Pratique du Shadowing: What’s a electrical substation and how does it work? - Apprendre l'anglais à l'oral avec la vidéo

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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Vocabulaire et conseils d’expression pour cette leçon

Cette vidéo contient 55 phrases et 661 mots à répéter en shadowing. La partie parlée dure 4:39. Le locuteur parle à un rythme régulier d’environ 142 mots par minute, confortable pour le shadowing. Seuls 75 % des mots font partie des 3 000 mots les plus courants en anglais, le vocabulaire est donc exigeant.

Vocabulaire clé de cette vidéo

15 mots moins courants de la vidéo, avec leur prononciation et leur sens :

voltage /ˈvəʊltɪd͡ʒ/ (nom) — tension, voltage. The difference in electrostatic potential between two points in space, especially between live and neutral conductors or the earth.
grid /ɡɹɪd/ (nom) — grille. A rectangular array of squares or rectangles of equal size, such as in a crossword puzzle.
generate /ˈd͡ʒɛn.ə.ɹeɪt/ (verbe) — générer. To bring into being; give rise to.
breaker /ˈbɹeɪkɚ/ (nom) — casseur. Something that breaks (something else).
connect /kəˈnɛkt/ (verbe) — accoupler, connecter. To join (to another object): to attach, or to be intended to attach or capable of attaching, to another object.
transmission /tɹænsˈmɪʃən/ (nom) — transmission. The act of transmitting, e.g. data (signals) or electric power.
destination /dɛstɪˈneɪʃən/ (nom) — destination, arrivée. The place set for the end of a journey or to which something is sent; place or point aimed at.
leaf /lif/ (nom) — feuille. The usually green and flat organ that represents the most prominent feature of most vegetative plants.
puzzle /ˈpʌzəl/ (nom) — énigme, mystère. The state of feeling confused or mystified because one cannot understand a complicated matter, a problem, etc.; bewilderment, confusion; (countable) often in…
conductor /kənˈdʌktɚ/ (nom) — chef d'orchestre. One who conducts or leads; a guide; a director.
wire /ˈwaɪɚ/ (nom) — fil. Metal formed into a thin, even thread, now usually by being drawn through a hole in a steel die.
repair /ˈɹiːpɛɚ/ (verbe) — réparer. To restore to good working order, fix, or improve damaged condition; to mend; to remedy.
monitor /ˈmɑ.nɪ.tɚ/ (nom) — moniteur, monitrice. Someone who watches over something; a person in charge of something or someone.
underground /ˌʌn.dəɹˈɡɹaʊnd/ (adjectif) — souterrain. Below the ground; below the surface of the Earth.
vary /ˈvɛəɹi/ (verbe) — varier. To change with time or a similar parameter.

Les verbes à particule que vous entendrez

carry out /ˈkæ.ɹi aʊt/ (verbe) — sortir, transporter dehors. To hold while moving it out.
cut off /ˌkʌt ˈɔf/ [ˌkɐɾ ˈɔf] (verbe) — tailler, couper. To remove by cutting.
go on /ˈɡoʊˌɒn/ (verbe) — continuer. To continue in extent.
pass through (verbe) — traverser. To go through, to travel through, to transit or lie across a place or from one place to another.

Prononciation à surveiller

Le locuteur utilise 4 contractions et formes réduites, comme aren't, don't, won't. Prononcez-les sous leur forme courte, telles que vous les entendez.

Les sons « sh » et « zh »: transmission /tɹænsˈmɪʃən/, destination /dɛstɪˈneɪʃən/, substation /sʌbˈsteɪʃən/, electrocution /ɪˌlɛktɹəˈkjuːʃən/
Mots longs — placez bien l’accent: electricity /ɪˌlɛkˈtɹɪsɪti/, electrical /ɪˈlɛktɹɪkəl/, destination /dɛstɪˈneɪʃən/, intensity /ɪnˈtɛnsɪti/, coordinate /koʊˈɔɹ.dəˌneɪt/

Comment s’entraîner avec cette vidéo

Écoutez la vidéo en entier une fois sans parler et notez les mots que vous ne connaissez pas.
Répétez phrase par phrase à vitesse normale, en reprenant chacune jusqu’à ce que votre rythme corresponde à celui du locuteur.
Enregistrez-vous et comparez avec l’original, en faisant attention à des mots comme voltage, grid, generate.

La grammaire de cette vidéo

Les structures que le locuteur utilise le plus, avec les mots exacts de la vidéo :

Structure	Dans la vidéo
Voix passive be + participe passé — l’accent est mis sur ce qui arrive, pas sur qui le fait	be opened · is raised · is guided
Propositions relatives who / which + proposition — une précision sur une personne ou une chose	voltage which can · conductors, which are · bars, which are

Qu'est-ce que la technique du Shadowing ?

Le Shadowing est une technique d'apprentissage des langues fondée sur la science, développée à l'origine pour la formation des interprètes professionnels. Le principe est simple mais puissant : vous écoutez de l'anglais natif et le répétez immédiatement à voix haute — comme une ombre suivant le locuteur avec un décalage de 1 à 2 secondes. Les recherches montrent une amélioration significative de la précision de la prononciation, de l'intonation, du rythme, des liaisons, de la compréhension orale et de la fluidité.

Technique du shadowing : lire le guide complet étape par étape →

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