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    New electrical shunt with two rectangular holes in a copper plate
    (2015-11-01)
    Kando, Masaaki
    ;
    Pattanadech, Norasage
    A new concept of an electrical shunt with two rectangular holes in a copper plate (ESRP) has been developed to be used for measuring a large current with a short-duration steep wave in a high-voltage field. The ratio of the input current to the output current is 10<sup>6</sup>, as obtained from a DC voltage test circuit. The electrical shunt has a special configuration. To verify the shunt current ratio of ESRP in a real application, the shunt current was connected to a sphere-to-sphere electrode breakdown test circuit with a 10 mm gap to measure the large damping current (8.4 kA) of a DC breakdown voltage. The voltage signal from the shunt was transmitted to excite two light-emitting diodes (max. 50 mA, 4 V), which were reverse-connected in series. The light-emitting diodes operated properly and were illuminated, which validated the capability of the newly designed electrical shunt.
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    New current-voltage transferring device with different metals
    (2015-09-01)
    Kando, Masaaki
    ;
    Pattanadech, Norasage
    A new concept of an electrical shunt with different materials (aluminum and copper) has been developed to be used as an alternative current measurement device. The device provides better current measurement characteristics compared with the conventional current measurement devices such as a shunt resistor with an ammeter or the multiple shunts consisting of molybdenum having a low temperature coefficient and a Rogowski coil with an integrated circuit. The currents in several electrical circuits have been measured using the developed current-voltage transferring device (CVTD) as voltages between the aluminum and copper elements. The measured voltages (V<inf>m</inf>) are proportional to measuring currents (I<inf>m</inf>), which is shown as the following the experimental equation V<inf>m</inf> [mV] =kI<inf>m</inf> [A], in which k is a coefficient depending on the configuration of the CVTD.
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