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Analysis of very-high-resistance grounding in high-voltage longwall power systems
IEEE Transactions on Industry Applications, 2001The application of very sensitive ground-fault protection in underground coal mines was demonstrated in the early 1980s for low- and medium-voltage utilization circuits (less than 1 kV), but its commercial application did not occur until the advent of high-voltage utilization circuits on longwalls in the late 1980s.
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High-Resistance Ground Retrofits in Pulp and Paper Mills
IEEE Industry Applications Magazine, 2001The safety and reliability of low-voltage, high-resistance grounding (HRG) schemes have made them an excellent choice for applications in the pulp, paper and other process industries. As facilities shift toward this technology for reliability in low-voltage substations, retrofitting existing grounded systems becomes the focus of several critical ...
Robert Beltz +2 more
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II — Experience on a system with high ground resistance
Electrical Engineering, 1932FOR YEARS, lightning storms in the territory served by the Edison Electric Illuminating Company of Boston have been accompanied by numerous blown fuses, damaged and burned out transformers, and other troubles, all of which caused many outages to customers with consequent annoyance to them as well as expense to the company.
T. H. Haines, C. A. Corney
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Digital fault location for high resistance grounded transmission lines
IEEE Transactions on Power Delivery, 1999This paper demonstrates that the presence of multiple load taps cannot be neglected for single-phase-to-ground fault location. A new method has been developed taking this into consideration, that can be applied to correct the location error due to intermediate power sources.
T. Funabashi +7 more
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Fault locating in ungrounded and high-resistance grounded systems
IEEE Transactions on Industry Applications, 2001One of the most common and difficult problems to solve in industrial power systems is the location and elimination of the ground fault. Ground faults that occur in ungrounded and high-resistance grounded systems do not draw enough current to trigger circuit breaker or fuse operation, making them difficult to localize. Techniques currently used to track
T. Baldwin +3 more
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Resistance to adipocyte hyperplasia in ground squirrels given high-fat diets
American Journal of Physiology-Regulatory, Integrative and Comparative Physiology, 1987Mammalian hibernators prepare for the winter by depositing fat in existing fat cells. There is little, if any, production of new fat cells. This is curious because equivalent fat deposition in rats is associated with substantial fat cell production.
I M, Faust, N, Mrosovsky
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Conversion of Ungrounded Systems to High-Resistance Grounding Systems
2006 IEEE Industrial and Commercial Power Systems Technical Conference - Conference Record, 2006An innovative method is proposed where charging current can be measured and grounding resistors sized without staging a fault. Overvoltages have caused damage to equipment and voltage transformer fuse blowing an ungrounded 4.8 kV delta distribution system.
P.E. Sutherland, A. Mansoor
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TENCON 2010 - 2010 IEEE Region 10 Conference, 2010
Power system is generally protected from lightning strokes by surge arresters which are provided with a low earth resistance connection to enable the large currents encountered to be effectively discharged to the general mass of earth. This offers some resistance to the flow of current which depends on electrode arrangements as well as the surrounding ...
Y Khan +4 more
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Power system is generally protected from lightning strokes by surge arresters which are provided with a low earth resistance connection to enable the large currents encountered to be effectively discharged to the general mass of earth. This offers some resistance to the flow of current which depends on electrode arrangements as well as the surrounding ...
Y Khan +4 more
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International Journal of Emerging Electric Power Systems, 2011
Grounding arrangement is very important to maintain safe and reliable operation of a power system and to ensure safety of the power apparatus and operating personnel. In Saudi Arabia, the weather is dry and the soil resistivity varies significantly from area to area because the geodetic terrain varies from sea shore to the arid desert and dry mountains.
Abdulrehman Ali Al-Arainy +3 more
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Grounding arrangement is very important to maintain safe and reliable operation of a power system and to ensure safety of the power apparatus and operating personnel. In Saudi Arabia, the weather is dry and the soil resistivity varies significantly from area to area because the geodetic terrain varies from sea shore to the arid desert and dry mountains.
Abdulrehman Ali Al-Arainy +3 more
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Ground Fault Monitoring for Motor-Drive Systems with High Resistance Grounding
2023 IEEE International Electric Machines & Drives Conference (IEMDC), 2023Jiangang Hu +3 more
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