報告書番号

180023

タイトル（和文）

限流しや断装置の基礎特性（第３報）－水冷帯エレメントの最小溶断電流と冷却パラメータとの関係

タイトル（英文）

BASIC PROPERTIES OF CURRENT LIMITING INTERRUPTERS (3) -MINIMUM FUSING CURRENTS OF BAND ELEMENTS WITH FORCED WATER COOLING AND ITS AFFECTING COOLING PARAMETERS-

概要 （図表や脚注は「報告書全文」に掲載しております）

直流および交流しゃ断器の一種として，高速度で動作する限流しゃ断装置を開発した。通電部に水冷帯エレメントを採用することを提案し，当該エレメントの最小溶断電流と冷却パラメータとの関係を検討した。測定条件：冷却管内径２～７ｍｍ，帯材銀，板幅ａ，板厚ｂ＝０．０２５～０．１ｍｍ，長さＬ＝２０５ｍｍ，冷却水速度Ｖｗ＝０．５～２ｍ／Ｓ．帯エレメントの最小溶断電流Ｉｍ（Ａ）＝Ｉｍｏ（Ａ）×ａ（ｍｍ）×〔ｂ（ｍｍ）の平方根〕×Ｖｗ（ｍ／ｓ）の０．３９乗。ここに，特性値Ｉｍｏは冷却管内径（ｍｍ）／ａ（ｍｍ）の平方値：換算冷却管内径の関数で表示できる。同一帯エレメントにおいて，冷却水中の最小溶断電流は静止大気中のそれの１５～２５倍と大幅に増大する。

概要 （英文）

A NEW TYPE OF A FAST-ACTING CURRENT LIMITINGINTERRUPTER WITH A WATER-COOLED BAND FUSING ELEMENT WAS STUDIED AS ONEMEASURE OF SHORT-CIRCUIT CURRENT PROTECTION FOR SEMI-CONDUCTORS USED IN AC-DC SUBSTATIONS. THE FUSING ELEMENT OF SILVER IS SETTLED HORIZONTALLY IN A COOLING TUBE AND ITS SURFACE IS DIRECTLY FORCED-COOLED BY A HIGH-SPEED COOLING WATER. THE MINIMUM FUSING CURRENTS IM OF THE ELEMENTS WERE MEASURED IN A COOLING TUBE WITH PARAMETERS OF THE BAND WIDTH A FROM2 TO 4MM,BAND THICKNESS B FROM 0.025 TO 0.1MM,BAND LENGTH OF 205MM,THEINNER DIAMETER OF COOLING TUBE DK FROM 2.4 TO 7.5MM AND THE VELOCITY OF COOLING WATER VW FROM 0.5 TO 2M/S. (1)IM OF ELEMENTS WITH VERTICAL ELEMENT SURFACE AND IM OF ELEMENTS WITH HORIZONTAL ONE ARE FAIRLY SAME ATTHE WATER VELOCITY OF 2M/S,BUT THE LATTER IS ABOUT 10% SMALLER THAN THE FORMER AT WATER VELOCITY OF 0.5M/S. (2)IM OF ELEMENTS IN DIFFERENT COOLING TUBES IS WRITTEN AS A FUNCTION OF A MODIFIED COOLING TUBE INNER DIAMERTER DK*=DK/SQUARE ROOT OF A (MM). (3)IM OF ELEMENTS SETTLED BARELYIN CONVENTIONAL AIR,IM.L,WAS MEASURED AS FOLLOWS: IM.L(A)=49.7XA(MM)TO0.73TH X SQUARE ROOT OF B(MM). IM OF ELEMENTS WITH WATER COOLING IS ABOUT 15 TO 25 TIMES OF THAT IN CONVENTIONAL AIR.

報告者

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