Consider of using the changing unit of the ratio of 3rdharms got from G-term and N-point to do the Stator Ground Fault protection during the Stator Ground Fault accident, it can be quicker, can do better protection.

• 提出用三次谐波电压的比值的变化量来监视定子接地保护，此种方法可以提高保护的动作速度，提高保护的灵敏性和可靠性。