中文摘要：

比例共享原则是目前最具权威和最常用的界定节点电气量分配关系的基本原则，许多学者将它视为研究其它若干问题的理论基础。然而，研究表明，此原则对电力网络分析而言并不完备，由此原则分析获得的结论在不同场合并不完全一致。针对此现状，从交流支路和节点联合电气剖分的角度对节点电气量分配关系进行论证，并对比例共享原则的不完备性进行分析，指出单纯由比例共享原则分析获得的结果在不同场合并不完全一致的原因。结论表明，节点电气量的分配关系虽满足比例共享原则，但仅限于分析节点上的电气交换关系，对交流支路及交流电力网络源流间的电气交换关系，则需从交流支路和节点联合电气剖分的关系入手进行。

英文摘要：

At present, the proportional sharing principle is the most authoritative and the most common used basic principle that is used to restrict the allocation relationship of bus electric variables. Many scholars treat the proportional sharing principle as a theory foundation to study some other problems. However, researches show that the principle is not complete for analysis of electric power network and conclusions obtained from the principle are not complete coincident. For this actuality, this paper does new proof on the allocation relationship of bus electric variables from the point of untied electrical dissection of AC branch and bus, analyzes non-completeness of the proportional sharing principle, and points out the reasons why conclusions obtained from the principle are not complete coincident. Analysis conclusions of this paper show that the allocation relationship of bus electric variables satisfies the proportional sharing principle but it is only limited to analyze interchange relationship of bus electric variables. For analyzing exchange relationships of sources and flows of AC branch or AC electric power network, it is needed from the point of untied electrical dissection of AC branch and bus.