1. Why does a generator not produce electricity? 1. The residual magnetism of the generator core has disappeared or is too weak. Newly installed units subjected to long-distance transportation vibrations or the generator being stored for too long can cause the residual magnetism in the generator core to disappear or weaken, leading to the loss of residual magnet voltage or a voltage below the normal residual magnet value, i.e., residual magnet line voltage less than 10V, and residual magnet phase voltage less than 6V. Due to the vibration received after the励磁 cores of synchronous generators and AC excitation machines are assembled from silicon steel sheets (1-1.5mm thick), residual magnetism is easily lost or weakened, directly resulting in the inability to produce current during normal operation, causing the generator to fail to generate electricity. 2. Incorrect wiring in the excitation circuit. During the maintenance of the generator set, a mistake was made in reversing the polarity of the excitation winding, which, upon power-on, resulted in the magnetic field generated by the excitation winding's current opposing the residual magnetism, causing it to消失. Additionally, during maintenance, not paying attention to the polarity when measuring the DC resistance of the excitation winding or testing the automatic voltage regulator (AVR) when passing DC current through the excitation winding can also cause the residual magnetism in the core to disappear. Such cases are usually due to operational errors at the factory, and can be directly addressed by contacting the manufacturer for repair. 3. Open circuit in the excitation circuit. Poor electrical contact in the excitation circuit of the generator set, loose connections at the electrical components, broken wires, or disconnections can cause an open circuit, resulting in the lack of excitation current in the generator's excitation winding.