The poster's problem should be that the voltage emitted by the 80 kilowatt generator is not 400V, but 300V. It is a phenomenon of low voltage of the generator set.
Reference causes of low output voltage of generator set
① The speed of the engine (common diesel engine or gasoline engine) is too low, causing the electric potential induced by The generator stator winding is too weak.
This may be caused by using a motor from an irregular manufacturer, or it may be caused by a motor failure that makes the speed too low.
②The stator winding wiring is incorrect, the induced potential is low, and even the three phases are unbalanced.
③ The wiring of the excitation winding is incorrect, and the polarity of some adjacent magnetic poles is not connected to N or S, which greatly weakens the excitation magnetic field of the motor and Dnd the induced voltage of the low generator. .
④ The short circuit between the turns of the excitation winding weakens the magnetic excitation potential of the motor and lowers the induced voltage of the generator.
⑤The voltage generated by the exciter is too low.
How to deal with the low output voltage of the generator set
① Quickly adjust the speed of the main motor of the synchronous generator to reach the rated value.
② Correct the stator wiring according to the drawings.
③ In case of incorrect wiring of the excitation winding, a self-test method or a north-south magnetic needle can be used to identify the wrong polarity and correct the wiring.
④ For a short circuit between turns of the field winding, first measure the AC impedance of a single winding. If the difference is more than double, it should be suspected that the low impedance winding has a short circuit. , and a youshort-circuit st must be carried out additionally on the single winding.
⑤ If the exciter voltage is too low, check it and treat it according to the above items.
The poster can exclude them one by one according to the above.