Analysis of Voltage Noises for the Reliability Improvement of the KSTAR CS Quench Detection

Geonwoo Baek; Jinsub Kim; Hyoungku Kang; Tae Kuk Ko; Yong Chu

doi:10.1109/TASC.2018.2802651

Analysis of Voltage Noises for the Reliability Improvement of the KSTAR CS Quench Detection

Geonwoo Baek, Jinsub Kim, Hyoungku Kang, Tae Kuk Ko, Yong Chu

Department of Electrical and Electronic Engineering

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

Abstract

In the Korea Superconducting Tokamak Advanced Research (KSTAR), quench detection system using central difference averaging (CDA) and mutual inductance compensation (MIK) for central solenoid (CS) magnet has been studied. Similar to the cowound voltage taps, it is expected that this method can provide the good capability of rejecting inductive voltage noise. Accordingly, CDA and MIK method could be considered as a promising way. For this method to be an effective way, the inductive voltages should be accurately estimated, and then the measured CDA voltages are compared with the estimated ones. In previous studies, CS and poloidal field (PF) coils were modeled as the ideal solenoids to calculate mutual inductances between them. However, the nonlinearity of inductances due to Incoloy-908 jackets of PF1-PF5 coils that are ferromagnetic materials still needs to be compensated for more accurate estimation of inductive voltages. In this paper, the inductive voltages were estimated by considering the ferromagnetic effect of Incoloy-908 jackets to compensate the error voltages. Based on this study, the effect of Incoloy-908 on accuracy and reliability of CDA and MIK quench detection scheme was analyzed and discussed.

Original language	English
Article number	4701904
Journal	IEEE Transactions on Applied Superconductivity
Volume	28
Issue number	4
DOIs	https://doi.org/10.1109/TASC.2018.2802651
Publication status	Published - 2018 Jun

Bibliographical note

Funding Information:
Manuscript received September 19, 2017; accepted January 29, 2018. Date of publication February 5, 2018; date of current version February 23, 2018. This work was supported in part by the Ministry of Science, ICT and Future Planning of Korea and in part by Ministry of Trade, Industry & Energy, Republic of Korea through “Human Resources Program in Energy Technology” of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) under Grant 20164030201100. (Corresponding author: Yong Chu.) G. Baek is with the Electronics and Electrical Engineering Department, Yonsei University, Seoul 03722, South Korea, and also with the National Fusion Research Institute, Daejeon 305-333, South Korea (e-mail: bgw03@naver.com).

All Science Journal Classification (ASJC) codes

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

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title = "Analysis of Voltage Noises for the Reliability Improvement of the KSTAR CS Quench Detection",

abstract = "In the Korea Superconducting Tokamak Advanced Research (KSTAR), quench detection system using central difference averaging (CDA) and mutual inductance compensation (MIK) for central solenoid (CS) magnet has been studied. Similar to the cowound voltage taps, it is expected that this method can provide the good capability of rejecting inductive voltage noise. Accordingly, CDA and MIK method could be considered as a promising way. For this method to be an effective way, the inductive voltages should be accurately estimated, and then the measured CDA voltages are compared with the estimated ones. In previous studies, CS and poloidal field (PF) coils were modeled as the ideal solenoids to calculate mutual inductances between them. However, the nonlinearity of inductances due to Incoloy-908 jackets of PF1-PF5 coils that are ferromagnetic materials still needs to be compensated for more accurate estimation of inductive voltages. In this paper, the inductive voltages were estimated by considering the ferromagnetic effect of Incoloy-908 jackets to compensate the error voltages. Based on this study, the effect of Incoloy-908 on accuracy and reliability of CDA and MIK quench detection scheme was analyzed and discussed.",

author = "Geonwoo Baek and Jinsub Kim and Hyoungku Kang and Ko, {Tae Kuk} and Yong Chu",

note = "Funding Information: Manuscript received September 19, 2017; accepted January 29, 2018. Date of publication February 5, 2018; date of current version February 23, 2018. This work was supported in part by the Ministry of Science, ICT and Future Planning of Korea and in part by Ministry of Trade, Industry & Energy, Republic of Korea through “Human Resources Program in Energy Technology” of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) under Grant 20164030201100. (Corresponding author: Yong Chu.) G. Baek is with the Electronics and Electrical Engineering Department, Yonsei University, Seoul 03722, South Korea, and also with the National Fusion Research Institute, Daejeon 305-333, South Korea (e-mail: bgw03@naver.com).",

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N2 - In the Korea Superconducting Tokamak Advanced Research (KSTAR), quench detection system using central difference averaging (CDA) and mutual inductance compensation (MIK) for central solenoid (CS) magnet has been studied. Similar to the cowound voltage taps, it is expected that this method can provide the good capability of rejecting inductive voltage noise. Accordingly, CDA and MIK method could be considered as a promising way. For this method to be an effective way, the inductive voltages should be accurately estimated, and then the measured CDA voltages are compared with the estimated ones. In previous studies, CS and poloidal field (PF) coils were modeled as the ideal solenoids to calculate mutual inductances between them. However, the nonlinearity of inductances due to Incoloy-908 jackets of PF1-PF5 coils that are ferromagnetic materials still needs to be compensated for more accurate estimation of inductive voltages. In this paper, the inductive voltages were estimated by considering the ferromagnetic effect of Incoloy-908 jackets to compensate the error voltages. Based on this study, the effect of Incoloy-908 on accuracy and reliability of CDA and MIK quench detection scheme was analyzed and discussed.

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