CT measurement

Submitted by Larsjo on Mon, 13/02/2012 - 19:33

have a 6kw solar setup on 2 wires (ct1 and ct2)
when i connect emonTx wiht CT1 and CT2 i get this readings. (see graph)

What i dont get is that it start out OK, but after a while ct2 is falling in readings.
like it is invertet. Anybody seen this behavior before.

It follows the CT clamp, so if i switch 1 and 2 its still on the same CT clamp.

Submitted by glyn.hudson on Sun, 19/02/2012 - 21:49.

Try clipping on CT 2 to opposit way round. Are CT1 and CT2 measuring the same thing?

Submitted by Larsjo on Mon, 20/02/2012 - 12:47.

Found out it is releated to the fase I use for ac/ac voltage readings.

So if i dont use the voltage skech, and set the voltage to 230v it works.

So have to look into how the voltage reading is done, and at what time.

Submitted by glyn.hudson on Mon, 20/02/2012 - 13:09.

Ah right, what do you mean by 'fase'?

Submitted by S Bateman on Mon, 20/02/2012 - 21:00.

Phase ?

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