Locking method for preventing differential protection maloperation of transformer caused by sympathetic inrush current
A technology for differential protection and transformers, applied in emergency protection circuit devices, electrical components, etc., can solve problems such as malfunction, power system accidents, transformer differential protection refusal, etc., to eliminate refusal or maloperation, steps Optimize and improve the effect of working mode
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[0035] The technical solutions and technical effects of the present invention will be further described in detail below in conjunction with the accompanying drawings of the present invention.
[0036] like Figure 1-Figure 4 As shown, the present invention provides a blocking method for preventing maloperation of transformer differential protection caused by inrush current, which specifically includes the following steps:
[0037] Step S1, calculate the three-phase differential current value of the transformer, refer to figure 2 The wiring shown is analyzed.
[0038]
[0039] Step S2, judging the phase θ of the second harmonic in the differential current when the transformer occurs and should inrush 2 Phase θ with 2 times the fundamental current 1 whether there is a phase difference between them. Specifically, the basis for whether there is a phase difference is: calculate the second harmonic phase θ when the transformer occurs and should inrush 2 Phase θ with 2 times...
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