SHUNT RESISTOR

[Abdullah]

HI everyone how to use shunt resistor in proton i am working on CT transformer but i don't know how to shunt CT volts is (+) and shunt volts is (-) ,

[charliecoutas]

Have a look at this:

https://www.electronics-tutorials.ws/transformer/current-transformer.html

Charlie

[Abdullah]

Have a look at this:

https://www.electronics-tutorials.ws/transformer/current-transformer.html

Charlie

Hi I'm measure DC Amps with using shunt resistor
Without using any IC
Using 16f684

[See_Mos]

OK, so you are not working on a C.T. that's for AC.

What is the value of your shunt resistor and the maximum current that you are measuring?

Commercial shunt resistors usually have an output of 60mV or 75mV at the rated current so you will need to amplify the output to bring it up to a level suitable for use with a PIC. 

The 16F684 does not have an internal reference voltage so you will need to amplify the input closer to 5 volts.  I would suggest using a different PIC that has an internal voltage reference for the AtoD converter which will allow you to use a lower input voltage. possibly 1.024 volts.

If you are using your own resistor you will need to calculate the resistor value to give the correct input voltage at the maximum expected current which ideally would be 5 volts for your 16F684.  Then calculate the resistor wattage

[Abdullah]

OK, so you are not working on a C.T. that's for AC.

What is the value of your shunt resistor and the maximum current that you are measuring?

Commercial shunt resistors usually have an output of 60mV or 75mV at the rated current so you will need to amplify the output to bring it up to a level suitable for use with a PIC. 

The 16F684 does not have an internal reference voltage so you will need to amplify the input closer to 5 volts.  I would suggest using a different PIC that has an internal voltage reference for the AtoD converter which will allow you to use a lower input voltage. possibly 1.024 volts.

If you are using your own resistor you will need to calculate the resistor value to give the correct input voltage at the maximum expected current which ideally would be 5 volts for your 16F684.  Then calculate the resistor wattage

Hello sir 0.05 ohm
12v 20amps maximum

[Craig]

Abdullah why don't you look at using a INA190 if possible as it will make your life a lot simpler.

[See_Mos]

So that is 1 volt and 1 watt at 20 amps.

 you could change to a different PIC that has internal voltage reference and set it to 1.024 volts.

Using an operational amplifier in differential mode would be a better way and you could use the 16F684

[Abdullah]

INA190

Sir this not available in Pakistan