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    Frequency response characteristics of rogowskilightningcoil withmeasurementactive integrator for
    (2020-02-28)
    Paophan, Busayapol
    ;
    Kunakorn, Anantawat
    ;
    Yutthagowith, Peerawut
    ;
    Yamamoto, Kazuo
    This paper presents frequency response characteristics of a Rogowski coil which is developed with an active integrator. Experiments are performed in a laboratory with a frequency function generator as a source. The frequency responses of the Rogowski coil and the integrator are recorded with both magnitude and phase in order to verify the capability in measur-ing lightning current waveshapes. For availability in lightning current measurement in the electrical sys-tem, the developed Rogowski coil is specifically de-signed as a clamp on device. The standard lightning current waveshape of the positive first stroke impulse (10/350 µs) is simulated to investigate the measur-ing system. It is found that the frequency bandwidth of the Rogowski coil with the integrator developed in this paper is proper in lightning current measure-ment.
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    A rogowski coil with an active integrator for measurement of long duration impulse currents
    (2014-12-03)
    Yutthagowith, Peerawut
    ;
    Leelachariyakul, Banyat
    This paper presents design and construction of an impulse current measuring system based on a Rogowski coil with a non-inverting active integrator. The developed measuring system was designed for measurement of millisecond impulse currents. The comparative measurements of the same Rogowski coil with various integrators and of a non-inductive shunt resistor were carried out in an HV Laboratory. In this paper, the performance of the developed integrator with the same Rogowski coil was compared with that of other integrators (a conventional RC integrator, a compensated RC integrator and an inverting active integrator). From the experimental results, the proposed active integrator provides promising performance comparable to that of the non-inductive shunt resistor. This accomplishment will be useful in measurement of long duration impulse currents and also evaluation test of surge arrester.
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    Rogowski coil with an active integrator for measurement of switching impulse current
    (2013-09-02)
    Limcharoen, Worrakan
    ;
    Yutthagowith, Peerawut
    This paper presents design and construction of an impulse current measuring system based on a Rogowski coil with various types of integrators, a conventional RC integrator, a compensated RC integrator, and an active integrator. The developed measuring systems were designed for measurement of switching impulse current waveform used in a residual voltage test of arresters. The comparative measurement of the Rogowski coil with those integrators and non-inductive shunt resistor were carried out in an HV Laboratory. From the experiment results measured by the same Rogowski coil with various integrators show that all current measuring systems provide accurate front time. The Rogowski coil with the conventional RC and compensated integrators provide inaccurate measurement of inverse current peak and tail time. The Rogowski coil with the active integrator provides all fairly accurate waveform parameters when it was compared to the measured results by the non-inductive shunt resistor. © 2013 IEEE.