• 대한전기학회:학술대회논문집
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• 대한전기학회 2001년도 추계학술대회 논문집 전기물성,응용부문
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• pp.270-273
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• 2001

In this paper, some of optical current transformers and optical potential transformers for extra high voltage system are introduced. The optical current transformer and optical potential transformer will be adopted in the near future, because of increasing demands of high accuracy and good reliability of current transformer and potential transformer. The application cases of optical current transformers and optical potential transformers are also introduced.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2002년도 추계학술대회 논문집 전기물성,응용부문
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• pp.215-218
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• 2002

In this paper some of optical current transformers and optical potential transformers for extra high voltage system are introduced. The optical current transformer and optical potential transformer will be adopted in the near future, because of increasing demands of high accuracy and good reliability of current transformer and potential transformer. The application cases of optical current transformers and optical potential transformers are also introduced.

• 한국통신학회논문지
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• 제8권4호
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• pp.139-144
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• 1983

本論文에서는 MCT(magnito-optic current transformer)를 구성하기 위한 單一모우드光纖維의 偏光特性 및 파라데이回轉에 대한 分析 및 實驗을 하였다. 分析過程에서 單一모우드光纖維는 線形延器로 모델링하였으며 측정결과 순수 birefringence는 2.57 /m로 나타났고 구부림에 의한 birefringence는 구부림 반지름의 제곱에 반비례하였다. 그리고 파라데이回轉에 대한 理論的解析의 결과 자계의 세기(H)에 대한 편광회전감도(F)는 F/H=1.4x$10^-5$rad/[Am]로 나타났다.

• 조명전기설비학회논문지
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• 제24권11호
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• pp.9-16
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• 2010

This paper examines the temperature characteristics of an Optical CT (optical current transformer) using the Faraday effect for measuring high current in a super high voltage-power apparatus. It is performed as follows by the sensor for embodying Faraday effect. $\cdot$ A single-mode optical fiber capable of maintaining a polarization state is used. $\cdot$ A light source is applied at 1310[nm] to a Laser Diode. $\cdot$ The Linear of Faraday effect to a large current is evaluated and $\cdot$ A possible application using an Optical CT was shown. An Influence of Faraday effect to the surrounding temperature measured -40~50[$^{\circ}C$], and the characteristic of the current sensitivity was reported. An application using the results of the temperature compensation system was used in order to compensate for surrounding temperatures. A possibility of applying Optical CT for electric power apparatus was advanced further. We were able to confirm that this temperature calibration method can minimize the fluctuation of the output signal depending on the temperature conditions.

• 대한전기학회논문지:전기물성ㆍ응용부문C
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• 제54권9호
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• pp.407-413
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• 2005

The optical current transformer was developed for 170 kV GIS using optical fiber. The sensor optimized on the optical CT was wound 3 turns and twisted 4 times per a turn at the pipe with a diameter of 130 m. To optimize the optical CT, the output signal was measured according to the setting angle of polarizer and analyzer, The asymmetry and distortion of the output signals were improved when the parallel polarized light was incident to the fiber sensor and under the angle of analyzer was $45^{o}$. The measurement error for the linearity was only $\pm{0.42}\;\%$ to 1,000 A in the case of reflection type.

• 한국조명전기설비학회:학술대회논문집
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• 한국조명전기설비학회 2002년도 학술대회논문집
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• pp.97-101
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• 2002

The optical current transformer using Faraday effect is the sensor to measure current that flows in any conductor. This sensor doesn't undergo the magnetic saturation and effect of adjacent conductors. But this senor using bulk-glass sensing element has crucial drawback. It is impossible that the sensor is mounted to conductor without breaking the closed-loop of light or conductor. So we developed the clamp-type optical current transformer and made an experiment.

• 조명전기설비학회논문지
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• 제17권6호
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• pp.60-65
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• 2003

본 논문에서는 Faraday 효과를 이용한 클램프형 구조의 광-전류 변류기 헤드 설계시에 고려해야할 조건을 이론적으로 해석하고, 이를 토대로 한 클램프형 광-전류 변류기 헤드를 제작하여, 도선에 흐르는 전류, 광의 입사각에 따른 광출력의 변화 및 감도를 측정하고 분석함으로써 전류계로서의 가능성을 입증하였다.

• 한국광학회지
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• 제14권4호
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• pp.399-405
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• 2003

FD10 유리를 이용한 클램프형 광전류 센서를 제작하였다. 대칭형 구조로 이루어진 2조각의 FD10유리를 이용하여 제작하였으며, 센서헤드 내부에서 반사시에 위상차가 발생하는 것을 방지하기 위해 정확히 임계각으로 광이 진행하도록 구조를 설계하였다. 제작한 광-전류 변류기 헤드를 이용하여, 0-1,000 AT 까지의 전류를 측정하고, 빛의 입사각에 따른 광의 손실, 입사광의 편광회전에 따른 광출력변화, 온도에 따른 출력의 변화 및 장시간 전류 측정 등에 대한 실험결과를 제시하고 이에 대한 분석을 통해 제작된 광전류 변류기 헤드의 전류계로서의 가능성을 입증하였다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1987년도 정기총회 및 창립40주년기념 학술대회 학회본부
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• pp.523-526
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• 1987

The present metering transformer being used for measurement has the characteristics of high reliability and high efficiency. In the future, however, it is thought that the scales of mettering transformer will be larger and the cost of production will increase as the transmission voltage ascends to UHV. And, also, it wilt be not easy to ensure the aseismatic capability. For the purpose of settling these problems, by applying optical sensor technology to electric power systems and by developing optical current transformer and potential transformer, we will realize the saving in energy, reduction of cost prise, improvement in measuring precision.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2008년도 제39회 하계학술대회
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• pp.1430-1431
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• 2008

In this paper, a optical current transformer has been designed and favricated to improve temperature stability caused materials properties and insulation in measuring system, suing single crystal as faraday effect cells. We used 850[nm] Laser diode as the light source and PIN Photodiode as receiver. For the experiment, the temperature transformation device make by aluminum. The range of current was from 0[A]$\sim$1600[A] and the range of temperature was from -20[$^{\circ}C$] to 50[$^{\circ}C$]. In a same experimental condition magnitude increased input current increase follow by increasing proportion of input current. The result of this study shows that characteristics of OCT are good, and it can be reflected for practical optical sensors.