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Author: search.filters.author.Chompoo-inwai, C.

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    Oil-immersed transformer temperature monitoring by ANSI/IEEE C57.91 model
    (2007-12-01)
    Maleewat, P.
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    Tadsuan, S.
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    Saelee, V.
    ;
    Chompoo-inwai, C.
    This article presents the development of a 3-phase oil immersed transformer temperature monitoring equipment. The developing prototype employs ANSI/IEEE C57.91 standard mathematical model to calculate the hottest spot of the transformer winding, and use the AT89CS8252 MCS51 microcontroller for an implementation. Main components of the newly developed prototype consists of input sensors, MCS51 microcontroller, and 7-segment display. Input sensors are RTD (PT100), CT and PT. An output display is 7-segment displaying transformer current, voltage, ambient temperature, top-oil temperature and hot-spot temperature. Test results show that measuring temperatures obtained from the new prototype are close to those from the conventional standard measuring instruments (CSI). As a result, transformer industries can find the benefits of the developing prototype of gathering and analysis transformer temperature data. In addition, this equipment can notify operators if their operating transformers are withstanding the overload or over temperature or not. © 2007 RPS.
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    An analysis of total loss and temperature of oil-immersed transformer with short circuit test linear load and non-linear load
    (2005-01-01)
    Suechoey, B.
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    Tadsuan, S.
    ;
    Khluabwannarat, P.
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    Chompoo-inwai, C.
    This paper presents the measured temperature at top oil and on winding at high voltage part, low voltage part due to winding loss. By placing the thermocouples at the bottom, the middle and the top of mineral oil-immersed transformer, the variety winding temperatures are measured. The 3 - test conditions are 1. Short circuit test, 2. Linear load test and 3. Non linear load test. The temperature results show the difference temperature at any parts of the 10 kVA, 380V/220V, 3 phase, Dyn11 and ONAN ventilating transformer. The results of measured temperature will be compared with one another to get the difference temperature. If that temperature is higher than the rated temperature of insulator in transformer, its lifetime will be shorter. Finally, the result will be analysed about the relations among heat at any part and are useful for design, correction and protection of the transformer by heat.
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    Failure analysis of dielectric of low voltage power capacitors due to related harmonic resonance effects
    (2001-12-01)
    Boonseng, C.
    ;
    Chompoo-inwai, C.
    ;
    Kinnares, V.
    ;
    Nakawiwat, K.
    ;
    Apiratikul, P.
    This paper presents an investigation on the failure of low voltage power capacitors used in the textile industrial located on Thailand. The causes of the failure as well as the failure mechanisms of the dielectric used as the insulation of such capacitors are analyzed. It is found that the harmonic resonance can increase the current flowing through the capacitors. This result in the extra heat, generated inside the dielectric, which exceeds the level under the normal operation. Such heat results in the increase of the partial discharge inside the capacitors. This can eventually lead to the reduction of the lifetime of the capacitors.