1. maintenance cycle

minor repairs:-once a year.

Overhaul: The stator winding of large-flow submersible motor is insulated from the ground, and the resistance is lower than 0.5MΩ or the motor must be carried out after frequent actions of lean oil protection (500V shaking table is used for insulation measurement).

2. minor repair maintenance methods, quality requirements and process requirements

1. Whether the motor lead wire (outside the starting switch) and the wiring screw are loose or overheated, whether the insulation is damaged, and the lean oil protection circuit operates normally. Because the lean motor is easy to cause water into the motor burning accident.

2. All motors with lean oil shall be lifted out and qualified transformer oil shall be added.

3. Oil injection method; Hoist the motor or pad it flat and upright (pay attention to prevent dumping and hurting people). First tighten the oil pressure spring to a tight state, repair the high-voltage submersible motor, then open the oil plug at the top of the motor, and slowly inject oil into the machine. Tighten the oil plug after filling the oil, remove the screw to loosen the spring. At this time, oil pressure is generated in the machine. In order to eliminate the residual gas in the machine, loosen the oil plug to exhaust naturally. When there is no air discharge sound, the exhaust is completed when the oil spills. Add oil to large flow submersible motor; 150A motor h 2 150±5lllm,200 and 250B motor h: 110±5mm, see appendix d.

4. If the insulation of stator coil of large flow submersible motor is 5 ~ 100MΩ, the insulation resistance can be improved by new oil change, which should be greater than 100MΩ.

5. Reset the large flow submersible motor.