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    9th Harmonic and Ma Bell

    We have a local telephone company complaining to our utility that they have noise on their system. We have investigated and found a fairly significant 9th harmonic on the power line. This seems to play havoc with phone systems. What is a likely cause of a 9th harmonic? We are a rural utility...
  2. W

    Transformer core saturation

    I'm trying to understand what happens to a distribution transformer in relation to overvoltage conditions (in terms of saturation and current flow; not insulation failure). I understand that once the voltage has risen high enough to drive the magnetic core past the saturation point, that the...