Patent Document ID: 9246326
Application ID: 13701194
Patent Flag: 1

Claim One:
1. A method for detection of online ferroresonance and determination of a mode of the ferroresonance in a high voltage electrical distribution network, which comprises: overflux detection, which acts as a start element, overflux being set if the flux is greater than a threshold for a specified time duration, mode verification, which is to recognize the modes of the ferroresonance, wherein many frequency components are calculated when an overflux is detected, then many latest values of the frequency components are stored, a stable state or an unstable state being determined first by comparing the sum of the standard deviation of each frequency component and the sum of the expectations of each frequency component, wherein, if the state is unstable and lasts for a specified time duration, the chaotic mode is verified, and wherein if the state is stable, a fuzzy logic is applied to discriminate the ferroresonance modes.