垂直型接地极在±800kV普洱换流站的应用

Application of Vertical Ground Electrode in ±800 kV Pu'er Converter Station

为满足跨步电压的要求,常规水平浅埋型接地极对极址要求很高,而垂直型接地极可有效解决接地极跨步电压过高的问题,大幅降低极址的选择难度。针对±800 kV普洱换流站接地极的工程实际,分别对采用水平型和垂直型的接地极设计方案进行了仿真计算,结果表明:仅垂直型接地极方案满足接地极跨步电压的设计要求。鉴于垂直型接地极的诸多优点,因此将成为换流站接地极的重要类型之一。

In order to meet the safety requirement of the step voltage, the electrode site for the conventional horizontal earth electrodes is very demanding, but the vertical earth electrodes can effectively lower the step voltage, and greatly reduce the difficulty of searching the electrode sites. This paper based on the ground electrode of -＋ 800 kV Pu＇er converter station, designs both the horizontal and verti- cal programs and calculates the main technical parameters of each scheme. The result shows that only the the vertical earth electrode can meet the design requirement. In view of the advantages of the vertical earth electrode, it will become an important electrode cate- crnrv fnr ^-nnv^rt^r ~tntlnn