I don't know much about this, but I found the following information: 5.3 rotor overhaul process requirements 5.3. 1 rotor hanging out and hanging in 5.3.1./rotor hanging out should meet the conditions: a) there are no parts on the upper part of the rotor to prevent the rotor from hanging out, and all electrical leads have been disconnected. B) The air gap of the generator has been checked and determined. C) Bolts and pins connecting thrust head and rotor center body have been removed. D) Jack up the rotor, lock the brake and put it on the brake. The jacking height of the rotor depends on the disconnection of the spindle flange or the connection stop between the spindle and the central body. E) Put a wedge-shaped plate between the lower ring of the runner and the foundation ring, tighten it symmetrically with a hammer, and spot weld it firmly with the fixed part. L) Dismantle the connecting bolt between the steam turbine and generator or the connecting bolt between the rotor center and the shaft of the steam turbine. Pull out the side keys on both sides of the one-character key. G) The electrical and mechanical equipment of the bridge crane for lifting the rotor has been thoroughly inspected and tested, and the operation is reliable. H) Check the auxiliary power supply to ensure reliable power supply. I) The lifting rotor shaft is firmly connected with the balance beam, and the balance beam is horizontally adjusted within the range of 0.3mm/m/m ... j) Prepare the maintenance site for placing the rotor: clean and polish the bottom plate supporting the rotor in the installation room; Check that there are no cracks and serious defects in the reinforced concrete load-bearing beam and cover plate, and that the load-bearing cover plate is in good contact with the pier and uniformly stressed; Arrange the pier, and adjust the elevation of the wedge plate above the pier within the range of1mm. The rotor pit has been cleaned. Connect the special tool for assembling the crane rotor. 5.3. 1.2 The main procedures in the process of hoisting the rotor are as follows: a) hoisting the rotor 100 mm ~ 150 mm, and staying 10min. If necessary, measure the disturbance of the main beam of the bridge crane and check the level of the balance beam. Carry out the landing braking test of the bridge crane, and check the disturbance value of the bridge crane and the braking of the main hook. B) During the lifting process of the bridge crane, special electromechanical personnel shall be provided to monitor and inspect the brakes, reducers, drum wire ropes and their fixtures, and electrical equipment, so as to find faults in time and prevent accidents. C) When lifting the rotor in the stator, set a special wooden board (made according to the height of the stator core, the width of the magnetic poles and the size of the stator air gap) along every two magnetic poles of the stator circumference, insert it into the palm surface of the rotor pole and the stator air gap, and shake it constantly; When the board is stuck, stop lifting the rotor, and then lift it after centering. D) After the rotor is hoisted out, the generator shaft flange, the lower joint surface of the rotor center body and the bolt holes shall be cleaned and derusted in time, and painted with vaseline or butter to prevent corrosion. E) The lifting height of the rotor must exceed the highest point 200mm along the way, and it must walk at a constant speed according to the specified route until the installation site, and it is not allowed to stop halfway without exception. 5.3. 1.3 Requirements for hoisting the rotor: a) Before hoisting the rotor, all parts of the hydraulic turbine and generator that affect the hoisting lower part shall be hoisted in place and installed. B) After the brake is installed, the elevation deviation of the top surface of the brake shoe should not exceed 65438±0mm, and the clearance deviation with the rotor brake ring should be within 20% of the design value. C) After the connection between the thrust head and the mirror plate is completed, leveling falls on the thrust tile. D) Clean and repair the connecting flanges, bolt holes, notches, joint surfaces and keyways. E) Adjust the flange of the main shaft of the hydraulic turbine horizontally to 0. 10mm/m/m, and clean it by polishing. F) Check the balance beam and bridge crane in good condition. G) check and clean the generator stator and rotor, and paint them qualified. 5.3. 1.4 The main processes in the rotor hoisting process are as follows: a) The rotor hoisting steps are opposite to the hoisting steps. B) After the rotor is lifted, move it to the top of the machine pit, and when it falls to about 20mm away from the stator, calibrate the center once. C) Adjust the direction to ensure that the deviation between the center of generator shaft or rotor and the center of turbine shaft is less than 0.5mm. d) When the rotor brake ring is about10mm away from the top surface of the brake, align the large shaft flange or rotor center with the turbine shaft flange. Install 2 ~ 4 bolts symmetrically, and then drop the rotor on the brake. Check the center and level of the rotor. E) After the generator air gap is qualified, the connecting shaft and all connecting bolts shall be tightened according to the process requirements. 5.3.2 Maintenance of mechanical parts 5.3.2. 1 Inspection of the rotor in the machine pit shall meet the following requirements: a) Check the welding seam of the rotor structure to ensure that all bolts are well spot-welded without looseness. B) There shall be no cracks and open welding in the weld seam of rotor windshield, and no cracks in the fan. C) There is no looseness in the magnetic pole key and yoke key, and there is no crack in spot welding. 5.3.2.2's procedures for dismantling machine pit poles are as follows: a) Prepare dismantling tools. B) Remove the magnetic pole key spot welding, and remove the damping ring and the soft joint of the magnetic pole winding connecting wire. C) Put iron piers, jacks and wooden blocks under the corresponding poles to support the poles. D) Clamp the big end of the magnetic pole key with the spoon extractor hanging on the hook of the bridge crane, then find the vertical position of the hook of the bridge crane and pull out the magnetic pole key. E) After all the magnetic pole keys to be pulled out are pulled out, cover the upper and lower ends of the magnetic pole with U-shaped protective caps with felt pads, tie them with steel ropes, and lift the magnetic pole out. F) During hoisting, the magnetic poles shall not collide with the stator. G) Pull out the magnetic pole key and keep it in the serial number. Check and repair it before reassembly. The technological requirements for magnetic pole reassembly in 5.3.2.3 machine pit are as follows: a) Before magnetic pole reassembly, check whether the T-shaped tail of magnetic pole is straight and clean, and whether there are sundries in the T-shaped keyway of yoke, and clean it up. B) Place the jack and special pad iron at the lower part of the corresponding magnetic pole. C) First, put two short keys on both sides of the T-shaped tail of the yoke according to the logo. Pay attention to the fact that the big head of the key is facing down, the inclined plane is facing the shaft, and the lower head of the key falls on the special pad iron. D) Hoist the magnetic pole with the hook of the bridge crane, align it, and then descend along the N-shaped groove until it is higher than the surrounding magnetic pole 1mm, and adjust the height of the magnetic pole. E) Evenly coat a layer of lubricant on the inclined surfaces of the two long keys, press down the inclined surfaces and insert them into the corresponding numbered keyways in the axial direction. After hitting people, their mating surfaces are in good contact and cannot be shaken by hand. F) The striking depth of the magnetic pole key should not be less than 90% of the height of the magnetic pole core. G) For the convenience of key pulling in the future, the length of the upper end of the magnetic pole key is about 200 mm.. The key head exposed at the lower part of the magnetic pole is cut flush with the bottom surface of the magnetic pole core. H) The relative height difference between the magnetic pole and adjacent magnetic poles measured at the damping ring shall not exceed1mm.. I) lap weld the magnetic pole key and connect the damping ring and the connecting joint of the magnetic pole winding in turn. J) Pay attention to the newly replaced magnetic pole counterweight. 5.3.2.4 rotor should be cleaned and inspected after it is hoisted out. After overhaul, the following requirements shall be met: a) The welding seam of rotor structure and the spot welding of each connecting bolt shall be intact, without cracks and looseness. There shall be no cracks and open welding at the windshield of the rotor and all welds, and the fan shall be free of cracks. B) There is no crack in the brake ring, and the bolt head for fixing the brake ring should be 2 mm ~ 3 mm below the braking surface of the brake ring. The staggered teeth at the joint of the brake ring should not be greater than1mm. There should be no gap between the joint surfaces of the wheel arm and the central body. C) There is no looseness in the magnetic pole key and yoke key, and there is no crack in spot welding. D) There is no foreign body in the rotor ventilation ditch and other hidden parts. E) paint quality meets the requirements. 5.3.2.5 rotor roundness can be measured by a circular measuring frame, which should meet the following requirements: a) The circular measuring frame itself has good rigidity, and the error of repeated measurement of any point on the circumference by the rotating arm of the center frame is not greater than 0.65438±0mm B) The measuring point should be located on the central axis of the palm surface of each pole, the paint on the surface of the measuring point should be removed, and the circular measuring frame should always rotate smoothly during measurement. C) The measuring part shall have an upper part and a lower part. Check the roundness of rotor poles, and the difference between each radius and the average radius should not be greater than 5% of the design air gap value. In the process of 5.3.2.6 rotor circle measurement, a circle measuring frame can be used to check the height deviation of magnetic poles, which should meet the following requirements: a) The magnetic poles with iron core length less than or equal to 1.5m should not be greater than1.0mm; ; The magnetic pole with iron core length greater than 1.5m should not be greater than 2.0mm. B) For generator rotors with rated speed of 300 r/min or above, the installation height difference of magnetic poles in symmetrical direction should not be greater than1.5mm.5.3.3 Maintenance of electrical parts 5.3.3. 1 Rotor magnetic poles and magnetic pole joints should meet the requirements after inspection and treatment. The withstand voltage data of main insulation is qualified. B) The magnetic pole joint is completely insulated and bandaged. C) No looseness, fracture and open welding of the magnetic pole joint. The screw connecting the tie rod and the insulating splint shall be intact. The fixing bolts of bolted magnetic pole joints shall be tightened and the locking pieces shall be locked. 5.3.3.2 damping ring and its joint shall meet the following requirements after overhaul: a) The damping ring and damping bar are well connected without fracture and welding. Bolts should be tightened and locking plates should be locked. B) The damping ring and its flexible joint shall be free of cracks, deformation, fragments and loose bolts. C) Damping bars shall be free from cracks, looseness, wear and fracture. 5.3.3.3 rotor lead shall meet the following requirements after overhaul: a) Insulation shall be complete and good, free from damage and overheating. B) The lead wire is fixed in good condition, and the fixed splint is well insulated, fixed firmly and free from looseness. 5.3.3.4 slip ring and excitation lead shall meet the following requirements after overhaul: a) the surface of slip ring shall be smooth without pits, brush marks or grooves, and the surface roughness shall not be greater than 0.5 mm..b b) the negative electrode of slip ring wears rapidly in operation, and the polarities of two slip rings shall be changed if necessary. C) Brush grip and brush grip insulating prop shall be intact and fixed firmly. The clearance between the brush grip and the slip ring surface should be 3-4 mm. The brush holder should be vertically aligned with the elastic slip ring. D) the brush is in good contact with the slip ring. There should be a gap of 0. 1 mm ~ 0.2 mm between the brush and the brush box wall. E) The brush pressure should be adjusted within the range of 0. 15 MPa ~ 0.25 MPa, and the pressure difference of each brush on the same brush should not exceed 10%. F) The brand of the new brush must be the same as that of the original brush. G) excitation lead and cable insulation should be intact without damage, joint connection is firm, and the fixed splint is intact. The main process of rotor painting in 5.3.3.5 overhaul should meet the following requirements: a) All mechanical and electrical maintenance work is finished. B) Clean the rotor before painting, and then purge it with clean and dry compressed air. C) Check whether all bolts are fastened and whether the locking plate is locked. D) AC withstand voltage of pole winding is qualified. E) It is advisable to adjust the toluene used in1361(1321) to 8 ~ 10 drops per second. F) Spray paint evenly without sagging. G) After the paint is dried, the magnetic poles shall be marked according to the original number. When one of the following defects is found, the 5.3.3.6 magnetic pole should be disassembled, overhauled or replaced: a) the main insulation is poor. B) winding turn-to-turn short circuit. C) Replace or re-rivet the winding joint. The main steps of 5.3.3.7 magnetic pole disassembly and maintenance are as follows: a) Remove the clamp bolt. B) welding the magnetic pole welding head. C) Lift and pull the magnetic pole. D) winding and core decomposition. E) iron core and winding cleaning inspection. F) Repair main insulation, turn-to-turn insulation or riveting points. G) winding and core assembly. The main steps of 5.3.3.8 magnetic pole winding assembly are as follows: a) Check whether all parts of the winding and iron core are abnormal. B) Wrap the iron core on the winding with special tools. C) Adjust the winding height, pole winding height and backing plate. In the compressed state, the height difference between the backing plate and the iron core should meet the design requirements, and should not exceed -lmm if there is no regulation. D) Insert epoxy glass cloth between the winding and the iron core, and wedge the winding with a wedge. E) pole drying (if necessary). F) Measure the insulation resistance of a single magnetic pole not less than 5mΩ. G) AC withstand voltage test is qualified. When the following defects are found, the 5.3.3.9 magnetic pole joint should be replaced: a) The copper sheet of the soft joint is broken. B) The damaged soft joint reduces the conductive cross section by more than 15%, and cracks are found in the weld. C) the copper sheet loses its elasticity. D) The riveting welding between the soft joint and the magnetic pole winding is poor. E) The contact resistance of the soft joint is unqualified. 5.3.3. 10 The main procedures for replacing the magnetic pole connector are: a) Dismantle the upper and lower damping ring connectors (when the magnetic pole needs to be hoisted out). B) Dismantle the fixing splint of the magnetic pole soft joint and remove the insulation of the package. C) Remove the magnetic pole flexible connector. D) Clean and form the soft joint. E) Connect the magnetic pole soft connector, wrap it with insulation, and attach a fixing splint. F) Install the damping ring soft joint. G) measure the contact resistance. 5.3.3. 1 1 The connection of the magnetic pole joint shall meet the following requirements: a) The dislocation of the joint shall not exceed 10% of the joint width, and the current density of the contact surface shall meet the design requirements. B) The welded joint shall be full, smooth and elastic. C) Insulation bandaging of joints shall meet the design requirements. The safe distance between the connector and the grounding conductor shall not be less than 10mm. After the insulation splint is fastened, there should be a gap of lmm ~ 2mm between the ends of the two splints.