/, differentiator /dɪf.əˈɹɛn.ʃi.eɪ.tə/
Zo oefen je met deze video
- Luister de hele video één keer zonder te spreken en noteer de woorden die je niet kent.
- Begin op 0,75× snelheid, spreek zin voor zin na en ga terug naar normale snelheid zodra het makkelijk gaat.
- Neem jezelf op en vergelijk met het origineel; let daarbij op woorden als voltage, utility, connect.
Wat is de Shadowing-techniek?
Shadowing is een wetenschappelijk onderbouwde taalleermethode die oorspronkelijk is ontwikkeld voor professionele tolkentraining en gepopulariseerd door polyglot Dr. Alexander Arguelles. De methode is eenvoudig maar krachtig: je luistert naar native Engelse audio en herhaalt het onmiddellijk hardop — als een schaduw die de spreker volgt met slechts 1–2 seconden vertraging. In tegenstelling tot passief luisteren of grammaticadrills, dwingt shadowing je hersenen en mondspieren om echte spraakpatronen tegelijkertijd te verwerken en te reproduceren. Onderzoek toont aan dat het de uitspraaknauwkeurigheid, intonatie, ritme, verbonden spraak, luisterbegrip en spreekvaardigheid aanzienlijk verbetert — waardoor het een van de meest effectieve methoden is voor IELTS Speaking-voorbereiding en echte Engelse communicatie.