GROUNDING ACCIDENT DETECTOR AND GROUNDING ACCIDENT DETECTION METHOD

PROBLEM TO BE SOLVED: To specify a section where a grounding accident is generated in a power transmission and distribution line with a large number of branched cables having a plurality of lines, by an inexpensive means. SOLUTION: This grounding accident detector has current measuring means 61a, 61...

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Bibliographische Detailangaben
Hauptverfasser:	SHOJI YUICHI, TAKEMOTO MASARU, NAKAGAWA TOSHIHARU, MATSUNO KAZUJI, UMEHARA NOBORU, SUZUKI KENICHI
Format:	Patent
Sprache:	eng
Schlagworte:	CONVERSION OR DISTRIBUTION OF ELECTRIC POWER ELECTRICITY EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS GENERATION INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ONOTHER TECHNOLOGY AREAS MEASURING MEASURING ELECTRIC VARIABLES MEASURING MAGNETIC VARIABLES PHYSICS SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORKOPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FORIMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION,DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS TESTING
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To specify a section where a grounding accident is generated in a power transmission and distribution line with a large number of branched cables having a plurality of lines, by an inexpensive means. SOLUTION: This grounding accident detector has current measuring means 61a, 61b, 61c for measuring currents IA, IB, IC flowing between a metal shielding layer in a usual connection part and the earth, a reference value holding means 62 for storing a grounding current reference value Iset, absolute value computing means 63a, 63b, 63c input with the currents IA, IB, IC, and for finding absolute values ¾IA-IB¾, ¾IB-IC¾, ¾IC=IA¾ of differences between the two currents out of them to be output, comparison-computing means 64a, 64b, 64c for comparing each of the absolute values ¾IA-IB¾, ¾IB-IC¾, ¾IC=IA¾ with the grounding current reference value Iset to output an ON-signal when equal or larger, in the each, and a logical sum computing means 65 input with outputs from the comparison-computing means to output a logical sum. COPYRIGHT: (C)2005,JPO&NCIPI