某电站水泵水轮机尾水管进口不同方位点实测压力比较

Comparison of Measured Pressures at Different Measuring Points at Draft Tube Inlet of a Pumped Turbine

本文以某抽水蓄能电站为依托,对比分析了双机甩负荷工况同一机组同一高程不同方位测点的尾水管进口压力的实测结果,并用移动平均法求得实测均值,将两测点的均值压力与计算值进行对比,得出在同一时刻不同测点的实测总压力是不完全相同的,个别点甚至相差很大,但是用移动法求得的均值压力却比较相近,因此不能通过单个测点的极值压力来判断整个断面的压力,需要对多个测点的压力进行综合分析,来判断机组的安全性。上述分析工作,为确定抽水蓄能电站尾水管进口压力的保证值提供了参考依据。

Based on one pumped storage power station, this paper compared and analyzed the measured pressures at different measured points which are in the same elevation of draft tube inlet in the condition of two units load rejection. Comparison between the mean measured pressures and theoretical calculated results were also performed. It concluded that the draft tube inlet pressures at two different measure points are different. But the mean values at two points are close to the calculated values. Therefore, it is not appropriate to assess the security of the station only according to the measured pressure of single point, it is necessary to analysis the pressures of different measure points. These conclusion can provide a reference for determining the guarantee value of draft tube inlet pressure.