Continue to Site

Eng-Tips is the largest engineering community on the Internet

Intelligent Work Forums for Engineering Professionals

  • Congratulations waross on being selected by the Eng-Tips community for having the most helpful posts in the forums last week. Way to Go!

Recent content by niallmolloy

  1. niallmolloy

    Rule of Thumb for Calculating Capacitive Coupling Charging Current

    rkallies, The charging current can be dependent on the voltage level and the conducting medium (OHL vs Cable), also take into account the whole network at this voltage level as anything else that is connected to the busbar will contribute to the charging current. If you are installing a very...
  2. niallmolloy

    Induced Currents in Pipelines

    This is also a serious issue in electric rail systems. As far as i know, corrosion is mainly a DC problem. Look up some IEEE papers on stray current for detailed anslysis. Niall Niall Molloy Power Engineer - Railway Systems Mott Macdonald
  3. niallmolloy

    What does a transformer vector of Ddoyn11 mean?

    Andy, A Dd0yn11 transformer has one primary winding (D) and two secondary windings, a delta wound (d),and a star wound (y). The n means that the neutral is "brought out" and can be used as a neutral on a per phase basis. And you are correct the 0 means that the d is 0 degrees out of phase with...

Part and Inventory Search