关键词: 汽轮发电机组, FCB试验, 转子转动惯量, 常规甩负荷试验

Abstract: The moment of inertia of turbine rotor is mainly measured and obtained from the computing of load-rejection tests. Now that the fast cut back (FCB) tests are carried out in many power plants which can also be applied for the assessment of the dynamic characteristics of steam turbine control systems, most of the plants would like to do the FCB test only while the objective of load-rejection tests reached as well due to the harmful effect of destructive FCB tests or regular load-rejection tests on the steam turbine rotors. So far, there has been no method proposed for calculating the rotor moment of inertia by FCB tests. In this paper, the regular method to calculate the moment of inertia based on load-rejection tests is explained and then the new method based on FCB tests is proposed. The comparisons between the two methods are conducted afterwards, which indicates that the difference between the two computing results is as low as 1.29%. In conclusion, the method based on FCB tests is qualified substitute for load-rejection tests.

Key words: steam-turbo generator, fast cut back (FCB) test, moment of inertia of turbine rotor, load-rejection test