@article{oai:ir.kagoshima-u.ac.jp:00004627,
 author = {川畑, 秋馬 and KAWABATA, Shuma and 入佐, 俊幸 and IRISA, Toshiyuki and 上妻, 生朗 and KOZUMA, Ikuro},
 journal = {鹿児島大学工学部研究報告, The research reports of the Faculty of Engineering, Kagoshima University},
 month = {Sep},
 note = {Distribution line difficulties have occurred in the areas having heavy ash fall. We investigate how distribution line difficulties depend on an increase of the leakage current of the insulators
caused by the volcanic ash fall. Methods for eliminating these problems are examined. The
results of this inquiry are summarized as follows.
(1) When the volcanic ash accumulates in the ribs within the insulators and becomes wet by rain, such as drizzle, the leakage current increases owing to the weakening of the insulator resistance of the insulator,
besides involving the generation of a corona. Fluctuations of the leakage current also become larger.
(2) The volcanic ash fall increases the leakage current in the case of the strain insulator, the high voltage cut-out base and the arrester but little leakage occurs in the case of the pin insulator．
(3) A combination of the strain insulator with the anti-pollution insulator restrains the generation of a corona,
even if the insulators are polluted by the volcanic ash fall. This combination
enables us to limit the fluctuations of the zero-phase-sequence voltage and to diminish the service interruption problems caused by the operation of the circuit breaker.
(4) The observation of a corona makes us presuppose that the potential gradient in the ribs of the strain insulator is large. Accordingly, it follows that in order to decrease leakage currents, the strain insulator should be lengthened in the inner-cylinder within the insulator, as well
as in the anti-pollution insulator.
(5) For contamination countermeasures, it is necessary to take into account not only the electric conductivity and the quantity of the volcanic ash but also their viscosity.},
 pages = {65--71},
 title = {桜島火山降灰の配電線路への影響},
 volume = {36},
 year = {1994}
}