Transformer zero-sequence differential protection algorithm based on standardized graph similarity matching recognition
A graphic similarity, differential protection technology, applied in emergency protection circuit devices, parts of emergency protection devices, emergency protection data processing devices, etc., can solve the misoperation of zero-sequence differential protection and affect zero-sequence differential measurement Current accuracy, inability to eliminate problems such as zero-sequence differential protection misoperation, etc., to achieve the effects of flexible layout, strong resistance to data loss, and high reliability
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[0031] Such as Figure 5 As shown, the transformer zero-sequence differential protection algorithm based on standardized graph similarity matching recognition includes the following steps:
[0032] Step 1: Obtain the transformer neutral line TA at a certain sampling rate to measure the zero-sequence current sequence I n0 (k), collect the three-phase TA measurement current sequence on the Y side of the transformer and add the three-phase current in the zero-sequence differential protection device to form a self-produced zero-sequence current sequence I self0 (k), using the difference between the self-produced zero-sequence current sequence and the neutral line zero-sequence current sequence to form a zero-sequence differential current sequence I diff (k), where k∈{1,2,3,...,n}, n is the number of sampling points in one cycle;
[0033] Step 2: Judgment 3I n0 > I REF Whether it is established, where I REF is the reference value of the neutral line current of the transformer;...
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