中性点绝缘系统中断路器相间分闸不同期性对燃弧时间概率密度的影响

本文分析了断路器三相分闸不同期性对燃弧时间的影响及三相燃弧时间之间的相互关系。分析表明,不同期性对燃弧时间(区间)的影响的实质,是使加在三个相上的开断负荷不均匀。影响大小不仅与不同期性绝对值有关,而且与不同期性的顺序有关。文章给出了各种不同期性条件下求第一、第二开断相的燃弧时间概率密度的简易方法,提供了23种不同类型不同期条件下的概率密度分布图。

Influence of the Difference between Instants of Contacts Separation during Opening on the Probability Density Functions of Arcing Times

An analysis of influence between the instants of contacts separation during opening on the probability density function of arcing times and the interrerrelation of arcing times between three poles are presented.Analysis indicates that the essintial of the influences is the unbalance of stresses imposed on each pole. The influence is Affected not only by the obsolute values of the differences, but sequences of opened poles.An example for getting the density function of arcing times under certain differences is shown, and 23 figures of density functions under various differences are givep.