A method operates a fault indicator, in particular a fault current indicator, which can detect a fault in an electrical energy transmission line, in particular a fault current in the energy transmission line. In the event of a detected fault, the fault indicator transmits a fault signal to a superordinate control center monitoring the energy transmission line. The fault indicator regularly or irregularly transmits at least one item of local weather information, which relates to the weather in the environment of the fault indicator, to the superordinate control center, directly to a central device other than the control center or indirectly to the other central device via the control center.

A conductor-mounted device (CMD) used to signal an intelligent electronic device (IED) of the existence of a fault on a portion of the electric power delivery system is described herein. The CMD may provide a heartbeat signal to the IED. The CMD may provide a fault signal to the IED. The CMD may be powered via a parasitic current draw on the conductor to which it is mounted. An IED may use a fault signal and/or LOC signal from a CMD to coordinate a high-impedance fault detection and/or downed line events.

The present disclosure illustrates the errors that are encountered when using both single-ended and double-ended normal-mode fault location calculations when a fault occurs in a pole-open condition. The disclosure provides systems and methods for accurately calculating the location of faults that occur during pole-open conditions, including single-ended approaches and double-ended approaches.

A dynamic real time transmission line monitor, a dynamic real time transmission line monitoring system, and a method of dynamic real time transmission line monitoring. A dynamic real time transmission line monitor includes a housing installable on a transmission line, the housing including a base portion, and a cover portion coupled to the base portion and defining a cavity of the housing together with the base portion; a sensor configured to sense in real time at least one of a temperature, a position, a current, an acceleration, a vibration, a tilt, a roll, or a distance to a nearest object; and an antenna in the cavity of the housing and configured to transmit a signal including information sensed by the sensor away from the monitor in real time.

The present invention concerns a node of an HVDC grid composed of HVDC nodes and of a plurality of links interconnecting the HVDC nodes, each HVDC node being interconnected to at least one HVDC node of the HVDC grid by a link composed of conductive cables for high voltage direct current transportation and one optical fiber, at least one HVDC node being interconnected to at least two HVDC nodes, each HVDC node comprising, for each link connecting the HVDC node to the at least one other HVDC node, a link module comprising a fault sensing device, a breaker, and an optical transceiver for communicating through the optical fiber of the link.

A sensing device for power transmission line includes an induction coil device, a sensing circuit device, and a housing. A plurality of iron cores and a plurality of windings defined in the induction coil device. The windings are wound around the iron cores. A hole for power transmission line is defined in the induction coil device. The sensing circuit device detects operation status of a power transmission line and environmental parameters. The sensing circuit device includes a cover and a bottom plate. Multiple circuit boards are mounted on the bottom plate. The induction coil device is mounted on one side of the cover. Each of two ends of the housing has a streamline shape. The housing is hollow for receiving the sensing circuit device. The iron cores of the induction coil device includes at least one first iron core and at least one second iron core.

A method of detecting a fault in a power distribution system includes placing a signal on the system at a frequency F.sub.1 and then detecting a change in the signal due to a change in the impedence of the system as a result of a fault wherein the change is one of a change in phase, a change in signal tone, or a change in voltage level at the load. In one embodiment, band reject filters can be used to diminish the signal at the load or source. In another embodiment, the power source can be a periodic pulsed power source and the signal can be placed on the system during an idle phase of the periodic pulsed power.

A method identifies a location of a fault on a faulty line of an electrical power supply network having a plurality of lines, a plurality of inner nodes, and at least three outer nodes. The outer nodes each bound a line and are provided with measurement devices which are used to measure high-frequency current and/or voltage signals. To locate faults, one of the outer nodes is selected as the starting node for the search for the fault location. Starting from the starting node, paths to the other outer nodes are determined, and that those paths on which the fault location could be located are selected. A line on which the fault location could be located, in principle, is identified for each of the selected paths using the respective times at which the traveling waves arrive, and a potential fault location is determined for the respectively identified line.

The fault location of a fault on a line of an electrical energy supply network is determined. First and second current and/or voltage values are measured and provided with a timestamp at the line ends of the line. Following the occurrence of a fault, the timestamped first and second values are used to determine the fault location. Profiles of travelling waves propagating along the line towards the line ends when the fault occurs are determined from the timestamped first and second values at both line ends. The fault location is defined from the profiles of the travelling waves from a time difference with which the travelling waves arrive at the two line ends. The time difference is derived from a pattern comparison of the profiles of the travelling waves determined for the line ends.

An aerial inspection system is provided, including an unmanned aerial vehicle (UAV) having an articulated arm coupled thereto. An end effector is coupled to a second end of the articulated arm, the end effector sized and shaped to extend at least partially around an aerial cable in close proximity. One or more sensors are positioned along an inner surface of the end effector, and provide feedback to a control unit. In response, the control unit adjusts a position of at least one of the UAV, the articulated arm, and the end effector such that the end effector maintains a close, non-contact position with respect to the cable.