| Project/Area Number |
08650393
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Electronic materials/Electric materials
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| Research Institution | Fukuoka Institute of Technology |
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Principal Investigator |
IMAMURA Masaaki Fukuoka Inst.of Tech., Faculty of Engineering, Professor, 工学部, 教授 (40111794)
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| Co-Investigator(Kenkyū-buntansha) |
NAKAHARA Motonao Fukuoka Inst.of Tech., Faculty of Engineering, Lecturer, 工学部, 講師 (00148909)
YAMAGUCHI Toshinao Fukuoka Inst.of Tech., Faculty of Engineering, Professor, 工学部, 教授 (50037925)
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| Project Period (FY) |
1996 – 1997
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| Project Status |
Completed (Fiscal Year 1997)
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| Budget Amount *help |
¥2,200,000 (Direct Cost: ¥2,200,000)
Fiscal Year 1997: ¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 1996: ¥1,400,000 (Direct Cost: ¥1,400,000)
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| Keywords | Optical Current Transformer / Magnetic Garnet Film / Magnetic Shielding / Faraday Rotation / Flat-Shape Three-Phase Bus-Bar / Alternating Magnetic Field Simulation |
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| Research Abstract |
The optical current transformaer (OCT) was scarcely used in applications fo far. Recently some new reseaches on the OCT have been begun for its practical application and improbements of performance. The main purpose of those researches is to develop the OCTs that can be incorporated into electric power devices like the circuit-breakers, taking full advantage of the OCT that is light weight, small size and good isolation. We have studied the possibility of applying the OCT to three-phase power equipment used at a low or middle voltage of 3 or 6 kV.In this study, we proposed the OCT sturyucture that has shielding around bus-bars and made analyzes about the interference of magnetic fields.
(Year : 1996) It was shown that mutual interference in three-phase ac fields and the influence of eddy currents which are problems when applying the OCT to the three-phase bus-bar equipment can be reduced by using the proposed duoble shield structure. This sturcture can be applied to both the side by side and the longitudinal arrangements of bus-bars without a change in the form of the shield. Porblems originating in non-linear characteristics of magnetic matrials, such as magnetic sensor films and shielding cores, used in this OCT were investigated experimentally and mage them clear.
(Year : 1997) We deceloped experimental work on the OCT structure simulated. As a result of this experimental investigation, the following were confirmed : (1) Non-oriented S-Fe laminations exhibit the sufficient shielding effect for this application. (2) The (BigdY)_3D2(FeAl)_5O_<12> film prepared for this experiment shows excellent M-H characteristics on linearity. (3) It is considered that the slight waveform-distrotion can be removed by apporpriately selecting the ac optical detector.
It is necessary to improve the structure of field sensor further for decreasing liht transimission losses. Our research is being continued to work this problem out.
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