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Characteristics of lightning surges observed at 77 kV substations
Author(s) -
Ueda Toshiaki,
Yoda Masayuki,
Miyachi Iwao
Publication year - 1998
Publication title -
electrical engineering in japan
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.136
H-Index - 28
eISSN - 1520-6416
pISSN - 0424-7760
DOI - 10.1002/eej.4391240305
Subject(s) - surge , electrical engineering , lightning arrester , engineering , arc flash , lightning (connector) , ground , voltage , surge arrester , overvoltage , electric power transmission , impulse (physics) , transmission line , lightning strike , power (physics) , physics , quantum mechanics
In order to improve power supply reliability, it is necessary to prevent lightning faults in transmission lines and substation apparatus. However, faults are caused occasionally in lower‐voltage power systems, particularly at the 77 kV level. The governing factor for insulation strength of substation apparatus is the lightning impulse voltage, and it is necessary to know the voltage level and distribution in a substation caused by lightning surges in order to investigate rational insulation coordination. For this purpose, the authors measured lightning surges at two 77 kV conventional substations from 1990 to 1993. In this paper, the characteristics of induced lightning surges and back flashover lightning surges are described. Comparisons of related surge voltages at two substations, the power line phases in grounding faults, and the equivalent capacitance of the substations are also discussed.