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

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    Comparision of power loss of three-phase induction motor of four techniques with PWM inverter supply
    (2007-12-01)
    Tadsuan, S.
    ;
    Suechoey, B.
    ;
    Saelee, V.
    ;
    Chompoo-Inwai, C.
    The purpose of this research is to study the power loss in three-phase induction motors linked with a three-phase PWM inverter by adjusting various fundamental wave voltages of the motors. The experimental procedures used four adjustment techniques as: 1. Constant DC link voltage inverter and adjusting the modulation amplitude 2. Constant modulation amplitude equal 1 and adjusting DC link voltage of inverter 3. Sixstep inverter and 4. Constant modulation amplitude equal 2.3 (over mod land adjusting DC link voltage of inverter. The four techniques were used to adjust V/f-type fundamental waves. The results indicated that the adjustment technique showing the power input, power output, power loss and efficiency of the motor. © 2007 RPS.
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    New techniques the computer-aided design for substation grounding
    (2000-01-01)
    Phithakwong, B.
    ;
    Kraisnachinda, N.
    ;
    Bayjongjit, S.
    ;
    Chompoo-Inwai, C.
    ;
    Kando, M.
    This paper describes the use of software programming for the substation grounding system which is designed for worker's safety. This grounding system presents a new method to increase grounding resistance of the human foot. The new method can decrease the number of conductors of an unequally spaced grid and it is a supplement to ANSI/IEEE std. 80-1986. It also uses 10-30 percent less grounding grid material for safe and economical design. This paper also presents touch and step voltage for a safety design.
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    An analysis and selection of distribution transformer for losses reduction
    (2000-01-01)
    Suechoey, B.
    ;
    Ekburanaway, J.
    ;
    Kraisnachinda, N.
    ;
    Banjongjit, S.
    ;
    Chompoo-Inwai, C.
    Thailand's medium-sized industries, with demands ranging from 30-1999 kW., currently need to select transformers that provide the highest efficiency regarding transformer losses. This is partly because the energy authorities that provide the electricity have fixed the loss ratio values for transformers. In this paper, an analysis of how to select the suitable size of transformer is presented. The considered factors include efficiency, losses, rating, capital cost throughout the transformer commission time, the cost of the energy, and % interest rate. The analysis includes an example of calculation and selection.