Provided is an on-line monitoring and fault diagnosis
system for a power distribution network PT. The
system can be used for measuring
three phase currents,
three phase voltages, three line voltages and zero sequence
voltage data of the power distribution network PT. Whether the
system has a single-phase grounding fault, a
ferromagnetic resonance fault and a PT line breakage fault can be accurately judged through actually-measured data. The system is composed of a current measurement terminal, a collector and a background
server. The current measurement terminal is arranged on a three-
phase line of the power distribution network PT, and the
three phase currents of the power distribution network PT are measured according to the
electromagnetic induction principle. The collector is arranged on a panel of a PT cabinet, receives data of the terminal, meanwhile, measures the phase voltages, the line voltages and a zero sequence
voltage of the PT, and uploads the data to the background
server. The background
server is arranged inside a
transformer substation, receives the data of the collector, and conducts on-line monitoring and fault diagnosis on the power distribution network PT. According to the on-line monitoring and fault diagnosis system for the power distribution network PT, technology is mature, and reliability is high.