| In his paper, mathematical analysis method is used, according to the power flow equation and continuity equation and momentum equations to take into account the impedance of the head loss entry hole is derived to calculate impedance surge chamber, cylinder.type surge tank limit surge mathematical expression, and in accordance with the expression analyzed and discussed the various factors that affect the value of surge chamber swell the size of a number of factors. Hydropower hydraulic pressure diversion system to correctly analyze the transition process is a diversion hydroelectric power generation system design and optimization of the key to safe and stable operation. In this paper, the pressure of the water diversion type hydropower station hydraulic transient analysis of a mathematical model and various boundary conditions, including the inlet boundary, bifurcation control the border, impedance surge chamber boundaries, new modular surge chamber borders and boundaries turbine give full consideration to the unit speed flow of the impact of change on the turbine, which is more in line with the characteristics of Francis turbine to ensure the correctness of the results achieved hydropower pressurized water system, two kinds of non.steady flow problems of joint calculations, fundamentally has changed in the past to consider separately these two phenomena caused by analytical error, such calculations more in line with hydroelectric water diversion systems pressurized the internal laws of the transition process. In this paper, an engineering example, innovative we propose a differential impedance and the surge chamber features a new modular surge chamber, and based on this proposed work of the surge tank to measure the strengths and weaknesses of the two "ideal "; and traditional impedance surge chamber, compared with a reduction in project cost advantages.
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