Electronics > Projects, Designs, and Technical Stuff
Transformer phase angle error
<< < (4/8) > >>
wraper:

--- Quote from: Jester on December 19, 2018, 04:20:20 pm ---
--- Quote from: wraper on December 19, 2018, 03:25:41 pm ---
--- Quote from: Jester on December 19, 2018, 03:21:08 pm ---
--- Quote from: wraper on December 19, 2018, 03:18:50 pm ---Why do you need it in the first place? There might be solutions to your problem without getting such transformer.

--- End quote ---

Isolation, transformation from 120V to 12V

--- End quote ---
That is not an answer and is irrelevant to why you need low phase shift.

--- End quote ---

If your asking what the application is, the answer is a metering instrument.

--- End quote ---
This is not a good answer as well. What do you want particularly? Zero cross detect, or what?
Jester:

--- Quote from: wraper on December 19, 2018, 08:11:10 pm ---
--- Quote from: Jester on December 19, 2018, 04:20:20 pm ---
--- Quote from: wraper on December 19, 2018, 03:25:41 pm ---
--- Quote from: Jester on December 19, 2018, 03:21:08 pm ---
--- Quote from: wraper on December 19, 2018, 03:18:50 pm ---Why do you need it in the first place? There might be solutions to your problem without getting such transformer.

--- End quote ---

Isolation, transformation from 120V to 12V

--- End quote ---
That is not an answer and is irrelevant to why you need low phase shift.

--- End quote ---

If your asking what the application is, the answer is a metering instrument.

--- End quote ---
This is not a good answer as well. What do you want particularly? Zero cross detect, or what?

--- End quote ---

We're measuring energy, aiming for better than 1%
wraper:

--- Quote from: Jester on December 19, 2018, 08:20:56 pm ---
--- Quote from: wraper on December 19, 2018, 08:11:10 pm ---
--- Quote from: Jester on December 19, 2018, 04:20:20 pm ---
--- Quote from: wraper on December 19, 2018, 03:25:41 pm ---
--- Quote from: Jester on December 19, 2018, 03:21:08 pm ---
--- Quote from: wraper on December 19, 2018, 03:18:50 pm ---Why do you need it in the first place? There might be solutions to your problem without getting such transformer.

--- End quote ---

Isolation, transformation from 120V to 12V

--- End quote ---
That is not an answer and is irrelevant to why you need low phase shift.

--- End quote ---

If your asking what the application is, the answer is a metering instrument.

--- End quote ---
This is not a good answer as well. What do you want particularly? Zero cross detect, or what?

--- End quote ---

We're measuring energy, aiming for better than 1%

--- End quote ---
Then you should not use transformer to begin with.
rstofer:
You should be using instrument grade transformers.

https://www.gegridsolutions.com/products/manuals/ITITechInfo.pdf

See page 9 (top right) for a test card of a typical transformer.  Phase shift is on the order of 5 minutes of angle - less than 0.1 degree.

The problem will be to find an instrument transformer with the ratio you need.  And they probably aren't cheap!

If I could prove that the phase shift of a given transformer was consistent over a range, I would calibrate it out in code..
wraper:

--- Quote from: rstofer on December 19, 2018, 08:35:20 pm ---If I could prove that the phase shift of a given transformer was consistent over a range, I would calibrate it out in code..

--- End quote ---
There are more problems than phase shift. Output signal(voltage) just won't be accurate.
Navigation
Message Index
Next page
Previous page
There was an error while thanking
Thanking...

Go to full version
Powered by SMFPacks Advanced Attachments Uploader Mod