Based upon discuss of the application of frequency-converter in the start, acceleration, exciting model transform and other processes the economic reconstruction plan is introduced for power network.

对同步电机启动、加速、励磁模式切换等工作过程中变频器的应用进行了论述，介绍了电网改造的经济方案，提出了变频器在使用时的注意事项，达到既要节能又要省费用的电网改造效。

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