mivey
Senior Member
If I understand what you are asking, you want to know how we separate out the negative sequence currents/voltages? It is a simple mathmatical computation. See this link for a brief overview:in fact the gist of my problem here is that one of our friends said above (perhaps u mivey) there are some relays which can find phases themselves and break the supply if it reverses so it is not problem that even if the supply is RTS and not RST (reverse of the conventional sequence) at the moment of connection and motor runs and after a while if the sequence returns back to its conventional sequence so the relay will break the supply since at the moment it defined the sequence of the supply it takes the sequence at that moment as reference so that it will break if it reverses,
generally i see relays which have defined supply phase names as RST and it means if the conventional supply is RST so u cant run a motor in reverse direction true?
but if the relay is programmable so u can preset the sequence as RTS and it will run reverse and there is no problem from then on true?
anyway i wont ask any question about this thank u for all ur help tries...
http://www.gedigitalenergy.com/smartgrid/Dec07/7-symmetrical.pdf
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