초록 ▼

A method and apparatus of detecting the locations of incipient faults in an insulated power line which comprises the method steps of opening one end of the power line, if it is not suitably terminated to reflect high frequency pulses, applying an excitation voltage to the other end of the power line

A method and apparatus of detecting the locations of incipient faults in an insulated power line which comprises the method steps of opening one end of the power line, if it is not suitably terminated to reflect high frequency pulses, applying an excitation voltage to the other end of the power line at an excitation point, detecting a first high frequency pulse produced by a discharge in the power line and transmitted on the power line to the excitation point, detecting a first reflection of the pulse from the open end of the power line to the point of excitation, detecting the travel time of a reflection of the first pulse from the excitation point to the open end of the power line and return to the excitation point, and dividing the time between the detection of the first pulse and the first reflected pulse by the detected travel time. The invention also provides a method and means for only detecting discharge pulses which occur in a predetermined range of magnitude of the excitation voltage and discharge pulses which reside within predetermined ranges of magnitudes. The discharge sites may be detected using either reflected voltage or current pulses.

대표청구항 ▼

A method of detecting the locations of incipient faults in an insulated power line comprising the steps of: applying an excitation voltage to one end of said line at an excitation point, detecting a first high frequency pulse produced by a discharge in said line and transmitted on said line to the e

A method of detecting the locations of incipient faults in an insulated power line comprising the steps of: applying an excitation voltage to one end of said line at an excitation point, detecting a first high frequency pulse produced by a discharge in said line and transmitted on said line to the excitation point, detecting a first reflection of said pulse from the other end of said line, to the point of excitation, detecting the travel time of a reflection of said first pulse from said excitation point to said other end and return to said excitation point, and dividing the time between the detection of said first pulse and said first reflected pulse by said detected travel time.