Boots – shoes – and leggings
Patent
1993-09-08
1995-10-03
Ramirez, Ellis B.
Boots, shoes, and leggings
364481, 364483, 324509, 324521, 361 88, G01R 3100, G01R 3108
Patent
active
054557763
ABSTRACT:
A fault location system comprises voltage/current transducers 10A, 10B located at terminals A and B, respectively; digital relays 12A and 12B respectively coupled to transducer blocks 10A and 10B; and a fault location estimation processor 14, which may comprise a substation controller at substation S.sub.A or substation S.sub.B, a relay at A or B, a stand alone computer at A or B, or a computer at a central location. The digital relays receive analog voltage and current signals (V.sub.A, I.sub.A, V.sub.B, I.sub.B) from the respective transducers and output digital phasor or oscillographic data to the fault location estimation block. The fault location estimation block is programmed to provide the fault location parameter m. The fault location estimation provided by the inventive technique is unaffected by the fault resistance, load current, mutual coupling effects from a parallel line, uncertainties in zero sequence values, shunt elements, and X/R characteristic of the system. The fault location can be estimated accurately even in cases of substantial resistance and load flow. In addition, the invention does not require synchronization of the data received from the respective A and B terminals, nor does it require pre-fault data or fault type selection.
REFERENCES:
patent: 3590368 (1971-06-01), Esclangon
patent: 4107778 (1978-08-01), Nii et al.
patent: 4128805 (1978-12-01), Lanz
patent: 4281386 (1981-07-01), Kondow et al.
patent: 4313169 (1982-01-01), Takagi et al.
patent: 4314199 (1982-02-01), Yamaura et al.
patent: 4455612 (1984-06-01), Girgis et al.
patent: 4795983 (1989-01-01), Crockett et al.
patent: 4797805 (1989-01-01), Nimmersjo
patent: 4803635 (1989-02-01), Andow
patent: 4812995 (1989-03-01), Girgis et al.
patent: 4851782 (1989-07-01), Jeerings et al.
patent: 4871971 (1989-10-01), Jeerings et al.
patent: 4906937 (1990-03-01), Wilkstrom et al.
patent: 4998098 (1991-03-01), Schweitzer, III
patent: 5072403 (1991-12-01), Johns
patent: 5181026 (1993-01-01), Granville
Doctoral Dissertation of Muchuan M. Chen, "Managerial Relaying: An Adaptive Approach to a System Protection Problem," University of Pennsylvania, Mar. 1974.
M. S. Sachdev, et al., "A Technique For Estimating Transmission Line Fault Locations From Digital Relay Measurements," IEEE Transactions on Power Delivery.
Adly A. Girgis et al, "A New Fault Location Technique For Two-and Three-Terminal Lines," IEEE Transactions on Power Delivery, vol. 7, No. 1, Jan. 1992, pp. 98-107.
ABB Power T & D Company Inc.
Assouad Patrick J.
Ramirez Ellis B.
LandOfFree
Automatic fault location system does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Automatic fault location system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Automatic fault location system will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1081660