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１９９３年５月，天生桥二级水电站的差动式调压井在水轮机甩负荷过渡过程试验中发生升管坍塌事故。为迅速恢复生产，经多方计算论证后将原差动式调压井的升管取消，改为阻抗式的调压井；并在改型后对机组的过渡过程的动态品质进行了观测。作者曾在改型前采用水轮机装置过渡过程基于内特性解析的方法（简称内特性法）对改型的可行性进行了计算论证。本文再一次用内特性法针对现场各种试验情况进行了校核计算，获得了与实测值一致的结果。在此基础之上，还就天生桥二级水电站最不利的运行情况对过渡过程的动态特性进行了预测，并提出了调节元件的合理控制方式，以求得水轮机装置过渡过程最佳的动态品质，改善电厂机组运行的安全、经济、可靠性。
In May 1993, the differential surge shaft of Tianshengqiao Ⅱ Hydropower Station suffered a riser collapse accident during the test of turbine load rejection transition process. In order to resume the production quickly, after the multi-party calculation and demonstration, the riser of the original differential surge shaft was canceled and changed into the impedance type surge tank. The dynamic quality of the unit during the transition was observed after modification. The authors used the method of internal property analysis (referred to as the internal property method) to calculate the feasibility of the retrofit before the retrofit using the hydraulic turbine device. In this paper, once again with the method of internal characteristics of the scene for a variety of test conditions were checked and calculated, obtained with the measured value consistent with the results. On this basis, the dynamic characteristics of the transition process are also predicted for the most unfavorable operating conditions of the Tianshengqiao-Ⅱ hydropower station, and the reasonable control mode of the adjusting elements is proposed to obtain the best dynamic quality during the transition of the turbine unit. Improve safety, economy and reliability of plant operation.