The line potential energy in the cutset is used as the criterion for monitoring the generator instability, but the criterion has the following two limitations due to narrowly defined conditions. The assumption of an ideal constant power load is difficult to satisfy, and the condition of the critical cutset is too narrow. The limitations are addressed by analyzing the relationship between the power of the load elements and the power of the cutset based on the two-machine equivalent. Modifications of the theoretical derivation steps of this criterion are presented to extend the applications of the criterion and provide theoretical support for its online use. Two simple strategies are proposed to ensure early detection of the generator instability.

割集中的线势能被用作监测发电机不稳定的标准，但由于狭义定义的条件，该标准有以下两个限制。理想恒功率负载假设难以满足，临界割集条件太窄。通过基于两机等效分析负载元件的功率与割集功率之间的关系来解决这些限制。对该准则的理论推导步骤进行了修改，以扩展该准则的应用并为其在线使用提供理论支持。提出了两种简单的策略来确保及早检测发电机的不稳定性。