• Title/Summary/Keyword: E-J power

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A Study on the Back-up Control of Boiler Controller for a Thermal Power Plant (발전소 보일러 제어기의 back-up 제어에 관한 연구)

  • Kim, J.H.;Cho, Y.J.;Chung, K.K.;Bien, Z.
    • Proceedings of the KIEE Conference
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    • 1987.07a
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    • pp.213-215
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    • 1987

  • As a means of improving the reliability of the analog type controller for the thermal power plant, an efficient method is proposed, which is to place the hardware redundancy, i.e. a back-up controller with fault detecting capability. FTCS is implemented by using multi-processors and it is experimentally verified that the back-up controller takes over the role of the original controller, controlling the faulty loop.

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Partial Discharge Measurement in Power Cables using Switching Impulse Voltages (전력케이블에서 개폐충격파를 이용한 부분방전 측정)

  • Lee, J.S.;Jang, E.;Koo, J.Y.;Kim, J.T.;Cho, Y.O.;Kim, S.J.;Song, L.K.;Kim, J.Y.
    • Proceedings of the KIEE Conference
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    • 1997.11a
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    • pp.382-384
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    • 1997

  • On-site partial discharge test by use of AC voltage has been considered not to be appropriate for the extruded power cable due to their large capacitance depending on their lengths. Therefore, it is proposed, in this work, to use switching impulse voltage of which the front time is set from 1ms to 10ms. This newly proposed method enables us to simulate the 1/4 period of power frequency at 60 Hz and to obtain similar effect of AC voltage test. Our tentative results show that 51 voltage is proved to be an alternative method, replacing AC voltage, by which partial discharge was well produced from the artificial defects integrated in 22.9kV distribution power cables.

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