Abstract: The location of high resistance ground faults within buried co-axial power cables can be detected by transmitting a combined signal along the cable at a primary frequency of 0.718 Hz and a primary amplitude in the order of 4,500 volts peak to peak. This combined signal also has an interlocked secondary frequency of 11,780 Hz superimposed on the primary frequency. The ratio between the reactive impedance and resistive impedance is such as to create a condition where the 0.718 Hz primary frequency's single source caused resistive current is usually larger than the sum or total of all that cable's per foot of length's 0.718 Hz reactive currents. This condition then enables the detection of the resistive ground faults by a manually transported Receiver. When needed the effective resistance and/or capacitance of the cable can be increased by a remote end connection circuit.

Abstract: The location of high resistance ground faults within buried co-axial power cables can be detected by transmitting a combined signal along the cable at a primary frequency of 0.718 Hz and a primary amplitude in the order of 4,500 volts peak to peak, This combined signal also has an interlocked secondary frequency of 11,780 Hz superimposed on the primary frequency. The ratio between the reactive impedance and resistive impedance is such as to create a condition where the 0.718 Hz primary frequency's single source caused resistive current is usually larger than the sum or total of all that cable's per foot of length's 0.718 Hz reactive currents. This condition then enables the detection of the resistive ground faults by a manually transported Receiver. When needed the effective resistance and/or capacitance of the cable can be increased by a remote end connection circuit.

Abstract: Faults in electrical coaxial power cables are detected by transmitting a pulsed signal into the cable at a frequency of 512 Hz at an amplitude of the order of 4000 volts peak-to-peak. The capacitance of the cable is adjusted by a separate capacitive tuning box to generate a parallel resonant condition between the transmitter and the cable. These parameters create a condition in which the resistive current generated by the fault is larger than the capacitive/reactive current per foot of the cable enabling detection of the fault by a manually transported receiver dedicated to the frequency of the transmissions.

Abstract: The device consists of a transmitter and a receiver. The transmitter utilizes multiple frequencies generated by a binary counter divider and includes a carrier frequency, an I.F. frequency, an audible tone frequency, a frequency which gives the ability to use battery power efficiently and a frequency which gives the ability of easy interpretation of the results. It includes a Norgate controlling the ON and OFF state of a power switch which in turn controls a capacitive driver source through a matching transformer to the "load". The receiver consists of a series of sequential filters each tuned to the three highest encodements of the transmitter and operating a visual and audible transducers on the receiver.