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Distribution automation smart remote terminal unit

  • US 5,237,511 A
  • Filed: 10/29/1990
  • Issued: 08/17/1993
  • Est. Priority Date: 10/29/1990
  • Status: Expired due to Term
First Claim
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1. An improved distribution automation remote terminal unit for connection to a plurality of potential sensors and to a plurality of current sensors, said plurality of potential sensors being connected to an AC distribution feeder for sensing the AC potentials in the lines of said distribution feeder, said plurality of current sensors being connected to said distribution feeder for sensing the AC currents in said lines, said improved distribution automation remote termination unit comprising:

  • first means connected to each of said plurality of potential sensors for producing a potential signal of reduced peak-to-peak voltage corresponding in phase to only the AC potential waveform on said distribution feeder,second means connected to each of said plurality of current sensors for producing a current signal of reduced peak-to-peak voltage corresponding in phase to only the AC current waveform on said distribution feeder,means receptive of said potential and current signals from said first and second producing means for sampling the voltage of said potential and current signals a predetermined number of times per cycle to produce a digital value for each sampled voltage,means receptive of each said digital value from said converting means for processing the crest factor, overcurrent, and overvoltage parameters for a selected cycle of said plurality for sensed AC potentials and currents in said distribution feeder, said processing means further determining the operation of said potential and current sensors and of said first and second producing means, said processing means raising an error flag indication in the event that the crest factor for said selected cycle varies by more than a predetermined range about 1.414 and when the corresponding overcurrent and overvoltage parameter is absent.

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