adc - Calculating a burden resistor for a current transformer

Background:

I follow a reference design for a single phase power meter (230 V, max 3 A). The below circuit is to measure current via a current transformer.

• A current transformer will be connected to the CUR1+/- andCUR2+/- terminals (two current transformers in total).


• CUR1 and CUR2 are to measure current on phase and neutral


• D1-D8 are for protection.


• D9-D10 are for a transient voltage suppressor.


• R9 and R10 are the burden resistors.



• The right part of the R9 and R10 are anti-aliasing filters.


• I1+/- and I2+/- are connected to an analog-to-digital converter of a microcontroller

I am planning to use this current transformer as it is one of the lowest-priced options on that supplier.

• Turn ratio: 1:1000


• Inductance: 8 mH


• Current rating: 200 A


• Secondary resistance: 26 ohms

Question:

The design does not specify what current transformer is used on the circuit and how I should calculate the burden resistors. It says maximum applied voltage to the ADC is ±920 mV.

• How should I calculate the burden resistors R9 and R10? Do I need to consider the filter part while calculating the values?


• I see different values for the secondary resistance. What is it important for? Is it used in the calculation of the burden resistors?


• As I understood, the inductance's effect of the current transformer on reactive power will be corrected on a different stage. Apart from that, is the inductance matter for the above circuit?


• It is a single-phase power meter. Is it enough to measure the current at only one current channel? If it is so, why would it be needed to have a measurement on both channels?