It is proposed a method for monitoring an electrical power supply line comprised in a seismic cable and extending along the seismic cable. The seismic cable includes: a plurality of seismic sensors arranged along the seismic cable, a plurality of controllers arranged along the seismic cable, and an optical transmission line extending along the seismic cable for carrying data signals from or towards the controllers. The electrical power supply line supplies at least one pair of master and slave controllers. The master controller of a given pair of master and slave controllers performs a step of monitoring a portion of the electrical power supply line between the master and slave controllers, by using an optical loop established on a portion of the optical transmission line between the master and slave controllers, and starting from the master controller and passing through the slave controller.

A method, computer program, and computer system is provided for fault detection in an electrical network. An inductance between a reference point and a fault is determined at a first time based on measuring a fault current. A resistance between the reference point and the fault may be determined at a second time based on measuring a differential of the fault current as zero. A location of the fault may be identified based on the inductance and the resistance.

The invention relates to the field of magnetic resonance, and in particular to determining a location of an error in a supply or signal line (12). Due to the rugged environment for MR systems (10) in hospitals supply or signal lines (12) of MR systems (10) are error prone. For serviceability and part replacement it is important to locate the error in the supply or signal line (12) or to identify the subunit (14, 16, 18, 20) of the supply or signal line (12) in which the error occurred. The basic idea of the invention is to use an additional impedance (24), that is coupled to the supply or signal line (12) of the MR system (10) in the region of interconnection (22) for locating the error in the supply or signal line (12). The additional impedance provides a reference impedance value. By measuring the impedance and comparing the measured impedance to the reference impedance value, the error in the supply or signal line (12) can be located. In one embodiment the additional impedance (24) is realized as additional capacitance and provided as a capacitor (28).

The invention relates to a transient based method for identifying faults in an electric power transmission and/or distribution system (100) having at least one current transmission line (L.sub.12, L.sub.13, L.sub.23) comprising the following steps: —generation of a physical model of the at least one current transmission line (L.sub.12, L.sub.13, L.sub.23), the physical model depending on the fault parameters and describing the behavior of voltage and/or current transients due to the fault in the at least one current transmission line, fault parameters comprising a fault location parameter on said current transmission line (L.sub.12, L.sub.13, L.sub.23) and a fault impedance parameter, —measurement of voltage and/or currents evolution at least at one specific location in the said power system (100), —iterative simulation of the voltage and/or current evolution by the physical model at the measurement point with a set of fault parameters where at each step of iteration, simulated and measured voltage and/or current evolutions are compared and the set of fault parameters is adapted according to a convergence criterion, —identification of a fault with its fault parameters when convergence of the measured voltage and/or current evolutions and simulated voltage and/or current evolutions is reached in a limited number of iterations.

A method for characterizing a fault in a transmission line network, the method includes the steps of: obtaining a first measured time reflectogram R.sub.m from a signal previously injected into the network, obtaining a second time reflectogram R.sub.s corresponding to the network in the absence of faults, determining the time difference R.sub.ref between the first measured time reflectogram R.sub.m and the second time reflectogram R.sub.s, identifying, in the time difference R.sub.ref, an amplitude peak characterizing the presence of a fault and its time abscissa indicating the position of the fault, simulating a plurality of time reflectogram hypotheses each corresponding to the network comprising a fault at the identified position, each hypothesis being associated with a different value of at least one parameter characteristic of the fault, selecting the time reflectogram hypothesis closest to the time difference R.sub.ref.

A fault circuit indicator (FCI) detection system for electrical equipment disposed in an enclosure or vault having an above-ground vent pipe exhaust outlet comprises one or more sensors disposed in the enclosure or vault to sense a condition of at least one unit of the electrical equipment. A sensored analytics unit (SAU) is coupled to the sensors to receive sensor data and analyze the sensor data, the SAU generating a corresponding analyzed data signal that provides information related to a condition of the at least one unit of electrical equipment. A transceiver is disposed inside at least a portion of the vent pipe to receive the analyzed data signal, wherein the transceiver is configured to communicate the analyzed data signal. A visual indicator is disposed on or within the vent pipe comprising one or more visual indicators, such as LEDs, driven by a driving circuit board to provide a visual signal corresponding to the condition of the at least one unit of electrical equipment.

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).

Collect a full band capture spectral reading from a plurality of cable/fiber broadband network customer units (e.g., cable modems or equivalent optical units); for each of the cable/fiber broadband network customer units, construct an ideal spectral reading. For each of the cable/fiber broadband network customer units, subtract the ideal spectral reading from the full band capture spectral reading to obtain a resultant spectrum. For at least one of the cable/fiber broadband network customer units, identify a persistent deviation from zero in the resultant spectrum that does not match a known impairment type. Identify at least one new impairment type corresponding to the persistent deviation from zero. Remediation of the new impairment type can be carried out as appropriate, and/or a detection pattern can be deployed to identify future occurrences of the new impairment type.

A light guide or beam guiding system with safety component and a method for its breakage monitoring. The present invention provides a fiber optic cable comprising a power fiber as well as first and second channels for break and plug monitoring of the power fiber, wherein the first and second channels may be separate.

In one embodiment, a method includes transmitting power in a power and data distribution system comprising at least two pairs of wires, negotiating a power level between Power Sourcing Equipment (PSE) and a Powered Device (PD) in the power and data distribution system, transmitting the power at a power level greater than 100 watts, periodically checking each of the wires for a fault, and checking for an electrical imbalance at the wires.