Thispaper describes a zero-setting power-swing blocking protection method that isindependent of network parameters and is based on monitoring theline swing-center voltage rate of change. The new method doesnot require any stability studies or user settings for theproper blocking of relay elements that are prone to operateduring stable or unstable power swings.
Hou, D. (2005). Zero-setting power-swing blocking protection. In 3rd IEE International Conference on Reliability of Transmission and Distribution Networks (RTDN 2005) (Vol. 2005, pp. 249–254). IEE. https://doi.org/10.1049/cp:20050047