| 摘要 |
An apparatus and a method for predicting future behavior of an asymmetric fault current in a current path (2). The apparatus comprises: a member (1) adapted to continuously sample the current in the current path and to save sampled values of the current in a moving sampling window, a predictor (4) arrange-ment adapted to predict future values of the current in the cur-rent path based on the sampled current values and a mathe-matical model of the current, and a fault current detector (5) adapted to compare the predicted current values with sampled current values from the same point in time, and on basis thereof determined whether or not a fault current has occurred in the current path, and said member (1) is adapted to, upon detecting a fault current, adjust the sampling window to discard current values prior to the fault current, and that said predictor (4) ar-rangement is adapted to predict future values of the fault current based on the current values in the adjusted sampling window. |
