Shadowing Practice: Comparing Low Voltage Vs. Medium Voltage Equipment on Solar Sites - Learn English Speaking with Video
Ders oluşturuluyor...
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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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Bu dersin kelimeleri ve konuşma notları
Bu videoda gölgeleme çalışması için 28 cümle ve 475 kelime var. Konuşma bölümü 2:42 sürüyor. Konuşmacı dakikada yaklaşık 176 kelimeyle, günlük konuşmaya yakın doğal bir hızda konuşuyor. Kelimelerin yalnızca %71’i İngilizcede en sık kullanılan 3.000 kelime arasında, bu yüzden kelime dağarcığı zorlayıcı.
Bu videodaki önemli kelimeler
Videodan öğrenmeye değer 15 kelime, telaffuzu ve anlamıyla:
| Kelime | Telaffuz | Anlam |
|---|---|---|
| voltage isim | /ˈvəʊltɪd͡ʒ/ | gerilim |
| fuse isim | /fjuːz/ | fitil |
| overhead isim | /ˈəʊvəˌhɛd/ | genel giderler |
| string isim | /stɹɪŋ/ | ip, tel |
| exception isim | /əkˈsɛpʃən/ | istisna |
| pole isim | /pəʊl/ | kutup |
| meter isim | /ˈmitəɹ/ | metre |
| module isim | /ˈmɑd͡ʒul/ | modül |
| sensitive sıfat | /ˈsɛn.sɪt.ɪv/ | alıngan, darılgan |
| compare fiil | /kəmˈpɛɚ/ | karşılaştırmak, kıyaslamak |
| remote sıfat | /ɹəˈməʊt̞/ | uzak, uzaktan kontrol |
| efficiency isim | /ɪˈfɪʃ.ən.si/ | verimlilik |
| frequency isim | /ˈfɹiːkwənsi/ | frekans |
| encounter fiil | /ɪnˈkaʊntɚ/ | rastlamak |
| blade isim | /bleɪd/ | ağız |
Bu videodaki dil bilgisi
Konuşmacının en çok kullandığı yapılar, videodaki sözcüklerin aynısıyla:
| Yapı | Videoda |
|---|---|
| Edilgen yapı be + fiilin üçüncü hâli — kimin yaptığı değil, ne olduğu önemli | be connected · is separated · are not set |
| İlgi cümlecikleri who / which + cümle — bir kişi ya da şey hakkında ek bilgi | disconnect, which is · fuses, which can · breaker, which can |
Dikkat edilecek telaffuzlar
Konuşmacı they're, you're, we'll gibi kısaltılmış biçimleri 6 kez kullanıyor. Bunları duyduğunuz gibi kısa söyleyin.
- “sh” ve “zh” sesleri: exception /əkˈsɛpʃən/, efficiency /ɪˈfɪʃ.ən.si/, residential /ˌrɛzɪˈdɛnʃəl/, differentiator /dɪf.əˈɹɛn.ʃi.eɪ.tə/, interconnection /ˌɪn.tɚ.kəˈnɛk.ʃən/
- Uzun kelimeler — vurguyu doğru yere koyun: utility /juːˈtɪlɪti/, efficiency /ɪˈfɪʃ.ən.si/, residential /ˌrɛzɪˈdɛnʃəl/, fortunately /ˈfɔɹ.t͡ʃə.nɪt.li/, differentiator /dɪf.əˈɹɛn.ʃi.eɪ.tə/
Bu videoyla nasıl çalışılır
- Videonun tamamını konuşmadan bir kez dinleyin ve bilmediğiniz kelimeleri not edin.
- 0,75× hızla başlayın, cümle cümle tekrar edin ve kolaylaşınca normal hıza dönün.
- Kendinizi kaydedin ve orijinaliyle karşılaştırın; voltage, fuse, overhead gibi kelimelere özellikle dikkat edin.
Gölgeleme Tekniği Nedir?
Gölgeleme, başlangıçta profesyonel tercüman eğitimi için geliştirilen ve çok dilli Dr. Alexander Arguelles tarafından popüler hale getirilen, bilim destekli bir dil öğrenme tekniğidir. Yöntem basit ama güçlüdür: ana dili İngilizce olan bir sesi dinler ve hemen yüksek sesle tekrar edersiniz — konuşmacıyı 1-2 saniye gecikmeyle takip eden bir gölge gibi. Pasif dinleme veya dilbilgisi alıştırmalarının aksine, gölgeleme beyninizi ve ağız kaslarınızı gerçek konuşma kalıplarını eşzamanlı olarak işlemeye ve yeniden üretmeye zorlar. Araştırmalar, telaffuz doğruluğu, tonlama, ritim, bağlı konuşma, dinleme anlama ve konuşma akıcılığını önemli ölçüde geliştirdiğini göstermektedir — bu da onu IELTS Konuşma hazırlığı ve gerçek dünya İngilizce iletişimi için en etkili yöntemlerden biri yapar.