With regard to the transientcalculation of internal faults, the effect of saturation is more serious since the degree of saturation is changed during the fault.
而对内部故障的暂态计算，饱和因素的影响更严重，因为在内部故障的过渡过程中饱和程度也会随时间而变化。
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It includes steady calculation and transientcalculation, and consists of revised single channel model, forced external disturbance model, two-phase boiling model and transient model.
Aimed at pump system, this article investigates the transient characteristics and the influencing factors of the whole system by means of experiment and numerical calculation.