ALTERNATOR REWINDING 1000KVA

At Istanbul anchorage.

Disassembly, marking and removing the alternator tips and positions on the ship.

Moving inside the ship and bring to the installation place is under crew responsibility with the supervision of our team.

Taking the alternator to the deck using appropriate equipment. Vessel crane used.

Inspection photos at workshop:

Inspection result:

1. Main Stator:

- An explosion between phases under load, which is likely due to the main stator insulation weakness.

- The explosion continued within the core lamination pack, causing damage to approximately 75% of it.

- In this case, after the windings are removed:

- The lamination pack will be dismantled and distributed. The damaged portions will be replaced with newly cut laminations and reassembled.

- Subsequently, rewinding will be carried out.

- Stator damages are visible in photos labeled Stator 1, 2, 3, 4, and 5.

2. Main Rotor:

- The insulation materials of the coils on the main rotor were burned as a result of the stator explosion. Copper fragments have adhered/plastered to various locations.

- After the tests, it was seen that there was insulation damage and a short circuit between the coils.

- One coil was removed, the places that came to the metal supports were burned and it touched the chassis. Rewinding is necessary.

- Rotor damages are visible in photos labeled Rotor 1, 2, 3, and 4.

3. Exciter Stator:

- The exciter stator was damaged during the stator explosion and requires rewinding.

- Damages can be seen in photos labeled Exciter Stator 1 and 2.

Conclusion:

- Main Stator: Lamination pack repair and rewinding are necessary. The lamination pack repair is not included in our current quotation, so both the price and delivery time will change.

- Main Rotor: Rewinding is required. not included in our current quotation. Delivery will be completed during the stator repair period.

- Exciter Stator: Rewinding is required. Delivery will be completed during the stator repair period.

Job Scope agreed:

- Stator:

- Removing and documenting stator winding schematics.

- Dismantling and distributing the lamination pack, cutting new laminations, and reassembling.

- Cleaning the core and testing for magnetic short circuits.

- Rewinding according to the schematic using H-class insulation materials.

- Applying hot dip varnish using an oven.

- Replacement with New bearing 6328M.C3

- Main and Exciter Rotor:

- Rewinding and dynamic balancing.