TRANSFORMER POLARITY: Everything you need to know

Рет қаралды 15,183

Жыл бұрын

In this video we explore Additive and Subtractive transformers. We talk about where the terms come from and how to do a polarity test on a live transformer to see what polarity it is. We also discuss the qualifications on which transformer manufacturers build additive and subtractive transformers and the construction differences between them. #howto #hilineacademy #journeyman #linelife #linemanlife #linejunk #linetrade #lineapprentice
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Пікірлер: 32

@eclecticlearner5943 Жыл бұрын

Your instruction is clear and unassuming. Very solid video. Thanks for sharing your knowledge my friend!

@hilineacademy8482 Жыл бұрын

Yes sir thanks for the encouragement. I appreciate it. 👍

@612murderapolis 7 ай бұрын

you explained it better than my njatc transformer book straight to the point.

@hilineacademy8482 7 ай бұрын

Thanks man. I appreciate it. If you ever have any questions please reach out. Stay safe. 👍

@SolarElectricGuy-qw8sx 3 ай бұрын

nice and perfect

@hilineacademy8482 Ай бұрын

Thank you 👍

@benjurqunov 2 ай бұрын

Nice ! It's similar to how I determine windings on a 3Φ motor. I'd never given thought to how a transformer applies.

@hilineacademy8482 2 ай бұрын

That’s interesting.👍 stay safe.

@tedlahm5740 Жыл бұрын

This is EXTREMELY INFORMATIVE.

@jeffreykornspan9053 Жыл бұрын

nice demo

@hilineacademy8482 Жыл бұрын

👍

@Rkoest Жыл бұрын

Hey Cody, what is the functional difference between an additive and subtractive transfer? Meaning, what difference does it make when the primary winding is wound in the same direction as the secondary winding or if they are wound in opposite direction?

@hilineacademy8482 Жыл бұрын

So. In the lower primary voltage transformers there’s not a lot of functionality to it. They had to make a standard, meaning that transformers with a primary voltage input of 8660 volts and above will be wound subtractive only because there is an option of winding them one of two ways. In the higher primary voltage transformers there are advantages to keeping a lower difference of potential on the same side of the transformer for insulation purposes

@James-ql8bo Ай бұрын

On a 277/480 overhead TX would the amp rating be the same as you parallel a 120/240 TX.

@alexhudson2621 20 күн бұрын

Will you not change polarity if you swap the high sides?

@tedlahm5740 Жыл бұрын

Wonderful But looking for the explanation as to why NEEDED? Under stand the rules over 200 KVA need subtractive transformer, but why?

@hilineacademy8482 Жыл бұрын

Great question. The need for larger transformers to me subtractive has more to do with building them. Without getting too much into it. It is beneficial to the transformer manufacturers to make them subtractive because the insulation needs are lower on subtractive cans. We don’t see the benefits on the distribution side as much as they do on the big power transformers where here voltages are larger.

@tedlahm5740 Жыл бұрын

X1 bushing on right side means additive transformer

@hilineacademy8482 Жыл бұрын

Correct👍

@jasonkenney5970 Жыл бұрын

If you had a single bushing transformer, could you hook up your 120v to the H1 and the case ground as opposed of the H2?

@hilineacademy8482 Жыл бұрын

Absolutely. I would hook up the hot 120 to H1 and the neutral to the pot lug (H2). Then jumper out the case to the secondary bushing on the right. Then measure with a volt meter between H1 and the left secondary bushing. Stay safe. 👍

@user-vs3bw2sf6b 6 ай бұрын

Is the H2 in this example grounded during the polarity test? Or did you energize both primary bushings?

@hilineacademy8482 5 ай бұрын

So I applied 120 volts to the primary side. Phase in H1 and neutral to H2.

@RHall-xh3ek Жыл бұрын

What if your transformer is 23900/13800 x 13800/7979 dual voltage? Is additive or subtractive?

@hilineacademy8482 Жыл бұрын

Awsome question. With dual voltage transformers, the manufacturer will base polarity off of the larger voltage requirement. In other words, since this transformer can be fed with either 13.8 or 7979 volts, they would make it a subtractive transformer because 13.8 is over the 8660 volt qualification. 👍

@benjamenclemenal.5523 Жыл бұрын

What if the suply is single phase 220v. 10kva a.c. alternator and the secondary output we need 50kw. What kind of tranformer we buy.

@jovetj Жыл бұрын

What is the practical application of this? Correct 3-phase wiring?

@hilineacademy8482 Жыл бұрын

I am a journeyman lineman and also teach transformer theory at my local apprenticeship. I started this channel so that I could help other journeyman and apprentices learn how to wire transformer banks to supply three phase power to customers. Thanks for watching. Let me know if there’s any questions I can answer. Ide love to help. 👍

@jovetj Жыл бұрын

What are the specs on that nice little transformer? Where can someone get one?

@hilineacademy8482 Жыл бұрын

It’s a 120 primary to 120/240 secondary. I bought some 1/2 kva transformers that had blown up. Then drained the oil, pulled the cores, and rewound new coils for them. It was a lot of work. I still have to wind some 208 primary to 120/240 secondary. I’ve just had a lot going on and haven’t had time to do it. 👍

@jonbaldwin 9 ай бұрын

Why not just make all transformers subtractive?

@hilineacademy8482 8 ай бұрын

Lol. “How does the posi track on a Plymouth work? It just does” That’s a great question and one that I have asked a few transformer manufacturers myself and the answer I’ve gotten in return is “tradition”. They all say that this is the standard the industry came up with and this is the way the industry will continue to do it. In other words this is what the industry came up with and to change it up now would just be a ton of un needed work. This is the standard and we can just teach the standard rather than wasting the time to dumb it down even further. Stay safe and don’t hesitate to ask questions. 👍