A direction finder for power quality disturbances based upon disturbance power and energy

While existing techniques are capable of automatically identifying and clas sifying various types of distribution-level power quality disturbances, the y do not provide any information about the locations of the disturbance sou rces, This paper shows that it is possible to use sampled voltage and curre nt waveforms to determine on which side of a recording de,ice a disturbance originates, This is accomplished by examining the energy flow and peak ins tantaneous power for both capacitor energizing and voltage sag disturbances . We demonstrate the technique by testing it on both ATP-generated waveform s and actual field disturbance data. In both cases, we are able to accurate ly determine on which side of a recording device the disturbance originates . If enough recording devices are available in a network, the individual re adings can be collectively used to pinpoint the locations of disturbance so urces.