報告書番号

186002

タイトル（和文）

送電線のラジオ雑音伝搬の解析－不均一線路の計算法－

タイトル（英文）

ANALYSIS OF RADIO INTERFREENCE WAVE PROPAGATION IN TRANSMISSION LINES -COMPUTATIONAL METHOD FOR NON UNIFORM LINES-

概要 （図表や脚注は「報告書全文」に掲載しております）

交流および直流送電線のラジオ雑音レベルは，試験線やコロナケージにおける測定値を長い送電線の条件に換算することにより予測がなされている。しかし，従来は架空地線など一部の電線が鉄塔において接地されている送電線や，線路の途中で導体方式が変るような送電線などの不均一線路を含めた任意の線路を対象とした解析手法は開発されていなかった。本報告は，このような任意の線路におけるラジオ雑音の伝搬の解析のために新たに開発した計算法について述べたものである。本計算法では計算時間が課題となるのを防ぐため，計算手順および収束判定条件等について工夫している。本計算法をＵＨＶ赤城試験線および旧塩原試験線における実測条件に適用したところ測定値とよく一致し，本計算法がラジオ雑音特性の解析に有効であることが確認された。この手法を用いると試験線やケージで得られる任意の実用線の雑音レベルが予測できる。

概要 （英文）

RADIO INTERFERENCE FIELDS OF AC OR DC POWER TRANSMISSION LINE HAVE BEEN PREDICTED BY CONVERTING MEASURED RI FIELDS ON A SHORT TEST LINE OR MEASURED RI VOLTAGE IN A CORONA CAGE. SEVERAL ANALYTICAL METHODS HAVE BEEN PROPOSED TO CALCULATE RADIO FREQUENCY WAVE PROPAGATION IN A SHORT TEST LINE OR IN A LONG LINE, BUT MOST OF THESE METHODS CANNOT BE APPLIED TO NONUNIFORM LINES, WHICH INCLUDE THE FOLLOWING CASES, FOR EXAMPLE ; (1)SOME CONDUCTORS SUCH AS GROUNDING WIRES ARE GROUNDED AT EACH TOWER. (2)CONDUCTOR ARRANGEMENTS DIFFER WITH EACH SPANOF THE TRANSMISSION LINE. THIS REPORT DESCRIBES A NEW COMPUTATIONAL METHOD FOR THE ANALYSIS OF RADIO INTERFERENCE WAVE PROPAGATION IN ARBITRARY TRANSMISSION LINES INCLUDING NONUNIFORM LINES. IN THIS METHOD, SOME COMPUTATIONAL PROCEDURES AND CONVERGENCE CRITERIA ARE CONSIDERED IN ORDER TO SAVE COMPUTING TIME. THIS PROPOSED METHOD IS APPLIED TO THE ACTUAL TEST CONDITION ON A SHORT TEST LINE HAVING CORONA NOISE SOURCES OR A GAP NOISE SOURCE, AND THE CALCULATED VALUES ARE COMPARED WITH THE MEASURED ONES. RI LEVELS CALCULATED BASED ON DATA OBTAINED BY CORONA CAGE TESTS ARE IN GOOD AGREEMENT WITH THE MEASURED RI FIELD OF THE UHV AKAGI TEST LINE. RI LEVELS GENERATED BY GAP DISCHARGES ARE ALSO CALCULATED BASED ON MEASURED DATA OF RIV, AND CALCULATED VALUES OF RI FIELD AGREE WELL WITH THE MEASURED ONES ON THE PREVIOUS SHIOBARA TEST LINE. FROM THE ABOVE RESULTS, THE PROPOSED METHOD IS CONFIRMED TO BE VALID FOR THE ANALYSIS OF RADIO INTERFERENCE WAVE PROPAGATION AND RI FIELD CHARACTERISTICS. BY USING THIS METHOD, RI LEVELS (ELCTRIC OR MAGNETIC FIELD) OF A GIVEN PRACTICAL LINE CAN BE PREDICTED BASED ON MEASURED DATA OF RI FIELD OBTAINED ON A TEST LINE OR DATA OF RI VOLTAGE OBTAINED IN A CORONA CAGE.

報告者

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