To be precise, it is necessary to know whether the excitation winding is grounded.
1. Test method: Use a multimeter (or megger) to measure the insulation resistance between the field coil and the rotor.
2. Maintenance method: If the magnetic coil is grounded due to slight scratches, it can be simply wrapped and dipped in paint. If an overload causes a short circuit between turns in the winding, rewinding should be considered. Finally, the rotor must also perform dynamic balancing.
1. The Large Shaft End: The large shaft end is the most prone to cracking and fatigue damage on the generator rotor large shaft, so it should be inspected intensively.
2. The middle portion of the large shaft: Cracks and fatigue damage can also occur in the middle portion of the large shaft, andregular fault detection is necessary.
3. Big Shaft Bearing Position: The big shaft bearing position is one of the most important parts of the big shaft of the generator rotor. If cracks or fatigue damage occur, generator operation may be unstable. and even cause an ACCIDENT.
4. The connection between the large shaft and the stator: Cracks and fatigue damage can also occur in the connection between the large shaft and the stator, and regular fault detection is necessary.