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首页> 外文会议>Electrical Insulation Conference and Electrical Manufacturing Expo, 2005. Proceedings >Modeling of magnetic field diffusion phenomena in a CVT
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Modeling of magnetic field diffusion phenomena in a CVT

机译：CVT中磁场扩散现象的建模

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摘要

In a current viewing transformer (CVT), current flows through a wire that is surrounded by a toroid-shaped core on which a secondary is wound. The magnetic field associated with this primary current propagates as a wave and can couple into the secondary circuit; however, it moves as a diffusion front through the core material. Modeling of the diffusion of the magnetic field through the core determined that it affects the magnitude and time signature of the voltage induced in the secondary winding when the primary current is produced by a capacitor discharge. During the quarter cycle rise time (227 ns) of the current pulse in the primary, a step response to an incident magnetic field would yield 95.57 percent of the steady state magnetic flux. Since the voltage induced in the CVT secondary is proportional to the time derivative of the magnetic flux, time delay would further distort the CVT current measurement.
机译：在电流观察变压器（CVT）中，电流流过一条导线，该导线被环形磁芯围绕，并在其上缠绕了一个次级线圈。与该初级电流相关的磁场以波的形式传播，并且可以耦合到次级电路中。但是，它作为扩散前沿穿过核心材料。通过铁心的磁场扩散模型确定，当通过电容器放电产生初级电流时，它会影响次级绕组中感应电压的大小和时间特征。在原边电流脉冲的四分之一周期上升时间（227 ns）内，对入射磁场的阶跃响应将产生稳态磁通量的95.57％。由于在CVT次级中感应的电压与磁通量的时间导数成正比，因此时间延迟将进一步使CVT电流测量失真。

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