Differential protection method based on adaptive ratio braking curve
A differential protection and ratio braking technology, applied in emergency protection circuit devices, electrical components, etc., can solve the problems of easy misoperation, reduced sensitivity, low transformer sensitivity, etc.
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[0055] The technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and through specific implementation methods.
[0056] The differential protection method based on the self-adaptive ratio braking curve proposed by the present invention simultaneously adopts a three-fold ratio braking curve with higher safety and a two-fold ratio braking curve with higher sensitivity (such as figure 1 As shown), it overcomes the disadvantage that the conventional differential protection only uses a single braking characteristic, which leads to the inability to take into account the sensitivity and safety of the protection. The logical coordination relationship between the two characteristic curves is: the start of the phase current sudden change start criterion is used as the timing starting point, T 1 The time protection automatically switches on the two-fold line braking characteristic with high sensitivity, which is used to ...
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