Synchronous switch
A synchronous switch and contact technology, used in reactive power compensation, reactive power adjustment/elimination/compensation, etc., can solve problems such as high cost, reduced reliability, and large conduction loss of thyristors
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[0016] Combine below figure 1 Describe a specific implementation of the present invention:
[0017] When the capacitor is put in, the control circuit first measures the zero-crossing point of the AC phase line voltage. If the closing action time of the magnetic latching relay is 5 milliseconds, the closed driving signal of J1 and J3 will be sent out 5 milliseconds after the zero-crossing point is measured, so J1 The contact with J3 is closed at the next zero crossing of the AC phase line voltage. Then 5 milliseconds after the zero-crossing point of the B-phase voltage, the J2 closing drive signal is sent out, so the J2 contact is closed at the zero-crossing point under the B-phase phase voltage. This is the synchronous operation when the capacitor is put in, so as to achieve no inrush current of the capacitor. Invest.
[0018] When the capacitor is cut off, the control circuit first measures the zero-crossing point of the B-phase voltage. If the disconnection time of the magnetic ...
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