进行了现场甩负荷试验，实测了蜗壳压力、机组转速升高、导叶开度的变化过程，分析了爆破膜的工作特性。

Field tests were carried out and the pressure rise, speed rise and the turbine gate opening were measured during load rejections. The Characteristics of safety membranes is analysed.

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若机组关闭规律不变而拐点位置已经进入反“S”区域，蜗壳进口压力将呈现为单峰形态。

If the changeover point of the above closing law is located in the S-shape effect zone, there is only one pressure peak.

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当机组采用先慢后快的两段折线式导叶关闭规律时，蜗壳进口压力只有单峰。

Secondly, if the two-segment closing law, the guide vanes close slowly first and then faster, only one pressure peak will be left.

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