Prática de Shadowing: How Does Electricity Flow Through a Utility-Scale Solar Site? - Aprenda a falar inglês com vídeo
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I wanted to take the time to make sure you all totally understood the concept of electrical flow through the PV plant.
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The following slides show one specific setup in regards to power conversion and electrical flow.
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So, firstly, sunlight strikes the PV modules.
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The sunlight is converted into electricity within the PV module.
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And as we know from previous slides, the electricity that's generated is DC electricity, direct current.
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Modules are wired together in strings.
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Remember that a string is just the technical name for a group of modules all wired together in series.
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This string of PV modules is basically collecting all the electrical current.
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And all of this collected up electricity is then transported via
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a home run of DC cabling to a combiner box as shown.
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So you now have the electricity from multiple strings all feeding into a single combiner box, where additional electrical protection such as fuses will be located.
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The combiner box is pretty much doing exactly what it says, combining or consolidating all this electricity.
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There's a few obvious benefits here.
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The DC feeders are higher gauge cables, so they'll have reduced electrical losses.
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And since each of them can carry more current, there's simply less of them, which makes for easier management and less terminations once we get to the inverter stage.
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The DC electricity then needs to be transported from the combiner box to the next key component in line, the inverters, shown here.
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This is achieved using what are commonly known as DC feeders.
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There's a number of ways to do this, either an underground trenching or above ground cable trays.
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Once the DC electricity has been transferred to the inverter, the inverter does its job, which is to convert this DC electricity into AC electricity.
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Remember that the key reason we need to do this is
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that the electricity on the utility grid is all high voltage AC and we have to match that.
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So now we have AC electricity which has been produced by the inverters
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and we need to transport this electricity to the next step in the chain which is the transformer.
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Now we're at the transformer level, and the transformer's job is to step the voltage of the AC electricity up.
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The reason for this is that as we should remember back from our power and voltage slides much earlier in the presentation, and our discussion around Ohm's law,
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resistance equals voltage divided by current.
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Now remember that power can be calculated by multiplying voltage by current,
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but Ohm's states that voltage can also be expressed by current multiplied by resistance.
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This means that you can calculate power by squaring your current and multiplying it by the resistance.
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Since the resistance of the cabling from the transformer to the interconnect won't change, as that's a function of the material that's being used,
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to minimize the power losses in the system we want to minimize the current as much as possible.
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The only way to do that, again going back the Ohm's law is to increase the voltage.
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So step the voltage up, reduce the current required and reduce the power losses in the system.
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We then need to transport this AC electricity from the location of the transformer out to the point of interconnect.
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This is done via AC cabling and is commonly done via underground trenching.
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The point of interconnect, or POI, is simply where the power plant ties into the utility grid.
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Now, once you're at the point of interconnect, depending on the size of the plant or the transmission lines you're tying into,
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there may be another transformer to step the voltage up again to match what's on the existing lines
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so you can go from 34.5 kV up to 69 kV
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or even higher
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and there you have it you've then got high voltage ac electricity onto the utility lines
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so what started as sunlight hitting an individual pv module
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which created low voltage dc electricity has gone through all these various steps
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and conversions through home runs combiner boxes dc feeders inverters transformers ac cabling
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and is then connected into the utility lines as high voltage ac
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Vocabulário e dicas de fala para esta lição
Este vídeo tem 45 frases e 696 palavras para praticar shadowing. A fala dura 4:08. O falante fala em ritmo natural, cerca de 169 palavras por minuto, próximo de uma conversa do dia a dia. Apenas 77% das palavras estão entre as 3.000 mais comuns do inglês, por isso o vocabulário é exigente.
Vocabulário principal deste vídeo
15 palavras do vídeo que vale a pena aprender, com pronúncia e significado:
| Palavra | Pronúncia | Significado |
|---|---|---|
| electricity substantivo | /ɪˌlɛkˈtɹɪsɪti/ | eletricidade |
| voltage substantivo | /ˈvəʊltɪd͡ʒ/ | tensão, voltagem |
| module substantivo | /ˈmɑd͡ʒul/ | módulo |
| string substantivo | /stɹɪŋ/ | barbante, corda |
| utility substantivo | /juːˈtɪlɪti/ | utilidade |
| slide substantivo | /ˈslaɪ̯d/ | escorrega, escorregador |
| sunlight substantivo | /ˈsʌnˌlaɪt/ | luz do sol |
| wire substantivo | /ˈwaɪɚ/ | arame |
| commonly advérbio | /ˈkɑmənli/ | comumente |
| collect verbo | /ˈkɑlɪkt/ | juntar, reunir |
| underground adjetivo | /ˌʌn.dəɹˈɡɹaʊnd/ | subterrâneo |
| conversion substantivo | /kənˈvɝʒən/ | conversão |
| grid substantivo | /ɡɹɪd/ | matriz, quadriculado |
| convert verbo | /kənˈvɝt/ | converter, transformar |
| calculate verbo | /ˈkælkjʊleɪt/ | calcular |
Phrasal verbs que você vai ouvir
| Palavra | Significado |
|---|---|
| go back verbo | voltar |
Gramática neste vídeo
As estruturas que o falante mais usa, com as palavras exatas do vídeo:
| Estrutura | No vídeo |
|---|---|
| Voz passiva be + particípio passado — o foco está no que acontece, não em quem faz | is converted · are wired · will be located |
| Present perfect have/has + particípio passado — uma ação passada que ainda importa agora | have reduced · has been transferred · has been produced |
| Orações relativas who / which + oração — informação extra sobre uma pessoa ou coisa | them, which makes · job, which is · electricity which has |
Pronúncia para ficar de olho
O falante usa 6 contrações e formas reduzidas, como you're, they'll, we're. Diga-as na forma curta, do jeito que você ouve.
- Os sons de “sh” e “zh”: conversion /kənˈvɝʒən/, transmission /tɹænsˈmɪʃən/, presentation /ˌpɹɛzn̩ˈteɪʃn̩/, termination /tɚmɪˈneɪʃən/
- Palavras longas — acerte a sílaba tônica: electricity /ɪˌlɛkˈtɹɪsɪti/, electrical /ɪˈlɛktɹɪkəl/, utility /juːˈtɪlɪti/, termination /tɚmɪˈneɪʃən/, interconnect /ˌɪn.tə.kəˈnɛkt/
Como praticar com este vídeo
- Ouça o vídeo inteiro uma vez sem falar e anote as palavras que você não conhece.
- Comece na velocidade 0,75×, faça shadowing frase por frase e volte à velocidade normal quando ficar fácil.
- Grave a sua voz e compare com o original, prestando atenção a palavras como electricity, voltage, module.
O que é a Técnica de Shadowing?
Shadowing é uma técnica de aprendizado de idiomas com base científica, originalmente desenvolvida para o treinamento de intérpretes profissionais. O método é simples, mas poderoso: você ouve áudio em inglês nativo e repete imediatamente em voz alta — como uma sombra seguindo o falante com 1-2 segundos de atraso. Pesquisas mostram melhora significativa na precisão da pronúncia, entonação, ritmo, sons conectados, compreensão auditiva e fluência na fala.