A5034276658- Neutrino Physics Research
- Power Systems Fault Detection
- Particle physics theoretical and experimental studies
- Astrophysics and Cosmic Phenomena
- Dark Matter and Cosmic Phenomena
- Power System Reliability and Maintenance
- Electrical Fault Detection and Protection
- Radiation Detection and Scintillator Technologies
- Particle Detector Development and Performance
- Smart Grid Security and Resilience
- Atomic and Subatomic Physics Research
- Lightning and Electromagnetic Phenomena
- Islanding Detection in Power Systems
- Power Systems and Technologies
- Power Line Communications and Noise
- Nuclear Physics and Applications
- Fault Detection and Control Systems
- Smart Grid and Power Systems
- Electricity Theft Detection Techniques
- Power Transformer Diagnostics and Insulation
- Muon and positron interactions and applications
- High voltage insulation and dielectric phenomena
- Neural Networks and Applications
- Advanced Fiber Optic Sensors
- Electromagnetic Compatibility and Noise Suppression
Texas A&M University
2009-2024
Lawrence Berkeley National Laboratory
2020-2024
Massachusetts Institute of Technology
2024
Yale University
2017-2022
University of California, Santa Barbara
2022
University of Chicago
2022
Bioengineering Center
2017
National Center for Genetic Engineering and Biotechnology
2017
John Wiley & Sons (United States)
2017
Hudson Institute
2017
This paper describes work performed by Texas A&M University on the detection of high impedance faults distribution primary conductors. Some grounded conductors may exhibit a very low fault current such that they not be cleared over-current protection. These persist indefinitely, possibly causing fire hazard or to humans contact with an energized line. The begins examination problem from perspective system theory is presented next. utilizes fault-generated increase in 2-10 kHz component...
Certain smart grid technologies can reduce the number of customers affected by prolonged outages, and thereby increase reliability through automated switching to restore service. Such are useful, but reactive in nature, performing their function only after a fault occurs an outage has been detected. They must presume that nonfaulted feeder sections alternative feeders healthy capable carrying increased power flow. Research at Texas A&M University demonstrated sophisticated, real-time...
Signal processing hardware and software that can be used to improve the detection of certain power system faults using computer relays are discussed. Integrated systems architectures for monitoring several fault-sensitive parameters have been investigated. A suggested architecture utilizing processors is presented. Several arcing methodology based on these described, a partial solution problem directionality The use knowledge-based environment modify protection criteria suggested.< <ETX...
Distribution protection systems must balance dependability with security considerations to be practical. This is quite difficult for high-impedance faults. Only highly sensitive algorithms can achieve absolute in detecting very low current high sensitivity results a propensity false tripping, creating less secure, system and resulting the potential decreased service continuity lower reliability. Researchers at Texas A&M University have balanced fault detection discrimination, practical...
Distribution protection systems must balance dependability with security considerations to be practical. This is quite difficult for high impedance faults. Only highly sensitive algorithms can achieve absolute in detecting very low current sensitivity results a propensity false tripping, creating less secure system and resulting the potential decreased service continuity lower reliability. Researchers at Texas A&M University have balanced fault detection discrimination, practical combination...
Phase currents and voltages in a distribution power system change with certain degree of chaos when high impedance faults (HIFs) occur. This paper describes application the concepts fractal geometry to analyze chaotic properties faults. Root-mean-square rather that instantaneous values are used for characterization temporal behavior; this results relatively short time-series available analysis. An algorithm is presented pattern recognition detection HIFs; it based on techniques suited...
Traditional extremely low frequency (ELF) magnetic field computation techniques assume that the current carrying power line conductors are straight horizontal wires. This assumption results in a model whose fields distorted from those produced reality. An exact solution and an approximation proposed for modeling by sagged of lines, taking advantage fact equation catenary exactly describes sag. The approaches differ required computational burden precision results. A mapping measurement...
Previous papers have described a method for the detection of arcing fallen distribution primiary conductor faults using electrical noise in feeder current above 2kHz. While this provided improved such faults, high frequency signal often would not propagate past capacitor banks. In present paper, we describe technique identification impedance burst signals at frequencies near power system fundamental and low order harmonics. Arcing generates non-synchronous which approximate white noise,...
Abstract For the evaluation of occupant safety in case building fires, Required Safe Egress Time/Available Time (RSET/ASET) concept has become widespread and is now commonly used fire engineering profession. It also by smoke detector (smoke alarm) manufacturers assessing whether a particular technology adequate. shown this paper that intrinsically flawed its use promotes diminishment available to occupants. The innately ignores wide variations capabilities physical condition persons involved...
Several low frequencies of the current waveform in distribution feeders exhibit modified behavior under fault conditions. Two frequencies, 180 Hz and 210 Hz, were selected for study owing to strong magnitude variations associated with arcing faults at these frequencies. A hierarchical algorithm adaptive characteristics is presented along performance results its application The various parameters that affect sensitivity are discussed. tests using recorded field data given, effects a digital...
Distribution feeder faults modulate primary current and generate noise through arcing phenomena. The variation behaviors selected low frequencies during fault conditions are presented. These contrasted with normal events such as feeder-switching capacitor-bank operations. Recorded field data have been analyzed, the statistical results Specific behavior characteristics arc duration, repetition rate, magnitude of low-frequency spectra Comparisons made for different soil types conditions.< <ETX...
Over the past several years, distribution utilities have invested heavily in installations of "smart-meter" advanced metering initiative (AMI) systems. Among anticipated benefits these systems, with smart-meter deployments are generally able to quickly assess which portions their systems operating normally and customers experiencing an outage. Projects at multiple focused on integrating AMI information, along traditional supervisory control data acquisition sources, into utility management...
A downed conductor, arcing fault detection system has been designed using multiple protection algorithms. An intelligent analysis processes the outputs from several algorithms to determine "confidence" that a exists. The design includes careful attention discriminating faults normal activity ensure security. Key acceptance of this is testing under actual field conditions. results long term tests on five utilities are presented. behavior prototype systems staged faults, naturally occurring...
Abstract The novel SoLAr concept aims to extend sensitivities of liquid-argon neutrino detectors down the MeV scale for next-generation detectors. plans accomplish this with a time projection chamber that employs an anode plane dual charge and light readout, which enables precision matching signals data acquisition reconstruction purposes. We present results first demonstration detector small-scale prototype integrating pixel-based readout silicon photomultipliers on shared printed circuit...
Drought conditions in the United States recent years bring increased attention to age-old issue of power line-caused fires. It has long been known that line faults and failures can cause wildfires through multiple mechanisms. Failure mechanisms various apparatus operational result wildfire ignition are reviewed. Case studies from operating utility systems presented, along with a discussion how these represent competent sources for wildfires. Methods preventing discussed.
Under certain conditions, one electrical parameter (independent variable) is not enough to detect high-impedance faults on surface conditions. These do draw sufficient current for detection and may less than similar other soil surfaces. Moreover, because every displays characteristics of randomness, it difficult assign a probability that given event fault, rather switching event. It has been shown by induction laws can improve the classification events. The second third are utilized with...
Under certain conditions, one electrical parameter (independent variable) is not enough to detect high-impedance faults on surface conditions. These do draw sufficient current for detection and may less than similar other soil surfaces. Moreover, because every displays characteristics of randomness, it difficult assign a probability that given event fault, rather switching event. It has been shown by induction laws can improve the classification events. The second third are utilized with...
Vegetation intrusion is a major cause of faults, outages, interruptions and other power quality problems on electric distribution feeders. Despite the problem vegetation presents, little fundamental work exists regarding characterization electrical signals generated from contacts. This paper discusses efforts to further characterize physical phenomena associated with contacts feeder conductors through field experiments. Researchers used tree branches varying types diameters span primary...
Using varying environmental parameters and nonadapting detection techniques, the authors propose a generic method for choosing fault technique or techniques which are most appropriate given set of conditions. This result is achieved using decision-making under incomplete knowledge. The performance each derived various conditions environments with this method. not yet complete because outcome all fully defined. However, it provides head start when attempting to optimize consideration wide...
Latent power line conditions, such as vegetation intrusion and apparatus that have failed or are in the process of failing can cause recurring fault events. Many conditions influenced by other factors wind moisture, therefore events only intermittently. These difficult to detect locate with conventional technologies. Fault current arcing from recurrent faults further damage already weak apparatus, ultimately leading a catastrophic failure, at which time there may be more consequential...