Ferroresonance in a distribution system

Discussion in 'The Projects Forum' started by Cerkit, Feb 11, 2015.

  1. Cerkit

    Thread Starter Senior Member

    Jan 4, 2009

    I am trying to understand Ferroresonance in an electricity distribution system.

    The extent I understand is that long cable lengths mean that there is a capacitance in the cables because of capacitance developed between each other and capacitance between the cables and earth. This capacitance is essentially energy stored in the system, when there is a disturbance in the system ie a switch opened this energy creates a spike in energy dissipated for example arcing across the switch opened leading to prolonged arcing. It appears this is most likely to occur when there is a transformer at the end which is lightly or not loaded at all, meaning there is no load to dampen the energy.

    Can someone explain the significance of it occuring only when one of the phases is disconnected? Why doesn't it occur if all three phases are disconnected? And what is the significance of it bieng a non linear inductance (the transformer) at the end of the cable route?

    Trying to understand the theory behind it.

    Any help would be much appreciated.