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首页> 外文期刊>Dielectrics and Electrical Insulation, IEEE Transactions on >Evaluation of overshoot rate of lightning impulse withstand voltage test waveform based on new base curve fitting methods
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Evaluation of overshoot rate of lightning impulse withstand voltage test waveform based on new base curve fitting methods

机译：基于新的基本曲线拟合方法评估雷电冲击耐受电压测试波形的过冲率

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摘要

The k-factor, which evaluates an overshoot of the withstand voltage test waveform in a lightning impulse withstand voltage test, is about to be adopted in IEC 60060-1 that specifies high-voltage test techniques for electric power equipment. In its procedure, it is defined that the recorded waveforms are fitted with a double exponential function to derive a base curve. For some waveforms, however, an extracted base curve sometimes deviates upward from the central lines of the recorded waveforms in the wavefront area. In particular, the degree of such dissociation is significant in waveforms with a high overshoot rate and a low frequency, and further it can not be said that the base curve is appropriate in terms of insulating properties. Accordingly, such significant dissociation may result in an irrational calculation of the overshoot rate. To resolve these problems, a numerical equation resulting from a relationship of a solution between an equivalent electric circuit and dominant equation was used, and fitting methods were overviewed in order to extract a more reasonable base curve in previous studies. In this paper, various options from these fitting methods were narrowed down to several options, which were then applied to simulated recorded-waveform; for which the overshoot rate and frequency of superimposed oscillating served as parameters, and a fitting method for extracting a more reasonable base curve was examined. Consequently, the calculation results of the overshoot rate were brought closer to their actual values than with the existing method by using a new base curve extraction method by which the fitting can be performed with removing the oscillatory part from the recorded waveform. While there is significant dissociation in the existing method, especially in the waveform on which a relatively low frequency oscillatory wave is superimposed, evaluation results of the overshoot rate were significantly improved as a result of the use of the new base curve e-n-nxtraction method. In the meantime, it should be noted that the k-factor filtering scheme was implemented after the application of various fitting methods resulted in the shape parameters of the test voltage waveforms, such as crest value, wavefront and wavetail durations, emerging as virtually identical, alongside confirmation of the minor effect of the fitting methods on the test voltage waveform.
机译：IEC 60060-1将采用k因子来评估雷电冲击耐受电压测试中的耐受电压测试波形的过冲，该标准规定了电力设备的高压测试技术。在其过程中，定义为所记录的波形具有双指数函数，以得出基本曲线。但是，对于某些波形，提取的基本曲线有时会从波前区域中记录的波形的中心线向上偏离。特别地，这种离解的程度在具有高过冲率和低频的波形中是显着的，并且不能说基本曲线就绝缘特性而言是适当的。因此，这种明显的解离可能导致过冲率的计算不合理。为了解决这些问题，使用了由等效电路和主导方程之间的解的关系得到的数值方程，并且概述了拟合方法，以便在先前的研究中提取出更合理的基础曲线。在本文中，将这些拟合方法中的各种选项缩小为几个选项，然后将其应用于模拟记录波形；为此，研究了叠加振荡的过冲率和频率作为参数，并研究了提取更合理基曲线的拟合方法。因此，通过使用新的基本曲线提取方法，过冲率的计算结果比现有方法更接近其实际值，通过该方法可以在从记录波形中去除振荡部分的情况下进行拟合。尽管在现有方法中存在明显的分离，尤其是在叠加了相对低频振荡波的波形中，但由于使用了新的基本曲线e-n-ntraction方法，过冲率的评估结果得到了显着改善。同时应注意的是，在应用各种拟合方法导致测试电压波形的形状参数（例如波峰值，波前和波尾持续时间）几乎相同之后，实施了k因子滤波方案，确认拟合方法对测试电压波形的微小影响。

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