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GEC－ALSTHOM公司制造的励磁调节器在设计时未考虑自动组PT一次高压熔断器熔断和二次回路断线的情况致使蒙达公司3、4号机组发生上述情况时发电机跳闸。通过对励磁调节器切换回路的改进、试验，使切换功能进一步完善，达到了预期效果。
Excitation regulators made by GEC-ALSTHOM were not designed with the automatic high-voltage fuse blowout and disconnection of the secondary circuit of the PT, resulting in tripping of the generator in the event of the above conditions for Unit 3 and Unit 4 of Mengda Company. Through the improvement of excitation regulator switching circuit, test, the switching function to further improve, to achieve the desired results.