Power meter question/implementation

[storm21]

I have a question regarding an installation power meter. I am having trouble figuring out a way to connect this monitor to our system, I work a large production facility as a 4th year electrical engineering intern.

The switchboard that I have to hook this up to has a range of ~25-2500 amps. The meter has a nominal range of ~5-10.6 amps. My first thought was to connect a Currernt transformer, and I believe this would work if the source did not have such a wide range. Because of the linear operation of the current transformer there would be no CT I could use to match up these two items.

My next thought was maybe there is a non linear operating CT?
Or maybe if I had several different CT’s for each bracket of amperage for example:
one that would deal this the 25-200 amps
one for the 200-1000 amps range
one for the 1000-2500 amps range
and then I could maybe switch between these ct’s with a system of relay?

I might be over thinking this but simply put my source has an amp range to wide to be able to directly connect a standard CT directly to my power meter.

[Anonymous]

Hi,

 

You can either connect separate power meters with individual CT’s for each branch, or you can connect a CT on the line side of the panel to get the reading for all of the loads in the panel.

 

Hope this helps.

[Author]

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