Network primary feeder self protected transient limiting device

A self-contained transient limiting device for use with a low-voltage, LV, network power distribution system, the LV network power distribution system comprising:

• a plurality of primary feeders;
• a plurality of feeder breakers corresponding to the plurality of primary feeders such that each feeder breaker connects one of the primary feeders to a substation;
• a plurality of network transformers, each of the network transformers being connected to one of the primary feeders, each network transformer being connected to its primary feeder between the feeder breaker and a secondary conductor used for powering a load;
• and a network protector for each network transformer, each given network protector being connected between a secondary side of its corresponding network transformer and the secondary conductor and comprising three fuses, each fuse being connected to one phase of power, the transient limiting device comprising:
• a sealed tank filled with insulating fluid, the insulating fluid having heat transfer properties;
• a power supply;
• a temperature sensor positioned to sense temperature of the insulating fluid;
• a number of core-coil assemblies comprising high voltage windings and low voltage secondary windings, the high voltage windings being connected in a grounded wye configuration and the secondary windings being connected in a broken delta configuration with a broken point;
• a low-voltage resistor connected across the broken point of the broken delta configuration of the secondary windings;
• and
• a sensing and control mechanism comprising a plurality of circuits and powered by the power supply,
• wherein, for a given one of the primary feeders, the transient limiting device is structured to be connected between the feeder breaker associated with the given primary feeder and the primary side of the network transformers associated with the given primary feeder, and
• wherein the transient limiting device is structured to limit, with resistance provided by the number of core coil assemblies and the low-voltage resistor, transient overvoltages to an arcing single line-to-ground fault on the given primary feeder, provided that the associated feeder breaker is open.