No-load magnetizing inrush current suppression method of YNd11 type three-phase transformer
A three-phase transformer and magnetizing inrush current technology, which is applied to emergency protection circuit devices, electrical components, and circuit devices for limiting overcurrent/overvoltage, and can solve problems such as poor magnetizing inrush current suppression effect and increased operation and maintenance costs. , to achieve the effect of good inhibition and easy access
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[0061] Figure 5 In order to build the simulation model, the transformer in this simulation model is a three-phase double-winding transformer group, the rated voltage is 345 / 289kV, the rated capacity is 1209MVA, and the rated no-load current is about 2A. pass Figure 5 The middle I and V collect the current and voltage waveforms of the primary winding of the transformer, control the switch to open and close at different phase angles of the voltage waveform, and observe the current waveform of the primary winding.
[0062] The current and voltage waveforms obtained from the simulation are as follows: Image 6 and Figure 7 shown, by Image 6 It can be seen that the arc extinguishing sequence of the three-phase current is A-C-B. Figure 7 It can be known that the phase angle of the B-phase arc extinguishing voltage is
[0063] Therefore, it can be determined that the three-phase closing sequence of the transformer is B-A(C), and into formula (9), the opt...
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