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介绍了因自动励磁调节器 (AVR)故障 ,过电压、过励磁保护设置不完善 ,以及整定欠合理而导致发电机、主变压器严重过电压和过励磁的实例 ;对微机型 AVR的过励磁或过电压、励磁过电流、低励磁限制和保护整定计算进行了探讨 ;提出了为完善以上保护功能 ,确保发电机、主变压器的安全运行而改进过励磁和过电压保护的措施。
The examples of AVR fault, overvoltage and over-excitation protection are not set well, and the setting is not reasonable, the serious over-voltage and over-excitation of generator and main transformer are introduced. Or over-voltage, over-current excitation, low excitation limit and protection setting calculation are discussed. The measures to improve over-excitation and over-voltage protection are proposed to improve the above protection function and ensure the safe operation of generator and main transformer.