Performance of Large Air Gaps under Lightning Overvoltages: Experimental Study and Analysis of Accuracy of Predetermination Methods
Performance of Large Air Gaps under Lightning Overvoltages: Experimental Study and Analysis of Accuracy of Predetermination Methods
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大气隙在雷击过电压下的性能：预定方法精度的实验研究与分析
DOI：
10.1109/mper.1989.4310640
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发表时间：
1989
期刊：
影响因子：
--
通讯作者：
G. Presavento
中科院分区：
文献类型：
--
作者：
A. Pigini;G. Rizzi;E. Garbagnati;A. Porrino;G. Baldo;G. Presavento
本文总结了CESI最近在雷电过电压下进行的研究结果。对不同的间隙结构和两极的几种脉冲形状进行了测试，以获得与放电发展相关的宏观参数和基本过程的信息。基本目标是拥有一致的数据量，以便对现有模型进行验证和比较，同时提供必要的信息，以支持对基于物理方法的模型进行改进。测试了击穿电压与击穿时间的关系(电压-时间曲线)。这些曲线表明了脉冲形状和构型的重要性，从而说明了计算方法的必要性。提出并讨论了放电参数，以说明脉冲形状特征的相对重要性。将有关排放过程的数据与其他可用数据进行了比较，并根据文献中建议的方法与评估进行了比较。对现有的引线速度公式进行了修正，公式如下：V1=170*d*e(1.5*10-3*U/d)*(U/x-EO)式中，1为速度(m/S)，U为外加电压(Kv)，d为间隙间隙(M)，x为引线未跨越的间隙部分(M)，Eo为50%击穿电压下标准雷电冲击(kV/m)时所考察的结构间隙中的平均梯度。该方程是通用型的，适用于所有构型和不同形状、不同极性的脉冲。
The paper summarizes the results of the research recently carried out at CESI, with lightning overvoltages. Tests were performed on various gap configurations and with several impulse shapes of both polarities to get information about macroscopic parameters and basic processes associated with discharge development. The basic aim was to have a consistent amount of data to carry out a validation and comparison of the existing models, while providing the required information to support the refinement of those based on physical approach. Breakdown voltages versus time to breakdown characteristics, (Volt-time curves), were determined. The curves give an indication of the importance of the impulse-shape and configuration, thus underlying the necessity of calculations methods. Discharge parameters have been presented and discussed to put into evidence the relative importance of the impulseshape characteristics. Data about the discharge process have been compared with other available data and with evaluations according to methods suggested in the literature. A refinement of the available formulas with reference to leader velocity has also been proposed, as in the following: v1 = 170 * d * e(1.5* 10-3* U/d) * (U/x-Eo) where ¿1 is the velocity (m/s), U is the applied voltage (kV), d the gap clearance (m), x the part of the gap unbridged by the leader (m) and Eo the average gradient in the gap of the configuration examined at 50% breakdown voltage with standard lightning impulse (kV/m). The equation is of general type, applicable for all the configurations and for impulses of different shape and polarity.