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    ENERGIZING COIL WOUND ON MAGNETIC CORE AND OSCILLATORY TESTING OF TRANSFORMER
    1.
    发明公开
    ENERGIZING COIL WOUND ON MAGNETIC CORE AND OSCILLATORY TESTING OF TRANSFORMER 审中-公开

    公开(公告)号：EP3347726A1

    公开(公告)日：2018-07-18

    申请号：EP16753451.0

    申请日：2016-08-16

    申请人： Voltech Instruments Ltd.

    发明人： FORD, John Stewart ,  IND, Lionel

    IPC分类号： G01R31/02 ,  G01R31/06

    CPC分类号： G01R31/06 ,  G01R31/027

    摘要： Methods and apparatus for energizing a wound component are described. In one arrangement, a method of energizing a component with an alternating voltage is provided. The component comprises a coil wound on a magnetic core. The method comprises applying a voltage across the coil that has a first waveform during a first time period and a second waveform during a second time period. The second time period is subsequent to the first time period. The second waveform comprises an oscillating function comprising a sequence of identical waveforms. The first waveform is such that if the coil had zero electrical resistance the variation of flux density in the magnetic core with time would change sign at least once during the first waveform.

    APPARATUS AND METHODS FOR MEASURING ELECTRICAL CURRENT
    2.
    发明公开
    APPARATUS AND METHODS FOR MEASURING ELECTRICAL CURRENT 审中-公开
    VORRICHTUNG UND VERFAHREN ZUR MESSUNG VON ELEKTRISCHEM STROM

    公开(公告)号：EP3123183A1

    公开(公告)日：2017-02-01

    申请号：EP15710581.8

    申请日：2015-03-16

    申请人： Voltech Instruments Ltd.

    发明人： FORD, John Stewart ,  IND, Lionel

    IPC分类号： G01R19/00 ,  G01R27/26 ,  G01R31/02

    CPC分类号： G01R31/027 ,  G01R19/0023 ,  G01R19/0092 ,  G01R27/02 ,  H03F3/087 ,  H03F3/187 ,  H03F3/45475 ,  H03F2200/261 ,  H03F2200/462

    摘要： Methods and apparatus are disclosed for measuring an electrical current, particularly an AC electrical current, for example to measure a frequency response of a transformer. In a disclosed arrangement, a connection is made of a current input terminal for receiving a current to be measured to an input terminal of a differential amplifier via a portion of a resistive network. The resistive network holds the current input terminal at a ground voltage and the two input terminals of the amplifier at a common finite voltage above the ground voltage. The amplifier provides as output a measure of the current to be measured.

    摘要翻译： 公开了用于测量电流，特别是AC电流的方法和装置，例如用于测量变压器的频率响应。 在所公开的布置中，连接电流输入端子，用于经由电阻网络的一部分将待测量的电流接收到差分放大器的输入端子。 电阻网络将电流输入端子保持在接地电压，放大器的两个输入端子处于高于接地电压的公共有效电压。 放大器提供要测量的电流的测量值作为输出。