| 摘要 |
Surge pulses due to residual charges in power factor regulating circuit connected to a three-phase supply could interfere with local computer installations. They are largely eliminated by charging each of the three capacitors in each phase to the max. supply voltage whilst the load is disconnected and reconnecting the capacitors when the supply voltage is near max. after the load has been reconnected. At max. supply, a switch(7) applies a firing potential to the thyristor(6) which will be turned on whilst the supply voltage is below the capacitor voltage.
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