超電導送電システムにおけるクエンチ電流レベル協調の提案

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  • Quenching Current Level Coordination in Superconducting Power Transmission System
  • チョウデンドウ ソウデン システム ニ オケル クエンチ デンリュウ レベル

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In the present power transmission system, electric power devices are equipped under a conception of the insulation coordination and are protected from the over-voltage of the lightning and switching surge by the arrester. However, a future superconducting power transmission system is characterized by the heavy current transmission capability, the lower transmission loss and lightning-surge-free circumstances. Thus, in the superconducting power transmission system, superconducting devices should be protected rather from quenching by the over-current of a short-circuit fault than from the breakdown by over-voltage.<br>In this paper, a new conception of the coordination for the superconducting transmission system is proposed as a “quenching current level coordination” instead of the insulation coordination. Furthermore, it is pointed out that the quenching current level coordination has the duality relationship with the present insulation coordination. A superconducting fault currant limiter should play an important part of the quenching current level coordination to prevent the other superconducting devices from quenching.

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