用三相模型计算单相电弧闪络入射能量

A. Majd, R. Luo, Marvin Antony Devadass
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引用次数: 0

摘要

IEEE 1584方程不包括单相故障,因为它假设大多数单相故障升级为本标准适用的三相故障。如果将IEEE 1584方程用于单相故障,则基于标准的结果将是保守的。大多数短路、故障计算的参考资料都涵盖了三相系统。然而,有许多商业和工业系统是单相的。也就是说,它们要么从单相电源馈电,要么从三相系统分支。这些系统也可能出现故障和电弧闪光,因为没有好的参考来覆盖它们。由于缺乏现有的工作,单相系统的故障电流计算可能比三相系统更具挑战性。本文提出了一种通过三相模型来模拟单相系统故障的方法。该方法是有用的,因为一旦等效的三相模型被创建,故障和电弧闪光的计算可以像任何其他三相系统一样执行。即利用器件曲线和计算得到的电流即可得到入射能量。该方法的范围、限制和细节将通过一些例子来介绍。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Calculating the Arc Flash Incident Energy in Singlephase Systems using a Three-Phase Model
IEEE 1584 equations do not cover single-phase faults based on the assumption that most of them escalate to a three-phase fault for which this standard applies. If IEEE 1584 equations were used for a single-phase fault, the results would be conservative based on the standard. Most of the short circuit, and fault calculation reference material cover three phase systems. Nonetheless, there are many commercial, and industrial systems, which are single phase. That is, they either feed from a single-phase source, or branch off a 3-phase system. These systems can, too, experience faults, and arc flash, where there aren’t good references to cover them. Fault current calculations in single phase systems can be more challenging than a three-phase system due to lack of existing work. In this paper, we present an approach to simulate faults in single-phase systems through a three-phase model. The method is useful since once the equivalent 3-phase model is created both fault, and arc flash calculations can be performed like any other three-phase system. That is, the device curve and the calculated current can be used to obtain the incident energy. The scope, limitations, and details of the method will be presented with some examples.
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