報告書番号

380060

タイトル（和文）

変電設備耐震対策の研究－変電設備耐震設計用地震動－

タイトル（英文）

A STUDY ON THE COUNTERPLANE FOR ELECTRIC FACILITIES IN TRANSFORMER SUBSTATIONS AGAINST EARTHQUAKES -DESIGN EARTHQUAKE MOTIONS-

概要 （図表や脚注は「報告書全文」に掲載しております）

１９７８年宮城県沖地震は超高圧変電所に多大の被害を与えたため電事連内に耐震対策特別委員会が設置された。本報告は上記耐震対策の基本となる設計地震動を策定したものである。全国の主要変電所２１０個所を選定して観測点とし，宇佐美リスト掲載の全被害地震５３５個所を電源として，岡本式に基づいて基盤加速度マップを作成した。また主要変電所３１個所について有名地震波形１１波による表層地盤の地震動増幅率を求めた。変電所地点が日本全国任意地点にあり得ると仮定し，上記マップのあるレベル以上の加速度のコンターの何処に位置するかを確率事象と見なし，表層増幅率との積で与えられる地表加速度が３００ガルを越える確率を求めると１．７５％未満となり地表面での設計加速度の最大値を３００ガルとすることの妥当性を認めた。

概要 （英文）

MIYAGIKENOKI EARTHQUAKE OCCURRED ON JUNE 12ND IN 1978, IN THE FIELD OF ELECTRIC POWER FACILITIES,IMPORTANT TRANSFORMER SUBSTATIONS WERE DAMAGED.ESPECIALLY,DAMAGES IN PROCELAIN INSULATORES ON SOFT GROUND WERE SERIOUS.THE SUBSTATION MOST SERIOUSLY DAMAGED IS LOCATED ON THE HILL SIDE WITH CUTTING AND BANKING SPACE. TAKING WARNINGBY THESE DAMAGES,A SPECIAL COMMITEE ON COUNTERPLAN FOR THE EARTHQUAKE-PROOF OF ELECTRIC FACILITIES WERE ORGANIZED IN THE FEDERATION OF ELECTRIC ENTERPRISE COMPANIES IN ORDER TO CLARIFY CAUSES OF ABOVE DAMAGES ANDTO MAKE ALL THE COUNTERPLANS AGAINST EARTHQUAKE DAMAGES. IN THIS PAPER,THE DESIGN EARTHQUAKE MOTION FOR THE ELECTRIC FACILITIES IN TRANSFORMER SUBSTATIONS WHICH IS THE BASE IN MAKING THE COUNTERPLAN AND WAS INVESTIGATED THROUGH THE ACTIVITIES OF ABOVE COMMITTEE WILL BE DISCUSSED AND PROPOSED AFTER VERIFICATION OF ITS VALIDITY. THE RESULTS OBTAINED AREAS FOLLOWS.(1)FROM THE SEISMIC MAP OF 75 YEARS IN RECURRENCE YEAR TO 210 MAIN TRANSFORMER SUBSTATIONS BASED ON OKAMITO S EMPIRICAL FORMULA AND THE MAGNIFICATION FACTORS OF THE ACCELERATIONS OF 31 SUBSTATION SUBLAYERS, THE APPROXIMATE VALUE OF THE PROBABILITY EXCESSING 300 GAL AT THEGROUND SUFACE IS SHOWN TO BE VERY SMALL SUCH AS UNDER 1.75%.(2) INPUT MOTION OF TWO-CYCLES RESONANT SINUSOIDAL WAVE WHICH IS TWO CYCLES OF SINUSOIDAL WAVE THAT HAVE A NATURAL FREQUENCY OF EQUIPMENT,IS CONSIDEREDAPPROPRIATE AS DESIGN EARTHQUAKE MOTION ON SUBSTATION GROUND SURFACES AS THE RESULTS FROM THE COMPARISON OF THE RESPONSE VALUES AGINST THE TWO-CYCLES RESONANT SINUSOIDAL INPUT AND THE EARTHQUAKE MOTIONS.

報告者

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