تدريب Shadowing: What’s a electrical substation and how does it work? - تعلم التحدث بالإنجليزية عبر الفيديو
جارٍ إنشاء الدرس...
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Have you ever seen a giant steel puzzle like this?
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It's a substation, and there are over 530 of them in Quebec.
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No two are the same, and each one has its own name.
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But what is a substation?
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What role does it play in the transmission and distribution of electricity?
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A substation connects parts of the power grid that aren't at the same voltage level.
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Voltage is the difference in electrical potential between two points, and it's measured in volts.
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If there's no voltage, there's no power.
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The substation's main role is to raise or lower the voltage level of the electricity before it reaches our homes.
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It also directs the electricity by determining the route it will take to reach its destination, and it protects the grid.
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The voltage of the electricity varies as it makes its way from the generating station to our neighborhoods.
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Over long distances, the voltage which can reach up to 735,000 volts.
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That's extra high voltage.
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But at home, our appliances and devices operate at 120 or 240 volts.
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That's low voltage.
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On its journey, the electricity stops at several substations and changes voltage.
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Substations adjust the voltage of the electricity as it moves from the generating station to our outlets.
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But what happens in a substation?
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Electricity enters through flexible conductors, which are cables supported by towers.
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In the substation, it passes through bus bars, which are usually large, rigid conductors.
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A voltage transformer measures the voltage, and a current transformer measures the intensity of the current in amperes.
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Next is the breaker.
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It protects the grid and the equipment in the substation by automatically cutting off the power when there's a problem.
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It can also be opened and closed manually for maintenance, for example.
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It's like the circuit breakers in your distribution panel at home.
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There are different models, but they all serve the same purpose.
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The disconnect switch is a huge switch.
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It's easy to see if it's open or closed.
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It's used in different places to disconnect equipment from the grid or provide an alternative path for the electricity.
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The disconnect switch is essential to keep people safe.
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This is the power transformer, the heart of the substation.
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It's inside this giant green box that the voltage is raised or lowered.
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Here, the transformer lowers the voltage from 315,000 to 25,000 volts.
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Not far from the transformer are the surge arresters.
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They protect the transformers from overvoltage.
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When there are lightning strikes or switching operations, they send the electricity towards the ground.
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And on the ground, there's a grid of metal wires.
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It's a safety device that protects the entire substation.
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This grounding grid disperses the electricity downwards as a safety measure.
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As it leaves the transformer, the electricity is guided to more bus bars, breakers and disconnect switches before moving to its next destination.
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At the last substation in the transmission system, electricity leaves through underground or overhead cables.
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That's the final stop before power is distributed to various neighborhoods.
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To make sure Hydro-Quebec can monitor and coordinate everything that happens in the substation,
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all the equipment is connected to a control and protection system that's housed in a control building.
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Most of the time, the operations are automated and carried out remotely.
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That's why it often seems like substations are empty.
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Hydro-Quebec crews only go there to carry out certain switching operations, maintenance, and repairs.
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But don't be fooled.
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Substations may look like quiet places, but there are risks of electrical injury and even electrocution.
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No one should ever go near a substation or try to enter one.
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Only Hydro-Quebec crews can go inside.
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They know all the substation secrets and always wear the right personal protective equipment.
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Now, the next time you see a substation, you'll know what goes on inside.
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It won't seem like a puzzle, but rather like the place where electricity makes some important stops
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as it makes its way from the generating station to our homes.
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المفردات وملاحظات التحدث لهذا الدرس
يحتوي هذا الفيديو على 55 جملة و661 كلمة للتدرب على الترديد. مدة الكلام 4:39. يتكلم المتحدث بسرعة ثابتة، نحو 142 كلمة في الدقيقة، وهي سرعة مريحة للترديد. 75% فقط من الكلمات ضمن أكثر 3,000 كلمة شيوعًا في الإنجليزية، فالمفردات صعبة نسبيًا.
أهم المفردات في هذا الفيديو
15 كلمة أقل شيوعًا من الفيديو، مع النطق والمعنى:
- voltage /ˈvəʊltɪd͡ʒ/ (اسم) — جُهْد, فُولْتِيَّة. The difference in electrostatic potential between two points in space, especially between live and neutral conductors or the earth.
- grid /ɡɹɪd/ (اسم) — شَبَك, شَبَكَة. A rectangular array of squares or rectangles of equal size, such as in a crossword puzzle.
- connect /kəˈnɛkt/ (فعل) — رَبَطَ. To join (to another object): to attach, or to be intended to attach or capable of attaching, to another object.
- destination /dɛstɪˈneɪʃən/ (اسم) — وِجْهَة, وُجْهَة. The place set for the end of a journey or to which something is sent; place or point aimed at.
- leaf /lif/ (اسم) — وَرَقَة, وَرَقة. The usually green and flat organ that represents the most prominent feature of most vegetative plants.
- puzzle /ˈpʌzəl/ (اسم) — لُغْز, مُعْضِلَة. The state of feeling confused or mystified because one cannot understand a complicated matter, a problem, etc.; bewilderment, confusion; (countable) often in…
- conductor /kənˈdʌktɚ/ (اسم) — قَائِدُ فِرْقَاتٍ مُوسِيقِيَّةٍ. One who conducts or leads; a guide; a director.
- wire /ˈwaɪɚ/ (اسم) — سِلْك. Metal formed into a thin, even thread, now usually by being drawn through a hole in a steel die.
- repair /ˈɹiːpɛɚ/ (فعل) — أَصْلَحَ. To restore to good working order, fix, or improve damaged condition; to mend; to remedy.
- monitor /ˈmɑ.nɪ.tɚ/ (اسم) — مُرَاقِب, مُرَاقِبَة. Someone who watches over something; a person in charge of something or someone.
- lightning /ˈlaɪt.nɪŋ/ (اسم) — بَرْق. 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.
- intensity /ɪnˈtɛnsɪti/ (اسم) — شِدَّة. The quality of being intense.
- flexible /ˈflɛk.sɪ.bəl/ (صفة) — مَرِن. Capable of being flexed or bent without breaking; able to be turned or twisted without breaking.
- distribute /dɪˈstɹɪbjuːt/ (فعل) — وَزَّعَ. To divide into portions and dispense.
- transformer /tɹænsˈfoɹməɹ/ (اسم) — مُحَوِّل. Something that transforms, changing its own or another thing's shape.
الأفعال المركبة التي ستسمعها
- carry out /ˈkæ.ɹi aʊt/ (فعل) — شَغَّلَ, نَفَّذَ. To hold while moving it out.
- cut off /ˌkʌt ˈɔf/ [ˌkɐɾ ˈɔf] (فعل) — قَطَعَ. To remove by cutting.
- pass through (فعل) — اِخْتَرَقَ, نَفَذَ. To go through, to travel through, to transit or lie across a place or from one place to another.
نطق يحتاج إلى انتباه
يستخدم المتحدث 4 من الصيغ المختصرة، مثل aren't, don't, won't. انطقها بصيغتها القصيرة كما تسمعها.
- أصوات “sh” و“zh”: transmission /tɹænsˈmɪʃən/, destination /dɛstɪˈneɪʃən/, substation /sʌbˈsteɪʃən/, electrocution /ɪˌlɛktɹəˈkjuːʃən/
- الكلمات الطويلة — انتبه لموضع النبر: electricity /ɪˌlɛkˈtɹɪsɪti/, electrical /ɪˈlɛktɹɪkəl/, destination /dɛstɪˈneɪʃən/, intensity /ɪnˈtɛnsɪti/, coordinate /koʊˈɔɹ.dəˌneɪt/
كيف تتدرب بهذا الفيديو
- استمع إلى الفيديو كاملًا مرة واحدة دون أن تتكلم، ودوّن الكلمات التي لا تعرفها.
- ردّد جملة جملة بالسرعة العادية، وكرّر كل جملة حتى يتطابق إيقاعك مع المتحدث.
- سجّل صوتك وقارنه بالأصل، مع الانتباه إلى كلمات مثل voltage, grid, connect.
القواعد في هذا الفيديو
أكثر التراكيب التي يستخدمها المتحدث، مع العبارات نفسها من الفيديو:
| التركيب | في الفيديو |
|---|---|
| المبني للمجهول be + اسم المفعول — التركيز على ما يحدث لا على من يفعله | be opened · is raised · is guided |
| جمل الوصل who / which + جملة — معلومة إضافية عن شخص أو شيء | voltage which can · conductors, which are · bars, which are |
ما هي تقنية التظليل الصوتي؟
التظليل الصوتي (Shadowing) تقنية تعلم لغة مدعومة علمياً، طُورت أصلاً لتدريب المترجمين الفوريين المحترفين. الطريقة بسيطة لكنها قوية: تستمع لصوت إنجليزي أصلي وتكرره فوراً بصوت عالٍ — كظل يتبع المتحدث بتأخير 1-2 ثانية. تُظهر الأبحاث تحسناً كبيراً في دقة النطق والتنغيم والإيقاع وربط الأصوات والاستماع والطلاقة.