Shadowing Practice: Inside Substation Transformers - Learn English Speaking with Video

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Substation transformers or power transformers, these are the biggest and most expensive piece of equipment in a substation.
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You're typically looking in a transmission substation.
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You'd be looking at power transformers that cost $3 million, $5 million, or maybe even a little more than that.
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The size of these are, think, railway cars or maybe three quarters of a railway car, or half of a semi-truck trailer, for example.
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They are big pieces of equipment.
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And what we see here is down in the tank, we see the windings and the cores.
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So once again, substations are always three-phase, just like the transmission lines are always three-phases.
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A, B, and C transformers, they are typically three-phase.
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Now, you could run into situations in which you actually have three separate transformers, one for each phase.
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You might see that outside of a large generating station where you've got these big step-up transformers.
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They could be in three separate tanks.
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But in general, it's more common to see all three phases in the same tank.
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And in this tank, you've got a lot of mineral oil, which is providing cooling and insulation.
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And the windings are generally insulated and they have paper insulation usually.
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And then there's some cooling mechanisms, including radiators and fans.
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And some transformers actually had pumps on them to pump the oil through the radiator.
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So keeping a transformer cool is required because of the vast amounts of current that is passing through the conductors, creating heat.
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And like I said before, heat and moisture are power equipment's worst enemies.
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Radiators, fans, pumps, they all serve to help cool the transformer.
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You see the large bushings and you actually see some surge arresters here as well.
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They will be frequently mounted to protect the transformer from transient over voltages and traveling waves.
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And this oil conservator is just an expansion tank and serves a couple other purposes,
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but really provides room for the oil to expand because the oil will expand, the mineral oil, it will expand as it heats up.
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And let me point out that these three large bushings that you see here, they would be on the high voltage side.
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I do see places where the lower voltage bushings would be, and that would be right here, but these may be the bushings,
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but they're awful small and they would be right here
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so you got a total of six bushings three on the high side
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and three on the low side
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and once again bushings are the transition point in this case between the tank containing all the oil
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and the air where the overhead lines are coming in

Who Should Watch This Video for English Practice?

This video is perfect for intermediate to advanced English learners aiming to boost their technical vocabulary and fluency. Whether you’re preparing for IELTS speaking practice or want to sound confident discussing complex topics, the detailed explanations of substation transformers provide rich material for english speaking practice. The clear, conversational tone makes it ideal for shadowing—repeating phrases aloud to mimic rhythm and pronunciation.

Key Words & Phrases to Master

Expand your technical lexicon with these standout terms from the video:

  • Power transformers: Large equipment that changes electricity voltage (e.g., "Power transformers are the most expensive in a substation").
  • Mineral oil: A liquid used for cooling and insulation (e.g., "Mineral oil expands as it heats up").
  • Surge arresters: Devices that protect equipment from sudden voltage spikes (e.g., "Surge arresters guard against transient over voltages").
  • Bushings: Components that connect internal parts to external lines (e.g., "Bushings transition between the oil tank and overhead lines").

How to Perfect Your Pronunciation with This Video

To improve your English pronunciation, focus on the speaker’s clear, deliberate pace. Use shadow speech—pause the video after short phrases and repeat them, matching stress and intonation. Notice how "three-phase" (TH-REE FAYZ) and "radiators" (RAY-dee-ay-tors) are emphasized. For tricky terms like "transient" (TRAN-zee-unt) or "conservator" (kun-SER-vuh-tor), break them into syllables. A shadowing app can help you record and compare your delivery, ensuring you mimic the natural flow. Practice daily to build confidence in pronouncing technical words, a skill that will shine in academic or professional settings.

What is the Shadowing Technique?

Shadowing is a science-backed language learning technique originally developed for professional interpreter training and popularized by polyglot Dr. Alexander Arguelles. The method is simple but powerful: you listen to native English audio and immediately repeat it out loud — like a shadow following the speaker with just a 1–2 second delay. Unlike passive listening or grammar drills, shadowing forces your brain and mouth muscles to simultaneously process and reproduce real speech patterns. Research shows it significantly improves pronunciation accuracy, intonation, rhythm, connected speech, listening comprehension, and speaking fluency — making it one of the most effective methods for IELTS Speaking preparation and real-world English communication.

Shadowing technique: read the full step-by-step guide →