【摘 要】
：
Transient DC voltage measurement error has been observed several times ever since Xiangjiaba--Shanghai ±800 kV UHVDC project started its commercial operation.
【机 构】
：
State Grid Operation Company,ABB China
论文部分内容阅读
Transient DC voltage measurement error has been observed several times ever since Xiangjiaba--Shanghai ±800 kV UHVDC project started its commercial operation. The measurement error causes considerable disturbances to the AC networks. By analyzing the time frequency record, simulating faults at different positions of the divider, and testing the gas in voltage dividers, the fault is located and then is proved to be some partial discharges inside DC voltage dividers. The reason of the internal flashes and the solution to the problem is also discussed in this paper. The conclusion is that instead of N2 , SF6 should be used for the internal insulation of high voltage DC voltage dividers.
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