| 摘要 |
In a high voltage d-c transmission system having more than two converter stations for establishing a multipoint power supply, the stations working in rectifier and inverter operation respectively at opposite ends of the transmission line are provided with the usual current, voltage and extinction angle regulators which operate, under normal conditions in the system, along a certain characteristic curve. In the event of a short-circuit in the d-c mains, the station regulators are changed over for operation along a different characteristic curve with reduced nominal current and voltage values in order to support the cut-off process of the d-c switches.
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