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I am working on a project using Raspberry Pi and several components to operate high voltage equipment and read analog input from sensors for one of my clients.

I'm more a high level web developer but I have worked on these kind of projects in the past. So my situation right now is: I need to measure phase voltage (I'll be reading 100v~250v) and I contacted a company that makes this high frequency transformer that I need to achieve that. But they are asking for very specific data such as:

  • Inductance
  • Coil Diameter
  • Winding Number

And they won't recommend this data to me (maybe to protect themselves). Can you guys recommend which specification to give to each one of these requirements?

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  • \$\begingroup\$ Why is it called a high frequency transformer? Are there circuits already which can be used to detect high voltage or some data on high voltage for reference? \$\endgroup\$ – Umar Mar 16 '17 at 15:14
  • \$\begingroup\$ How are you planning to use this "high frequency transformer"? \$\endgroup\$ – user28910 Mar 16 '17 at 15:19
  • \$\begingroup\$ Transformers have many properties. You need to define them \$\endgroup\$ – Sunnyskyguy EE75 Mar 16 '17 at 15:50
  • \$\begingroup\$ Thanks guys, this is the product I need: feleng.en.alibaba.com/product/60584814055-803280018/… and I don't know how to define those properties, thats why I'm asking hehe \$\endgroup\$ – Multitut Mar 16 '17 at 18:03
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Yes, you may be able to use a transformer but also consider this as an option: -

enter image description here

It's an ADC isolated from ground (UL recognition: 2500 V rms for 1 minute per UL 1577) by the ADuM5401. The ADC is both powered by the ADuM5401 and talks to ground referenced equipment via SPI through that device's isolated ports.

So, using a precision voltage divider you can get better accuracy compared to a transformer. Anyway, it's food for thought should you want a back-up plan to the transformer idea.

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