| 摘要 |
A synthetic test circuit for testing of an HVDC-valve (Vt) has a current source (CUS), a voltage source (VOS), and a voltage oscillating circuit. The voltage oscillating circuit has an inductor (L2) and a first capacitor (Cs), the first capacitor for supplying an injection current (Iinj) through the HVDC-valve, and for imposing a forward blocking voltage and a reverse recovery voltage on the HVDC-valve. The voltage oscillating circuit comprises first means (Va5) for creating an oscillating current path (L2 - Cs - Va5) through the inductor and the first capacitor for a polarity change of the voltage of the first capacitor from reverse recovery voltage polarity to forward blocking voltage polarity, said current path being de-coupled from the voltage source during said change of polarity of the first capacitor, a second capacitor (C2), connected across the voltage source, and second means (Va2) for coupling the second capacitor to the first capacitor via the inductor when the voltage of the first capacitor has the same polarity as the polarity of the voltage source. |
