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The past two decades have witnessed quantum advances in the application of microprocessor-based monitoring, protection, and control of power systems. Early digital devices were designed with singular functions in mind, relaying being a prime example. Thinking and practice have evolved and it is now recognized that current and voltage waveforms necessary for(More)
A typical distribution circuit consists of thousands of individual components, from transformers to switches to insulators. Failure of a single component can cause service quality and reliability problems for the entire circuit and even adjacent circuits. Under the sponsorship of the Electric Power Research Institute (EPRI), and with the cooperation of EPRI(More)
The authors describe the characteristics of high-impedance faults and the most effective techniques for detecting them. The benefits of high-impedance fault detection for industrial power systems are identified. It is shown that the most effective high-impedance-fault detection system incorporates several algorithms and monitors a number of parameters to(More)
Sprites have been detected in video camera observations from Niger over mesoscale convective systems in Nigeria during the 2006 AMMA (African Monsoon Multidisciplinary Analysis) campaign. The parent lightning flashes have been detected by multiple Extremely Low Frequency (ELF) receiving stations worldwide. The recorded charge moments of the parent lightning(More)
Weather, equipment failure, and contact by foreign objects cause faults, trips, interruptions, and outages. Most faults are either permanent, requiring repairs before service can be restored, or truly temporary, causing no lasting impairment to the system. Monitoring programs at Texas A&M University have instrumented dozens of feeders at North American(More)
High-impedance, arcing faults (HiZ faults) are a perennial problem for distribution systems. They typically occur when overhead conductors break and fall, but fail to achieve a sufficiently low-impedance path to draw significant fault current. As a result, conventional protection cannot clear them, resulting in situations that are hazardous both to(More)
Many problems in science and engineering fields involve decision-making. Usually these decision-making processes are based on several criteria that represent various experts' knowledge. Multicriteria decision-making (MCDM), however, may not provide sharp boundaries to classify candidates as belonging to single categories. To solve problems with criteria(More)
Some of the characteristics of microprocessor applications introduced over the last ten years are surveyed, and the specific benefits received from these uses are pointed out. The focus is on specific design issues that illustrate some of the design characteristics and advantages achieved by using microprocessors. Specific examples related to the(More)
Vegetation intrusion is a major cause of faults, outages, interruptions and other power quality problems on electric distribution feeders. Despite the problem vegetation intrusion presents, little fundamental work exists regarding the characterization of electrical signals generated from vegetation contacts. This paper discusses efforts to further(More)
Electric power distribution circuits are complex systems. Each circuit consists of the interconnection of literally thousands of discrete components. Each member of the body (i.e., insulators, arrestors, switches, transformers, etc.) must function properly for the body to be healthy as a whole. A broken finger, or in this case, a broken insulator, causes(More)