跟读练习: Comparing Low Voltage Vs. Medium Voltage Equipment on Solar Sites - 通过视频学习英语口语
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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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本课的词汇与口语要点
这段视频共有 28 个句子、475 个单词可供跟读。 讲话部分时长为 2:42。 说话人语速自然，每分钟约 176 个词，接近日常对话。 只有 71% 的单词属于英语最常用的 3,000 词，词汇难度较高。
视频中的重点词汇
视频中 15 个值得学习的单词，附发音和释义：
| 单词 | 发音 | 释义 |
|---|---|---|
| voltage 名词 | /ˈvəʊltɪd͡ʒ/ | 電壓 /电压 |
| utility 名词 | /juːˈtɪlɪti/ | 效用, 用處 /用处 |
| connect 动词 | /kəˈnɛkt/ | 連接 /连接 |
| fuse 名词 | /fjuːz/ | 導火線 /导火线, 導火索 /导火索 |
| overhead 名词 | /ˈəʊvəˌhɛd/ | 間接費用 /间接费用 |
| mount 动词 | /maʊnt/ | 騎 /骑 |
| string 名词 | /stɹɪŋ/ | 線 /线 |
| exception 名词 | /əkˈsɛpʃən/ | 排除 |
| pole 名词 | /pəʊl/ | 極 /极 |
| meter 名词 | /ˈmitəɹ/ | 計量表 /计量表 |
| module 名词 | /ˈmɑd͡ʒul/ | 模塊 /模块 |
| percentage 名词 | /pə(ɹ)ˈsɛntɪd͡ʒ/ | 百分率, 百分比 |
| sensitive 形容词 | /ˈsɛn.sɪt.ɪv/ | 敏感 |
| compare 动词 | /kəmˈpɛɚ/ | 比, 比較 /比较 |
| helpful 形容词 | /ˈhɛlp.fl̩/ | 有幫助 /有帮助 |
视频中的语法
说话人最常用的结构，并附上视频中的原话：
| 结构 | 视频中的用法 |
|---|---|
| 被动语态 be + 过去分词 — 强调发生了什么，而不是谁做的 | be connected · is separated · are not set |
| 定语从句 who / which + 从句 — 补充说明人或事物 | disconnect, which is · fuses, which can · breaker, which can |
需要注意的发音
说话人用了 6 次缩略和弱读形式，例如 they're, you're, we'll。请按听到的简短形式来说。
- “sh” 和 “zh” 音: exception /əkˈsɛpʃən/, efficiency /ɪˈfɪʃ.ən.si/, residential /ˌrɛzɪˈdɛnʃəl/, differentiator /dɪf.əˈɹɛn.ʃi.eɪ.tə/, interconnection /ˌɪn.tɚ.kəˈnɛk.ʃən/
- 长单词——注意重音位置: utility /juːˈtɪlɪti/, efficiency /ɪˈfɪʃ.ən.si/, residential /ˌrɛzɪˈdɛnʃəl/, fortunately /ˈfɔɹ.t͡ʃə.nɪt.li/, differentiator /dɪf.əˈɹɛn.ʃi.eɪ.tə/
如何用这段视频练习
- 先完整听一遍视频，不要开口，记下不认识的单词。
- 先用 0.75 倍速逐句跟读，熟练之后再回到正常速度。
- 录下自己的声音并与原声对比，特别注意 voltage, utility, connect 这类单词。
什么是跟读法？
跟读法 (Shadowing) 是一种有科学依据的语言学习技巧，最初开发用于专业口译员的培训，并由多语言者Alexander Arguelles博士普及。这个方法简单而强大：您在听英语母语原声的同时立即大声重复——就像是一个延迟1-2秒紧跟说话者的影子。与被动听力或语法练习不同，跟读法强迫您的大脑和口腔肌肉同时处理并模仿真实的讲话模式。研究表明它能显着提高发音准确性，语调，节奏，连读，听力理解和口语流利度——使其成为雅思口语备考和真实英语交流最有效的方法之一。