The meaning of generator reactance percentage

The synchronous reactance of a synchronous motor is composed of leakage reactance and armature reaction reactance. The size of the same frequency reactance affects the magnitude of the terminal voltage change with the load and the stability of the parallel connection. Approximate values ​​are measured using no-load characteristics, short circuit characteristics and short circuit ratio tests. The short-circuit characteristic refers to the relationship between the stator current and the excitation current when the generator is short-circuited at the rated speed. Short circuit ratio refers to the ratio between the excitation current at rated no-load voltage and the excitation current at rated three-phase short circuit current. Based on the same excitation current, the corresponding potential (no-load voltage) when the three-phase rated short-circuit current is generated can be calculated. Once the potentiall divided by the current, the reactance can be obtained, but it is necessary. to be multiplied by the saturation coefficient 1.1 ~ 1.2.