報告書番号

U97015

タイトル（和文）

費用便益分析による変電設備の耐震補強計画

タイトル（英文）

SESIMIC RETROFIT PLANNING METHOD FOR SUBSTATION COMPONENTS BASED ON COST BENEFIT ANALYSIS

概要 （図表や脚注は「報告書全文」に掲載しております）

日本においては，１９８０年に変電機器の耐震設計指針が改訂された一方で，最新の設計基準に準拠しない変電機器がいまだに数多く残されている。そのような変電機器を最新の耐震基準のもとに設計された機器に取り替えたり，耐震補強するためには莫大な費用が必要となる。上記の理由から本研究では，費用便益分析に基づく変電設備の耐震補強計画法を提案した。まず，費用便益分析の解析ステップについて述べ，耐震補強コスト（ＲｅｔｒｏｆｉｔＣｏｓｔ）とある想定地震に対する企業損失コスト（ＣｏｍｐａｎｙＬｏｓｓ）の評価モデルを構築した。つぎに，北海道釧路地域に存在する実際の２次系統に本手法を適用し，本論で提案した変電設備の耐震補強計画法の有効性を例示した。最後に，同系統の断路器および■断器を対象とする耐震補強計画について，費用便益の視点から考察した。

概要 （英文）

IN JAPAN, ALTHOUGH SEISMIC DESIGN CRITERIA FOR NEW SUBSTATION COMPONENTS HAVE BEEN IMPROVED SINCE 1980, MANY EXISTING COMPONENTS HAVE NOT BEEN REPLACED OR RETROFITTED BECAUSE OF THE HIGHCOSTS. THEREFORE, IF AN EARTHQUAKE OCCURRS, DAMAGE TO ELECTRIC POWER TRANSMISSION SYSTEMS WILL BE CONCENTRATED IN NON-UPGRADED COMPONENTS. THE PURPOSE OF THIS STUDY IS TO DEVELOP A SESMIC RETROFIT PLANNING METHODFOR SUBSTATION COMPONENTS ON THE BASIS OF A COST BENEFIT ANALYSIS. IN THE COST BENEFIT ANALYSIS, THE SEISMIC RETROFIT COST OF SUBSTATION COMPONENTS AND THE COMPANY LOSS, WHICH INCLUDES THE CAPITAL LOSS AND THE REVENUE LOSS DUE TO THE SEISMIC POWER LOSS, ARE ESTIMATED. THE PROPOSED METHOD CONSISTS OF THREE STEPS. THE FIRST STEP (STEP1) IS A PROCESS FOR DETERMINING THE SEISMIC DAMAGE PROBABILITY OF EACH COMPONENT USING VULNERABILITY FUNCTIONS FOR ESTIMATING THE EXPECTED POWER LOSS OF ELECTRIC POWER TRANSMISSION SYSTEMS, CONSISTING OF THE SUBSTATION COMPONENTS WHICH HAVE THE SEISMIC DAMAGE PROBABILITIES DEFINED BY STEP1. THE THIRD STEP (STEP3) PROPOSES AN OPTIMUM SEISMIC RETROFIT PLAN. IN THIS THIRD STEP, THE SEISMIC RETROFIT COST AND THE COMPANY LOSS ARE ESTIMATED EXPLICITY TO FIND THE OPTIMUM POINT MINIMIZING THE SEISMIC TOTAL COST INCLUDING THE RETROFIT COST AND THE COMPANY LOSS. FINALLY, THE PROPOSED METHOD WAS APPLIED TO A SECONDARY SYSTEM LOCATED IN KUSHIRO HOKKAIDO, JAPAN. THE OPTIMUM SEISMIC RETROFIT PLANS FOR LINE SWITCHES AND CIRCUIT BREAKERS IN THE REAL SECONDARY SYSTEM ARE STUDIED ON THE BASIS OF THE COST BENEFIT ANALYSIS.

報告者

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