| 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 |