메뉴 건너뛰기
.. 내서재 .. 알림
소속 기관/학교 인증
인증하면 논문, 학술자료 등을  무료로 열람할 수 있어요.
한국대학교, 누리자동차, 시립도서관 등 나의 기관을 확인해보세요
(국내 대학 90% 이상 구독 중)
로그인 회원가입 고객센터 ENG
주제분류

추천
검색
질문

논문 기본 정보

자료유형
학술대회자료
저자정보
저널정보
전력전자학회 ICPE(ISPE)논문집 1998년 ICPE논문집
발행연도
1998.10
수록면
961 - 965 (5page)

이용수

표지
📌
연구주제
📖
연구배경
🔬
연구방법
🏆
연구결과
AI에게 요청하기
추천
검색
질문

초록· 키워드

오류제보하기
The rapid development of small-scale (1-10 MJ) Superconducting Magnetic Energy Storage Systems (SMES) can be explained by real perspective of practical implementation of these devices in electro power nets. However the serious problem of all high mechanically stressed superconducting coils - problem of training and degradation (decreasing) of operating current still exists. Moreover for SMES systems this problem is more dangerous because of pulsed origin of mechanical stresses - one of the major sources of local heat disturbances in superconducting coils. We investigated acoustic emission (AE) phenomenon on model and 0.5 MJ SMES coils taking into account close correlation of AE and local heat disturbances.
Two - coils 0.5 MJ SMES system was developed, manufactured and tested at Russian Research Center ?Kurchatov Institute? in the frames of cooperation with Korean Electrical Engineering Company (KEPCO) [1]. The two-coil SMES operates with the stored energy transmitted between coils in the course of a single cycle with 2 seconds energy transfer time. Maximum operating current 1.55 kA corresponds to 0.5 MJ in each coil. The Nb-Ti-based conductor was designed and used for SMES manufacturing. It represents transposed cable made of Nb-Ti strands in copper matrix, several cooper strands and several stainless steel strands'. The coils are wound onto fiberglass cylindrical bobbins.
To make AE event information more useful a real time instrumentation system was used. Two main measured and computer processed AE parameters were considered: the energy of AE events (E) and the accumulated energy of AE events (E_∑). Influence of current value in 0.5 MJ coils on E and E_∑ was studied. The sensors were installed onto the bobbin and the external surface of magnets. Three levels of initial current were examined: 600 A, 1000 A, 1450 A. An extraordinary strong dependence of the current level on E and E_∑ was observed.
The specific features of AE from model coils, operated in sinusoidal vibration current changing mode were investigated. Three current frequency modes were examined: 0.012 H_z, 0.03 H_z and 0.12 H_z In all modes maximum amplitude 1200 A was realized.
Maximum E corresponds to the maximum current and practically no unload/reload Kaiser effect was observed.
On model SMES the correlation of E and E_∑ with vibration current frequency was discovered.

목차

ABSTRACT

INTRODUCTION

1.Acoustic emission data processing.

2.Monitoring of model coil.

3.Monitoring of 0.5 MJ coils.

Conclusions

Acknowledgment

References

참고문헌 (0)

참고문헌 신청

함께 읽어보면 좋을 논문

논문 유사도에 따라 DBpia 가 추천하는 논문입니다. 함께 보면 좋을 연관 논문을 확인해보세요!

이 논문의 저자 정보

최근 본 자료

전체보기

댓글(0)

0

UCI(KEPA) : I410-ECN-0101-2009-560-014236504