as far as i understand, in a 3 phase setup the 3 current sensors are connected in series. it should be the same as with the currentcost clamps for the mini-transmitter (http://cgi.ebay.co.uk/Current-Cost-Mini-Transmitter-c-w-12mm-CT-/1804624... + http://cgi.ebay.co.uk/Current-Cost-Daisy-Chain-CT-Sensor-Jaw-pack-two-/1... )
correct?
i tried to explain to someone how the measurement works, but i have to admit that it`s not 100% clear to me, how this CAN work at all. (sum up of alternating currents with phase shift). furthermore, on installation of the currentcost clamps, we had a weird effect that measured values decreased when switching ON the light and it went away when we changed the direction of a clamp - but i could not give a satisfying explanation on why it behaved like this.
is there some documentation on this or can someone explain the measurement principle of measuring 3 phase power with current CT clamps?
Hello Roland,
The Fluksometer current clamps contain an internal rectifier bridge, making them output a DC voltage proportional to the AC current flowing through the clamp opening. By chaining the clamp outputs in series, we're effectively summing the three induced DC voltages and offering them to the ADC for sampling.
HTH,
Bart.
ah, that makes sense!
i was curious because i did not find any rectifier or similar inside the currentcost clamps, but i assume there must be something like this inside, too. will ask the vendor.
thanks for the explanation!
roland