中文摘要：

为了保证长引水系统冲击式水电站调压井安全运行，描述了调压井及冲击式水轮机的数学模型，并阐述了水电站特征线算法；从电站工作的机理出发，建立了某冲击式水电站在过渡过程模拟计算中的数学模型，给出了调压井在3种不同进水池水位下，最不利运行工况的过渡过程中，调压井水位的变化情况及系统压力的波动，确定了保证水电站安全运行调压井不会流空。

英文摘要：

The mathematical model of surge tank and impulse turbines are studied in this paper and the characteristic line algorithm is used to calculate the hydropower station transient .From the working mechanism of the unit ,this paper establishes a mathematical model of the transition process of impulse hydropower station with surge tanks ,and the surge tank is simulated at three different wa-ter levels of suction sump under the most adverse operating conditions .The results show that if the water level of suction sump is not less than the lowest storage level ,the surge tank will not be empty ,which can ensure the safe operation of the units .