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Irregular loops with long time constants in CIC conductor

Yagai, Tsuyoshi*; Sato, Hidenari*; Tsuda, Makoto*; Hamajima, Takataro*; Nunoya, Yoshihiko; Takahashi, Yoshikazu; Okuno, Kiyoshi

AC losses in the CIC conductor consist of both regular loss that are proportional to cable twisting pitch squared and irregular loss that could not be estimated from short conductor sample results. It was explained from our previous works that irregular loops produce the losses with long time constants up to several hundred seconds. The observed long time constant indicates that contact conditions between the two strands forming the loop should be line contact. We traced the sample conductor with 1 m in length. The measured results show that large displacements of strands from their original positions due to compressing the conductor provide many line contacts. It is found that the averaged line contact length reaches about 10 mm that is three orders of magnitude larger than the 0.01 mm of point contact length.

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Category:Engineering, Electrical & Electronic

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