POLYPHASE POWER CABLE AND TUNNEL EXCAVATING SYSTEM PROVIDED WITH SAME

PROBLEM TO BE SOLVED: To provide a polyphase power cable capable of reducing grounding phase potential generated in a grounding electric wire. SOLUTION: A voltage electric wire 11R of phase R, a voltage electric wire 11S of phase S, and a voltage electric wire 11T of phase T are brought into contact...

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Bibliographic Details
Main Author KAWADA KATSUYUKI
Format Patent
LanguageEnglish
Published 14.11.2000
Edition7
Subjects
BASIC ELECTRIC ELEMENTS
CABLES
CONDUCTORS
EARTH DRILLING
EARTH DRILLING, e.g. DEEP DRILLING
ELECTRICITY
FIXED CONSTRUCTIONS
INSULATORS
MINING
OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR ASLURRY OF MINERALS FROM WELLS
SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING ORDIELECTRIC PROPERTIES
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Summary:PROBLEM TO BE SOLVED: To provide a polyphase power cable capable of reducing grounding phase potential generated in a grounding electric wire. SOLUTION: A voltage electric wire 11R of phase R, a voltage electric wire 11S of phase S, and a voltage electric wire 11T of phase T are brought into contact with each other on each of outer circumferences so that lines linking each of centers of the voltage electric wires form a regular triangle 16. A grounding electric wire 11E1 is so arranged that its outer circumference is in contact exactly with outer sides of the voltage electric wires 11R, 11S. A grounding electric wire 11E2 is so arranged that an outer circumference is in contact exactly with outer sides of the voltage electric wire 11S, 11T. A grounding electric wire 11E3 is so arranged that an outer circumference is in contact exactly with outer sides of the voltage electric wires 11T, 11R. Lines linking each of centers of the grounding electric wires 11E1, 11E2, and 11E3 form a regular triangle 17.
Bibliography:Application Number: JP19990125868