A power distribution monitoring system is provided that can include a number of features. The system can include a plurality of power line sensing devices configured to attach to individual conductors on a power grid distribution network. In some embodiments, the power line sensors can include a split-core transformer. In some embodiments, a power line sensing device is disposed on each conductor of a three-phase network. The sensing devices can be configured to measure and monitor, among other things, current and electric-field on the conductors. Methods of installing, sealing, and protecting the split-core transformers of the power line sensors are also discussed.

Energy harvest split core design elements for ease of installation, high performance, and long term reliability

A power distribution monitoring system is provided that can include a number of features. The system can include a plurality of monitoring devices configured to attach to individual conductors on a power grid distribution network. In some embodiments, a monitoring device is disposed on each conductor of a three-phase network and utilizes a split-core transformer to harvest energy from the conductors. The monitoring devices can be configured to harvest energy from the AC power grid and apply a DC bias to core halves of the split-core transformer to maintain a positive magnetic force between the core halves. Methods of installing and using the monitoring devices are also provided.

Distribution Line Clamp Force Using DC Bias on Coil

Systems and methods for remotely monitoring and detecting faults in power distribution systems. In one embodiment, a remote fault monitoring system comprises a plurality of remote fault detection devices distributed on a power distribution network, and a monitoring station. Each remote detect device includes a first electrical parameter measurement circuit electrically or electromagnetically coupled to a neutral power distribution circuit conductor, and a second electrical parameter measurement circuit electrically or electromagnetically coupled to a power distribution circuit ground conductor. The monitoring station receives measurements transmitted by the remote fault detection devices and determines from the measurements whether a fault intermediate a pair of adjacent remote fault detection devices has occurred.

Remote fault monitoring in power lines

Methods and systems for spatially assisted fault reporting in a distribution system Typical steps of the methods may include determining the location of the fault or the distance to the fault, generating and storing a plurality of waypoints (103) representative of the route of the distribution system, processing the plurality of waypoints (103), determining spatial coordinates of the fault, generating a fault report (100), and communicating the fault report. The waypoints may be contained within an XML file which is compressed wit a compression algorithm prior to sending and which is decompressed prior to use at a receiving end to create a visual template or overlay for displaying the fault information (100).

Spatially Assisted Fault Reporting Method, System and Apparatus

In order to appropriately guide subjects in such a manner that the privacy of the subjects is protected despite using images containing the subjects, this guidance system is provided with an image capturing unit capable of taking images containing subjects from a first direction, a detection unit that detects the sizes of the images of the subjects from the images captured by the image capturing unit, and a guidance unit that guides the subjects on the basis of the detection results of the detection unit.

Guidance system, detection device, and position assessment device

In a system for transmitting an electrical power supply by means of an over-head power transmission line supported by power transmission towers, a fault such as a short-circuit fault and a ground fault is detected by providing optical current sensors having opto-magnetic elements and opto-electric field elements on respective conductors of the transmission line to detect a fault current and fault voltage on the basis of the Faraday's effect and Pockel's effect. Light beams passing through the elements are modulated by the magnetic fields induced by the currents passing through the conductors and the voltages on the conductors, and thus include information about the current and voltage. There is further provided a circuit for calculating a distance to a fault point in accordance with the detected current, voltage and a phase difference therebetween and a known impedance of the power transmission line. The thus calculated distance to the fault point is displayed on display means which is arranged at the power transmission tower or the substation.

Apparatus for detecting faults on power transmission lines

PROBLEM TO BE SOLVED: To provide a battery failure detecting method and a battery failure detecting system with simple procedure and low cost. SOLUTION: A system detects battery failure of every battery unit in a battery array in which at least two battery units are connected in series. The system has a voltmeter 10 for measuring the voltage of each battery unit 4, a determining device 16 for determining whether a measured voltage is within a set range or not, and an alarm means 12 for alarming the failure of the battery unit 4 and/or a display means for displaying the failure of the battery unit 4 when the measured voltage is outside the set range.

Battery failure detecting method and battery failure detecting system

In a system for transmitting an electrical power supply by means of an over-head power transmission line supported by power transmission towers, a fault such as a short-circuit fault and a ground fault is detected by providing optical current sensors (1) having opto-magnetic elements (3) and opto-electric field elements (20) on respective con­ductors (7) of the transmission line to detect a fault current and fault voltage on the basis of the Faraday's effect and Pockel's effect Light beams passing through the elements are modulated by the magnetic fields induced by the currents passing through the conductors and the voltages on the conductors, and thus include information about the current and voltage There is further provided a circuit for calculating a distance to a fault point in accordance with the detected current, voltage and a phase difference therebetween and a known impedance of the power transmission line The thus calculated distance to the fault point is displayed on a display device which is arranged at the power transmission tower or the sub-­station

Apparatus for detecting fault on power transmission lines

A system for detecting a fault occurred within a substation and judging a location of the fault including optical current sensors each having a Faraday element arranged on a top of an insulator post of a bus disconnecting switch, a magnetic core arranged to surround a terminal plate of the disconnecting switch to generate a magnetic field corresponding to a current passing through the terminal plate, a laser diode for emitting a laser light beam, an optical fiber for guiding the laser beam to the Faraday element, a photodiode, and an optical fiber for guiding the laser beam transmitted through the Faraday element to the photodiode. The photodiode supplies a signal representing the current passing through the terminal plate to a fault location judging circuit in which the fault location within the substation is judged from the signals from the photodiodes.

System utilizing optical current sensors for detecting fault location in substation

PROBLEM TO BE SOLVED: To provide a simple and low cost battery fault detecting method. SOLUTION: The battery fault detecting method detecting the fault of a battery in each battery unit in a battery array connecting at least two battery units in series. The open circuit voltage value at the discharge end of each battery unit is measured. A voltage difference is calculated by comparing the measured open circuit voltage value of the discharge end with a setting voltage value that is the average of the open circuit voltage values of the discharge ends measured for all battery units. The voltage difference is judged whether it is within the setting value or not. When the voltage difference is outside of the setting range, the battery unit is detected as fault. The simple and low cost detection system is provided because the failure is detected without calculating the depth of discharge from the measured voltage value. A battery unit having a fault is specified even in a large battery system connecting a plurality of single batteries, so that only the battery unit having a fault is required repairment, adjustment or the like. COPYRIGHT: (C)2004,JPO&NCIPI

Kawaguchi Toshiyuki

Papers

Apparatus for detecting faults on power transmission lines

Battery failure detecting method and battery failure detecting system

Apparatus for detecting fault on power transmission lines

System utilizing optical current sensors for detecting fault location in substation

Battery fault detecting method