The remaining magnetic flux of the generator core disappears or is too weak, causing vibration during long-distance transportation of the new machine. If the generator is placed for too long, the remaining magnetic flux voltage of the generator disappears or is less than the normal remaining magnetic flux voltage. That is, the residual flux line voltage is less than 10V, and the residual flux phase voltage is less than 6V. The stator and rotor cores of synchronous generators, as well as those of AC exciters, are usually overlapped and stamped with 1-1.5mm thick silicon steel sheets. Excitation can easily cause residual magnetism to disappear or weaken.

勵磁回路接線不正確。修理發(fā)電機時，勵磁繞組的極性意外逆轉(zhuǎn)。通電后，由勵磁繞組的電流中產(chǎn)生的磁場向剩馀磁化的反方向移動，剩馀磁化消失。此外，如果在維護過程中測量勵磁繞組的DC電阻，或者在沒有考慮極性的情況下測試自動調(diào)節(jié)器AVR勵磁繞組的DC電流，鐵心的剩馀磁通就會消失。

The excitation circuit wiring is incorrect. When repairing the generator, the polarity of the excitation winding unexpectedly reversed. After being energized, the magnetic field generated by the current in the excitation winding moves in the opposite direction of residual magnetization, and residual magnetization disappears. In addition, if the DC resistance of the excitation winding is measured during maintenance, or the DC current of the AVR excitation winding of the automatic regulator is tested without considering polarity, the residual magnetic flux of the iron core will disappear.

勵磁回路堵塞，發(fā)電機勵磁回路電氣接觸不暢，各種電氣部件連接器松動，導線斷開，電路中斷，交流發(fā)電機勵磁繞組不再有勵磁電流流過。

The excitation circuit is blocked, the electrical contact of the generator excitation circuit is not smooth, the connectors of various electrical components are loose, the wires are disconnected, the circuit is interrupted, and there is no longer excitation current flowing through the excitation winding of the AC generator.

旋轉(zhuǎn)整流器的DC側(cè)電路被切斷。由于旋轉(zhuǎn)整流器直流側(cè)電路的斷路，勵磁機經(jīng)旋轉(zhuǎn)整流器整流后，提供給勵磁繞組的勵磁電流不再輸送給勵磁繞組，交流同步發(fā)電機無法發(fā)電。

The DC side circuit of the rotating rectifier is cut off. Due to the open circuit in the DC side circuit of the rotating rectifier, the excitation current provided to the excitation winding is no longer transmitted to the excitation winding after the exciter is rectified by the rotating rectifier, and the AC synchronous generator cannot generate electricity.

由于交流勵磁機故障，沒有輸出電壓。由于交流勵磁機不能產(chǎn)生電壓，所以交流同步發(fā)電機的勵磁繞組中沒有勵磁電流。

Due to a malfunction of the AC exciter, there is no output voltage. Due to the inability of the AC exciter to generate voltage, there is no excitation current in the excitation winding of the AC synchronous generator.

發(fā)電機勵磁繞組損壞或接地。極低發(fā)電機的無勵磁電流或勵磁電流。

The excitation winding of the generator is damaged or grounded. The non excitation current or excitation current of an extremely low generator.

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