发电机的谐波组开路或短路，无三次谐波电压输出，检查绕组接头或拆换绕组。
If no triple overtone voltage, check the winding lug or replace with another winding.
通过改变励磁电流的大小，得到了基波绕组和三次谐波绕组的空载特性曲线。
The first harmonic winding and harmonic winding no-load property curve are gained when field current is change.
通过改变励磁电流的大小，得到了基波绕组和三次谐波绕组的空载特性曲线。
The first harmonic winding and harmonic winding no-load property curve are gained when field current is change.
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