In recent years, voltage dips are one of the important issues related to power quality problems. The electric power company is required to identify a position when the fault occurred and the influence of the fault promptly when the accident occurs in the power line, and to offer the customer information adequately.rnThen, in this paper the technique for efficiently presuming the voltage reduction on all the customer points in the system by using this in each observation point on the assumption of the measurement voltage at voltage dip is proposed.%近年、情報化の進展やハイテク機器の普及によrnり、雷を主因とするわずかな時間の電圧低下(以rn下瞬低)に敏感な機器が増えており、影響軽減がrn大きな課題となっている。影響軽減対策のためにrnは、まず需要家が瞬低を受ける程度を把握する必rn要があるが、現状、全ての需要家でそれらが観測rnされてはいない状況にある。
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