Quench Protection System based on Active Power Method

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  • Nanato Nozomu
    Division of Industrial Innovation Sciences, Graduate School of Natural Science and Technology, Okayama University

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Other Title
  • 有効電力法による超電導コイルのクエンチ保護システム
  • 有効電力法による超電導コイルのクエンチ保護システム--相互誘導電圧除去による特性改善法
  • ユウコウ デンリョクホウ ニ ヨル チョウデンドウ コイル ノ クエンチ ホゴ システム ソウゴ ユウドウ デンアツ ジョキョ ニ ヨル トクセイ カイゼンホウ
  • —相互誘導電圧除去による特性改善法—
  • —A Method for Improving the Characteristics of Active Power Method by Cancelling Mutual Inductive Voltage—

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Abstract

In superconducting coils, local and excessive joule heating may give damage to the superconducting windings when a quench occurs and therefore it is essential that the quench is detected quickly and precisely so that the coils can be safely discharged. We have presented a quench protection system based on the active power method which detects a quench by measuring the instantaneous active power generated in a superconducting coil. The protection system based on this method is strong against the inductive voltage and noise which may cause insufficient quench recognition. However, the proposed system is useful for a single coil but it is vulnerable to the magnetically coupled multi-coil such as high field superconducting coils. Because the proposed system can not avoid insufficient quench recognition by the mutual inductive voltage from the other coils. This paper presents a method to improve the characteristics of the active power method by cancelling the mutual inductive voltage. The experimental results of the quench protection for small Bi2223 coils show that the proposed system is useful for the magnetically coupled coils.

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