経年ガス絶縁機器の絶縁試験によるリプレース時期延伸の可能性

概要

論文の詳細を見る
With the urgent need for cost reduction in electric power equipment, investment in equipment will be controlled and the number of aged equipment will increase in the future. Moreover, it is requested that aged equipment should be used to the utmost limit by postponing the replacement to as late a date as possible. At this time, it is important to discuss how we can evaluate and guarantee the residual lifetime of equipment. As a method of replacement postponement, there is an alternative possibility of guaranteeing the lifetime by executing an insulation test on the aged equipment again.The present standards of AC insulation tests for high voltage power equipment in Japan are based on the reliability evaluation according to the Weibull distribution assumed as fault occurrence probability of the equipment. The present evaluation is not considered a proper one as it doesnt take into account non-accidental change of the equipment with time. One of the authors has pointed out this problem in a recent paper.In this paper, we investigated long-time V-t characteristics and the meaning of AC insulation tests for gas-insulated power equipment. Furthermore, we discuss the fault probability when two different levels (waveform or value) of voltage are applied to equipment. Finally, we investigate the feasibility to replacement postponement by executing the insulation test on the aged equipment again.
社団法人電気学会の論文
2006-07-01