Fault parameter indicator device and related methods

摘要

A method of determining a fault parameter of a fault on an AC transmission line 10 of a power distribution system 1 relative to a measurement location 12 of the transmission line 10 comprising: measuring a time-dependent current of the transmission line 10 at the measurement location 12; transmitting a current signal indicative of the measured current to a decision logic section 36, the current signal comprising a plurality of pre-fault current values and a plurality of post-fault current values; determining, by the decision logic section 36, a plurality of phase difference values indicative of respective phase differences between respective pre-fault current values and respective post-fault current values; accumulating the plurality of phase difference values into an accumulated phase difference parameter; obtaining the fault parameter by comparing the accumulated phase difference parameter to a threshold value; and outputting the determined fault parameter.

主权项

1. A method of determining a fault parameter, including a fault direction parameter, of a fault on an AC transmission line of a power distribution system relative to a measurement location of the transmission line, the method comprising:
measuring a time-dependent current of the transmission line at the measurement location; transmitting a current signal indicative of the measured current to a decision logic section, the current signal including a plurality of pre-fault current values and a plurality of post-fault current values; determining, by the decision logic section, a plurality of phase difference values indicative of respective phase differences between respective ones of the pre-fault current values and respective ones of the post-fault current values; accumulating the plurality of phase difference values into an accumulated phase difference parameter; obtaining the fault parameter by comparing the accumulated phase difference parameter to a threshold value; and outputting the determined fault parameter, wherein measuring a time-dependent current of the transmission line includes measuring a current but measuring no voltage of the transmission line.