CT SENSOR Calibration (Very Important)

[mertkslkc]

ENS.CCT 16 100

Good afternoon, I want to use the 100A / 333mV current transformer I mentioned above for a commercial project, but I have two questions;

1. What should I do to get a value between 0-4096 with ESP32?
2. Does it work to boost 333 V with 5V opamp?
   Note: I want to avoid circuits like Burden load and voltage divider.

[TomGeorge]

Hi, @mertkslkc
Welcome to the forum.

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You will need a burden resistor, current transformers can output quite a few dangerous volts if there is no burden resistor.
What does the CT spec suggest?

Can you please post a link to data/specs of the CT?

Thanks.. Tom...

[mertkslkc]

I know that current transformers with MA output require a burden load, whereas current transformers with mV output do not need a burden load.
I left the pdf on the CT sensor I used, but I'm throwing it back for you. Thank you in advance.
The sensor i use ENS.CCT 16

EN_ENS_CCT_Current_Transformer_Leaflet.pdf

[TomGeorge]

Hi,
Good, a nice industrial grade CT, it will have the burden resistor inside.

If 333mV represents the max current it can measure, you will need some sort of amplifier to get to 0 to 5V or 0 to 1.1V, depending on your controller.

What model controller are you aiming to use?

Tom....

[mertkslkc]

The card I will use is an esp32 based development board.
LilyGO T-ETH-POE ( GitHub - Xinyuan-LilyGO/LilyGO-T-ETH-POE )

I want to raise 5 V and read over adc (resolution 4096). Is there an opamp circuit you can recommend.

[TomGeorge]

Hi,
This might be of interest, 3V3 analog input.

ESP32 Analog Input with Arduino IDE | Random Nerd Tutorials

Have you experimented with ESP32 and its analog input with a potentiometer?

Tom...

[mertkslkc]

Yes I tried it, I would be very happy if you could tell me what kind of op amp I need to boost from 333mV to 3.3 volts.

[TomGeorge]

Hi,
You will need an opamp that you can setup for a gain of 10.
The opamp has to have good rail to rail output performance.
google

ct output amplifier

Can you please tell us your electronics, programming, arduino, hardware experience?

Thanks... Tom....

[mertkslkc]

I have been working on embedded systems for 1 years. Thank you for your help Tom.