Without disassembling the generator, use a multimeter to measure the resistance between the terminals of the generator to initially determine whether the generator is faulty. The method is: use the multimeter RxI level to test the resistance value between the generator "F'' (magnetic field) and "one" (ground), as well as the generator "+" (armature) and "one" (ground) The forward and reverse resistance values between "F" and "-" meet the relevant regulations under normal circumstances. If the resistance between "F" and "-" exceeds the specified value, it means that the contact between the brush and the collecting ring is poor; if it is less than When the resistance is 0, it means there is a short circuit between the two collector rings or the "F" terminal is grounded. Connect the "-" test rod of the multimeter to the generator casing, and connect the "+" test rod to the "+" terminal of the generator. If the multimeter points between 40 and 50f, it means that the diode is normal. If the multimeter indicates a value around ion, it means that individual diodes have broken down and short-circuited. If the resistance value indicated by the multimeter is close to 0 or equal to 0, it means that both the diode installed on the end cover and the diode installed on the component board have breakdown and short-circuited tubes. However, if the diode is open internally, it cannot be detected externally with a multimeter, and the generator must be disassembled and inspected one by one.
Construction steps of generator rotor Generator rotor
The deformation of the fan blades on the turbine generator rotor will have the following effects on the generator.
1. The motor cooling fan blades are broken, and the motor cannot dissipate effective heat. The temperature rise increases, the motor becomes hot, and the insulation aging in the stator is accelerated.
2. If the fan blades are partially damaged, it will cause unbalanced operation, the motor will vibrate, and the stability of the machine base will be damaged.
Construction steps of generator rotor
1. Inspection before pumping out the rotor of the generator
1.1 Check that the upper end covers and upper tiles on both sides of the generator have been removed, and the lower tiles of the lower end cover have been replaced with rotor brackets.
1.2 Check that the blades on both sides of the generator rotor have been removed.
1.3 Check that the steam gap baffles on both sides of the generator stator have been removed.
1.4 Check that the back wheels of the generator rotor and the steam turbine rotor have been disengaged, and the rotor has moved about 25.4mm to the exciting side.
1.5 Check that the vane ring related to the fan nozzle on the excitation side has been removed.
1.6 Check that the rotor magnetic pole center (large tooth) is in the vertical centerline position.
1.7 Check that the rotor traction tool on the generator excitation side shaft head has been installed.
1.8 Check that the rotor on the steam side of the generator is supported on the rotor bracket and that the journal is well protected.
1.9 Check that the rotor on the excitation side of the generator is supported on the rotor bracket and that the journal is well protected.
1.10 Check that the skateboard has been waxed and is clean and free of debris.
1.11 Check that the slider has been waxed, clean and free of debris, and tied firmly.
1.12 Check that the No. 8 wire through the rope has been tied with plastic tape and is smooth and free of burrs.
1.15 Check that the arc-shaped sleepers on both sides to pre-place the rotors are ready, and check that the copper sheets and cardboard used to wrap the generator rotor are ready.
1.16 Check that the rubber pad (stator core protection tool) placed under the sliding plate is ready and covers the end of the stator.
1.17 Check that the slider at the generator steam side journal has been fixed, the journal surface is well protected, and it is facing upwards.
2. Pull out the generator rotor
2.1 Use two cranes to lift the rotor at the same time. After adjusting the rotor to the level and even clearance around it, remove the rotor brackets on both sides of the generator. The two trucks should walk toward the power side at the same time. The driving should be smooth and slow, and the maintenance personnel should be notified to monitor the generator back wheel to prevent collision with the back wheel shell, so that the power side rotor guard ring can smoothly retreat into the iron core, and wait until the rotor steam side journal is supported. After the block enters the steam side inner end cover, turn the journal support block 180 degrees, face it directly downwards, and tighten it firmly.
2.2 When driving on the excitation side, slightly raise the rotor, and use the prepared No. 8 wire to pass through the nylon rope of the stator core protection tool from the excitation side to protect the stator core. Slowly pull the tool and the sliding plate from the gap between the stator and the rotor. Carefully check the stator core protection tool to confirm that no fragments have been torn off or detached from the core.
2.3 Install the slider from the excitation side, use a rope to pull the slider to a distance of 100mm from the inner edge of the steam side guard ring, and drive Panasonic #1 to make the rotor slide. The block is stressed. At this time, check that the large teeth of the generator rotor rest on the slider, and use a spirit level to check the level of the rotor.
2.4 Use wooden boards to support the skateboard on the lower outer end cover of the excitation side to prevent the skateboard from moving to the excitation side.
2.5 Use a wire rope to connect one end of the two five-ton hoists to the traction tool, and the other end to the special wire rope for pulling out the rotor, and tighten them.
2.6 Under the unified command of the lifting personnel, use the #2 crane to lift the rotor, and use two five-ton hoists to pull the rotor to the exciting side at the same time. , Electrical personnel closely monitor the stator and rotor clearances on both sides of the steam and excitation to prevent friction and collision. When obvious changes in the gap are found, report to the commander immediately and stop towing.
2.7 When the steam side backrest enters the stator chamber and has passed the third stepped wedge, the vehicle should stop running. Lower the #2 traveling hook slightly so that the rotor steam side journal support block rests on the sliding plate and bears force; continue to use the reverse chain to pull the rotor. Slide block inside the retaining ringAfter approaching the step section of the core on the exciting side of the stator, #2 crane slightly lifts the hook and takes out the inner slider of the retaining ring from the exciting side. (Note: Do not allow the stepped core section to be stressed).
2.8 Adjust the rotor to the horizontal position and continue to pump out the rotor. When the rotor is extracted four-fifths (the B pair of pulleys must not strain on the trapezoid), the center of gravity of the rotor can be around When the nylon rope is in position, slowly place the rotor exciting side journal on the wooden square bracket.
2.9 Wrap cardboard to protect the center of gravity of the rotor, wrap a nylon rope around it, and perform length and center leveling.
2.10 Command #2 to lift the rotor slightly and check whether the lifting center of gravity is correct. After adjusting the level of the rotor, take away the side support wood of the rotor and use #2 to drive. Pull out the rotor.
2.11 Lift the rotor onto the prepared arc sleepers.
2. 12 Panasonic #2 drives, the entire rotor extraction work is completed, and the rotor is covered with the canvas prepared in advance.