High impedance fault detector

Details High impedance fault detector High impedance fault detector

G - Physics

01

R

G01R 31/08 (2006.01) G01R 23/165 (2006.01) H02H 1/00 (2006.01) H02H 3/52 (2006.01) H02H 7/26 (2006.01)

Patent

CA 2139755

A method and apparatus for detecting high impedance faults and other arcing phenomena in an electrical distribution sys- tem. Electrical signals on the distribution system are monitored and a number of frequency components isolated, such as zero-se- quence current and voltage, second harmonic voltage, third harmonic current, eighth harmonic voltage and current, and a mea- sure of magnitude of the components are taken over successive data acquisition periods. The measures of the component magnitudes are formed into a pattern for each data acquisition period, and the difference between patterns for successive periods are compared against a pattern threshold which is set to suit the characteristics of the distribution system. A pattern difference greater than the pattern threshold indicates the possibility of an arcing fault, which can then be confirmed by determining wheth- er the frequency components are modulated at twice the fundamental frequency of the distribution system.

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