• 제목/요약/키워드: Power Industry

검색결과 3,763건 처리시간 0.045초

무접점 차단기용 GTO 소자 병렬 운전 연구 (A STUDY ON GTO'S PARALLELING OPERATION FOR NON-CONTACT CIRCUIT BREAKER)

  • 윤재학;최세경;정명길;김종구
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 1996년도 하계학술대회 논문집 A
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    • pp.546-549
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    • 1996
  • The use of Solid-State switches as interruption devices offers signigicant advantages in circuit breaker applications. In this paper, we introduce a GTO DC circuit breaker using GTOs and ZnO varistors. And also, the result of the research work described in this paper allows to establish the rules for paralleling of GTO's.

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전력산업 R&D 프로젝트의 효율성 및 효과성 평가 (Evaluation of R&D Projects in Electric Power Industry with Efficiency and Effectiveness)

  • 박성민;김헌;백동현
    • 산업공학
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    • 제22권3호
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    • pp.192-204
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    • 2009
  • Based on the characteristics of 'Korean electric power industry R&D programs', this study proposes a new performance evaluation framework where electric power industry related R&D projects are scrutinized. The abovementioned R&D programs have their own goals and especially they emphasize the effectiveness as well as the efficiency of each subordinate R&D project. Hence, in this framework, a performance evaluation procedure is established and then a mathematical model is developed according to the procedure. The model calculates performance evaluation indices for a set of R&D projects integrating the effectiveness with the efficiency of each R&D project. In a case study with an empirical dataset, statistical significance is tested on the integrated performance evaluation indices of R&D projects regarding organizational types and program categories considered.

Computation of Super High-Resolution Global Ocean Model using Earth Simulator

  • Kim, Dong-Hoon;Norikazu Nakashiki;Yoshikatsu Yoshida;Takaki Tsubono;Frank O. Bryan;Richard D.Smith;Mathew E. Maltrud;Matthew W. Hecht;Julie L. McClean
    • 한국해안해양공학회:학술대회논문집
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    • 한국해안해양공학회 2003년도 한국해안해양공학발표논문집
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    • pp.164-169
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    • 2003
  • The need fur higher grid resolution in climate models is often discussed (e.g. McAvaney et al.,2001) because a number of important oceanic processes are not resolved by the current generation of coupled models, e.g., boundary currents, mesoscale eddy fluxes, sill through flows. McClean et al., (1997) and Bryan and Smith (1998) have compared simulated mesoscale variability in simulations at several eddy-resolving resolutions to TOPEX/Poseidon and similar data. (omitted)

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Considerations on the Long-term Reliability of On-line Partial Discharge Ceramic Sensor for Thermal Power Generators and its Demonstration in the Field

  • Sun, Jong-Ho;Youn, Young-Woo;Hwang, Don-Ha;Kang, Dong-Sik
    • Journal of Electrical Engineering and Technology
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    • 제7권1호
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    • pp.103-108
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    • 2012
  • The present study describes the considerations on the long-term reliability of the on-line partial discharge (PD) ceramic sensor for thermal power generators. Voltage acceleration aging tests were carried out under continuous and impulsive thermal aging at more than $100^{\circ}C$, considering the practical service environment. Experimental results show that the sensors have a life that could last for more than 100 years, excellent dielectric characteristics, and insulation strength. In addition, the ceramic on-line PD sensors were installed in a thermal power generator in Korea for demonstration. The results of the PD calibration and test voltage application prove that the on-line ceramic sensors have satisfactory performances for on-line PD measurement.

국가 경쟁력 강화를 위한 공장자동화의 기술개발 전략에 관한 연구 - 운반 하역 기계 산업 중심으로 (A Study on the Strategy of Technological Innovation to Enforce International Competitive Power for the Factory Automation - in the Industry of Automated Transportation and Stevedoring Machinery)

  • 신용하;이근희
    • 산업경영시스템학회지
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    • 제18권36호
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    • pp.205-218
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    • 1995
  • The trends of economic business environment have been changed to the ultimate competion, diverse market and need of new technology. To enforce the international competitive power, continuous technology innovation should be propelled. But the characteristics of small and medium company make it hard to get lead of market share. The industry of transportation and stevedoring machinery also have the same situation as small and medium company. This paper try to present the way of competitive power. The Strategic technology innovation for the industry of transportation and stevedoring machinery consists of product strategy, process design strategy, infra-structure strategy and R&D. There are benefits and shortcommings to get the competitive power for the industry of transportation and stevedoring machinery. Therefore the onclusion presented that capital for reverse engineering, export policy, human resource, thechnical cooperation with the institutions are required.

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$CO_2$ 거래비용 변화에 따른 발전원가(변동비) 영향 분석 (A study of the effect on variable generation cost by the variation of $CO_2$ emission trading price)

  • 정영범;이영일;윤용범
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2007년도 제38회 하계학술대회
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    • pp.822-823
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    • 2007
  • It is easily can be expected that Korea cannot be free under the regulation, because Korea is one of the major $CO_2$ emitter in the world. Even though Korea currently doesn't have any obligation to mitigate the carbon emission, power industry needs to study the effect of that. this paper aims to analyze the change of economic loading order for generation dispatch by various carbon price, looking at each plant's or generator's variable generation cost per unit electricity(kWh) that consists of basic generation price calculated by automatic generation system planning model, WASP 4.0, and $CO_2$ price per unit electricity generation.

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용량요금과 예비전력 기본요금 분석을 통한 전력공급지장비용 유도 (Estimating electricity outage costs using demand charge of stand-by service and Capacity payment in Korea)

  • 정영범;박민혁;마삼선;윤용범
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2007년도 제38회 하계학술대회
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    • pp.117-118
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    • 2007
  • 정전비용 또는 전력공급지장비용은 평가방식이 다양하고 나라마다 그 결과값도 다양하여 범위가 상당이 크기 때문에 적합한 공급지장비용을 결정하는 것은 굉장히 어렵다. 하지만 전력공급시스템마다의 각각의 특성에 맞는 방식을 찾는 노력은 필요하다고 할 수 있다. 본 논문에서는 전력공급지장비용을 회피하기위한 국가적 전력공급시스템 측면에서의 전력공급비용을 수용가가 전력시장에서의 공급지장의 대안으로 지불할 의사가 이미 내포된 비용으로 평가하여, 발전설비와 전력수송경로 측면을 연결하여 용량요금과 예비전력 기본요금 분석을 통해 공급지장비용을 분석하였다.

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의료기기산업의 수출경쟁력 분석 및 강화방안 -강원지역 의료기기산업을 중심으로- (The Analysis and Strengthening Method of Export Competitive Power of Medical Device Industry - With Respect to Medical Device Industry in Gangwon Area)

  • 이강빈
    • 무역상무연구
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    • 제45권
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    • pp.191-238
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    • 2010
  • The purpose of this paper is to make research on the trend of the worldwide medical device market, the trend of the medical device market in the major foreign countries, the present status of the medical device industry in Korea and Gangwon area, the present status of export competitive power and the SWOT analysis of competitive power of the medical device industry in Gangwon area, and the strengthening methods of export competitive power of the medical device industry in Gangwon area. As the research method, the questionaire for the strengthening of export competitive power of the medical device industry in Gangwon area was carried out from August 13 to Otober 22, 2009. The worldwide medical device market in 2008 is estimated at USD 210.2 billion, with the United States being the largest market, followed closely by Japan and Western Europe. In 2006, the worldwide export amount of medical devices recorded USD 121.1 billion and the worldwide import amount of medical devices recorded USD 126.3 billion. As of the end of 2008, the number of Korea's medical device manufacturers expanded to 1,726. The production amount of Korea's medical device industry in 2008 recorded 2,525 billion won, and the domestic market volume of medical devices in 2008 recorded 3,618 billion won. Korea's export amount of medical devices in 2008 recorded USD 1,132 million and recorded a 9.67% growth compared to the previous year, and the import amount of medical devices recorded USD 2,123 million and recorded a 1.43% reduction compared to the previous year. As of the end of 2008, the number of Gangwon area's medical device manufacturers expanded to 81. The production amount of Gangwon area's medical industry in 2008 recorded 380 billion won, and Gangwon area's export amount of medical devices recorded USD 269 million and recorded a 0.25% reduction compared to the previous year, and the import amount of medical devices recorded USD 3 million and recorded a 39.63% reduction compared to the previous year. According to the result analysis of the questionaire for the strengthening of export competitive power of medical device industry in Gangwon area(August 13~October 22, 2009), the competing country of the export medical device is the United States being the highest ranking. Comparing to the collective competitive power level 100 of the competing country, the collective competitive level of the export medical device is 60 below and 70-80 below being the highest ranking. Comparing to the quality level 100 of the United States, EU and Japan, the quality level of the export medical device is 80-90 below being the highest ranking. Comparing to the design level 100 of the United States, EU and Japan, the design level of the export medical device is 90-100 below being the highest ranking. Comparing to the technology level 100 of the United States, EU and Japan, the technology level of the export medical device is 80-90 below being the highest ranking. According to the SWOT analysis of competitive power of medical device industry in Gangwon area, the strength is the abundant expert manpower of the medical device in Wonju area. The weakness is the fragility of the brand recognition of the medical device industry. The opportunity is the demand increase of the new medical device owing to the advanced age of population. The threat is the difficulty of entry into overseas market owing to the request of the new specification certification of the medical device. In order to strengthen the export competitive power of the medical device industry in Gangwon area, the following measures should be taken by the government, local self-government body, related organization and medical device industry : the development of new technology and design, the enhancement of brand recognition. the acquisition of the foreign specification certification, the building of overseas distribution channel and after sales service channel, the positive participation in overseas medical device exhibition and opening of medical device exhibition, the training of expert manpower, the strengthening of overseas marketing, and the application of FTA and the establishment of counter measures against FTA. In conclusion, the medical device industry in Gangwon area has the difficulty in the entry into the overseas market owing to the shortage of overseas marketing capability. Therefore, the government and local self-government body should make the intensive and systematical support for overseas marketing of the medical device industry. For the support of overseas marketing, the government and local self-government body should provide positively the support of expenses for the acquisition of foreign specification certification, the support of participation in the overseas medical device exhibition, the despatch of market development mission, the increase of the support amount for R&D investment fund, and the training of expert manpower of medical devices.

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Influence Analysis of Power Grid Harmonics on Synchronous Hydro Generators

  • Qiu, Hongbo;Fan, Xiaobin;Feng, Jianqin;Yang, Cunxiang
    • Journal of Power Electronics
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    • 제18권5호
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    • pp.1577-1584
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    • 2018
  • The content of harmonic current increases with an increase in the number of power electronic devices in power grid. When a generator is directly connected to the power grid through a step-up transformer, the influence of the harmonic currents on the generator is inevitable. To study the influences of harmonics on generators, a 24-MW bulb tubular turbine generator is taken as an example in this paper. A 2-D transient electromagnetic field model is established. Through a comparative analysis of the data of experiments and simulations, the correctness of the model is verified. The values of the air gap magnetic density, torque and losses of the generator under various conditions are calculated using the finite element method. Taking the rated condition as a reference, the influence of the harmonic currents on the magnetic flux density is analyzed. It is confirmed that the time harmonic is a key factor affecting the generator performance. At the same time, the effects of harmonic currents on the torque ripple, average torque and eddy current loss of the generator are studied, and the mechanism of the variation of the eddy current loss is also discussed.