Agree.
But, this time, we discuss the circuit with diode bridge and burden resistor.
And, yes, the trafo's spec sheet do not tell nothing about the accuracy. It seems the burden resistor can be as high as you want

Would it be reccomended to lower the Resistor to something even lower like 10 Ohm to improve accuracy and then after the rectifier to do a voltage divider? This is 50hz current we are talking about (mains).

 

This is 50hz current we are talking about (mains).

Your current transformer has a minimum operating frequency of 2kHz.

 

Your current transformer has a minimum operating frequency of 2kHz.

I just noticed that. but what does that mean? i am geting a perfectly clean 50hz signal on the output of it, and this was reccomended to me as a component for this application (high current mains measurment).

 

I just noticed that. but what does that mean? i am geting a perfectly clean 50hz signal on the output of it, and this was reccomended to me as a component for this application (high current mains measurment).

It essentially means that optimum performance of the part will occur when you observe the stated conditions. You may get acceptable results, but the vendor will not guarantee that those results will be correct or appropriate.

 

I just noticed that. but what does that mean? i am geting a perfectly clean 50hz signal on the output of it, and this was reccomended to me as a component for this application (high current mains measurment).

It means that you should not ask that person for recommendations again.

Also, you came to this forum because your circuit was not operating properly, the first thing you therefore need to change is your current transformer. When you have an appropriate current transformer for the job, we’ll all be glad to help with any problems.
The current transformer will have too little inductance and too little voltage-time product to operate correctly. As saturation of the magnetics varies with temperature that could be a cause of the drift.

 

I agree, @kramzar needs to select a more suitable CT for this task.
Not a pleasant job as there are so many devices but look for a manufacturer that publishes detailed specifications and includes performance curves with recommended burden (load) resistors. If you are looking for high accuracy then you should include this term in your search.

 

Here’s somewhere to look:
https://www.micro-transformer.com/
nice people to deal with, as well.
Alternatively, there’s:
https://www.allegromicro.com/en/pro...ty-amp-integrated-conductor-sensor-ics/acs712

 

I just noticed that. but what does that mean? i am geting a perfectly clean 50hz signal on the output of it

It may be clean, but that doesn't mean it is accurate (which it likely is not).

 

Some points - the datasheet I discovered says that the operating frequency range is 20Hz-200kHz. It may be wrong of course.
Regarding the output voltage from the secondary - that can be estimated knowing the inductance of the transformer. As an estimate the nearest ferrite core I could see to the specified size has a typical Al value of 1600nH. A single turn therefore has an inductance of 1.6uH. At 50 Hz the impedance is 0.3milliohms, so would generate a 10mV drop at 30A. If the wire through the hole is counted as a single turn. With a step up ratio of 1:2000 the open circuit output voltage would reach 20V. The output current for 30A input would be 15mA for that ratio, so only generating 1.5V across a 100 ohm resistor. Adding a standard diode would give a significant but small error.
Now if the ferrite core is really 2 or 20kHz min you certainly need a 50Hz transformer. Almost certainly the inductance will be much higher as these are usually iron cored, and the open circuit output voltage could be lethal. With that warning, it is also far less likely to be affected by a diode voltage drop.