METHOD OF CURRENT RECOVERY DISTORTED DUE TO SATURATION OF CURRENT TRANSFORMER (ITS VERSIONS) Russian patent published in 2021 - IPC H02H3/08 H02H7/45 

FIELD: electrical engineering.

SUBSTANCE: method includes separation of undistorted transformation interval and subsequent interval of distorted transformation from process of current change. According to the method, in all three versions the same current network model is accepted with unknown harmonic and constant components. Information on three time moments is involved for their estimation. Two moments are taken at the undistorted transformation interval, the third moment - at the distorted transformation interval. It is in selection of the third moment that the peculiarity of each version is manifested. In the first version, this is the end of the distorted transformation interval. In the second version, moment of distorted current transition through zero value. In the third version, the moment of transition through the zero value of the generated signal is proportional to the unobserved voltage of the transformer model. Recovered current is determined from analytical expressions.

EFFECT: providing simple method of current recovery at saturation of measuring transformer in real time.

3 cl, 6 dwg