Radio interference (noise) is generated in HVDC converter stations due to the rapid breakdown of the voltage between anodes and cathodes of the converter valves during valve ignitions. These breakdowns cause steep current pulses to be injected in the system resulting in high frequency radiation from the valves, from the equipment in the switchyard and from the outgoing lines. Factors influencing the radio interference level and means for its reduction are discussed in the paper. Interference in the frequency range from 0.1 to 10 MHz is analyzed.
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S.A. Annestrand (1972) studied this question.
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