Sampling point differential protection misoperation prevention method
A technology of differential protection and sampling points, which is applied in the direction of automatically disconnected emergency protection devices, emergency protection circuit devices, electrical components, etc., can solve problems such as misoperation and excessive DC component attenuation, and achieve improved reliability and enhanced Effects on Stability and Reliability
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 The specific embodiments of the present invention will be further described below in conjunction with the drawings.
 For regional faults, the absolute value of most sampling points of the differential current and braking current is basically the same, and the absolute value of the current sampling value after the difference is also basically the same. When an out-of-area fault is accompanied by CT transient saturation and the non-saturated CT current is large and contains a large DC component, the differential operation can basically eliminate the attenuated DC component in the differential current, highlighting the discontinuity of the differential current; while for the braking current, Due to the contribution of the non-saturated CT current, there will be no discontinuity after the differential, and it can effectively play a braking role at the discontinuity of the differential current. Therefore, the present invention first performs differential element calcula...
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