Switching High current string

Projects General Guidance
1

Dear all,

I am trying to build string monitoring solution for solar application. There are totally 24 string carrying 25A @ 1000v. commonly connected via string to bus bar. Main purpose of string monitor is to measure current through each string. It not need to measure current for every XX min of interval. Purpose is to make ensure all string are providing proper current

I have done with 2 ways

  1. hall sensor based current transducer : where each string pass through hall sensor. which gives analog output 0~5v .
  2. Shunt basis method: I have attached similar link above. Where current measured w.r.t RSh and gives 0~5v analog output connected to sensor.

I used MUX circuit after each analog output and connected to arduino uno board.

Both are working fine Now. Based on this i am trying to do similar since all connected common bus bar before giving input Rshunt resistor is it possible to switch the input level. like in MUX. I know we can't do with IC @ that voltage. Instead of making seprate 24 string/using indivual hall or shunt basis network. Can We use one circuit and just switch the input and read the string .
Is it SAFE???
Is there any way of doing it.

This will reduce my cost.

2

the question is if you can switch 24 lines that are 25A/1kv

cost of switches ?

or 24 separate hall sensors that come back to a couple MUX units ?

one circuit board that could have 24 analog input to one ADC (multi channel ?)
this would cost less than $100. I would think that the switches for 1kv would be much more expensive.

and what happens when you switch the load ? it is easy to find devices rated to 200 v as you get over 600v the devices are harder to find and cost lots more.

I like to leave the measured thing alone and only add sensors. that way if you need to remove the sensors, you do not have to touch the thing being measured.

also, if you sketch this out, you would need a DP unit to have the line come in and then out of your measuring device.
and you also need some way to guarantee that it would not be possible to ever have two energized at the same time, even if one fails in the engaged position.