• Title/Summary/Keyword: Power Measurement

검색결과 4,630건 처리시간 0.037초

수축형 수차발전기 축진동에 관한 연구(I) (A Study for the Shaft Vibration of the Vertical Type Hydro Electric Power Generator)

  • 이승원
    • 전기의세계
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    • 제13권3호
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    • pp.28-37
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    • 1964
  • It is the intention of this thesis to discriminate and investigate the cause of the shaft vibration of the vertical type hydroelectric power generator with respect to electrical, mechanical and hydraulic aspects, and to analyze the vibration which will occure by the each cause investigated above. In order to test the shaft vibration of No.1 generator in Hwachon, Korea new measurement method and measuring equipments were designed. In practice the shaft vibration of the generator was measured by above equipments and analyzed by the discriminative method. Detailed explanation for the designed measurement method and instruments is presented, and the results which I had tested three times for the generator No.1 in Hwachon power plant are added. As a appendix the mechanism and causes of the thrust bearing's wear and remarks for the runner are written.

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전력케이블용 절연재료의 캐리어 극성 및 공간전하 측정기술에 관한 연구-PE-EVA에서의 하전입자의 거동 (A Study on the Space Charge Measurement Technique and Carrier Polarity of Insulating Materials on Power Cable)

  • 국상훈;박중순;강용철;권영수
    • 대한전기학회논문지
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    • 제41권2호
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    • pp.185-191
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    • 1992
  • In this paper, it is attempted to distinguish the charged particles and to judge the polarity by the use of Thermally Stimulated Current(TSC) and Temperature Gradient Thermally Stimulated Surface Potential Measurement(TG-TSSP)with experimental insulation material XLPE-EVA for power cables which is made by blending cross-linked polyethylene(XLPE) and ethylene-vinylacetate copolymer(EVA). In addition, it is performed to investigate the effect of EVA blending. From the experimental results, it is known that for the case of XLPE-EVA blended experimental material, the generation of space charged electric field is not obtained in the high temperature region due to the obatruction of the injection of trapping carrier by the electron and the positive hole.

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RFID 파워 컨트롤을 이용한 이동로봇의 위치 추정에 관한 연구 (Research about RFID make use of power control on Localization of mobile robot)

  • 정기호;장철웅;심현민;장승관;이응혁
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2006년 학술대회 논문집 정보 및 제어부문
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    • pp.557-559
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    • 2006
  • In this paper we analyze whether recent Radio Frequence Identification technology can be used to improve the localization of mobile robot and persons in their environment. In particular we study the problem of localizing RFID tags with a mobile platform that is equipped with a pair of RFID antennas. This system make use of power control because Tag with Reader distance measurement. We are accurately the low at former time than the environment. A distance measurement is rather correct. This system uses 900MHz Frequencies.

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로드셀과 토크암을 이용한 대용량 토크 측정장치 개발에 관한 연구 (Development of device measuring very high torque via torque arm with attached load cells)

  • 이용범;한승호
    • 유공압시스템학회논문집
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    • 제7권1호
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    • pp.6-10
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    • 2010
  • A measurement of very high torque for track drive unit in construction equipment is usually in difficulties due to the requirement of a torque meter with high capacity, and the limitation of geometry for an experimental set-up. To improve the troublesome problem, a new device was proposed, where a torque transmitted through the torque arm can be measured by load cells attached at each torque arm. The experimental set-up of the new device was carried out in order to measure the torque values for a mechanical feedback type planetary gear box, in which the power flow circulates itself in a closed-loop. The new device enables to measure torque values of 60,000Nm. Additionally, the measured values were estimated statistically in the aspect of their repeatability and reproducibility, so that an acceptable behaviour as a measuring device can be confirmed.

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3차원 측정 로보트 셀 개발 (Development of 3-dimensional measuring robot cell)

  • 박강;조경래;신현오;김문상
    • 제어로봇시스템학회:학술대회논문집
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    • 제어로봇시스템학회 1991년도 한국자동제어학술회의논문집(국내학술편); KOEX, Seoul; 22-24 Oct. 1991
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    • pp.1139-1143
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    • 1991
  • Using industrial robots and sensors, we developed an inline car body inspection system which proposes high flexibility and sufficient accuracy. Car Body Inspection(CBI) cell consists of two industrial robots, two corresponding carriages, camera vision system, a process computer with multi-tasking ability and several LDS's. As industrial robots guarantee sufficient repeatabilities, the CBI cell adopts the concept of relative measurement instead of that of absolute measurement. By comparing the actual measured data with reference data, the dimensional errors of the corresponding points can be calculated. The length of the robot arms changes according to ambient temperature and it affects the measuring accuracy. To compensate this error, a robot arm calibration process was realized. By measuring a reference jig, the differential changes of the robot arms due to temperature fluctuation can be calculated and compensated.

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A Validation Model for the Statistical Power Balance Method Using a Reverberation Chamber

  • Lee, Young Seung;Choi, Sung Woong;Park, Seung Keun
    • Journal of electromagnetic engineering and science
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    • 제13권3호
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    • pp.192-194
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    • 2013
  • This paper proposes a validation model using a reverberation chamber for verification of the effectiveness and accuracy of the statistical power balance (PWB) method. The PWB method treats electromagnetic (EM) field distributions in certain environments as a representative value of an "ensemble" average, so a reverberation chamber is utilized as a testing apparatus to experimentally simulate the sets of measurement field "ensemble" inside a complex environment. Measurements are performed with various test conditions for environmental loss using flat absorbers, and front and side doors of the chamber. Comparison between the PWB analysis and the measurement results shows good agreement, indicating the usefulness of this statistical analysis method for stating the electromagnetic field inside the EM zone as a representative value to general structures.

유도전위 검출방식을 이용한 크레인의 고압 전선로 접근 경보장치 개발 (Development of the Power Line Proximity Warning Apparatus for Mobile Crane using the Induced Voltage Measurement)

  • 최삼진;박찬원;김일환
    • 산업기술연구
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    • 제21권A호
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    • pp.213-219
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    • 2001
  • This paper describes the power line proximity warning device for mobile crane by using the induced voltage measurement method. A mobile crane worker can be easily exposed to dangerous electrical shock and the electrocution while this are working at near the high-voltage electrical lines. In this paper, the derivation electric-potential of the power lines are simulated and microprocessor-based detecting device and transmitter/receiver modules are introduced to show a solution for the dangerous mobile crane working environment.

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도로교통소음 음향파워레벨 산정과 응용에 관한 연구 (A Study on the Computation and Application of Sound Power Level for Road Traffic Noise)

  • 김득성;오진우;홍세화;이기정;장서일
    • 한국소음진동공학회:학술대회논문집
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    • 한국소음진동공학회 2004년도 춘계학술대회논문집
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    • pp.527-534
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    • 2004
  • This study is a paper relating to between road traffic noise(RTN) and sound power level(PWL). At present to prediction of RTN is used to many experimental models and prediction methods. RTN is computed PWL using existing experimental models and prediction methods. Then, computed PWL is compared with it of measurement value, in them, it is selected model most similar to measurement value. And then, this results will watch for make Noise Map, as application field applied to computed results.

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A Comparative Study on Frequency Estimation Methods

  • Kim, Yoon Sang;Kim, Chul-Hwan;Ban, Woo-Hyeon;Park, Chul-Won
    • Journal of Electrical Engineering and Technology
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    • 제8권1호
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    • pp.70-79
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    • 2013
  • In this paper, a comparative study on the frequency estimation methods using IRDWT (Improved Recursive Discrete Wavelet Transform), FRDWT(Fast Recursive Discrete Wavelet Transform), and GCDFT(Gain Compensator Discrete Fourier Transform) is presented. The 345[kV] power system modeling data of the Republic of Korea by EMTP-RV is used to evaluate the performance of the proposed two kinds of RDWT(IRDWT and FRDWT) and GCDFT. The simulation results show that the frequency estimation technique based on FRDWT could be the optimal frequency measurement method, and thus can be applied to FDR(Fault Disturbance Recorder) for wide-area blackout protection or frequency measurement apparatus.

입자 조사에 의한 PT형 전력 다이오드의 스위칭 특성 향상 (Switching Characteristics Enhancement of PT type Power Diodes by means of Particle Irradiation)

  • 김병길;최성환;이종헌;배영호
    • 한국전기전자재료학회:학술대회논문집
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    • 한국전기전자재료학회 2005년도 추계학술대회 논문집 Vol.18
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    • pp.16-17
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    • 2005
  • Local lifetime control by ion implantation has become an useful tool for production of modern power devices. In this work, punch-through diodes were irradiated with protons for the high speed power diode fabrication. Proton irradiation was executed at the various energy and dose conditions. Characterization of the device was performed by I-V, C-V and Trr measurement. We obtained enhanced reverse recovery time characteristics which was about 45% of original device and about 73% of electron irradiated device. The measurement results showed that proton irradiation was able to effectively reduce minority carrier lifetime.

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