A system for ground fault detection includes an alternating current (AC) excitation source configured to provide an AC test signal to a circuit under test; a current transformer configured to detect a current of the AC test signal; a capacitive pickup configured to detect a voltage of the AC test signal; and a receiver which includes a display; and a processor configured to receive the voltage from the capacitive pickup; receive the current from the current transformer; and display on the display one or more components of the current.

A stimulation engine configured to identify a fault condition in an implantable lead, including a regulator configured to deliver an electrical pulse between at least two electrodes of the implantable stimulation lead, and a sensing module configured to detect at least an initial voltage and a subsequent voltage between the at least two electrodes at different times during delivery of the electrical pulse, and compare at least the subsequent voltage to a defined threshold value representing an expected voltage at the same time during the electrical pulse to determine the presence of a fault condition.

A leakage detector is used with a cable tray run configured to support one or more electrical cables. The leakage detector includes an electrical conductor extending around the cable tray run generally transverse to a length of the cable tray run. A magnetic sensor is coupled to the electrical conductor. In use the leakage detector is configured to sense magnetic flux generated by current flowing through the one or more electrical conductors adjacent the leakage detector. More than one leakage detector can be used in a leakage detection system. The leakage detection system may further include a central computing device to determine if there is leakage current from the one or more electrical conductor in the cable tray run based on signals received from the leakage detectors.

This applications relates to methods and apparatus monitoring of subsea cables (100), for example subsea power or telecommunication cables, and in particular to determining a burial status for such cables. The method involves interrogating a sensing optical fibre (107) with an interrogator unit (108) to perform distributed fibre optic sensing. The sensing optical fibre (107) is deployed along the path of the subsea cable (100) and may, in some instances, form part of the subsea cable. A frequency spectrum of the respective measurement signal from at least one sensing portion of the sensing fibre (107), which corresponds to pressure variations (ΔP(t)) due to surface water waves (109) to determine a burial status. High frequency components of the pressure variation that are detected in any unburied section (106) are attenuated in buried sections (105).

The present disclosure uses a capacitive voltage divider to supply a voltage that can be more readily handled by main-stream semiconductor and magnetic components (generally less than 1000 volts). The divided system voltage, expected to be between 500 and 1000 volts, is then converted to a power supply voltage to be used by the measuring equipment. For safety reasons, this voltage is frequently required to be less than approximately 50 volts if it is delivered via a connectorized cable with exposed contacts.

The present disclosure relates to determining locations of low-energy events on power lines. For example, an IED may receiving an input signal indicating a local electrical condition of a power line. The IED may detect traveling waves on the power line based on the local electrical condition. The IED may detect traveling waves on the power line based on the local and remote electrical conditions. The IED may determine that the traveling waves are associated with a low-energy event. The IED may determine the location of the low-energy event on the power line based at least in part on the traveling waves.

A mobile earth leaking survey apparatus is provided. The apparatus includes a magnetic field sensor. The apparatus includes a plurality of electrodes configured to be capacitively coupled to ground. The apparatus includes a signal timing unit for finding and setting a time T by analyzing signals input from the magnetic field sensor, wherein the time T matches a signal start time of a survey current transmitter. The apparatus includes a signal detection unit for identifying a polarity and a magnitude of a signal from the magnetic field sensor for a predetermined discrete period of time at a predetermined interval time from the time T. The apparatus includes a potential measuring unit for measuring an earth potential value input from the plurality of electrodes.

A buried perimeter loop wire break detector with a base unit and probe unit. The base unit injects different frequencies into the two ends of the loop wire and the probe unit detects the frequencies at a test location along the wire. If a signal is not detected, that indicates the direction toward the break. By halving the distance along the wire toward the break and retesting, the location is quickly determined. Both frequencies and amplitude are measured, sometimes with amplification, both earth and wired grounds may be employed, and a micro-ohmmeter measures resistance of the loop wire to indicate satisfactory operation.

Fault detection system (800) for a medium voltage circuit comprising assemblies of an electric power distribution cable (205), a first transformation center (210) comprising a first transformer and a first grounding conductor (603), a first grounding system comprising a first grounding resistor (RPAT1) connected to the first transformer through the first grounding conductor (603), the first transformation center (210) connected to a first end of the cable (205) and a second transformation center (220) comprising a second transformer and a second grounding conductor (603), a second grounding system comprising a second grounding resistor (RPAT2) connected to the second transformer through the second grounding conductor (603), the second transformation center (220) connected to a second end of the cable (205).

A method, an apparatus and a system that may be configured to determine and provide a direction-to-source indicator on a signal level meter or other test instrument that may be used by a user of the meter (e.g., a technician, maintenance personnel or other personnel) to locate the source of leakage such as home leakage (HL).