Current transformer saturation detecting method for protecting bus in high voltage network, involves comparing estimated magnetic flux with threshold value, where saturation of transformer is detected while threshold value exceeds flux

摘要

The method involves detecting a fault of a secondary current/voltage waveform of a current transformer. A magnetic flux in the secondary of the transformer is estimated by integration of the secondary current during a time window from the detection of the fault. The estimated magnetic flux is compared with a threshold value, where saturation of the transformer is detected while the threshold value exceeds the magnetic flux. An independent claim is also included for a computer program comprising software adapted to implement a method for detecting saturation of a current transformer.