Timeline for Self-powered measurement unit for current transformer
Current License: CC BY-SA 4.0
10 events
| when toggle format | what | by | license | comment | |
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| Jan 14 at 13:54 | comment | added | SamGibson♦ |
@SomeoneSomewhereSupportsMonica - Hi, Are you trying to give information to the OP, following their initial comment above? Or something else? Please remember that using an @reply ensures that the intended recipient is clear.
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| Jan 14 at 11:40 | comment | added | SomeoneSomewhereSupportsMonica | CTs usually have a burden measured in VAs at full primary current. It's worth referring to this number specifically, rather than estimates. You can calculate the maximum allowable secondary voltage based on this. | |
| Oct 31, 2023 at 16:07 | comment | added | enis | Thank you for your response. I will take into account your suggestions. | |
| Oct 31, 2023 at 9:30 | comment | added | Andy aka | Your CT is 1:20 so choose something more like 1:200 and run with 0.5 amps in the secondary. With a 10 ohm burden that's a resistance projected to the primary of 10/(200 x 200) = 250 micro-ohms and this is more realistic and likely to work. You should be able to get a reasonable 5 volts DC from this. | |
| Oct 31, 2023 at 9:26 | comment | added | Andy aka | The problem with what you are wanting is that a regular current transformer is not designed to run with a burden/load that is too high and the core badly saturates so, you have to keep the burden lower than what ohms law suggests might be possible. This means also that a data sheet for a regular CT doesn't tell you what you might need to know to calculate if you are too close to bad core saturation so, it's guess work. Use a bridge rectifier on the output and choose a much higher step-up ratio is my advice. The higher the step-up ratio the better things become. | |
| Oct 31, 2023 at 9:10 | vote | accept | enis | ||
| Oct 31, 2023 at 8:56 | comment | added | Andy aka | The last sentence of my answer gives you some information but, first the site formalities.... please take note of this: What should I do when someone answers my question. If you are still confused about something then leave a comment to request further clarification. | |
| Oct 31, 2023 at 6:54 | comment | added | enis | Is there a way to convert this secondary current to voltage properly to use with opamps, microcontroller etc. Any suggestions? | |
| Oct 30, 2023 at 21:16 | history | edited | Andy aka | CC BY-SA 4.0 |
added 74 characters in body
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| Oct 30, 2023 at 20:29 | history | answered | Andy aka | CC BY-SA 4.0 |