我地区有一台260千瓦水轮发电机组,连续两次发生飞车事故,造成定、转子绕组损坏,少发电7～8万度。事故的原因是,事故紧急停机电磁阀的操作回路,由于电站容量小没有设直流电源而采用交流操作(见图1),使电磁阀长期处在过热和振动大的状态下运行,加上得不到及时检修,电磁阀缺陷日趋恶 My area has a 260-kilowatt hydro-generating set, two consecutive speed accidents, resulting in fixed, rotor winding damage, less power 7 to 80,000 degrees. The reason of the accident is that the operation circuit of the emergency stop solenoid valve of the accident adopts the AC operation due to the small capacity of the power station without DC power supply (see Fig. 1), so that the solenoid valve runs under the condition of overheating and vibration for a long time, Less than timely maintenance, solenoid valve defects increasingly evil