| The paper studies on the physical process of the second arc current, and establishes the mathematical model of it based on distribution parameters circuit,then utilizes digital simulation software to analyze the important dynamic characteristics of it in all kinds of compensation mode and discusses the factors affecting its size. Started from theory of Hilbert-Huang and transient protection, several aspects of transient protection are displayed in this thesis. This paper discusses HHT principle and improving methods and its applications in transient signal. Through analyzing the effects of the arc's characteristics of the arc to the fault phase voltage, I find the differences between the e almost and the permanent fault. The difference is detected by the characteristics of the energy function of HHT in this paper. Construct a novel non-unit transient current protection scheme. The schemes and algorithms mentioned above were proved to be correct and effective by lots of simulations in this paper. |
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