Shadowing Practice: Comparing Low Voltage Vs. Medium Voltage Equipment on Solar Sites - Learn English Speaking with Video
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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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Vocabulario y notas de pronunciación para esta lección
Este vídeo tiene 28 frases y 475 palabras para practicar shadowing. La parte hablada dura 2:42. El hablante habla a un ritmo natural de unas 176 palabras por minuto, cercano a una conversación cotidiana. Solo el 71 % de las palabras está entre las 3.000 más comunes del inglés, por lo que el vocabulario es exigente.
Vocabulario clave de este vídeo
15 palabras del vídeo que vale la pena aprender, con su pronunciación y significado:
| Palabra | Pronunciación | Significado |
|---|---|---|
| voltage sustantivo | /ˈvəʊltɪd͡ʒ/ | voltaje, tensión |
| utility sustantivo | /juːˈtɪlɪti/ | utilidad |
| connect verbo | /kəˈnɛkt/ | conectar, empalmar |
| fuse sustantivo | /fjuːz/ | mecha |
| overhead sustantivo | /ˈəʊvəˌhɛd/ | gastos generales |
| mount verbo | /maʊnt/ | montar, cabalgar |
| string sustantivo | /stɹɪŋ/ | cuerda, mecate ("cordel" or "cuerda") |
| exception sustantivo | /əkˈsɛpʃən/ | excepción, salvedad |
| pole sustantivo | /pəʊl/ | polo |
| meter sustantivo | /ˈmitəɹ/ | medidor, contador |
| module sustantivo | /ˈmɑd͡ʒul/ | módulo |
| percentage sustantivo | /pə(ɹ)ˈsɛntɪd͡ʒ/ | porcentaje |
| sensitive adjetivo | /ˈsɛn.sɪt.ɪv/ | sensible |
| compare verbo | /kəmˈpɛɚ/ | comparar, parangonar |
| helpful adjetivo | /ˈhɛlp.fl̩/ | servicial, adyuvante |
Phrasal verbs que vas a escuchar
| Palabra | Significado |
|---|---|
| step up verbo | aumentar, redoblar |
Gramática en este vídeo
Las estructuras que más usa el hablante, con las palabras exactas del vídeo:
| Estructura | En el vídeo |
|---|---|
| Voz pasiva be + participio pasado — importa lo que ocurre, no quién lo hace | be connected · is separated · are not set |
| Oraciones de relativo who / which + oración — información extra sobre una persona o cosa | disconnect, which is · fuses, which can · breaker, which can |
Pronunciación a tener en cuenta
El hablante usa 6 contracciones y formas reducidas, como they're, you're, we'll. Dilas en su forma corta, tal como las oyes.
- Los sonidos de “sh” y “zh”: exception /əkˈsɛpʃən/, efficiency /ɪˈfɪʃ.ən.si/, residential /ˌrɛzɪˈdɛnʃəl/, differentiator /dɪf.əˈɹɛn.ʃi.eɪ.tə/, interconnection /ˌɪn.tɚ.kəˈnɛk.ʃən/
- Palabras largas — cuida el acento: utility /juːˈtɪlɪti/, efficiency /ɪˈfɪʃ.ən.si/, residential /ˌrɛzɪˈdɛnʃəl/, fortunately /ˈfɔɹ.t͡ʃə.nɪt.li/, differentiator /dɪf.əˈɹɛn.ʃi.eɪ.tə/
Cómo practicar con este vídeo
- Escucha el vídeo entero una vez sin hablar y anota las palabras que no conoces.
- Empieza a velocidad 0,75×, haz shadowing frase por frase y vuelve a la velocidad normal cuando te resulte fácil.
- Grábate y compara con el original, prestando atención a palabras como voltage, utility, connect.
¿Qué es la Técnica de Shadowing?
Shadowing es una técnica de aprendizaje de idiomas respaldada por la ciencia, desarrollada originalmente para la formación de intérpretes profesionales y popularizada por el políglota Dr. Alexander Arguelles. El método es simple pero poderoso: escuchas audio en inglés nativo y lo repites en voz alta de inmediato, como una sombra que sigue al hablante con solo 1-2 segundos de retraso. A diferencia de la escucha pasiva o los ejercicios de gramática, el shadowing obliga a tu cerebro y músculos de la boca a procesar y reproducir simultáneamente patrones de habla reales. Las investigaciones muestran que mejora significativamente la precisión de la pronunciación, la entonación, el ritmo, el habla conectada, la comprensión auditiva y la fluidez al hablar, convirtiéndola en una de las metodologías más efectivas para la preparación del IELTS Speaking y la comunicación en inglés en el mundo real.