Current transformer saturation recognition method for differential protection
A current transformer and differential protection technology, which is applied in the field of relay protection of power systems, can solve problems such as difficult to accurately set the percentage of harmonic content, large dispersion of derivative or differential calculation results, and inability to quickly open differential protection, etc., to achieve The effect of fast recognition speed, small calculation amount and strong anti-interference ability
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[0045] The embodiments of the present invention will be described in further detail below in conjunction with the accompanying drawings and examples, but not as a limitation to the scope of protection of the present invention, all technical solutions obtained by means of equivalent replacement or equivalent transformation are within the scope of protection of the present invention Inside.
[0046] According to the method of the present invention, in the current differential protection device, the saturation identification process of the current transformer is carried out by using the half-cycle integral feature of the differential current sampling value as follows: figure 1 shown. figure 2 , image 3 They are the secondary current and differential current waveform diagrams of current transformer saturation for internal faults and external faults respectively. It can be seen that there are obvious distortions and defects in the differential current waveform after the current...
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