A new and precise method for rapid voltage changes (RVC) detection and analysis is introduced by IEC 61000-4-30: 2015. In this paper, the definitions and international regulations on RVCs are reviewed. The results of RVCs using the traditional measuring methods based on IEC 61000-3-3: 2013 and the recommended method in the new IEC 61000-4-30 are compared. The new method is more suitable for the measurement of RVCs in engineering practices.