シャドーイング練習: What’s a electrical substation and how does it work? - 動画で英語スピーキングを学ぶ

Have you ever seen a giant steel puzzle like this?

It's a substation, and there are over 530 of them in Quebec.

No two are the same, and each one has its own name.

But what is a substation?

What role does it play in the transmission and distribution of electricity?

A substation connects parts of the power grid that aren't at the same voltage level.

Voltage is the difference in electrical potential between two points, and it's measured in volts.

If there's no voltage, there's no power.

The substation's main role is to raise or lower the voltage level of the electricity before it reaches our homes.

It also directs the electricity by determining the route it will take to reach its destination, and it protects the grid.

The voltage of the electricity varies as it makes its way from the generating station to our neighborhoods.

Over long distances, the voltage which can reach up to 735,000 volts.

That's extra high voltage.

But at home, our appliances and devices operate at 120 or 240 volts.

That's low voltage.

On its journey, the electricity stops at several substations and changes voltage.

Substations adjust the voltage of the electricity as it moves from the generating station to our outlets.

But what happens in a substation?

Electricity enters through flexible conductors, which are cables supported by towers.

In the substation, it passes through bus bars, which are usually large, rigid conductors.

A voltage transformer measures the voltage, and a current transformer measures the intensity of the current in amperes.

Next is the breaker.

It protects the grid and the equipment in the substation by automatically cutting off the power when there's a problem.

It can also be opened and closed manually for maintenance, for example.

It's like the circuit breakers in your distribution panel at home.

There are different models, but they all serve the same purpose.

The disconnect switch is a huge switch.

It's easy to see if it's open or closed.

It's used in different places to disconnect equipment from the grid or provide an alternative path for the electricity.

The disconnect switch is essential to keep people safe.

This is the power transformer, the heart of the substation.

It's inside this giant green box that the voltage is raised or lowered.

Here, the transformer lowers the voltage from 315,000 to 25,000 volts.

Not far from the transformer are the surge arresters.

They protect the transformers from overvoltage.

When there are lightning strikes or switching operations, they send the electricity towards the ground.

And on the ground, there's a grid of metal wires.

It's a safety device that protects the entire substation.

This grounding grid disperses the electricity downwards as a safety measure.

As it leaves the transformer, the electricity is guided to more bus bars, breakers and disconnect switches before moving to its next destination.

At the last substation in the transmission system, electricity leaves through underground or overhead cables.

That's the final stop before power is distributed to various neighborhoods.

To make sure Hydro-Quebec can monitor and coordinate everything that happens in the substation,

all the equipment is connected to a control and protection system that's housed in a control building.

Most of the time, the operations are automated and carried out remotely.

That's why it often seems like substations are empty.

Hydro-Quebec crews only go there to carry out certain switching operations, maintenance, and repairs.

But don't be fooled.

Substations may look like quiet places, but there are risks of electrical injury and even electrocution.

No one should ever go near a substation or try to enter one.

Only Hydro-Quebec crews can go inside.

They know all the substation secrets and always wear the right personal protective equipment.

Now, the next time you see a substation, you'll know what goes on inside.

It won't seem like a puzzle, but rather like the place where electricity makes some important stops

as it makes its way from the generating station to our homes.

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このレッスンの語彙とスピーキングのポイント

この動画には、シャドーイング用の文が55文、単語が661語あります。音声の長さは4:39です。話す速さは1分あたり約142語で安定しており、シャドーイングしやすいペースです。英語の頻出3,000語に含まれる単語は75%だけなので、語彙は難しめです。

この動画の重要語彙

動画に出てくるやや難しい単語15語を、発音と意味つきで紹介します。

voltage /ˈvəʊltɪd͡ʒ/ (名詞) — 電圧. The difference in electrostatic potential between two points in space, especially between live and neutral conductors or the earth.
grid /ɡɹɪd/ (名詞) — 格子, グリッド. A rectangular array of squares or rectangles of equal size, such as in a crossword puzzle.
generate /ˈd͡ʒɛn.ə.ɹeɪt/ (動詞) — 生む, 生み出す. To bring into being; give rise to.
breaker /ˈbɹeɪkɚ/ (名詞) — 破壊者. Something that breaks (something else).
connect /kəˈnɛkt/ (動詞) — 繋げる. To join (to another object): to attach, or to be intended to attach or capable of attaching, to another object.
transmission /tɹænsˈmɪʃən/ (名詞) — 転送, 伝送. The act of transmitting, e.g. data (signals) or electric power.
destination /dɛstɪˈneɪʃən/ (名詞) — 目的地. The place set for the end of a journey or to which something is sent; place or point aimed at.
leaf /lif/ (名詞) — 葉, 葉っぱ. The usually green and flat organ that represents the most prominent feature of most vegetative plants.
puzzle /ˈpʌzəl/ (名詞) — 難題, 難問. The state of feeling confused or mystified because one cannot understand a complicated matter, a problem, etc.; bewilderment, confusion; (countable) often in…
conductor /kənˈdʌktɚ/ (名詞) — 指揮者. One who conducts or leads; a guide; a director.
wire /ˈwaɪɚ/ (名詞) — 針金, 線. Metal formed into a thin, even thread, now usually by being drawn through a hole in a steel die.
repair /ˈɹiːpɛɚ/ (動詞) — 修理する. To restore to good working order, fix, or improve damaged condition; to mend; to remedy.
monitor /ˈmɑ.nɪ.tɚ/ (名詞) — モニター. Someone who watches over something; a person in charge of something or someone.
underground /ˌʌn.dəɹˈɡɹaʊnd/ (形容詞) — 地下. Below the ground; below the surface of the Earth.
lightning /ˈlaɪt.nɪŋ/ (名詞) — 稲妻, 雷光. A flash of light produced by short-duration, high-voltage discharge of electricity within a cloud, between clouds, or between a cloud and the earth.

動画に出てくる句動詞

carry out /ˈkæ.ɹi aʊt/ (動詞) — 行う, 実行する. To hold while moving it out.
cut off /ˌkʌt ˈɔf/ [ˌkɐɾ ˈɔf] (動詞) — 断つ. To remove by cutting.

注意したい発音

話し手はaren't, don't, won'tなど、短縮形や弱形を4回使っています。聞こえたとおりの短い形で発音しましょう。

「sh」と「zh」の音: transmission /tɹænsˈmɪʃən/, destination /dɛstɪˈneɪʃən/, substation /sʌbˈsteɪʃən/, electrocution /ɪˌlɛktɹəˈkjuːʃən/
長い単語（アクセントの位置に注意）: electricity /ɪˌlɛkˈtɹɪsɪti/, electrical /ɪˈlɛktɹɪkəl/, destination /dɛstɪˈneɪʃən/, intensity /ɪnˈtɛnsɪti/, coordinate /koʊˈɔɹ.dəˌneɪt/

この動画での練習方法

まず声を出さずに動画を最後まで聞き、知らない単語をメモします。
通常の速度で一文ずつシャドーイングし、話し手のリズムに合うまで繰り返します。
自分の声を録音して元の音声と比べます。voltage, grid, generateなどの単語に特に注意しましょう。

この動画の文法

話し手がよく使っている文型を、動画の実際の表現とともに紹介します。

文型	動画での表現
受動態 be + 過去分詞 — 誰がするかより、何が起きるかに焦点を当てる	be opened · is raised · is guided
関係詞節 who / which + 節 — 人や物について情報を加える	voltage which can · conductors, which are · bars, which are

シャドーイングとは？英語上達に効果的な理由

シャドーイング（Shadowing）は、もともとプロの通訳者養成プログラムで開発された言語学習法で、多言語習得者として知られるDr. Alexander Arguelles によって広く普及されました。方法はシンプルですが非常に効果的：ネイティブスピーカーの英語を聞きながら、1〜2秒の遅延で声に出してすぐに繰り返す——まるで「影（shadow）」のように話者を追いかけます。文法ドリルや受動的なリスニングと異なり、シャドーイングは脳と口の筋肉が同時にリアルタイムで英語を処理・再現することを強制します。研究により、発音精度、抑揚、リズム、連音、リスニング力、そして会話の流暢さが大幅に向上することが確認されています。IELTSスピーキング対策や自然な英語コミュニケーションを目指す方に特におすすめです。

シャドーイングのやり方: ステップ別の完全ガイドを読む →

シャドーイング練習: What’s a electrical substation and how does it work? - 動画で英語スピーキングを学ぶ

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