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전기의세계

대한전기학회 (The Korean Institute of Electrical Engineers)

  • 월간
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  • 1598-4613(pISSN)

제14권5호

  1. 한만춘;김흥수 1
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    Using "Yonsei$^{101}$ Analog Computer" the poisoning of the Xenon$^{135}$ in a thermal homogeneous nuclear reactor is analyzed. The simulator is constituted of high gain D.C. operational amplifiers and operational impedances. During the nuclear reactor operation, the Xenon poisoning increases against time until the equilibrium state reaches. After the reactor shut-down, it increases remarkably until the maximum value and then decreases. The simulated curves agree with theoretical values satisfactorily. The accuracy of the analog computer solution is 0.4387 per cent during the nuclear reactor operation and 6.7 per cent after the nuclear reactor shut-down respectively.pectively.
  2. 박영문 8
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    Because of the flat slope of the magnetic characteristic curves at high saturation, the transformer inrush current peakes may assume an extreme magnitude. Even though such is rarely any danger to the transformer itself, the currents can cause serious problems in associated apparatus. This paper has analyzed various limiting factors of excess inrush currents, and then has suggested how to determine the frequency of encountering the inrush current peaks higher than an arbitrarily chosen value by deriving the probability equations of inrush current occurrence.
  3. 이계호 15
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    Laminated insulators are largely used in the insulation of electric apparatus. This reason is based on the fact that the solid state insulators meet to electrical break-down by the weak spot theory. Thus the break-down voltage of the laminated insulators are generally affected by the density, distribution and the form of the weakspot contained in the each laminated thin insulator. In this experiment the effects of the characterics of weak spots are not studied, but the effects of the number of lamination and the pressure applied on the laminated insulator on its break-down voltage are investigated experimentaly, and got some interesting results which are reparted as follows.
  4. 박민호 20
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    There are several methods of speed control in induction motors. One of which is to change the frequency of source but was not used frequently because of the difficulty of frequency-change. Then, the development of frequency changer using semiconductor enables the method useful. In this paper the speed characteristics of mechanical output, secondary input torque and secondary power factor are described when the frequency of source and voltage which is proportional to the frequency of source in order to make the flux in the air gap in constant, are changed. The above characteristics are searched on the basis of the rated characteristics of the motor. Because the ratio of these is proportional to that of the secondary current or the square value of it. To get the ratio of the secondary current, a current circle diagram is introduced, and the magnitude of the ratio from this diagram is accurate and simple. Experimental results are in good agreement with theoretical predictions.
  5. 장수영 28
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    현대의 항공기 발달로 인한 거리감의 단축은 새삼스럽게 말할 필요도 없으나 이들 항공기가 시정이 좋지 못할 때나 야간에 활주로에 안전하게 착륙하기 위하여는 착륙지(Run way)와 유도로(Taxi way)및 과주로(Over run)등에 독특한 조명장치가 필요하게 된다 여기서 현재 대부분의 비행장에서 사용하고 있는 비행장조명방식을 소개하고져 한다.
  6. 양재의 34
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    본기는 1962년 5월 15일자로 설립된 흥한화학섬유주식회사 도농공장에서 일산 15도의 Viscose 인견사를 생산할 목적으로 최대 소요 증기량 매시 57도 및 전력 10,000kw 중 그 일부인 약 4,000kw를 자가발전에 의하여 각 공장의 경제적 운영을 도모키 위하여 서독의 AEG-KANIS회사에서 발주.제작한 것인데 금년 2월 중도에 입하가 개시되어 동년 말까지 설치후 시운전을 완료할 예정이었으나 경제적 기타 사정에 의하여 공사의 지연을 불면하는바 그 시설의 규격, 성능 등에 관한 전반적 개요를 소개하고자 한다.
  7. 오극열 39
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    본고에서는 실습실별로 실습 제목과 시설을 간단히 소개하여 보고자 한다. 1. 기초실험실 2. 전기기기 실험실