• 소음진동
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• 제10권2호
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• pp.299-305
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• 2000

In this study, the characteristics of transmitted vibration on hand-arm system are examined when operating electric hand tools. Also through the correlation analysis between anthroponetric data and transmitted vibration, and comparison study with appropriate amount of work done based on the ISO criteriaa, the basic data for the ergonomic work design can be presented. The types of electric tools and works for the experiment are drill (general type and impact type), grinder, wire brush and steel to analyze the characteristics of transmitted vibrations, the amount of transmitted vibrations in X, Y and Z direction at tool(T), hand(H), wrist(W), and the joint between foream and upper arm(A) were measured at the frequency range of 6.3∼1000[HZ]. Also, the limit of human exposure to vibration, and the response of frequency were conducted.

• 한국자동차공학회논문집
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• 제20권2호
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• pp.8-14
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• 2012

"Throttle-by-Wire" is an electronic throttle system in which mechanical cables and hydraulics are replaced by a fieldbus network, electric motors and sensors. It is crucial for an electronic throttle to design a controller that can offer an accurate and fast reference tracking performance in the presence of nonlinearities, such as friction in the gearbox and "limp-home" nonlinearity. This paper presents a nonlinear dynamic inversion based control algorithm for electronic throttle systems. Using the proposed method, the specified control performance can be achieved by canceling inherent nonlinear characteristics of the electronic throttle system. The control performance is investigated through a set of simulation results.

• KEPCO Journal on Electric Power and Energy
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• 제5권3호
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• pp.141-147
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• 2019

최근 전력산업에 가장 커다란 이슈는 신재생에너지의 증가이며 이에 따라 전력계통의 수용성을 확보하기 위한 다양한 기술개발이 추진되고 있다. 또한 세계적으로 보다 융통성 있는 친환경 에너지의 활용을 위하여 국가 및 지역간 전력계통을 연계하는 슈퍼그리드의 구성이 추진되고 있다. 이러한 성격이 서로 다른 계통 간에 연계를 위하여 반드시 요구되는 기술이 초고압 직류송전기술이다. 지금까지 국내에서는 육지와 제주도를 해저케이블로 연결하는 HVDC 송전기술이 적용되었으나 동해안의 발전단지에서 수도권의 부하밀집 지역으로 장거리 대용량 전력전송을 위한 직류가공송전 방식의 기술개발이 추진되고 있다. 인구밀도가 높고 산악이 많은 국내 환경을 고려해 최소한의 경과를 활용하여 8 GW 급의 대용량 전력을 전송하기 위해 도체귀로방식의 ${\pm}500kV$ Double Bipole 송전선로 설계기술을 개발하고 이를 적용하기 위한 사업화를 추진하고 있다. 본 논문에서는 세계 최초로 적용 예정인 도체귀로방식의 Double Bipole 송전선로의 설계를 위한 절연특성에 관한 연구를 수행하고 송전선로에 발생하는 다양한 과전압현상에 견디는 공기절연특성을 실증시험을 통하여 검증하고 이를 서술하였다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1995년도 하계학술대회 논문집 C
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• pp.1278-1280
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• 1995

A probe type fiber-optic sensing techique for electric current measurement is applied in this paper. The technique is based on the Faraday effect which meaning is that polarization state of light is rotated by magnetic field. In experiment, test wire is located at inside and outside of the probe to be measured. The experimental results prove not only linear property, but also polarization rotation property according to the distance from outside of probe.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 1997년도 한국자동제어학술회의논문집; 한국전력공사 서울연수원; 17-18 Oct. 1997
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• pp.1696-1699
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• 1997

The robot mainpulator for inspection of pressurizer in the nuclear power plant has been developed, which consists of four parts : 2 arms, movable gripper, base frame, contorl console. To extract the damaged electric heating rod inside pressurizer, the gripper has been developed using wire lope and self-locking mechanism. for the examination of the structural stability of the robot manipulator, stress analysis is performed by using the ANSYS code.

• 한국조명전기설비학회:학술대회논문집
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• 한국조명전기설비학회 2002년도 학술대회논문집
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• pp.375-378
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• 2002

An arc/spark detector (ASD) was developed is to early detect wire failures and insecure connections that may lead to fire in residents and commercial and industrial facilities. A detailed circuit design for ASD implementation along with prototype product is reported. The tests of ASD, which were successful in phase identification, in many different arc/spark locations under different loadings, and in false alarm probability, showed the ability and capability of the state-of-the-art detector in the electric fire hazard prevention.

• E2M - 전기 전자와 첨단 소재
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• 제11권10호
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• pp.40-45
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• 1998

This paper describes a collaborative work between SEI and KEPCO on the Superconducting Magnetic Energy Storage system (SMES). We have studied two types of magnets. One is the 400kJ class LTS-SMES for testing the power stabilization operated at liquid helium temperature (4.2K) and the other is the 100J class HTS-SMES for confirming the possibility of applying HTS wire to SMES at liquid nitrogen temperature (77k). In this paper, the design of the magnet and the test results are described. Each magnet performed completely at rated operation.

• 한국초전도저온공학회:학술대회논문집
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• 한국초전도저온공학회 2000년도 KIASC Conference 2000 / 2000년도 학술대회 논문집
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• pp.29-32
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• 2000

Superconducting transmission cable is one of interesting part in power application using high temperature super-conducting wire as transformance. One important parameter in HTS cable design is transport current distribution because it is related with current transmission capacity and loss. In this paper, we present the calculation theory of current distribution for multi-layer cable using the electric circuit model and in example, calculation results of current distribution and AC loss in each layer of 4-layer HTS transmission cable.

• 대한전자공학회논문지TC
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• 제39권3호
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• pp.150-157
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• 2002

펄스 안테나로 많이 사용되는 종래의 직선형 혹은 V-형 안테나의 원거리전장은 null점들을 갖는 주파수 특성을 가지므로 제한된 펄스 복사 능력을 가진다. 이를 개선시키기 위해 비선형적 형상을 갖는 와이어안테나의 합성법을 제안하였다 즉, 복사 전장의 주파수 의존성을 최소화시키는 형상방정식을 유도하고 그 해를 산출하므로서 리플형의 광대역 특성을 갖는 형상을 합성하였다. 그 결과 매우 넓은 주요 스펙트럼을 갖는 짧은 펄스의 복사에 유리함을 보였다. 따라서, 펄스폭이 좁을수록 합성된 다이폴 안테나 특성이 종래의 선형 다이폴 보다 우수한 피크치를 갖는 펄스 복사가 이루어짐을 보였다. 전류 분포 및 원거리 전장의 과도해석을 위해 모멘트법에 기반한 역 이산 푸리에 변환을 사용하였다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2004년도 하계학술대회 논문집 A
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• pp.584-586
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• 2004

This paper deals with the development of on-line fault and lightning stroke section locating system for branched overhead transmission line. The section locating algorithm of this system i3 by analyzing the distribution pattern of current flowing through the overhead ground wire. It composes of three parts; current sensors, local remote terminal unit(RTU) and analysis program at surveillance tenter. Double Rogowski coil sensor having integrating amplifier was designed as current sensor. In order for current pattern analysis, the transmitted waves from each sensor wert synchronized by GPS tim c clock in RTU. While, lightning stroke location are judged only by polarity information of lightning currents. This design has a benefit in simplicity of signal processing unit of RTU.