報告書番号

T86008

タイトル（和文）

ＵＨＶ赤城実規模試験線の動的試験－強風時の風応答観測－

タイトル（英文）

DYNAMIC TESTS ON U.H.V. AKAGI TEST TRANSMISSION LINE -AERODYNAMIC RESPONSE OF STRONG GUSTS-

概要 （図表や脚注は「報告書全文」に掲載しております）

わが国の電力需要の伸びは着実な増加が見込まれる一方，電源の遠隔化，大容量化に伴い，ＵＨＶ送電の実用化が計画されている。当所においても，わが国の地域環境条件に適合した交流１０００ｋＶ級２回線試験送電線（鉄塔３基，２径間連成系）を赤城試験センターに建設し，機械的安全性，環境対策などの検討を重点に実証研究が行われてきた。本報告は，強風を対象とした風応答観測を行い，強風特性，連成系の応答性状および現行設計手法（ＪＥＣ・１２７－１９７９）の妥当性について述べたものである。

概要 （英文）

THIS PAPER DEALS WITH AERODYNAMIC RESPONSE OF STRONG GUSTS ON THE U.H.V.AKAGI TEST LINES (CONSISTED OF THREE-TOWER,TWO-SPANS TOTAL SYSTEM) AND ADEQUACY OF JEC-127(1979) AGAINST WIND LOADS. MAIN RESULTS ARE AS FOLLOWS. 1.THE WIND SPEED VARIES WITH HIGHT ACCORDING TO POWER LAW AND THE PROFILS SHAPE DEPENDS ON THE AVERAGING TIMEAND TERRAIN ROUGHNESS. BASED ON THE OBSERVATION, FOLLOWING RALATIONS HAVE BEEN DERIVED.UH=U･(H/10)0.2(FOR MEAN WIND SPEED) UH=U･(H/10)0.1(FORGUST WIND SPEED) WHERE UH:THE WIND SPEED AT H(M) ABOVE GROUND. 2.POWER-SPECTRUM OF FLUCTHATION OF WIND SPEED COULD BE APPROXIMATED BY DVENPORT EXPERIMENTAL EQUATION. 3.THE FLUCTUATION COMPONENTS OF STRESS OF MAINLEG MEMBER HAD APPROXIMATELY SAME FREQUENCIES AS NATURAL FREQUENCIES OF TOWER OSCILLATION AND AMPLIFICATION DUE TO RESONANSE WERE NOT OBSERVED. 4.BASED ON THE DERIVED RELATION BETWEEN GUST WIND SPEED STRESS OF MAIN LEG MEMBER, STRESS OF NO2 WERE CALCULATED FOR GUST WIND SPEED OF 39.2M/SEC. THAT IS THE EXPECTED MAXIMUM GUST WIND SPEED OF THE AKAGI REGION, AND STRESS OF 627.7TON WERE ESTIMATED. THIS STRESS IS WELL BELOW THECALCULATED STREES BASED ON THE PROCEDURE NECOMMENDED IN JEC-127(1979),AND IT APPERED THAT THE ACCEPTABILITY OF JEC-127(1979) ARE VERIFIED.

報告者

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