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Fast Commutation of DC Current into a Capacitor Using Moving Contacts
IEEE Transactions on Power Delivery ( IF 4.4 ) Pub Date : 2020-04-01 , DOI: 10.1109/tpwrd.2019.2919725
Dragan Jovcic

This paper describes a method of fast commutation of DC current into a capacitor. Theoretical study is provided, which enables evaluation of commutating DC current for the given contact velocity, capacitance, and dielectric strength. It is concluded that a non-zero contact velocity at separation is required, and a corresponding switch design is proposed. Experimental results on a laboratory setup illustrate successful DC current commutation up to 400 A, with voltages rising to 1.3 kV. Further experiments demonstrate that parasitic parameters reduce the magnitude of the current that can be commutated. A detailed non-linear PSCAD model and a linear model for the parasitic circuit are presented to enable prediction of the success of commutation. The model accuracy is confirmed with experimental tests. The DC current commutation in the proposed method occurs 5–10 μs after the contact separation, which is much faster than with other methods employing moving contacts. A further benefit of the extremely short arcing is the elimination of thermal issues on contacts, and possible simplified design of the mechanical switch.

中文翻译:

使用移动触点将直流电流快速转换为电容器

本文介绍了一种将直流电流快速转换为电容器的方法。提供了理论研究,可以评估给定接触速度、电容和介电强度的换向直流电流。结论是分离时需要非零接触速度,并提出了相应的开关设计。实验室设置的实验结果表明,高达 400 A 的直流电流换向成功,电压升至 1.3 kV。进一步的实验表明,寄生参数会降低可换向的电流幅度。提供了详细的非线性 PSCAD 模型和寄生电路的线性模型,以预测换向成功与否。通过实验测试证实了模型的准确性。所提出的方法中的直流电流换向在触点分离后 5-10 μs 发生,这比使用移动触点的其他方法快得多。极短电弧的另一个好处是消除了触点上的热问题,并可能简化机械开关的设计。
更新日期:2020-04-01
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