報告書番号

185029

タイトル（和文）

直流イオン流に及ぼす導体表面の影響（その３）－双極水平配列における新旧線の比較－

タイトル（英文）

INFLUENCE OF CONDUCTOR SURFACE CONDITION ON ION FLOW IN HVDC TRANSMISSION LINES (PART3) -COMPARISON BETWEEN WEATHERED CONDUCTORS AND NEW ONES UNDER BIPOLAR HORIZONTAL ARRANGEMENT-

概要 （図表や脚注は「報告書全文」に掲載しております）

直流送電線のイオン流帯電現象およびコロナ特性に与える電線表面状態の影響について，当所横須賀研究所の直流試験線の約７年間の長期課電暴露電線（旧線）を用いて，双極課電における新線と旧線の同時比較試験を行ったところ主に次の結果が得られた。（１）旧線のコロナ電流は課電初期の新線により１～３割大きい程度であり，新線のコロナ電流は１～２か月という短期間で旧線に近づく。（２）この相違は単極の場合より小さく，この原因は最大導体表面電位の傾きとコロナ開始電界との差で説明できる。（３）正コロナ電流の方が負コロナ電流より新線と旧線の相違がいくらか大きい。これは双極の場合，正極性電線の方が極端に汚れ易いためである。さらに人工汚損電線による小規模モデル実験を行い，双極の場合は単極程汚損の影響をうけないことを確認した。

概要 （英文）

IN RELATION TO THE INFLUENCE OF THE CONDUCTOR SURFACE CONDITION ON ION FLOW ELECTRIFICATION PHENOMENA AND CORONA CHARACTERISTICS, THE LONG-TERM COMPARATIVE EXPERIMENT BETWEEN A NEW CONDUCTOR AND A WEATHERED ONE HAS BEEN CARRIED OUT UNDER THE BIPOLAR ARRANGEMENT. THE WEATHERED CONDUCTOR HAD BEEN ENERGIZED FOR ABOUT 7 YEARS AT CRIEPI S TAKEYAMA HVDC TEST LINE. TAKEYAMA HVDC TEST LINE IS CHANGED TO TWO SIMPLE SPANS. A NEW CONDUCTOR IS STRETCHED ON THE EAST SIDE OF THE SPANS, AND THE WEATHERED ONE IS ON THE OTHER SIDE. BOTH CONDUCTORS ARE SUPPLIED WITH +-250KV VOLTAGE AT THE SAME TIME IN ORDER TO COMPARE CORONA CURRENTS OF THEM UNDER THE SAME CONDITION SIMULTANEOUSLY. MAIN RESULTS ARE AS FOLLOWS. (1)CORONA CURRENT OF THE WEATHERED CONDUCTOR IS SOMEWHAT LARGER TEN-THIRTY PERCENT THAN THAT OF A NEW ONE, AND CORONA CURRENT OF A NEW CONDUCTOR REACHES THE LEVEL OF THAT OF A WEATHERED ONE AFTER SHORT PERIODS OF 1-2 MONTHS.(2)THIS DIFFERENCE IS LESS THAN THAT OF MONOPOLAR ARRANGEMENT, WHICH CAN BE EXPLAINED BY THE DIFFERENCE BETWEEN CORONA ONSET GRADIENT AND MAXIMUM CONDUCTOR SURFACE GRADIENT. (3)THE DIFFERENCE OF POSITIVE CORONA CURRENT BETWEEN THE WEATHERED CONDUCTOR ANDA NEW ONE IS SLIGHTLY LARGER THAN THAT OF THE NEGATIVE ONE BECAUSE THEPOSITIVE CONDUCTOR IS EXTREMELY MORE POLLUTED THAN THE NEGATIVE ONE INTHE BIPOLAR ARRANGEMENT. MOREOVER, IT BECOMES ALSO CLEAR FROM THE ARTIFICIALLY CONTAMINATED EXPERIMENT THAT THE EFFECT OF CONTAMINATION IS SMALLER UNDER THE BIPOLAR ARRAGEMENT THAN UNDER THE MONOPOLAR ARRANGEMENT.

報告者

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