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Power factor monitor in 3phase motor - current transformer

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Posted 27 January 2005 - 06:39 PM

What current transformer should I choose to support a current of 15.9A at 400VAC (3phase - I leave in Portugal and F-N itīs 230VAC). The current transformer with ratio 1:1000 thatīs oK? You said that I had to do the same circuit in each phase (I supposed that) but I only need one current transformer, thatīs right?!
In each comparator I have to supply them with current and voltage... The current we use current transformer and the voltage we supply directly,passing by resistances, the Amp-Ops?
Just one more question... and if we havenīt Neutro (just 3phase) how we connect the circuit?

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