Transformer operation control apparatus and method for suppressing magnetizing inrush current
A technology of operation control and transformer, which is applied in the direction of emergency protection circuit device, circuit device, emergency protection circuit device, etc. for limiting overcurrent/overvoltage, and can solve pre-arc time error, offset, circuit breaker closing action time Error and other issues
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Embodiment 1
[0024] figure 1 Shown is a block diagram of the transformer operation control device 1 according to Embodiment 1 of the present invention. refer to figure 1 , The transformer operation control device 1 includes a transformer 30 and a circuit breaker 10 .
[0025] The transformer 30 is a three-phase transformer connected in Y-Δ connection. Specifically, the windings on the power supply side of the transformer 30 are connected in a Y connection with the neutral point grounded, and the windings on the load side are connected in a delta connection.
[0026] The circuit breaker 10 is connected between the line of the power system including each phase of the R phase 1R, the S phase 1S, and the T phase 1T, and the transformer 30 . The circuit breaker 10 includes: arc extinguishing chambers 11R, 11S, 11T provided with the contacts 13R, 13S, 13T; and operating devices 12R, 12S, 12T for switching the contacts 13R, 13S, 13T. In order to independently switch the contacts 13R, 13S, and...
Embodiment 2
[0091] Example 2 differs from Example 1 in the determination conditions for confirming the suppression effect of the field inrush current. In the second embodiment, the on-time T1on of the current of the first on-phase is actually detected, and the deviation from the target on-time T1target is determined. When the difference between the actual on-time T1on and the target on-time T1target is not within the allowable range, since the residual magnetic flux of the first on-phase at the time of turning on is different from the steady magnetic flux, an excitation inrush current is generated.
[0092] Figure 9 Shown is a block diagram of a transformer operation control device 1A according to Embodiment 2 of the present invention. Figure 9 The operation control device 1A includes a turn-on timing determination unit 87 instead of the excitation rush current determination unit 86, which is the same as figure 1 The operating control devices are different. also, Figure 9 The opera...
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