TRANSFORMER POLARITY: Everything you need to know
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- Опубліковано 18 вер 2022
- 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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Your instruction is clear and unassuming. Very solid video. Thanks for sharing your knowledge my friend!
Yes sir thanks for the encouragement. I appreciate it. 👍
you explained it better than my njatc transformer book straight to the point.
Thanks man. I appreciate it. If you ever have any questions please reach out. Stay safe. 👍
This is EXTREMELY INFORMATIVE.
nice and perfect
Thank you 👍
Nice !
It's similar to how I determine windings on a 3Φ motor.
I'd never given thought to how a transformer applies.
That’s interesting.👍 stay safe.
nice demo
👍
On a 277/480 overhead TX would the amp rating be the same as you parallel a 120/240 TX.
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?
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
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?
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. 👍
Will you not change polarity if you swap the high sides?
Is the H2 in this example grounded during the polarity test? Or did you energize both primary bushings?
So I applied 120 volts to the primary side. Phase in H1 and neutral to H2.
Wonderful But looking for the explanation as to why NEEDED?
Under stand the rules over 200 KVA need subtractive transformer, but
why?
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.
What are the specs on that nice little transformer? Where can someone get one?
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. 👍
What if your transformer is 23900/13800 x 13800/7979 dual voltage? Is additive or subtractive?
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. 👍
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.
X1 bushing on right side means additive transformer
Correct👍
What is the practical application of this? Correct 3-phase wiring?
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. 👍
Why not just make all transformers subtractive?
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. 👍