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    Improvement of standard suspension type insulator by the semiconducting glaze for pollution condition
    (2007-12-01)
    Samanmit, U.
    ;
    Chusanapiputt, S.
    ;
    Phoomvuthisarn, S.
    ;
    Vassanasong, A.
    ;
    Pinjom, A.
    This paper presents the behavior of 52-1 standard type suspension insulators coated with semiconducting glaze in some areas of the bottom side adjacent to the pin of insulators. Computer simulation program was carried out to investigate the electric field distribution of all tested insulators. The simulation results show that maximum electric field strength of semiconducting glaze insulators are decreased 3.13-26.26% compared with that of ordinary suspension insulators. Then the flashover voltage of the test specimen was investigated both dry and salt fog pollution condition according to IEC 507. The test results show that corona inception voltage of semiconducting glaze insulator is increased under artificial contamination test but its dry flashover voltage is decreased with increasing the semiconducting glaze length. It was found that the suitable length of semiconducting glazed standard insulator is 28 millimeters that has increasing corona inception voltage and flashover voltages are in the acceptable voltage rang of ANSI 52-1 standard. © 2007 RPS.
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    The effect of convexity of lightning impulse voltage waveforms on accuracy of HV measuring systems
    (2006-01-01)
    Yutthagowith, P.
    ;
    Pattanadech, N.
    ;
    Chatpattananan, V.
    ;
    Phoomvuthisarn, S.
    This paper presents the effect of convexity of lightning impulse voltage waveforms on accuracy of HV measuring systems. The effects of different three convexities on wave front are analyzed by simulation tests with some standard waveforms. The simulation tests have two aspects. First one is consideration in frequency domain by using FFT with standard waveforms and transfer function of measuring system and second one is consideration in time domain by using time convolution method or Duhamel's integration method for computing waveform outputs standard testing waveforms and unit step responses of the sample measuring systems. The standard waveforms under investigations are full lightning impulse voltage waveforms, tail-chopped of lightning impulse voltage waveforms, front-chopped of lightning impulse voltage waveforms according to IEC standards 60060-2. This paper considers two samples of different types of the measuring systems. The results show that the convexity has effect on accuracy of measuring systems. © 2006 IEEE.
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    Accuracy verification of impulse voltage measuring systems by convolution methods
    (2005-01-01)
    Yutthagowith, P.
    ;
    Pattanadech, N.
    ;
    Kunakorn, A.
    ;
    Phoomvuthisarn, S.
    This paper presents verification of high voltage measuring systems by time convolutions between standard testing waveforms and unit step responses of the measuring systems. The waveforms under investigations are full lightning impulse voltage waveforms, tail-chopped lightning impulse voltage waveforms, front-chopped lightning impulse voltage waveforms and steep-front voltage waveforms according to IEC standards 60060-2 and 61211. This paper considers four different types of the measuring systems. The results show that this technique is applicable, and should be a useful method for impulse voltage measurements in a standard high voltage laboratory.
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    Computer aided-program for validation of measuring system from unit step response by time convolution method
    (2005-01-01)
    Yutthagowith, P.
    ;
    Pattanadech, N.
    ;
    Kunakorn, A.
    ;
    Phoomvuthisarn, S.
    This paper presents the design and development of the computer algorithm based on LabVIEW for verification of a high voltage measuring system. The algorithm consists of two parts. The first part is a program for calculating the parameters of unit step responses which are verified an ability of the measuring system by a comparison with the values given in IEC 60060-2. The second part is a program for calculating the output voltage waveform by time convolutions between standard testing waveforms and unit step responses. The standard waveforms under investigation are full lightning impulse voltage waveforms, tail-chopped lightning impulse voltage waveforms, front-chopped lightning impulse voltage waveforms and steep-front voltage waveforms according to IEC standards 60060-2 and 61211. This paper considers two different types of the measuring systems, with a resistive voltage divider and a damped capacitive voltage divider for testings. The results show that the algorithm proposed in this paper is practicable, and should be a useful tool for impulse voltage measurements in a standard high voltage laboratory.