Quench time lag and its statistical characteristics of NbTi mechanical PCS measured with pulsed current

Junya Suehiro; Daisuke Tsuji; Koichi Tsutsumi; Shinya Ohtsuka; Masanori Hara

doi:10.1109/77.783496

Quench time lag and its statistical characteristics of NbTi mechanical PCS measured with pulsed current

Junya Suehiro, Daisuke Tsuji, Koichi Tsutsumi, Shinya Ohtsuka, Masanori Hara

Applied Energy Engineering

Research output: Contribution to journal › Article › peer-review

1 Citation (Scopus)

Abstract

This paper describes quench time lag characteristics of NbTi mechanical PCS through which pulsed current flows. The quench of the mechanical PCS takes place when the switch current is slowly increased and exceeds a critical value I_T0. On the other hand, quench of the PCS through which pulsed current flows does not occur at the moment of the instantaneous current exceeding I_T0, but takes place after a time delay T_D. The quench time lag T_D depends on rise time and peak value of the pulsed current I_P. A theoretical model is proposed to show that T_D corresponds to time in which superconducting connection bridge is heated up to a critical temperature mainly by flux flow loss. T_D sharply fluctuates when I_P is just over the static critical current I_T0, but remarkably decreases when I_P is further increased. It is found that statistical characteristics of T_D are well fitted to Weibull distribution function.

Original language	English
Pages (from-to)	1125-1128
Number of pages	4
Journal	IEEE Transactions on Applied Superconductivity
Volume	9
Issue number	2 PART 1
DOIs	https://doi.org/10.1109/77.783496
Publication status	Published - 1999

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Electrical and Electronic Engineering

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title = "Quench time lag and its statistical characteristics of NbTi mechanical PCS measured with pulsed current",

abstract = "This paper describes quench time lag characteristics of NbTi mechanical PCS through which pulsed current flows. The quench of the mechanical PCS takes place when the switch current is slowly increased and exceeds a critical value IT0. On the other hand, quench of the PCS through which pulsed current flows does not occur at the moment of the instantaneous current exceeding IT0, but takes place after a time delay TD. The quench time lag TD depends on rise time and peak value of the pulsed current IP. A theoretical model is proposed to show that TD corresponds to time in which superconducting connection bridge is heated up to a critical temperature mainly by flux flow loss. TD sharply fluctuates when IP is just over the static critical current IT0, but remarkably decreases when IP is further increased. It is found that statistical characteristics of TD are well fitted to Weibull distribution function.",

author = "Junya Suehiro and Daisuke Tsuji and Koichi Tsutsumi and Shinya Ohtsuka and Masanori Hara",

note = "Funding Information: Manuscript received September 15, 1998 This work was partly supported by a Grant-in-aid for Science Research from Ministry of Education, Science, Sports and Culture, Japan",

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T1 - Quench time lag and its statistical characteristics of NbTi mechanical PCS measured with pulsed current

AU - Suehiro, Junya

AU - Tsuji, Daisuke

AU - Tsutsumi, Koichi

AU - Ohtsuka, Shinya

AU - Hara, Masanori

N1 - Funding Information: Manuscript received September 15, 1998 This work was partly supported by a Grant-in-aid for Science Research from Ministry of Education, Science, Sports and Culture, Japan

PY - 1999

Y1 - 1999

N2 - This paper describes quench time lag characteristics of NbTi mechanical PCS through which pulsed current flows. The quench of the mechanical PCS takes place when the switch current is slowly increased and exceeds a critical value IT0. On the other hand, quench of the PCS through which pulsed current flows does not occur at the moment of the instantaneous current exceeding IT0, but takes place after a time delay TD. The quench time lag TD depends on rise time and peak value of the pulsed current IP. A theoretical model is proposed to show that TD corresponds to time in which superconducting connection bridge is heated up to a critical temperature mainly by flux flow loss. TD sharply fluctuates when IP is just over the static critical current IT0, but remarkably decreases when IP is further increased. It is found that statistical characteristics of TD are well fitted to Weibull distribution function.

AB - This paper describes quench time lag characteristics of NbTi mechanical PCS through which pulsed current flows. The quench of the mechanical PCS takes place when the switch current is slowly increased and exceeds a critical value IT0. On the other hand, quench of the PCS through which pulsed current flows does not occur at the moment of the instantaneous current exceeding IT0, but takes place after a time delay TD. The quench time lag TD depends on rise time and peak value of the pulsed current IP. A theoretical model is proposed to show that TD corresponds to time in which superconducting connection bridge is heated up to a critical temperature mainly by flux flow loss. TD sharply fluctuates when IP is just over the static critical current IT0, but remarkably decreases when IP is further increased. It is found that statistical characteristics of TD are well fitted to Weibull distribution function.

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Quench time lag and its statistical characteristics of NbTi mechanical PCS measured with pulsed current

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