提出了一种改进的注入方波电压式转子接地保护方案。该方案通过数据采集回路和算法的冗余化提高了保护的可靠性,无需引入励磁电压,保证了运行维护的安全性。根据该方案研制的保护样机其硬件成本得到了有效控制,有利于产品的推广使用。 An improved scheme of injecting square wave voltage rotor grounding protection is proposed. The scheme improves the reliability of the protection through the redundancy of the data acquisition circuit and the algorithm, without introducing the excitation voltage, and ensures the operation and maintenance safety. According to the program developed prototype protection hardware costs have been effectively controlled, is conducive to the promotion of the use of products.