瞬時動作形低圧ヒューズの開発

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  • Development of a Quick-Acting Type Fuses for Protection of Low Voltage Distribution Lines
  • シュンジ ドウサケイ テイアツ ヒューズ ノ カイハツ

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A short-circuit fault current in a low voltage distribution line from a branch point to a house is usually reduced with time by increasing resistance of conductors due to temperature rise and also by arc voltage.<br>Bacause of features mentioned above, the operating time of conventional fuses may be remarkably prolonged. In order to eliminate that defect a bypass type of the quick-acting fuse has been developed.<br>The main results are as follows:<br>(1) A bypass type of the quick-acting fuses short-circuits the fault line at the branch point by utilizing the large electro-magnetic force due to the fault current.<br>(2) In order to protect almost low voltage distribution lines the minimum operating current of the fuses is settled to be 1, 000 A.<br>(3) The bypassing time of the fault line by the newly developed fuse is only 6ms and 10ms in case of a fault current of 2kA in the metallic contacting faults, and the arc short-circuit faults, respectively, those being about 1/100 in comparison with the operating time of the conventional fuses.<br>(4) The operating time of the new fuses is 140ms in case of the same fault current in the metallic contacting fault, which is only about 1/4 of that of the conventional fuses.

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