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Method to estimate the lightning multiline flashover on transmission line towers

Journal Article · · Electr. Eng. Jpn. (Engl. Transl.); (United States)
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Most transmission line faults are caused by lightning. In Japan under ordinary circumstances, two circuits of transmission lines are strung on one tower due to the limited right of way. Therefore it is not rare that the two circuits break down simultaneously. Since the simultaneous two-circuit fault has a very serious effect on the security of power systems, it is very important to predict accurately the probability of multiline flashover. Much useful data have already been accumulated about the potential distribution of the transmission tower subject to lightning stroke. These data are used to analyze the mechanism of multiline flashover, and a tower potential rise method (abbreviated as TPR method) for the analysis of multiline flashover phenomena is proposed. In this method, it is possible to take into account the surge impedances of the transmission line and transmission tower and the coupling factor between the power line and ground wire, as well as the potential distribution of the transmission tower. In the proposed method, the conventional formulas for lightning stroke current and the frequency distribution curve of lightning stroke current, which have been used widely so far in designing the insulation level of the transmission line, are used. Hence, it is possible to calculate the multiline flashover probability without modifying the basic principle of conventional insulation design procedures.

Research Organization:
Chubu Electric Power Co., Inc., Nagoya, Japan
OSTI ID:
5320745
Journal Information:
Electr. Eng. Jpn. (Engl. Transl.); (United States), Journal Name: Electr. Eng. Jpn. (Engl. Transl.); (United States) Vol. 97:1; ISSN EENJA
Country of Publication:
United States
Language:
English

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Related Subjects

200301* -- Power Transmission & Distribution-- AC Systems
EHV & UHV-- (-1989)
24 POWER TRANSMISSION AND DISTRIBUTION
AC SYSTEMS
BREAKDOWN
CALCULATION METHODS
CURRENTS
EHV AC SYSTEMS
ELECTRIC CURRENTS
ELECTRIC DISCHARGES
ELECTRICAL FAULTS
ELECTRICAL INSULATION
FLASHOVER
LIGHTNING
MECHANICAL STRUCTURES
POWER SYSTEMS
POWER TRANSMISSION LINES
POWER TRANSMISSION TOWERS
SURGES